On Sat, Oct 29, 2016 at 01:40:03AM +0200, Peter Wu wrote:
Check whether the kernel really supports power resources for a device, otherwise the power might not be removed when the device is runtime suspended (DSM should still work in these cases where PR does not).
Link: https://bugs.freedesktop.org/show_bug.cgi?id=98398 Fixes: 692a17dcc292 ("drm/nouveau/acpi: fix lockup with PCIe runtime PM") Signed-off-by: Peter Wu peter@lekensteyn.nl
Hi,
Maybe Cc: stable (4.8+)?
Compile-tested only. Rick, can you test if this patch fixes the problem for you?
This check was actually in the original patch, but it was changed: https://lists.freedesktop.org/archives/nouveau/2016-May/025125.html Re-adding the check as suggested by Mika.
Kind regards, Peter
drivers/gpu/drm/nouveau/nouveau_acpi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c index dc57b62..193573d 100644 --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c @@ -240,7 +240,8 @@ static bool nouveau_pr3_present(struct pci_dev *pdev) if (!parent_adev) return false;
- return acpi_has_method(parent_adev->handle, "_PR3");
You may want to add comment here telling why we need to check flags.power_resources. Or alternatively explain this in the changelog (along the lines that we fail to find PowerResources because ACPICA does not handle certain conditional things in the same way than Windows 10).
Other than that, looks good
Reviewed-by: Mika Westerberg mika.westerberg@linux.intel.com
- return parent_adev->power.flags.power_resources &&
acpi_has_method(parent_adev->handle, "_PR3");}
static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
2.10.1