Commit 196a868e authored by Jérôme Glisse's avatar Jérôme Glisse Committed by Luis Henriques

drm/radeon: SDMA fix hibernation (CI GPU family).

commit 2ba8d1bb upstream.

In order for hibernation to reliably work we need to properly turn
off the SDMA block, sadly after numerous attemps i haven't not found
proper sequence for clean and full shutdown. So simply reset both
SDMA block, this makes hibernation works reliably on sea island GPU
family (CI)

Hibernation and suspend to ram were tested (several times) on :
Bonaire
Hawaii
Mullins
Kaveri
Kabini
Signed-off-by: default avatarJérôme Glisse <jglisse@redhat.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 15a518e1
...@@ -266,6 +266,17 @@ static void cik_sdma_gfx_stop(struct radeon_device *rdev) ...@@ -266,6 +266,17 @@ static void cik_sdma_gfx_stop(struct radeon_device *rdev)
} }
rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false; rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false;
rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX].ready = false; rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX].ready = false;
/* FIXME use something else than big hammer but after few days can not
* seem to find good combination so reset SDMA blocks as it seems we
* do not shut them down properly. This fix hibernation and does not
* affect suspend to ram.
*/
WREG32(SRBM_SOFT_RESET, SOFT_RESET_SDMA | SOFT_RESET_SDMA1);
(void)RREG32(SRBM_SOFT_RESET);
udelay(50);
WREG32(SRBM_SOFT_RESET, 0);
(void)RREG32(SRBM_SOFT_RESET);
} }
/** /**
......
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