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drm/amd/display: Reduce default backlight min from 5 nits to 1 nits

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[ 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@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Swapnil Patel <swapnil.patel@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: d9e865826c20 ("drm/amd/display: Simplify brightness initialization")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Swapnil Patel 2023-10-04 15:58:57 -04:00 committed by Greg Kroah-Hartman
parent 5e03e4a491
commit 86cd446a77
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
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@ -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,