[Nouveau] [PATCH v4 3/4] pci: set the pcie link speed to 8.0 when suspending
Ben Skeggs
skeggsb at gmail.com
Tue Sep 17 06:00:56 UTC 2019
On Fri, 13 Sep 2019 at 21:33, Karol Herbst <kherbst at redhat.com> wrote:
>
> 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
Why this change? Also, I know we don't currently touch it, but what
if x16 isn't available on some systems and we break stuff when we do
start playing with link width?
>
> Signed-off-by: Karol Herbst <kherbst at redhat.com>
> Reviewed-by: Lyude Paul <lyude at redhat.com> (v2)
> ---
> 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 b29101e48..7245513d9 100644
> --- a/drm/nouveau/include/nvkm/subdev/pci.h
> +++ b/drm/nouveau/include/nvkm/subdev/pci.h
> @@ -52,6 +52,7 @@ 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..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 b4203ff1a..5cab4a240 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);
> +}
> +
> void
> nvkm_pcie_force_aspm_off(struct nvkm_pci *pci, bool status)
> {
> @@ -120,7 +136,8 @@ nvkm_pcie_force_aspm_off(struct nvkm_pci *pci, bool status)
> }
>
> 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;
> @@ -154,8 +171,10 @@ 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 82c78befa..6bea37c15 100644
> --- a/drm/nouveau/nvkm/subdev/pci/priv.h
> +++ b/drm/nouveau/nvkm/subdev/pci/priv.h
> @@ -63,4 +63,5 @@ 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
>
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau
More information about the Nouveau
mailing list