[PATCH 2/3] backlight: pwm_bl: Artificially add 0% during interpolation
flat view
STALE2223d
SUPERSEDED
From: Alexandru Stan <hidden>
Date: 2020-07-21 04:27:24
Also in:
dri-devel, linux-pwm, lkml
Subsystem:
backlight class/subsystem, framebuffer layer, the rest · Maintainers:
Lee Jones, Daniel Thompson, Jingoo Han, Helge Deller, Linus Torvalds
Revision v1 of 3 in this series.
Revisions (3)
- v1 current
- v2 [diff vs current]
- v3 [diff vs current]
Some displays need the low end of the curve cropped in order to make them happy. In that case we still want to have the 0% point, even though anything between 0% and 5%(example) would be skipped. Signed-off-by: Alexandru Stan <redacted> --- drivers/video/backlight/pwm_bl.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 5193a72305a2..b24711ddf504 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c@@ -349,6 +349,14 @@ static int pwm_backlight_parse_dt(struct device *dev, /* Fill in the last point, since no line starts here. */ table[x2] = y2; + /* + * If we don't start at 0 yet we're increasing, assume + * the dts wanted to crop the low end of the range, so + * insert a 0 to provide a display off mode. + */ + if (table[0] > 0 && table[0] < table[num_levels - 1]) + table[0] = 0; + /* * As we use interpolation lets remove current * brightness levels table and replace for the
--
2.27.0