Patch "drm/radeon: update line buffer allocation for dce6" has been added to the 3.4-stable tree

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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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