[v3,2/3] drm/msm/dpu: Integrate interconnect API in MDSS

Submitted by Sravanthi Kollukuduru on Nov. 22, 2018, 9:06 a.m.

Details

Message ID 20181122090653.3523-3-skolluku@codeaurora.org
State New
Headers show
Series "Use interconnect API in MDSS on SDM845" ( rev: 1 ) in Freedreno

Not browsing as part of any series.

Commit Message

Sravanthi Kollukuduru Nov. 22, 2018, 9:06 a.m.
The interconnect framework is designed to provide a
standard kernel interface to control the settings of
the interconnects on a SoC.

The interconnect API uses a consumer/provider-based model,
where the providers are the interconnect buses and the
consumers could be various drivers.

MDSS is one of the interconnect consumers which uses the
interconnect APIs to get the path between endpoints and
set its bandwidth/latency/QoS requirements for the given
interconnected path.

Changes in v2:
	- Remove error log and unnecessary check (Jordan Crouse)

Changes in v3:
	- Code clean involving variable name change, removal
	  of extra paranthesis and variables (Matthias Kaehlcke)

Signed-off-by: Sravanthi Kollukuduru <skolluku@codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 49 ++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 5 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 38576f8b90b6..1387a6b1b39e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -4,10 +4,12 @@ 
  */
 
 #include "dpu_kms.h"
+#include <linux/interconnect.h>
 
 #define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
 
-#define HW_INTR_STATUS			0x0010
+#define HW_INTR_STATUS	0x0010
+#define MAX_BW		6800000
 
 struct dpu_mdss {
 	struct msm_mdss base;
@@ -16,8 +18,30 @@  struct dpu_mdss {
 	u32 hwversion;
 	struct dss_module_power mp;
 	struct dpu_irq_controller irq_controller;
+	struct icc_path *path[2];
+	u32 num_paths;
 };
 
+static int dpu_mdss_parse_data_bus_icc_path(
+		struct drm_device *dev, struct dpu_mdss *dpu_mdss)
+{
+	struct icc_path *path0 = of_icc_get(dev->dev, "port0");
+	struct icc_path *path1 = of_icc_get(dev->dev, "port1");
+
+	if (IS_ERR(path0))
+		return PTR_ERR(path0);
+
+	dpu_mdss->path[0] = path0;
+	dpu_mdss->num_paths = 1;
+
+	if (!IS_ERR(path1)) {
+		dpu_mdss->path[1] = path1;
+		dpu_mdss->num_paths++;
+	}
+
+	return 0;
+}
+
 static irqreturn_t dpu_mdss_irq(int irq, void *arg)
 {
 	struct dpu_mdss *dpu_mdss = arg;
@@ -127,7 +151,11 @@  static int dpu_mdss_enable(struct msm_mdss *mdss)
 {
 	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
 	struct dss_module_power *mp = &dpu_mdss->mp;
-	int ret;
+	int ret, i;
+	u64 avg_bw = dpu_mdss->num_paths ? MAX_BW/dpu_mdss->num_paths : 0;
+
+	for (i = 0; i < dpu_mdss->num_paths; i++)
+		icc_set(dpu_mdss->path[i], avg_bw, MAX_BW);
 
 	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
 	if (ret)
@@ -140,12 +168,15 @@  static int dpu_mdss_disable(struct msm_mdss *mdss)
 {
 	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
 	struct dss_module_power *mp = &dpu_mdss->mp;
-	int ret;
+	int ret, i;
 
 	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
 	if (ret)
 		DPU_ERROR("clock disable failed, ret:%d\n", ret);
 
+	for (i = 0; i < dpu_mdss->num_paths; i++)
+		icc_set(dpu_mdss->path[i], 0, 0);
+
 	return ret;
 }
 
@@ -155,6 +186,7 @@  static void dpu_mdss_destroy(struct drm_device *dev)
 	struct msm_drm_private *priv = dev->dev_private;
 	struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
 	struct dss_module_power *mp = &dpu_mdss->mp;
+	int i;
 
 	pm_runtime_disable(dev->dev);
 	_dpu_mdss_irq_domain_fini(dpu_mdss);
@@ -162,6 +194,9 @@  static void dpu_mdss_destroy(struct drm_device *dev)
 	msm_dss_put_clk(mp->clk_config, mp->num_clk);
 	devm_kfree(&pdev->dev, mp->clk_config);
 
+	for (i = 0; i < dpu_mdss->num_paths; i++)
+		icc_put(dpu_mdss->path[i]);
+
 	if (dpu_mdss->mmio)
 		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
 	dpu_mdss->mmio = NULL;
@@ -200,6 +235,10 @@  int dpu_mdss_init(struct drm_device *dev)
 	}
 	dpu_mdss->mmio_len = resource_size(res);
 
+	ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
+	if (ret)
+		return ret;
+
 	mp = &dpu_mdss->mp;
 	ret = msm_dss_parse_clock(pdev, mp);
 	if (ret) {
@@ -221,14 +260,14 @@  int dpu_mdss_init(struct drm_device *dev)
 		goto irq_error;
 	}
 
+	priv->mdss = &dpu_mdss->base;
+
 	pm_runtime_enable(dev->dev);
 
 	pm_runtime_get_sync(dev->dev);
 	dpu_mdss->hwversion = readl_relaxed(dpu_mdss->mmio);
 	pm_runtime_put_sync(dev->dev);
 
-	priv->mdss = &dpu_mdss->base;
-
 	return ret;
 
 irq_error:

Comments

Hi Sravanthi,

Thanks for the patch!

On 11/22/18 11:06, Sravanthi Kollukuduru wrote:
> The interconnect framework is designed to provide a
> standard kernel interface to control the settings of
> the interconnects on a SoC.
> 
> The interconnect API uses a consumer/provider-based model,
> where the providers are the interconnect buses and the
> consumers could be various drivers.
> 
> MDSS is one of the interconnect consumers which uses the
> interconnect APIs to get the path between endpoints and
> set its bandwidth/latency/QoS requirements for the given
> interconnected path.
> 
> Changes in v2:
> 	- Remove error log and unnecessary check (Jordan Crouse)
> 
> Changes in v3:
> 	- Code clean involving variable name change, removal
> 	  of extra paranthesis and variables (Matthias Kaehlcke)
> 
> Signed-off-by: Sravanthi Kollukuduru <skolluku@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 49 ++++++++++++++++++++++++++++----
>  1 file changed, 44 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> index 38576f8b90b6..1387a6b1b39e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> @@ -4,10 +4,12 @@
>   */
>  
>  #include "dpu_kms.h"
> +#include <linux/interconnect.h>
>  
>  #define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
>  
> -#define HW_INTR_STATUS			0x0010
> +#define HW_INTR_STATUS	0x0010

Unrelated change?

> +#define MAX_BW		6800000

In what units? Maybe add a comment.

>  
>  struct dpu_mdss {
>  	struct msm_mdss base;
> @@ -16,8 +18,30 @@ struct dpu_mdss {
>  	u32 hwversion;
>  	struct dss_module_power mp;
>  	struct dpu_irq_controller irq_controller;
> +	struct icc_path *path[2];
> +	u32 num_paths;
>  };
>  
> +static int dpu_mdss_parse_data_bus_icc_path(
> +		struct drm_device *dev, struct dpu_mdss *dpu_mdss)

Nit: Lines should not end with a '('. Please move the first argument up:

static int dpu_mdss_parse_data_bus_icc_path(struct drm_device *dev,
					    struct dpu_mdss *dpu_mdss)

> +{
> +	struct icc_path *path0 = of_icc_get(dev->dev, "port0");
> +	struct icc_path *path1 = of_icc_get(dev->dev, "port1");

In DT it's preferred that the name contains both the source and
destination, so maybe of_icc_get(dev->dev, "mdp0-mem") etc.

> +
> +	if (IS_ERR(path0))
> +		return PTR_ERR(path0);
> +
> +	dpu_mdss->path[0] = path0;
> +	dpu_mdss->num_paths = 1;
> +
> +	if (!IS_ERR(path1)) {
> +		dpu_mdss->path[1] = path1;
> +		dpu_mdss->num_paths++;
> +	}
> +
> +	return 0;
> +}
> +
>  static irqreturn_t dpu_mdss_irq(int irq, void *arg)
>  {
>  	struct dpu_mdss *dpu_mdss = arg;
> @@ -127,7 +151,11 @@ static int dpu_mdss_enable(struct msm_mdss *mdss)
>  {
>  	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
>  	struct dss_module_power *mp = &dpu_mdss->mp;
> -	int ret;
> +	int ret, i;
> +	u64 avg_bw = dpu_mdss->num_paths ? MAX_BW/dpu_mdss->num_paths : 0;

Nit: Please add spaces around "/"

> +
> +	for (i = 0; i < dpu_mdss->num_paths; i++)
> +		icc_set(dpu_mdss->path[i], avg_bw, MAX_BW);

Now we have macros in the header, that can be used to specify the
bandwidth units. So please use kBps_to_icc or MBps_to_icc etc. If we
decide in the future to change the internal units, we will be able to do
it without touching the users.

Thanks,
Georgi

>  
>  	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
>  	if (ret)
> @@ -140,12 +168,15 @@ static int dpu_mdss_disable(struct msm_mdss *mdss)
>  {
>  	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
>  	struct dss_module_power *mp = &dpu_mdss->mp;
> -	int ret;
> +	int ret, i;
>  
>  	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
>  	if (ret)
>  		DPU_ERROR("clock disable failed, ret:%d\n", ret);
>  
> +	for (i = 0; i < dpu_mdss->num_paths; i++)
> +		icc_set(dpu_mdss->path[i], 0, 0);
> +
>  	return ret;
>  }
>  
> @@ -155,6 +186,7 @@ static void dpu_mdss_destroy(struct drm_device *dev)
>  	struct msm_drm_private *priv = dev->dev_private;
>  	struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
>  	struct dss_module_power *mp = &dpu_mdss->mp;
> +	int i;
>  
>  	pm_runtime_disable(dev->dev);
>  	_dpu_mdss_irq_domain_fini(dpu_mdss);
> @@ -162,6 +194,9 @@ static void dpu_mdss_destroy(struct drm_device *dev)
>  	msm_dss_put_clk(mp->clk_config, mp->num_clk);
>  	devm_kfree(&pdev->dev, mp->clk_config);
>  
> +	for (i = 0; i < dpu_mdss->num_paths; i++)
> +		icc_put(dpu_mdss->path[i]);
> +
>  	if (dpu_mdss->mmio)
>  		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
>  	dpu_mdss->mmio = NULL;
> @@ -200,6 +235,10 @@ int dpu_mdss_init(struct drm_device *dev)
>  	}
>  	dpu_mdss->mmio_len = resource_size(res);
>  
> +	ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
> +	if (ret)
> +		return ret;
> +
>  	mp = &dpu_mdss->mp;
>  	ret = msm_dss_parse_clock(pdev, mp);
>  	if (ret) {
> @@ -221,14 +260,14 @@ int dpu_mdss_init(struct drm_device *dev)
>  		goto irq_error;
>  	}
>  
> +	priv->mdss = &dpu_mdss->base;
> +
>  	pm_runtime_enable(dev->dev);
>  
>  	pm_runtime_get_sync(dev->dev);
>  	dpu_mdss->hwversion = readl_relaxed(dpu_mdss->mmio);
>  	pm_runtime_put_sync(dev->dev);
>  
> -	priv->mdss = &dpu_mdss->base;
> -
>  	return ret;
>  
>  irq_error:
>