This is a note to let you know that I've just added the patch titled
drm/radeon: update line buffer allocation for dce4.1/5
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-update-line-buffer-allocation-for-dce4.1-5.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0b31e02363b0db4e7931561bc6c141436e729d9f Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Mon, 19 Aug 2013 11:06:50 -0400
Subject: drm/radeon: update line buffer allocation for dce4.1/5
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 0b31e02363b0db4e7931561bc6c141436e729d9f 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@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/evergreen.c | 25 +++++++++++++++++++++----
drivers/gpu/drm/radeon/evergreend.h | 4 ++++
2 files changed, 25 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -534,7 +534,8 @@ static u32 evergreen_line_buffer_adjust(
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(
* 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:
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -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 */
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.4/drm-radeon-fix-lcd-record-parsing.patch
queue-3.4/drm-radeon-fix-resume-on-some-rs4xx-boards-v2.patch
queue-3.4/drm-radeon-fix-endian-bugs-in-hw-i2c-atom-routines.patch
queue-3.4/drm-radeon-update-line-buffer-allocation-for-dce6.patch
queue-3.4/drm-radeon-update-line-buffer-allocation-for-dce4.1-5.patch
queue-3.4/drm-radeon-fix-handling-of-variable-sized-arrays-for-router-objects.patch
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