drm: Nuke ->vblank_disable_allowed

Submitted by Daniel Vetter on May 18, 2016, 7:47 p.m.

Details

Message ID 1463600858-22218-1-git-send-email-daniel.vetter@ffwll.ch
State New
Headers show
Series "drm: Nuke ->vblank_disable_allowed" ( rev: 1 ) in Intel GFX

Not browsing as part of any series.

Commit Message

Daniel Vetter May 18, 2016, 7:47 p.m.
This was added in

commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Tue Sep 30 12:14:26 2008 -0700

    drm: Rework vblank-wait handling to allow interrupt reduction.

to stay backwards-compatible with old UMS code that didn't even tell
the kernel when it did a modeset, so that the kernel could
save/restore vblank counters. At worst this means vblanks will be
somewhat funky on a setup that very likely no one still runs.

So let's just nuke it.

Plan B would be to set it unconditionally in drm_vblank_init for kms
drivers, instead of in each driver separately. So if this patch breaks
anything please only restore the hunks in drmP.h and drm_irq.c, plus
add a check for DRIVER_MODESET in drm_vblank_init.

Stumbled over this in a discussion on irc with Chris.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c     | 1 -
 drivers/gpu/drm/arm/hdlcd_drv.c             | 1 -
 drivers/gpu/drm/armada/armada_drv.c         | 1 -
 drivers/gpu/drm/drm_irq.c                   | 6 ------
 drivers/gpu/drm/exynos/exynos_drm_drv.c     | 7 -------
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c   | 1 -
 drivers/gpu/drm/gma500/psb_drv.c            | 1 -
 drivers/gpu/drm/i915/i915_dma.c             | 3 ---
 drivers/gpu/drm/i915/intel_psr.c            | 3 +++
 drivers/gpu/drm/imx/imx-drm-core.c          | 7 -------
 drivers/gpu/drm/radeon/radeon_irq_kms.c     | 1 -
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 7 -------
 drivers/gpu/drm/tegra/drm.c                 | 1 -
 drivers/gpu/drm/vc4/vc4_kms.c               | 2 --
 include/drm/drmP.h                          | 8 --------
 15 files changed, 3 insertions(+), 47 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 9266c7b69808..835a3fa8d8df 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -219,7 +219,6 @@  int amdgpu_irq_init(struct amdgpu_device *adev)
 	if (r) {
 		return r;
 	}
-	adev->ddev->vblank_disable_allowed = true;
 
 	/* enable msi */
 	adev->irq.msi_enabled = false;
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index 2112f0b105e3..4f909378d581 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -379,7 +379,6 @@  static int hdlcd_drm_bind(struct device *dev)
 		DRM_ERROR("failed to initialise vblank\n");
 		goto err_vblank;
 	}
-	drm->vblank_disable_allowed = true;
 
 	drm_mode_config_reset(drm);
 	drm_kms_helper_poll_init(drm);
diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
index 531fcb946346..cb21c0b6374a 100644
--- a/drivers/gpu/drm/armada/armada_drv.c
+++ b/drivers/gpu/drm/armada/armada_drv.c
@@ -113,7 +113,6 @@  static int armada_drm_load(struct drm_device *dev, unsigned long flags)
 		goto err_comp;
 
 	dev->irq_enabled = true;
-	dev->vblank_disable_allowed = 1;
 
 	ret = armada_fbdev_init(dev);
 	if (ret)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index d1b5fc20b2f8..1a0ae89087e8 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -348,9 +348,6 @@  static void vblank_disable_fn(unsigned long arg)
 	unsigned int pipe = vblank->pipe;
 	unsigned long irqflags;
 
-	if (!dev->vblank_disable_allowed)
-		return;
-
 	spin_lock_irqsave(&dev->vbl_lock, irqflags);
 	if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
 		DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
@@ -437,8 +434,6 @@  int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
 			 "get_vblank_timestamp == NULL\n");
 	}
 
-	dev->vblank_disable_allowed = false;
-
 	return 0;
 
 err:
@@ -1555,7 +1550,6 @@  static void drm_legacy_vblank_post_modeset(struct drm_device *dev,
 
 	if (vblank->inmodeset) {
 		spin_lock_irqsave(&dev->vbl_lock, irqflags);
-		dev->vblank_disable_allowed = true;
 		drm_reset_vblank_timestamp(dev, pipe);
 		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 21c719e8e02b..2dd820e23b0c 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -212,13 +212,6 @@  static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
 	 */
 	dev->irq_enabled = true;
 
-	/*
-	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
-	 * by drm timer once a current process gives up ownership of
-	 * vblank event.(after drm_vblank_put function is called)
-	 */
-	dev->vblank_disable_allowed = true;
-
 	/* init kms poll for handling hpd */
 	drm_kms_helper_poll_init(dev);
 
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 2e58dfd74ae1..33727d5d826a 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -80,7 +80,6 @@  static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
 		dev_err(dev->dev, "failed to initialize vblank\n");
 		goto done;
 	}
-	dev->vblank_disable_allowed = true;
 
 	ret = fsl_dcu_drm_irq_init(dev);
 	if (ret < 0)
diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
index 4e1c6850520e..82b8ce418b27 100644
--- a/drivers/gpu/drm/gma500/psb_drv.c
+++ b/drivers/gpu/drm/gma500/psb_drv.c
@@ -374,7 +374,6 @@  static int psb_driver_load(struct drm_device *dev, unsigned long flags)
 
 	drm_irq_install(dev, dev->pdev->irq);
 
-	dev->vblank_disable_allowed = true;
 	dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
 	dev->driver->get_vblank_counter = psb_get_vblank_counter;
 
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a8c79f6512a4..fd06bff216ff 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -515,9 +515,6 @@  static int i915_load_modeset_init(struct drm_device *dev)
 
 	intel_modeset_gem_init(dev);
 
-	/* Always safe in the mode setting case. */
-	/* FIXME: do pre/post-mode set stuff in core KMS code */
-	dev->vblank_disable_allowed = true;
 	if (INTEL_INFO(dev)->num_pipes == 0)
 		return 0;
 
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index f9ce47135bb4..02fc5871b5b7 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -274,6 +274,9 @@  static void hsw_psr_enable_source(struct intel_dp *intel_dp)
 	if (dev_priv->psr.link_standby)
 		val |= EDP_PSR_LINK_STANDBY;
 
+	printk("tp1 wakupe time %i\n", dev_priv->vbt.psr.tp1_wakeup_time);
+	printk("tp2/3 wakupe time %i\n", dev_priv->vbt.psr.tp2_tp3_wakeup_time);
+
 	if (dev_priv->vbt.psr.tp1_wakeup_time > 5)
 		val |= EDP_PSR_TP1_TIME_2500us;
 	else if (dev_priv->vbt.psr.tp1_wakeup_time > 1)
diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index 2453fb1c68a7..1080019e7b17 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -252,13 +252,6 @@  static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 	if (ret)
 		goto err_kms;
 
-	/*
-	 * with vblank_disable_allowed = true, vblank interrupt will be
-	 * disabled by drm timer once a current process gives up ownership
-	 * of vblank event. (after drm_vblank_put function is called)
-	 */
-	drm->vblank_disable_allowed = true;
-
 	platform_set_drvdata(drm->platformdev, drm);
 
 	/* Now try and bind all our sub-components */
diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 1e9304d1c88f..c084cadcbf21 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -291,7 +291,6 @@  int radeon_irq_kms_init(struct radeon_device *rdev)
 	if (r) {
 		return r;
 	}
-	rdev->ddev->vblank_disable_allowed = true;
 
 	/* enable msi */
 	rdev->msi_enabled = 0;
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index ced1e5f93cda..09a4d429c0f0 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -217,13 +217,6 @@  static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
 	if (ret)
 		goto err_kms_helper_poll_fini;
 
-	/*
-	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
-	 * by drm timer once a current process gives up ownership of
-	 * vblank event.(after drm_vblank_put function is called)
-	 */
-	drm_dev->vblank_disable_allowed = true;
-
 	drm_mode_config_reset(drm_dev);
 
 	ret = rockchip_drm_fbdev_init(drm_dev);
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 679905544181..b59c3bf0df44 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -180,7 +180,6 @@  static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
 
 	/* syncpoints are used for full 32-bit hardware VBLANK counters */
 	drm->max_vblank_count = 0xffffffff;
-	drm->vblank_disable_allowed = true;
 
 	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
 	if (err < 0)
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index d423ba10239a..cb37751bc99f 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -207,8 +207,6 @@  int vc4_kms_load(struct drm_device *dev)
 	dev->mode_config.preferred_depth = 24;
 	dev->mode_config.async_page_flip = true;
 
-	dev->vblank_disable_allowed = true;
-
 	drm_mode_config_reset(dev);
 
 	vc4->fbdev = drm_fbdev_cma_init(dev, 32,
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index f0d1450d4ea5..30dc7d8c403f 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -819,14 +819,6 @@  struct drm_device {
 	int irq;
 
 	/*
-	 * At load time, disabling the vblank interrupt won't be allowed since
-	 * old clients may not call the modeset ioctl and therefore misbehave.
-	 * Once the modeset ioctl *has* been called though, we can safely
-	 * disable them when unused.
-	 */
-	bool vblank_disable_allowed;
-
-	/*
 	 * If true, vblank interrupt will be disabled immediately when the
 	 * refcount drops to zero, as opposed to via the vblank disable
 	 * timer.

Comments

On Wed, May 18, 2016 at 3:47 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> This was added in
>
> commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
> Author: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date:   Tue Sep 30 12:14:26 2008 -0700
>
>     drm: Rework vblank-wait handling to allow interrupt reduction.
>
> to stay backwards-compatible with old UMS code that didn't even tell
> the kernel when it did a modeset, so that the kernel could
> save/restore vblank counters. At worst this means vblanks will be
> somewhat funky on a setup that very likely no one still runs.
>
> So let's just nuke it.
>
> Plan B would be to set it unconditionally in drm_vblank_init for kms
> drivers, instead of in each driver separately. So if this patch breaks
> anything please only restore the hunks in drmP.h and drm_irq.c, plus
> add a check for DRIVER_MODESET in drm_vblank_init.
>
> Stumbled over this in a discussion on irc with Chris.
>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Russell King <rmk+kernel@arm.linux.org.uk>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Cc: Inki Dae <inki.dae@samsung.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Cc: Mark Yao <mark.yao@rock-chips.com>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c     | 1 -
>  drivers/gpu/drm/arm/hdlcd_drv.c             | 1 -
>  drivers/gpu/drm/armada/armada_drv.c         | 1 -
>  drivers/gpu/drm/drm_irq.c                   | 6 ------
>  drivers/gpu/drm/exynos/exynos_drm_drv.c     | 7 -------
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c   | 1 -
>  drivers/gpu/drm/gma500/psb_drv.c            | 1 -
>  drivers/gpu/drm/i915/i915_dma.c             | 3 ---
>  drivers/gpu/drm/i915/intel_psr.c            | 3 +++
>  drivers/gpu/drm/imx/imx-drm-core.c          | 7 -------
>  drivers/gpu/drm/radeon/radeon_irq_kms.c     | 1 -
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 7 -------
>  drivers/gpu/drm/tegra/drm.c                 | 1 -
>  drivers/gpu/drm/vc4/vc4_kms.c               | 2 --
>  include/drm/drmP.h                          | 8 --------
>  15 files changed, 3 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index 9266c7b69808..835a3fa8d8df 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -219,7 +219,6 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>         if (r) {
>                 return r;
>         }
> -       adev->ddev->vblank_disable_allowed = true;
>
>         /* enable msi */
>         adev->irq.msi_enabled = false;
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index 2112f0b105e3..4f909378d581 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -379,7 +379,6 @@ static int hdlcd_drm_bind(struct device *dev)
>                 DRM_ERROR("failed to initialise vblank\n");
>                 goto err_vblank;
>         }
> -       drm->vblank_disable_allowed = true;
>
>         drm_mode_config_reset(drm);
>         drm_kms_helper_poll_init(drm);
> diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
> index 531fcb946346..cb21c0b6374a 100644
> --- a/drivers/gpu/drm/armada/armada_drv.c
> +++ b/drivers/gpu/drm/armada/armada_drv.c
> @@ -113,7 +113,6 @@ static int armada_drm_load(struct drm_device *dev, unsigned long flags)
>                 goto err_comp;
>
>         dev->irq_enabled = true;
> -       dev->vblank_disable_allowed = 1;
>
>         ret = armada_fbdev_init(dev);
>         if (ret)
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index d1b5fc20b2f8..1a0ae89087e8 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -348,9 +348,6 @@ static void vblank_disable_fn(unsigned long arg)
>         unsigned int pipe = vblank->pipe;
>         unsigned long irqflags;
>
> -       if (!dev->vblank_disable_allowed)
> -               return;
> -
>         spin_lock_irqsave(&dev->vbl_lock, irqflags);
>         if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
>                 DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
> @@ -437,8 +434,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
>                          "get_vblank_timestamp == NULL\n");
>         }
>
> -       dev->vblank_disable_allowed = false;
> -
>         return 0;
>
>  err:
> @@ -1555,7 +1550,6 @@ static void drm_legacy_vblank_post_modeset(struct drm_device *dev,
>
>         if (vblank->inmodeset) {
>                 spin_lock_irqsave(&dev->vbl_lock, irqflags);
> -               dev->vblank_disable_allowed = true;
>                 drm_reset_vblank_timestamp(dev, pipe);
>                 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> index 21c719e8e02b..2dd820e23b0c 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -212,13 +212,6 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
>          */
>         dev->irq_enabled = true;
>
> -       /*
> -        * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -        * by drm timer once a current process gives up ownership of
> -        * vblank event.(after drm_vblank_put function is called)
> -        */
> -       dev->vblank_disable_allowed = true;
> -
>         /* init kms poll for handling hpd */
>         drm_kms_helper_poll_init(dev);
>
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> index 2e58dfd74ae1..33727d5d826a 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -80,7 +80,6 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
>                 dev_err(dev->dev, "failed to initialize vblank\n");
>                 goto done;
>         }
> -       dev->vblank_disable_allowed = true;
>
>         ret = fsl_dcu_drm_irq_init(dev);
>         if (ret < 0)
> diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
> index 4e1c6850520e..82b8ce418b27 100644
> --- a/drivers/gpu/drm/gma500/psb_drv.c
> +++ b/drivers/gpu/drm/gma500/psb_drv.c
> @@ -374,7 +374,6 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
>
>         drm_irq_install(dev, dev->pdev->irq);
>
> -       dev->vblank_disable_allowed = true;
>         dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
>         dev->driver->get_vblank_counter = psb_get_vblank_counter;
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index a8c79f6512a4..fd06bff216ff 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -515,9 +515,6 @@ static int i915_load_modeset_init(struct drm_device *dev)
>
>         intel_modeset_gem_init(dev);
>
> -       /* Always safe in the mode setting case. */
> -       /* FIXME: do pre/post-mode set stuff in core KMS code */
> -       dev->vblank_disable_allowed = true;
>         if (INTEL_INFO(dev)->num_pipes == 0)
>                 return 0;
>
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index f9ce47135bb4..02fc5871b5b7 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -274,6 +274,9 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp)
>         if (dev_priv->psr.link_standby)
>                 val |= EDP_PSR_LINK_STANDBY;
>
> +       printk("tp1 wakupe time %i\n", dev_priv->vbt.psr.tp1_wakeup_time);
> +       printk("tp2/3 wakupe time %i\n", dev_priv->vbt.psr.tp2_tp3_wakeup_time);
> +

Some leftover debugging statements?

Alex
On Wed, May 18, 2016 at 4:29 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> This was added in
>
> commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
> Author: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date:   Tue Sep 30 12:14:26 2008 -0700
>
>     drm: Rework vblank-wait handling to allow interrupt reduction.
>
> to stay backwards-compatible with old UMS code that didn't even tell
> the kernel when it did a modeset, so that the kernel could
> save/restore vblank counters. At worst this means vblanks will be
> somewhat funky on a setup that very likely no one still runs.
>
> So let's just nuke it.
>
> Plan B would be to set it unconditionally in drm_vblank_init for kms
> drivers, instead of in each driver separately. So if this patch breaks
> anything please only restore the hunks in drmP.h and drm_irq.c, plus
> add a check for DRIVER_MODESET in drm_vblank_init.
>
> Stumbled over this in a discussion on irc with Chris.
>
> v2: Remove leftover debug gunk from psr hacking (Alex).
>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Russell King <rmk+kernel@arm.linux.org.uk>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Cc: Inki Dae <inki.dae@samsung.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Cc: Mark Yao <mark.yao@rock-chips.com>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

Seems reasonable to me.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c     | 1 -
>  drivers/gpu/drm/arm/hdlcd_drv.c             | 1 -
>  drivers/gpu/drm/armada/armada_drv.c         | 1 -
>  drivers/gpu/drm/drm_irq.c                   | 6 ------
>  drivers/gpu/drm/exynos/exynos_drm_drv.c     | 7 -------
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c   | 1 -
>  drivers/gpu/drm/gma500/psb_drv.c            | 1 -
>  drivers/gpu/drm/i915/i915_dma.c             | 3 ---
>  drivers/gpu/drm/imx/imx-drm-core.c          | 7 -------
>  drivers/gpu/drm/radeon/radeon_irq_kms.c     | 1 -
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 7 -------
>  drivers/gpu/drm/tegra/drm.c                 | 1 -
>  drivers/gpu/drm/vc4/vc4_kms.c               | 2 --
>  include/drm/drmP.h                          | 8 --------
>  14 files changed, 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index 9266c7b69808..835a3fa8d8df 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -219,7 +219,6 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>         if (r) {
>                 return r;
>         }
> -       adev->ddev->vblank_disable_allowed = true;
>
>         /* enable msi */
>         adev->irq.msi_enabled = false;
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index 2112f0b105e3..4f909378d581 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -379,7 +379,6 @@ static int hdlcd_drm_bind(struct device *dev)
>                 DRM_ERROR("failed to initialise vblank\n");
>                 goto err_vblank;
>         }
> -       drm->vblank_disable_allowed = true;
>
>         drm_mode_config_reset(drm);
>         drm_kms_helper_poll_init(drm);
> diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
> index 531fcb946346..cb21c0b6374a 100644
> --- a/drivers/gpu/drm/armada/armada_drv.c
> +++ b/drivers/gpu/drm/armada/armada_drv.c
> @@ -113,7 +113,6 @@ static int armada_drm_load(struct drm_device *dev, unsigned long flags)
>                 goto err_comp;
>
>         dev->irq_enabled = true;
> -       dev->vblank_disable_allowed = 1;
>
>         ret = armada_fbdev_init(dev);
>         if (ret)
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index d1b5fc20b2f8..1a0ae89087e8 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -348,9 +348,6 @@ static void vblank_disable_fn(unsigned long arg)
>         unsigned int pipe = vblank->pipe;
>         unsigned long irqflags;
>
> -       if (!dev->vblank_disable_allowed)
> -               return;
> -
>         spin_lock_irqsave(&dev->vbl_lock, irqflags);
>         if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
>                 DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
> @@ -437,8 +434,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
>                          "get_vblank_timestamp == NULL\n");
>         }
>
> -       dev->vblank_disable_allowed = false;
> -
>         return 0;
>
>  err:
> @@ -1555,7 +1550,6 @@ static void drm_legacy_vblank_post_modeset(struct drm_device *dev,
>
>         if (vblank->inmodeset) {
>                 spin_lock_irqsave(&dev->vbl_lock, irqflags);
> -               dev->vblank_disable_allowed = true;
>                 drm_reset_vblank_timestamp(dev, pipe);
>                 spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> index 21c719e8e02b..2dd820e23b0c 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -212,13 +212,6 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
>          */
>         dev->irq_enabled = true;
>
> -       /*
> -        * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -        * by drm timer once a current process gives up ownership of
> -        * vblank event.(after drm_vblank_put function is called)
> -        */
> -       dev->vblank_disable_allowed = true;
> -
>         /* init kms poll for handling hpd */
>         drm_kms_helper_poll_init(dev);
>
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> index 2e58dfd74ae1..33727d5d826a 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -80,7 +80,6 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
>                 dev_err(dev->dev, "failed to initialize vblank\n");
>                 goto done;
>         }
> -       dev->vblank_disable_allowed = true;
>
>         ret = fsl_dcu_drm_irq_init(dev);
>         if (ret < 0)
> diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
> index 4e1c6850520e..82b8ce418b27 100644
> --- a/drivers/gpu/drm/gma500/psb_drv.c
> +++ b/drivers/gpu/drm/gma500/psb_drv.c
> @@ -374,7 +374,6 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
>
>         drm_irq_install(dev, dev->pdev->irq);
>
> -       dev->vblank_disable_allowed = true;
>         dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
>         dev->driver->get_vblank_counter = psb_get_vblank_counter;
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index a8c79f6512a4..fd06bff216ff 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -515,9 +515,6 @@ static int i915_load_modeset_init(struct drm_device *dev)
>
>         intel_modeset_gem_init(dev);
>
> -       /* Always safe in the mode setting case. */
> -       /* FIXME: do pre/post-mode set stuff in core KMS code */
> -       dev->vblank_disable_allowed = true;
>         if (INTEL_INFO(dev)->num_pipes == 0)
>                 return 0;
>
> diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
> index 2453fb1c68a7..1080019e7b17 100644
> --- a/drivers/gpu/drm/imx/imx-drm-core.c
> +++ b/drivers/gpu/drm/imx/imx-drm-core.c
> @@ -252,13 +252,6 @@ static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
>         if (ret)
>                 goto err_kms;
>
> -       /*
> -        * with vblank_disable_allowed = true, vblank interrupt will be
> -        * disabled by drm timer once a current process gives up ownership
> -        * of vblank event. (after drm_vblank_put function is called)
> -        */
> -       drm->vblank_disable_allowed = true;
> -
>         platform_set_drvdata(drm->platformdev, drm);
>
>         /* Now try and bind all our sub-components */
> diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> index 1e9304d1c88f..c084cadcbf21 100644
> --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> @@ -291,7 +291,6 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
>         if (r) {
>                 return r;
>         }
> -       rdev->ddev->vblank_disable_allowed = true;
>
>         /* enable msi */
>         rdev->msi_enabled = 0;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index ced1e5f93cda..09a4d429c0f0 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -217,13 +217,6 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
>         if (ret)
>                 goto err_kms_helper_poll_fini;
>
> -       /*
> -        * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -        * by drm timer once a current process gives up ownership of
> -        * vblank event.(after drm_vblank_put function is called)
> -        */
> -       drm_dev->vblank_disable_allowed = true;
> -
>         drm_mode_config_reset(drm_dev);
>
>         ret = rockchip_drm_fbdev_init(drm_dev);
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 679905544181..b59c3bf0df44 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -180,7 +180,6 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
>
>         /* syncpoints are used for full 32-bit hardware VBLANK counters */
>         drm->max_vblank_count = 0xffffffff;
> -       drm->vblank_disable_allowed = true;
>
>         err = drm_vblank_init(drm, drm->mode_config.num_crtc);
>         if (err < 0)
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index d423ba10239a..cb37751bc99f 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -207,8 +207,6 @@ int vc4_kms_load(struct drm_device *dev)
>         dev->mode_config.preferred_depth = 24;
>         dev->mode_config.async_page_flip = true;
>
> -       dev->vblank_disable_allowed = true;
> -
>         drm_mode_config_reset(dev);
>
>         vc4->fbdev = drm_fbdev_cma_init(dev, 32,
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index f0d1450d4ea5..30dc7d8c403f 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -819,14 +819,6 @@ struct drm_device {
>         int irq;
>
>         /*
> -        * At load time, disabling the vblank interrupt won't be allowed since
> -        * old clients may not call the modeset ioctl and therefore misbehave.
> -        * Once the modeset ioctl *has* been called though, we can safely
> -        * disable them when unused.
> -        */
> -       bool vblank_disable_allowed;
> -
> -       /*
>          * If true, vblank interrupt will be disabled immediately when the
>          * refcount drops to zero, as opposed to via the vblank disable
>          * timer.
> --
> 2.8.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
On Wed, May 18, 2016 at 10:29:57PM +0200, Daniel Vetter wrote:
> This was added in
> 
> commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
> Author: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date:   Tue Sep 30 12:14:26 2008 -0700
> 
>     drm: Rework vblank-wait handling to allow interrupt reduction.
> 
> to stay backwards-compatible with old UMS code that didn't even tell
> the kernel when it did a modeset, so that the kernel could
> save/restore vblank counters. At worst this means vblanks will be
> somewhat funky on a setup that very likely no one still runs.
> 
> So let's just nuke it.
> 
> Plan B would be to set it unconditionally in drm_vblank_init for kms
> drivers, instead of in each driver separately. So if this patch breaks
> anything please only restore the hunks in drmP.h and drm_irq.c, plus
> add a check for DRIVER_MODESET in drm_vblank_init.
> 
> Stumbled over this in a discussion on irc with Chris.
> 
> v2: Remove leftover debug gunk from psr hacking (Alex).
> 
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Russell King <rmk+kernel@arm.linux.org.uk>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Cc: Inki Dae <inki.dae@samsung.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Cc: Mark Yao <mark.yao@rock-chips.com>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c     | 1 -
>  drivers/gpu/drm/arm/hdlcd_drv.c             | 1 -
>  drivers/gpu/drm/armada/armada_drv.c         | 1 -
>  drivers/gpu/drm/drm_irq.c                   | 6 ------
>  drivers/gpu/drm/exynos/exynos_drm_drv.c     | 7 -------
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c   | 1 -
>  drivers/gpu/drm/gma500/psb_drv.c            | 1 -
>  drivers/gpu/drm/i915/i915_dma.c             | 3 ---
>  drivers/gpu/drm/imx/imx-drm-core.c          | 7 -------
>  drivers/gpu/drm/radeon/radeon_irq_kms.c     | 1 -
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 7 -------
>  drivers/gpu/drm/tegra/drm.c                 | 1 -
>  drivers/gpu/drm/vc4/vc4_kms.c               | 2 --
>  include/drm/drmP.h                          | 8 --------
>  14 files changed, 47 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index 9266c7b69808..835a3fa8d8df 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -219,7 +219,6 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>  	if (r) {
>  		return r;
>  	}
> -	adev->ddev->vblank_disable_allowed = true;
>  
>  	/* enable msi */
>  	adev->irq.msi_enabled = false;
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index 2112f0b105e3..4f909378d581 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -379,7 +379,6 @@ static int hdlcd_drm_bind(struct device *dev)
>  		DRM_ERROR("failed to initialise vblank\n");
>  		goto err_vblank;
>  	}
> -	drm->vblank_disable_allowed = true;
>  
>  	drm_mode_config_reset(drm);
>  	drm_kms_helper_poll_init(drm);

For the hdlcd_drv.c part:

Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>

Thanks,
Liviu

> diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
> index 531fcb946346..cb21c0b6374a 100644
> --- a/drivers/gpu/drm/armada/armada_drv.c
> +++ b/drivers/gpu/drm/armada/armada_drv.c
> @@ -113,7 +113,6 @@ static int armada_drm_load(struct drm_device *dev, unsigned long flags)
>  		goto err_comp;
>  
>  	dev->irq_enabled = true;
> -	dev->vblank_disable_allowed = 1;
>  
>  	ret = armada_fbdev_init(dev);
>  	if (ret)
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index d1b5fc20b2f8..1a0ae89087e8 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -348,9 +348,6 @@ static void vblank_disable_fn(unsigned long arg)
>  	unsigned int pipe = vblank->pipe;
>  	unsigned long irqflags;
>  
> -	if (!dev->vblank_disable_allowed)
> -		return;
> -
>  	spin_lock_irqsave(&dev->vbl_lock, irqflags);
>  	if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
>  		DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
> @@ -437,8 +434,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs)
>  			 "get_vblank_timestamp == NULL\n");
>  	}
>  
> -	dev->vblank_disable_allowed = false;
> -
>  	return 0;
>  
>  err:
> @@ -1555,7 +1550,6 @@ static void drm_legacy_vblank_post_modeset(struct drm_device *dev,
>  
>  	if (vblank->inmodeset) {
>  		spin_lock_irqsave(&dev->vbl_lock, irqflags);
> -		dev->vblank_disable_allowed = true;
>  		drm_reset_vblank_timestamp(dev, pipe);
>  		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
>  
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> index 21c719e8e02b..2dd820e23b0c 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -212,13 +212,6 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
>  	 */
>  	dev->irq_enabled = true;
>  
> -	/*
> -	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -	 * by drm timer once a current process gives up ownership of
> -	 * vblank event.(after drm_vblank_put function is called)
> -	 */
> -	dev->vblank_disable_allowed = true;
> -
>  	/* init kms poll for handling hpd */
>  	drm_kms_helper_poll_init(dev);
>  
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> index 2e58dfd74ae1..33727d5d826a 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -80,7 +80,6 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
>  		dev_err(dev->dev, "failed to initialize vblank\n");
>  		goto done;
>  	}
> -	dev->vblank_disable_allowed = true;
>  
>  	ret = fsl_dcu_drm_irq_init(dev);
>  	if (ret < 0)
> diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
> index 4e1c6850520e..82b8ce418b27 100644
> --- a/drivers/gpu/drm/gma500/psb_drv.c
> +++ b/drivers/gpu/drm/gma500/psb_drv.c
> @@ -374,7 +374,6 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
>  
>  	drm_irq_install(dev, dev->pdev->irq);
>  
> -	dev->vblank_disable_allowed = true;
>  	dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
>  	dev->driver->get_vblank_counter = psb_get_vblank_counter;
>  
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index a8c79f6512a4..fd06bff216ff 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -515,9 +515,6 @@ static int i915_load_modeset_init(struct drm_device *dev)
>  
>  	intel_modeset_gem_init(dev);
>  
> -	/* Always safe in the mode setting case. */
> -	/* FIXME: do pre/post-mode set stuff in core KMS code */
> -	dev->vblank_disable_allowed = true;
>  	if (INTEL_INFO(dev)->num_pipes == 0)
>  		return 0;
>  
> diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
> index 2453fb1c68a7..1080019e7b17 100644
> --- a/drivers/gpu/drm/imx/imx-drm-core.c
> +++ b/drivers/gpu/drm/imx/imx-drm-core.c
> @@ -252,13 +252,6 @@ static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
>  	if (ret)
>  		goto err_kms;
>  
> -	/*
> -	 * with vblank_disable_allowed = true, vblank interrupt will be
> -	 * disabled by drm timer once a current process gives up ownership
> -	 * of vblank event. (after drm_vblank_put function is called)
> -	 */
> -	drm->vblank_disable_allowed = true;
> -
>  	platform_set_drvdata(drm->platformdev, drm);
>  
>  	/* Now try and bind all our sub-components */
> diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> index 1e9304d1c88f..c084cadcbf21 100644
> --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> @@ -291,7 +291,6 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
>  	if (r) {
>  		return r;
>  	}
> -	rdev->ddev->vblank_disable_allowed = true;
>  
>  	/* enable msi */
>  	rdev->msi_enabled = 0;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index ced1e5f93cda..09a4d429c0f0 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -217,13 +217,6 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
>  	if (ret)
>  		goto err_kms_helper_poll_fini;
>  
> -	/*
> -	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -	 * by drm timer once a current process gives up ownership of
> -	 * vblank event.(after drm_vblank_put function is called)
> -	 */
> -	drm_dev->vblank_disable_allowed = true;
> -
>  	drm_mode_config_reset(drm_dev);
>  
>  	ret = rockchip_drm_fbdev_init(drm_dev);
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 679905544181..b59c3bf0df44 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -180,7 +180,6 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
>  
>  	/* syncpoints are used for full 32-bit hardware VBLANK counters */
>  	drm->max_vblank_count = 0xffffffff;
> -	drm->vblank_disable_allowed = true;
>  
>  	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
>  	if (err < 0)
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index d423ba10239a..cb37751bc99f 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -207,8 +207,6 @@ int vc4_kms_load(struct drm_device *dev)
>  	dev->mode_config.preferred_depth = 24;
>  	dev->mode_config.async_page_flip = true;
>  
> -	dev->vblank_disable_allowed = true;
> -
>  	drm_mode_config_reset(dev);
>  
>  	vc4->fbdev = drm_fbdev_cma_init(dev, 32,
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index f0d1450d4ea5..30dc7d8c403f 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -819,14 +819,6 @@ struct drm_device {
>  	int irq;
>  
>  	/*
> -	 * At load time, disabling the vblank interrupt won't be allowed since
> -	 * old clients may not call the modeset ioctl and therefore misbehave.
> -	 * Once the modeset ioctl *has* been called though, we can safely
> -	 * disable them when unused.
> -	 */
> -	bool vblank_disable_allowed;
> -
> -	/*
>  	 * If true, vblank interrupt will be disabled immediately when the
>  	 * refcount drops to zero, as opposed to via the vblank disable
>  	 * timer.
> -- 
> 2.8.1
>
Hi Daniel,

Thank you for the patch.

On Wednesday 18 May 2016 22:29:57 Daniel Vetter wrote:
> This was added in
> 
> commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
> Author: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date:   Tue Sep 30 12:14:26 2008 -0700
> 
>     drm: Rework vblank-wait handling to allow interrupt reduction.
> 
> to stay backwards-compatible with old UMS code that didn't even tell
> the kernel when it did a modeset, so that the kernel could
> save/restore vblank counters. At worst this means vblanks will be
> somewhat funky on a setup that very likely no one still runs.
> 
> So let's just nuke it.
> 
> Plan B would be to set it unconditionally in drm_vblank_init for kms
> drivers, instead of in each driver separately. So if this patch breaks
> anything please only restore the hunks in drmP.h and drm_irq.c, plus
> add a check for DRIVER_MODESET in drm_vblank_init.
> 
> Stumbled over this in a discussion on irc with Chris.
> 
> v2: Remove leftover debug gunk from psr hacking (Alex).
> 
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Liviu Dudau <liviu.dudau@arm.com>
> Cc: Russell King <rmk+kernel@arm.linux.org.uk>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> Cc: Inki Dae <inki.dae@samsung.com>
> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Cc: Mark Yao <mark.yao@rock-chips.com>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

and for rcar-du-drm,

Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c     | 1 -
>  drivers/gpu/drm/arm/hdlcd_drv.c             | 1 -
>  drivers/gpu/drm/armada/armada_drv.c         | 1 -
>  drivers/gpu/drm/drm_irq.c                   | 6 ------
>  drivers/gpu/drm/exynos/exynos_drm_drv.c     | 7 -------
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c   | 1 -
>  drivers/gpu/drm/gma500/psb_drv.c            | 1 -
>  drivers/gpu/drm/i915/i915_dma.c             | 3 ---
>  drivers/gpu/drm/imx/imx-drm-core.c          | 7 -------
>  drivers/gpu/drm/radeon/radeon_irq_kms.c     | 1 -
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 7 -------
>  drivers/gpu/drm/tegra/drm.c                 | 1 -
>  drivers/gpu/drm/vc4/vc4_kms.c               | 2 --
>  include/drm/drmP.h                          | 8 --------
>  14 files changed, 47 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c index 9266c7b69808..835a3fa8d8df
> 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -219,7 +219,6 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
>  	if (r) {
>  		return r;
>  	}
> -	adev->ddev->vblank_disable_allowed = true;
> 
>  	/* enable msi */
>  	adev->irq.msi_enabled = false;
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c
> b/drivers/gpu/drm/arm/hdlcd_drv.c index 2112f0b105e3..4f909378d581 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -379,7 +379,6 @@ static int hdlcd_drm_bind(struct device *dev)
>  		DRM_ERROR("failed to initialise vblank\n");
>  		goto err_vblank;
>  	}
> -	drm->vblank_disable_allowed = true;
> 
>  	drm_mode_config_reset(drm);
>  	drm_kms_helper_poll_init(drm);
> diff --git a/drivers/gpu/drm/armada/armada_drv.c
> b/drivers/gpu/drm/armada/armada_drv.c index 531fcb946346..cb21c0b6374a
> 100644
> --- a/drivers/gpu/drm/armada/armada_drv.c
> +++ b/drivers/gpu/drm/armada/armada_drv.c
> @@ -113,7 +113,6 @@ static int armada_drm_load(struct drm_device *dev,
> unsigned long flags) goto err_comp;
> 
>  	dev->irq_enabled = true;
> -	dev->vblank_disable_allowed = 1;
> 
>  	ret = armada_fbdev_init(dev);
>  	if (ret)
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index d1b5fc20b2f8..1a0ae89087e8 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -348,9 +348,6 @@ static void vblank_disable_fn(unsigned long arg)
>  	unsigned int pipe = vblank->pipe;
>  	unsigned long irqflags;
> 
> -	if (!dev->vblank_disable_allowed)
> -		return;
> -
>  	spin_lock_irqsave(&dev->vbl_lock, irqflags);
>  	if (atomic_read(&vblank->refcount) == 0 && vblank->enabled) {
>  		DRM_DEBUG("disabling vblank on crtc %u\n", pipe);
> @@ -437,8 +434,6 @@ int drm_vblank_init(struct drm_device *dev, unsigned int
> num_crtcs) "get_vblank_timestamp == NULL\n");
>  	}
> 
> -	dev->vblank_disable_allowed = false;
> -
>  	return 0;
> 
>  err:
> @@ -1555,7 +1550,6 @@ static void drm_legacy_vblank_post_modeset(struct
> drm_device *dev,
> 
>  	if (vblank->inmodeset) {
>  		spin_lock_irqsave(&dev->vbl_lock, irqflags);
> -		dev->vblank_disable_allowed = true;
>  		drm_reset_vblank_timestamp(dev, pipe);
>  		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 21c719e8e02b..2dd820e23b0c
> 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -212,13 +212,6 @@ static int exynos_drm_load(struct drm_device *dev,
> unsigned long flags) */
>  	dev->irq_enabled = true;
> 
> -	/*
> -	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -	 * by drm timer once a current process gives up ownership of
> -	 * vblank event.(after drm_vblank_put function is called)
> -	 */
> -	dev->vblank_disable_allowed = true;
> -
>  	/* init kms poll for handling hpd */
>  	drm_kms_helper_poll_init(dev);
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c index
> 2e58dfd74ae1..33727d5d826a 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -80,7 +80,6 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned
> long flags) dev_err(dev->dev, "failed to initialize vblank\n");
>  		goto done;
>  	}
> -	dev->vblank_disable_allowed = true;
> 
>  	ret = fsl_dcu_drm_irq_init(dev);
>  	if (ret < 0)
> diff --git a/drivers/gpu/drm/gma500/psb_drv.c
> b/drivers/gpu/drm/gma500/psb_drv.c index 4e1c6850520e..82b8ce418b27 100644
> --- a/drivers/gpu/drm/gma500/psb_drv.c
> +++ b/drivers/gpu/drm/gma500/psb_drv.c
> @@ -374,7 +374,6 @@ static int psb_driver_load(struct drm_device *dev,
> unsigned long flags)
> 
>  	drm_irq_install(dev, dev->pdev->irq);
> 
> -	dev->vblank_disable_allowed = true;
>  	dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
>  	dev->driver->get_vblank_counter = psb_get_vblank_counter;
> 
> diff --git a/drivers/gpu/drm/i915/i915_dma.c
> b/drivers/gpu/drm/i915/i915_dma.c index a8c79f6512a4..fd06bff216ff 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -515,9 +515,6 @@ static int i915_load_modeset_init(struct drm_device
> *dev)
> 
>  	intel_modeset_gem_init(dev);
> 
> -	/* Always safe in the mode setting case. */
> -	/* FIXME: do pre/post-mode set stuff in core KMS code */
> -	dev->vblank_disable_allowed = true;
>  	if (INTEL_INFO(dev)->num_pipes == 0)
>  		return 0;
> 
> diff --git a/drivers/gpu/drm/imx/imx-drm-core.c
> b/drivers/gpu/drm/imx/imx-drm-core.c index 2453fb1c68a7..1080019e7b17
> 100644
> --- a/drivers/gpu/drm/imx/imx-drm-core.c
> +++ b/drivers/gpu/drm/imx/imx-drm-core.c
> @@ -252,13 +252,6 @@ static int imx_drm_driver_load(struct drm_device *drm,
> unsigned long flags) if (ret)
>  		goto err_kms;
> 
> -	/*
> -	 * with vblank_disable_allowed = true, vblank interrupt will be
> -	 * disabled by drm timer once a current process gives up ownership
> -	 * of vblank event. (after drm_vblank_put function is called)
> -	 */
> -	drm->vblank_disable_allowed = true;
> -
>  	platform_set_drvdata(drm->platformdev, drm);
> 
>  	/* Now try and bind all our sub-components */
> diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c
> b/drivers/gpu/drm/radeon/radeon_irq_kms.c index 1e9304d1c88f..c084cadcbf21
> 100644
> --- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
> @@ -291,7 +291,6 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
>  	if (r) {
>  		return r;
>  	}
> -	rdev->ddev->vblank_disable_allowed = true;
> 
>  	/* enable msi */
>  	rdev->msi_enabled = 0;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c index
> ced1e5f93cda..09a4d429c0f0 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -217,13 +217,6 @@ static int rockchip_drm_load(struct drm_device
> *drm_dev, unsigned long flags) if (ret)
>  		goto err_kms_helper_poll_fini;
> 
> -	/*
> -	 * with vblank_disable_allowed = true, vblank interrupt will be disabled
> -	 * by drm timer once a current process gives up ownership of
> -	 * vblank event.(after drm_vblank_put function is called)
> -	 */
> -	drm_dev->vblank_disable_allowed = true;
> -
>  	drm_mode_config_reset(drm_dev);
> 
>  	ret = rockchip_drm_fbdev_init(drm_dev);
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 679905544181..b59c3bf0df44 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -180,7 +180,6 @@ static int tegra_drm_load(struct drm_device *drm,
> unsigned long flags)
> 
>  	/* syncpoints are used for full 32-bit hardware VBLANK counters */
>  	drm->max_vblank_count = 0xffffffff;
> -	drm->vblank_disable_allowed = true;
> 
>  	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
>  	if (err < 0)
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index d423ba10239a..cb37751bc99f 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -207,8 +207,6 @@ int vc4_kms_load(struct drm_device *dev)
>  	dev->mode_config.preferred_depth = 24;
>  	dev->mode_config.async_page_flip = true;
> 
> -	dev->vblank_disable_allowed = true;
> -
>  	drm_mode_config_reset(dev);
> 
>  	vc4->fbdev = drm_fbdev_cma_init(dev, 32,
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index f0d1450d4ea5..30dc7d8c403f 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -819,14 +819,6 @@ struct drm_device {
>  	int irq;
> 
>  	/*
> -	 * At load time, disabling the vblank interrupt won't be allowed since
> -	 * old clients may not call the modeset ioctl and therefore misbehave.
> -	 * Once the modeset ioctl *has* been called though, we can safely
> -	 * disable them when unused.
> -	 */
> -	bool vblank_disable_allowed;
> -
> -	/*
>  	 * If true, vblank interrupt will be disabled immediately when the
>  	 * refcount drops to zero, as opposed to via the vblank disable
>  	 * timer.