[PATCH] drm/amd/display: Restore guard against default backlight value < 1 nit

[Mario Limonciello]

Mark reports that brightness is not restored after Xorg dpms screen blank.

This behavior was introduced by commit d9e865826c20 ("drm/amd/display:
Simplify brightness initialization") which dropped the cached backlight
value in display code, but also removed code for when the default value
read back was less than 1 nit.

Restore this code so that the backlight brightness is restored to the
correct default value in this circumstance.

Reported-by: Mark Herbert <mark.herbert42 at gmail.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3031
Cc: stable at vger.kernel.org
Cc: Camille Cho <camille.cho at amd.com>
Cc: Krunoslav Kovac <krunoslav.kovac at amd.com>
Cc: Hamza Mahfooz <hamza.mahfooz at amd.com>
Fixes: d9e865826c20 ("drm/amd/display: Simplify brightness initialization")
Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
---
 .../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 ac0fa88b52a0..bf53a86ea817 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
@@ -287,8 +287,8 @@ 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 > 5000, it might be wrong readback
-		if (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,
-- 
2.34.1