aboutsummaryrefslogtreecommitdiffstats
path: root/common/recipes-kernel/linux/files/0846-drm-amd-dal-Prevent-underflow-lock.patch
blob: 0b09b454310ebb31cf786218ba4659ff02dd8cda (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
From 514f76d9dcfd503d00c0905303a4fb580f566dd9 Mon Sep 17 00:00:00 2001
From: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Date: Fri, 26 Feb 2016 15:42:45 -0500
Subject: [PATCH 0846/1110] drm/amd/dal: Prevent underflow lock

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
 drivers/gpu/drm/amd/dal/dc/dce110/dce110_timing_generator.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/dal/dc/dce110/dce110_timing_generator.c b/drivers/gpu/drm/amd/dal/dc/dce110/dce110_timing_generator.c
index d4c5944..d554332 100644
--- a/drivers/gpu/drm/amd/dal/dc/dce110/dce110_timing_generator.c
+++ b/drivers/gpu/drm/amd/dal/dc/dce110/dce110_timing_generator.c
@@ -273,17 +273,13 @@ bool dce110_timing_generator_enable_crtc(struct timing_generator *tg)
 	uint32_t value;
 	struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
 
-	value = dm_read_reg(tg->ctx,
-			CRTC_REG(mmCRTC_MASTER_UPDATE_MODE));
-	set_reg_field_value(value, 0,
-			CRTC_MASTER_UPDATE_MODE, MASTER_UPDATE_MODE);
-	dm_write_reg(tg->ctx,
-			CRTC_REG(mmCRTC_MASTER_UPDATE_MODE), value);
-
-	/* TODO: may want this on for looking for underflow */
 	value = 0;
 	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_MASTER_UPDATE_MODE), value);
 
+	/* TODO: may want this on to catch underflow */
+	value = 0;
+	dm_write_reg(tg->ctx, CRTC_REG(mmCRTC_MASTER_UPDATE_LOCK), value);
+
 	result = tg->bp->funcs->enable_crtc(tg->bp, tg110->controller_id, true);
 
 	return result == BP_RESULT_OK;
-- 
2.7.4