[3/4] pci: save the boot pcie link speed and restore it on fini

Submitted by Karol Herbst on Aug. 13, 2019, 9:19 a.m.

Details

Message ID 20190813091957.4812-3-kherbst@redhat.com
State New
Headers show
Series "Series without cover letter" ( rev: 1 ) in Nouveau

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Commit Message

Karol Herbst Aug. 13, 2019, 9:19 a.m.
Apperantly things go south if we suspend the device with a different PCIE
link speed set than it got booted with. Fixes runtime suspend on my gp107.

This all looks like some bug inside the pci subsystem and I would prefer a
fix there instead of nouveau, but maybe there is no real nice way of doing
that outside of drivers?

v2: squashed together patch 4 and 5
v3: only restore pcie speed on machines with runpm
    add NvRunpmWorkaround config option to disable the workaround

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com> (v2)
---
 drm/nouveau/include/nvkm/core/device.h |  2 ++
 drm/nouveau/include/nvkm/subdev/pci.h  |  8 ++++--
 drm/nouveau/nouveau_drm.c              |  1 +
 drm/nouveau/nvkm/subdev/clk/base.c     |  2 +-
 drm/nouveau/nvkm/subdev/pci/base.c     |  9 ++++--
 drm/nouveau/nvkm/subdev/pci/pcie.c     | 38 ++++++++++++++++++++++----
 drm/nouveau/nvkm/subdev/pci/priv.h     |  2 ++
 7 files changed, 51 insertions(+), 11 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drm/nouveau/include/nvkm/core/device.h b/drm/nouveau/include/nvkm/core/device.h
index 6d55cd047..4fb3f972f 100644
--- a/drm/nouveau/include/nvkm/core/device.h
+++ b/drm/nouveau/include/nvkm/core/device.h
@@ -125,6 +125,8 @@  struct nvkm_device {
 	u8  chiprev;
 	u32 crystal;
 
+	bool has_runpm;
+
 	struct {
 		struct notifier_block nb;
 	} acpi;
diff --git a/drm/nouveau/include/nvkm/subdev/pci.h b/drm/nouveau/include/nvkm/subdev/pci.h
index b29101e48..56e73412f 100644
--- a/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drm/nouveau/include/nvkm/subdev/pci.h
@@ -26,8 +26,9 @@  struct nvkm_pci {
 	} agp;
 
 	struct {
-		enum nvkm_pcie_speed speed;
-		u8 width;
+		enum nvkm_pcie_speed cur_speed;
+		enum nvkm_pcie_speed def_speed;
+		u8 cur_width;
 	} pcie;
 
 	bool msi;
@@ -52,6 +53,7 @@  int gk104_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
 int gp100_pci_new(struct nvkm_device *, int, struct nvkm_pci **);
 
 /* pcie functions */
-int nvkm_pcie_set_link(struct nvkm_pci *, enum nvkm_pcie_speed, u8 width);
+int nvkm_pcie_set_link(struct nvkm_pci *, enum nvkm_pcie_speed, u8 width,
+		       bool save);
 enum nvkm_pcie_speed nvkm_pcie_get_speed(struct nvkm_pci *);
 #endif
diff --git a/drm/nouveau/nouveau_drm.c b/drm/nouveau/nouveau_drm.c
index 3d32afe8a..78d55c525 100644
--- a/drm/nouveau/nouveau_drm.c
+++ b/drm/nouveau/nouveau_drm.c
@@ -676,6 +676,7 @@  static int nouveau_drm_probe(struct pci_dev *pdev,
 
 	if (nouveau_atomic)
 		driver_pci.driver_features |= DRIVER_ATOMIC;
+	device->has_runpm = nouveau_pmops_runtime();
 
 	drm_dev = drm_dev_alloc(&driver_pci, &pdev->dev);
 	if (IS_ERR(drm_dev)) {
diff --git a/drm/nouveau/nvkm/subdev/clk/base.c b/drm/nouveau/nvkm/subdev/clk/base.c
index ba6a868d4..e30e77453 100644
--- a/drm/nouveau/nvkm/subdev/clk/base.c
+++ b/drm/nouveau/nvkm/subdev/clk/base.c
@@ -277,7 +277,7 @@  nvkm_pstate_prog(struct nvkm_clk *clk, int pstatei)
 	nvkm_debug(subdev, "setting performance state %d\n", pstatei);
 	clk->pstate = pstatei;
 
-	nvkm_pcie_set_link(pci, pstate->pcie_speed, pstate->pcie_width);
+	nvkm_pcie_set_link(pci, pstate->pcie_speed, pstate->pcie_width, true);
 
 	if (fb && fb->ram && fb->ram->func->calc) {
 		struct nvkm_ram *ram = fb->ram;
diff --git a/drm/nouveau/nvkm/subdev/pci/base.c b/drm/nouveau/nvkm/subdev/pci/base.c
index ee2431a78..d9fb5a83f 100644
--- a/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drm/nouveau/nvkm/subdev/pci/base.c
@@ -90,6 +90,8 @@  nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
 
 	if (pci->agp.bridge)
 		nvkm_agp_fini(pci);
+	else if (pci_is_pcie(pci->pdev))
+		nvkm_pcie_fini(pci);
 
 	return 0;
 }
@@ -100,6 +102,8 @@  nvkm_pci_preinit(struct nvkm_subdev *subdev)
 	struct nvkm_pci *pci = nvkm_pci(subdev);
 	if (pci->agp.bridge)
 		nvkm_agp_preinit(pci);
+	else if (pci_is_pcie(pci->pdev))
+		nvkm_pcie_preinit(pci);
 	return 0;
 }
 
@@ -193,8 +197,9 @@  nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
 	pci->func = func;
 	pci->pdev = device->func->pci(device)->pdev;
 	pci->irq = -1;
-	pci->pcie.speed = -1;
-	pci->pcie.width = -1;
+	pci->pcie.cur_speed = -1;
+	pci->pcie.def_speed = -1;
+	pci->pcie.cur_width = -1;
 
 	if (device->type == NVKM_DEVICE_AGP)
 		nvkm_agp_ctor(pci);
diff --git a/drm/nouveau/nvkm/subdev/pci/pcie.c b/drm/nouveau/nvkm/subdev/pci/pcie.c
index 03be24930..d6b7ad6a8 100644
--- a/drm/nouveau/nvkm/subdev/pci/pcie.c
+++ b/drm/nouveau/nvkm/subdev/pci/pcie.c
@@ -23,6 +23,8 @@ 
  */
 #include "priv.h"
 
+#include <core/option.h>
+
 static char *nvkm_pcie_speeds[] = {
 	"2.5GT/s",
 	"5.0GT/s",
@@ -85,6 +87,13 @@  nvkm_pcie_oneinit(struct nvkm_pci *pci)
 	return 0;
 }
 
+int
+nvkm_pcie_preinit(struct nvkm_pci *pci)
+{
+	pci->pcie.def_speed = nvkm_pcie_get_speed(pci);
+	return 0;
+}
+
 int
 nvkm_pcie_init(struct nvkm_pci *pci)
 {
@@ -105,14 +114,31 @@  nvkm_pcie_init(struct nvkm_pci *pci)
 	if (pci->func->pcie.init)
 		pci->func->pcie.init(pci);
 
-	if (pci->pcie.speed != -1)
-		nvkm_pcie_set_link(pci, pci->pcie.speed, pci->pcie.width);
+	if (pci->pcie.cur_speed != -1)
+		nvkm_pcie_set_link(pci, pci->pcie.cur_speed,
+				   pci->pcie.cur_width, false);
+
+	return 0;
+}
+
+int
+nvkm_pcie_fini(struct nvkm_pci *pci)
+{
+	struct nvkm_device *device = pci->subdev.device;
+	if (!device->has_runpm)
+		return 0;
+
+	if (!nvkm_boolopt(device->cfgopt, "NvRunpmWorkaround", true))
+		return 0;
 
+	if (!IS_ERR_VALUE(pci->pcie.def_speed))
+		return nvkm_pcie_set_link(pci, pci->pcie.def_speed, 16, false);
 	return 0;
 }
 
 int
-nvkm_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
+nvkm_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width,
+                   bool save)
 {
 	struct nvkm_subdev *subdev = &pci->subdev;
 	enum nvkm_pcie_speed cur_speed, max_speed;
@@ -146,8 +172,10 @@  nvkm_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
 		speed = max_speed;
 	}
 
-	pci->pcie.speed = speed;
-	pci->pcie.width = width;
+	if (save) {
+		pci->pcie.cur_speed = speed;
+		pci->pcie.cur_width = width;
+	}
 
 	if (speed == cur_speed) {
 		nvkm_debug(subdev, "requested matches current speed\n");
diff --git a/drm/nouveau/nvkm/subdev/pci/priv.h b/drm/nouveau/nvkm/subdev/pci/priv.h
index 162ed5dc6..85be0594f 100644
--- a/drm/nouveau/nvkm/subdev/pci/priv.h
+++ b/drm/nouveau/nvkm/subdev/pci/priv.h
@@ -60,5 +60,7 @@  enum nvkm_pcie_speed gk104_pcie_max_speed(struct nvkm_pci *);
 int gk104_pcie_version_supported(struct nvkm_pci *);
 
 int nvkm_pcie_oneinit(struct nvkm_pci *);
+int nvkm_pcie_preinit(struct nvkm_pci *);
 int nvkm_pcie_init(struct nvkm_pci *);
+int nvkm_pcie_fini(struct nvkm_pci *);
 #endif