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

commit b96ab339ee50470d13a1faa6ad94d2218a7cd49f upstream.

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@gmail.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3031
Cc: stable@vger.kernel.org
Cc: Camille Cho <camille.cho@amd.com>
Cc: Krunoslav Kovac <krunoslav.kovac@amd.com>
Cc: Hamza Mahfooz <hamza.mahfooz@amd.com>
Fixes: d9e865826c20 ("drm/amd/display: Simplify brightness initialization")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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 fe74d42..13c3d7f 100644 (file)
--- 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
@@ -280,8 +280,8 @@ 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,