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 930fd929e93a4fb9dc0c0e7c4d81b58fb6cd180c..8c5e7f858be38a69f2ad5e4ea8e3937541e9d045 100644 (file)
--- 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);
 }