From: Jérôme Glisse jglisse@redhat.com
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
Cc: stable@vger.kernel.org Signed-off-by: Jérôme Glisse jglisse@redhat.com --- drivers/gpu/drm/radeon/cik_sdma.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/cik_sdma.c b/drivers/gpu/drm/radeon/cik_sdma.c index f86eb54..d16f2ee 100644 --- a/drivers/gpu/drm/radeon/cik_sdma.c +++ b/drivers/gpu/drm/radeon/cik_sdma.c @@ -268,6 +268,17 @@ static void cik_sdma_gfx_stop(struct radeon_device *rdev) } rdev->ring[R600_RING_TYPE_DMA_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); }
/**