[Nouveau] [PATCH 5/6] pci: set the pcie link speed to 8.0 when suspending
Karol Herbst
kherbst at redhat.com
Tue Sep 17 21:00:49 UTC 2019
Apperantly things go south if we suspend the device with a PCIe link speed
set to 2.5. 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
v4: only run the code on suspend
always put the card into 8.0 mode, not what nouveau detected on load
Signed-off-by: Karol Herbst <kherbst at redhat.com>
Reviewed-by: Lyude Paul <lyude at redhat.com>
---
drm/nouveau/include/nvkm/core/device.h | 2 ++
drm/nouveau/include/nvkm/subdev/pci.h | 3 ++-
drm/nouveau/nouveau_drm.c | 1 +
drm/nouveau/nvkm/subdev/clk/base.c | 2 +-
drm/nouveau/nvkm/subdev/pci/base.c | 2 ++
drm/nouveau/nvkm/subdev/pci/pcie.c | 27 ++++++++++++++++++++++----
drm/nouveau/nvkm/subdev/pci/priv.h | 1 +
7 files changed, 32 insertions(+), 6 deletions(-)
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 4803a4fad..10d361e56 100644
--- a/drm/nouveau/include/nvkm/subdev/pci.h
+++ b/drm/nouveau/include/nvkm/subdev/pci.h
@@ -52,5 +52,6 @@ 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);
#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..c9b60ef76 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, suspend);
return 0;
}
diff --git a/drm/nouveau/nvkm/subdev/pci/pcie.c b/drm/nouveau/nvkm/subdev/pci/pcie.c
index ed015b252..6c290b3f5 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",
@@ -106,11 +108,25 @@ nvkm_pcie_init(struct nvkm_pci *pci)
pci->func->pcie.init(pci);
if (pci->pcie.speed != -1)
- nvkm_pcie_set_link(pci, pci->pcie.speed, pci->pcie.width);
+ nvkm_pcie_set_link(pci, pci->pcie.speed,
+ pci->pcie.width, false);
return 0;
}
+int
+nvkm_pcie_fini(struct nvkm_pci *pci, bool suspend)
+{
+ struct nvkm_device *device = pci->subdev.device;
+ if (!device->has_runpm || !suspend)
+ return 0;
+
+ if (!nvkm_boolopt(device->cfgopt, "NvRunpmWorkaround", true))
+ return 0;
+
+ return nvkm_pcie_set_link(pci, NVKM_PCIE_SPEED_8_0, 16, false);
+}
+
enum nvkm_pci_aspm
nvkm_pcie_aspm_off(struct nvkm_pci *pci, enum nvkm_pci_aspm states)
{
@@ -120,7 +136,8 @@ nvkm_pcie_aspm_off(struct nvkm_pci *pci, enum nvkm_pci_aspm states)
}
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;
@@ -155,8 +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.speed = speed;
+ pci->pcie.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 17be1d563..d9a32b41e 100644
--- a/drm/nouveau/nvkm/subdev/pci/priv.h
+++ b/drm/nouveau/nvkm/subdev/pci/priv.h
@@ -71,4 +71,5 @@ int gk104_pcie_version_supported(struct nvkm_pci *);
int nvkm_pcie_oneinit(struct nvkm_pci *);
int nvkm_pcie_init(struct nvkm_pci *);
+int nvkm_pcie_fini(struct nvkm_pci *, bool suspend);
#endif
--
2.21.0
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