diff options
| author |   Alex Deucher <alexander.deucher@amd.com> | 2013-08-19 11:06:50 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-08-30 16:31:00 -0400 |
| commit | 0b31e02363b0db4e7931561bc6c141436e729d9f (patch) | |
| tree | aa4e98b8d2efcedb78561549b4a37e72dd08be65 /drivers/gpu/drm/radeon/evergreen.c | |
| parent | drm/radeon/si: Add support for CP DMA to CS checker for compute v2 (diff) | |
| download | linux-dev-0b31e02363b0db4e7931561bc6c141436e729d9f.tar.xz linux-dev-0b31e02363b0db4e7931561bc6c141436e729d9f.zip | |
drm/radeon: update line buffer allocation for dce4.1/5
We need to allocate line buffer to each display when
setting up the watermarks. Failure to do so can lead
to a blank screen. This fixes blank screen problems
on dce4.1/5 asics.
Based on an initial fix from:
Jay Cornwall <jay.cornwall@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu/drm/radeon/evergreen.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/evergreen.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c index 2ca9f13f2c79..183213689478 100644 --- a/drivers/gpu/drm/radeon/evergreen.c +++ b/drivers/gpu/drm/radeon/evergreen.c @@ -1812,7 +1812,8 @@ static u32 evergreen_line_buffer_adjust(struct radeon_device *rdev, struct drm_display_mode *mode, struct drm_display_mode *other_mode) { - u32 tmp; + u32 tmp, buffer_alloc, i; + u32 pipe_offset = radeon_crtc->crtc_id * 0x20; /* * Line Buffer Setup * There are 3 line buffers, each one shared by 2 display controllers. @@ -1835,18 +1836,34 @@ static u32 evergreen_line_buffer_adjust(struct radeon_device *rdev, * non-linked crtcs for maximum line buffer allocation. */ if (radeon_crtc->base.enabled && mode) { - if (other_mode) + if (other_mode) { tmp = 0; /* 1/2 */ - else + buffer_alloc = 1; + } else { tmp = 2; /* whole */ - } else + buffer_alloc = 2; + } + } else { tmp = 0; + buffer_alloc = 0; + } /* second controller of the pair uses second half of the lb */ if (radeon_crtc->crtc_id % 2) tmp += 4; WREG32(DC_LB_MEMORY_SPLIT + radeon_crtc->crtc_offset, tmp); + if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE5(rdev)) { + WREG32(PIPE0_DMIF_BUFFER_CONTROL + pipe_offset, + DMIF_BUFFERS_ALLOCATED(buffer_alloc)); + for (i = 0; i < rdev->usec_timeout; i++) { + if (RREG32(PIPE0_DMIF_BUFFER_CONTROL + pipe_offset) & + DMIF_BUFFERS_ALLOCATED_COMPLETED) + break; + udelay(1); + } + } + if (radeon_crtc->base.enabled && mode) { switch (tmp) { case 0: |