6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Swapnil Patel <swapnil.patel@xxxxxxx>
[ Upstream commit 5edb7cdff85af8f8c5fda5b88310535ab823f663 ]
[Why & How]
Currently set_default_brightness_aux function uses 5 nits as lower limit
to check for valid default_backlight setting. However some newer panels
can support even lower default settings
Reviewed-by: Agustin Gutierrez <agustin.gutierrez@xxxxxxx>
Acked-by: Roman Li <roman.li@xxxxxxx>
Signed-off-by: Swapnil Patel <swapnil.patel@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Stable-dep-of: d9e865826c20 ("drm/amd/display: Simplify brightness initialization")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../amd/display/dc/link/protocols/link_edp_panel_control.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
index e1708c296b7df..a602202610e09 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
@@ -281,8 +281,8 @@ bool set_default_brightness_aux(struct dc_link *link)
if (link && link->dpcd_sink_ext_caps.bits.oled == 1) {
if (!read_default_bl_aux(link, &default_backlight))
default_backlight = 150000;
- // if < 5 nits or > 5000, it might be wrong readback
- if (default_backlight < 5000 || default_backlight > 5000000)
+ // if < 1 nits or > 5000, it might be wrong readback
+ if (default_backlight < 1000 || default_backlight > 5000000)
default_backlight = 150000; //
return edp_set_backlight_level_nits(link, true,
--
2.42.0
