> On Sep 1, 2020, at 22:19, Alex Deucher <alexdeucher@xxxxxxxxx> wrote: > > On Tue, Sep 1, 2020 at 3:32 AM Kai-Heng Feng > <kai.heng.feng@xxxxxxxxxxxxx> wrote: >> >> Suspend with s2idle or by the following steps cause screen frozen: >> # echo devices > /sys/power/pm_test >> # echo freeze > /sys/power/mem >> >> [ 289.625461] [drm:uvd_v1_0_ib_test [radeon]] *ERROR* radeon: fence wait timed out. >> [ 289.625494] [drm:radeon_ib_ring_tests [radeon]] *ERROR* radeon: failed testing IB on ring 5 (-110). >> >> The issue doesn't happen on traditional S3, probably because firmware or >> hardware provides extra power management. >> >> Inspired by Daniel Drake's patch [1] on amdgpu, using a similar approach >> can fix the issue. > > It doesn't actually fix the issue. The device is never powered down > so you are using more power than you would if you did not suspend in > the first place. The reset just works around the fact that the device > is never powered down. So how do we properly suspend/resume the device without help from platform firmware? Kai-Heng > > Alex > >> >> [1] https://patchwork.freedesktop.org/patch/335839/ >> >> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> >> --- >> drivers/gpu/drm/radeon/radeon_device.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c >> index 266e3cbbd09b..df823b9ad79f 100644 >> --- a/drivers/gpu/drm/radeon/radeon_device.c >> +++ b/drivers/gpu/drm/radeon/radeon_device.c >> @@ -33,6 +33,7 @@ >> #include <linux/slab.h> >> #include <linux/vga_switcheroo.h> >> #include <linux/vgaarb.h> >> +#include <linux/suspend.h> >> >> #include <drm/drm_cache.h> >> #include <drm/drm_crtc_helper.h> >> @@ -1643,6 +1644,8 @@ int radeon_suspend_kms(struct drm_device *dev, bool suspend, >> rdev->asic->asic_reset(rdev, true); >> pci_restore_state(dev->pdev); >> } else if (suspend) { >> + if (pm_suspend_no_platform()) >> + rdev->asic->asic_reset(rdev, true); >> /* Shut down the device */ >> pci_disable_device(dev->pdev); >> pci_set_power_state(dev->pdev, PCI_D3hot); >> -- >> 2.17.1 >> >> _______________________________________________ >> dri-devel mailing list >> dri-devel@xxxxxxxxxxxxxxxxxxxxx >> https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
