diff options
| author | Akhmed Zhitaev <zhitaevakh@gmail.com> | 2026-08-13 22:09:59 +0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2026-08-19 10:03:37 -0400 |
| commit | 6fd83a1c2cdea48c396f600795217fbdfb8124f6 (patch) | |
| tree | 93a92f2617e7971d4870af5f9cb4cdbba774ed56 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 5827c7ad72b6826d9b90be15af139dd2287e3ca3 (diff) | |
drm/amd/display: Scale custom brightness curve from full range
Custom brightness curves use an 8-bit input signal. After exporting the
full PWM range to userspace, the curve normalizer still divides requests
by the physical PWM span. On panels with a nonzero minimum PWM level,
this can produce a curve input greater than 255 and send an invalid
backlight level to DC.
Scale the userspace [0..max] range to the curve's [0..255] range
instead. This retains the full advertised range and keeps the reverse
readback conversion unchanged.
Fixes: 8dbd72cb7900 ("drm/amd/display: Export full brightness range to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Akhmed Zhitaev <zhitaevakh@gmail.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
(Move to amdgpu_dm_backlight.c)
Link: https://patch.msgid.link/20260813170959.22073-1-zhitaevakh@gmail.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions