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drm/amd/display: check attr flag before set cursor degamma on DCN3+

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commit 96b020e2163fb2197266b2f71b1007495206e6bb upstream.

Don't set predefined degamma curve to cursor plane if the cursor
attribute flag is not set. Applying a degamma curve to the cursor by
default breaks userspace expectation. Checking the flag before
performing any color transformation prevents too dark cursor gamma in
DCN3+ on many Linux desktop environment (KDE Plasma, GNOME,
wlroots-based, etc.) as reported at:
- https://gitlab.freedesktop.org/drm/amd/-/issues/1513

This is the same approach followed by DCN2 drivers where the issue is
not present.

Fixes: 03f54d7d34 ("drm/amd/display: Add DCN3 DPP")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1513
Signed-off-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Melissa Wen 2023-07-31 07:35:05 -01:00 committed by Greg Kroah-Hartman
parent 188e8e25ae
commit a73d999fdf
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.c
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@ -354,8 +354,11 @@ void dpp3_set_cursor_attributes(
int cur_rom_en = 0;
if (color_format == CURSOR_MODE_COLOR_PRE_MULTIPLIED_ALPHA ||
color_format == CURSOR_MODE_COLOR_UN_PRE_MULTIPLIED_ALPHA)
cur_rom_en = 1;
color_format == CURSOR_MODE_COLOR_UN_PRE_MULTIPLIED_ALPHA) {
if (cursor_attributes->attribute_flags.bits.ENABLE_CURSOR_DEGAMMA) {
cur_rom_en = 1;
}
}
REG_UPDATE_3(CURSOR0_CONTROL,
CUR0_MODE, color_format,