From: Sung Joon Kim <sungkim@amd.com>
Date: Wed, 6 Dec 2023 19:52:30 +0000 (-0500)
Subject: drm/amd/display: Exit from idle state before accessing HW data
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fdb0ad2ff7c84bda30bfe3b8f90abd1f8d8788a0;p=linux.git

drm/amd/display: Exit from idle state before accessing HW data

[why & how]
User interface cannot guarantee system is in
idle state, so need to ensure we exit idle state
before accessing any HW data.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Sung Joon Kim <sungkim@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c b/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
index 930fd929e93a4..8c5e7f858be38 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dmub_abm.c
@@ -64,11 +64,15 @@ static void dmub_abm_init_ex(struct abm *abm, uint32_t backlight)
 
 static unsigned int dmub_abm_get_current_backlight_ex(struct abm *abm)
 {
+	dc_allow_idle_optimizations(abm->ctx->dc, false);
+
 	return dmub_abm_get_current_backlight(abm);
 }
 
 static unsigned int dmub_abm_get_target_backlight_ex(struct abm *abm)
 {
+	dc_allow_idle_optimizations(abm->ctx->dc, false);
+
 	return dmub_abm_get_target_backlight(abm);
 }