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drm/radeon: update line buffer allocation for dce4.1/5

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commit 0b31e02363 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher 2013-08-19 11:06:50 -04:00 committed by Greg Kroah-Hartman
parent 63fffa36d3
commit be70f1f28e
2 changed files with 25 additions and 4 deletions
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25
drivers/gpu/drm/radeon/evergreen.c
View file

@ -534,7 +534,8 @@ 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.
@ -557,18 +558,34 @@ 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:

4
drivers/gpu/drm/radeon/evergreend.h
View file

@ -472,6 +472,10 @@
# define LATENCY_LOW_WATERMARK(x) ((x) << 0)
# define LATENCY_HIGH_WATERMARK(x) ((x) << 16)
#define PIPE0_DMIF_BUFFER_CONTROL 0x0ca0
# define DMIF_BUFFERS_ALLOCATED(x) ((x) << 0)
# define DMIF_BUFFERS_ALLOCATED_COMPLETED (1 << 4)
#define IH_RB_CNTL 0x3e00
# define IH_RB_ENABLE (1 << 0)
# define IH_IB_SIZE(x) ((x) << 1) /* log2 */