This is a note to let you know that I've just added the patch titled
drm/radeon: update line buffer allocation for dce6
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-dce6.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 290d24576ccf1aa0373d2185cedfe262d0d4952a Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Mon, 19 Aug 2013 11:15:43 -0400
Subject: drm/radeon: update line buffer allocation for dce6
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 290d24576ccf1aa0373d2185cedfe262d0d4952a 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 dce6 asics.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=64850
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/si.c | 23 +++++++++++++++++++----
drivers/gpu/drm/radeon/sid.h | 4 ++++
2 files changed, 23 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -411,7 +411,8 @@ static u32 dce6_line_buffer_adjust(struc
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.
@@ -426,16 +427,30 @@ static u32 dce6_line_buffer_adjust(struc
* 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;
+ }
WREG32(DC_LB_MEMORY_SPLIT + radeon_crtc->crtc_offset,
DC_LB_MEMORY_CONFIG(tmp));
+ 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/sid.h
+++ b/drivers/gpu/drm/radeon/sid.h
@@ -57,6 +57,10 @@
#define DMIF_ADDR_CALC 0xC00
+#define PIPE0_DMIF_BUFFER_CONTROL 0x0ca0
+# define DMIF_BUFFERS_ALLOCATED(x) ((x) << 0)
+# define DMIF_BUFFERS_ALLOCATED_COMPLETED (1 << 4)
+
#define SRBM_STATUS 0xE50
#define CC_SYS_RB_BACKEND_DISABLE 0xe80
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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