lkml.org 
[lkml]   [2019]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] backlight: pwm_bl: Fix heuristic to determine number of brightness levels
Date
With commit 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of
LED linearly to human eye") the number of set bits (aka hweight())
in the PWM period is used in the heuristic to determine the number
of brightness levels, when the brightness table isn't specified in
the DT. The number of set bits doesn't provide a reliable clue about
the length of the period, instead change the heuristic to:

nlevels = period / fls(period)

Also limit the maximum number of brightness levels to 4096 to avoid
excessively large tables.

With this the number of levels increases monotonically with the PWM
period, until the maximum of 4096 levels is reached:

period (ns) # levels

100 16
500 62
1000 111
5000 416
10000 769
50000 3333
100000 4096

Fixes: 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly to human eye")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
drivers/video/backlight/pwm_bl.c | 24 ++++++------------------
1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index fb45f866b923..0b7152fa24f7 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -194,29 +194,17 @@ int pwm_backlight_brightness_default(struct device *dev,
struct platform_pwm_backlight_data *data,
unsigned int period)
{
- unsigned int counter = 0;
- unsigned int i, n;
+ unsigned int i;
u64 retval;

/*
- * Count the number of bits needed to represent the period number. The
- * number of bits is used to calculate the number of levels used for the
- * brightness-levels table, the purpose of this calculation is have a
- * pre-computed table with enough levels to get linear brightness
- * perception. The period is divided by the number of bits so for a
- * 8-bit PWM we have 255 / 8 = 32 brightness levels or for a 16-bit PWM
- * we have 65535 / 16 = 4096 brightness levels.
- *
- * Note that this method is based on empirical testing on different
- * devices with PWM of 8 and 16 bits of resolution.
+ * Once we have 4096 levels there's little point going much higher...
+ * neither interactive sliders nor animation benefits from having
+ * more values in the table.
*/
- n = period;
- while (n) {
- counter += n % 2;
- n >>= 1;
- }
+ data->max_brightness =
+ min((int)DIV_ROUND_UP(period, fls(period)), 4096);

- data->max_brightness = DIV_ROUND_UP(period, counter);
data->levels = devm_kcalloc(dev, data->max_brightness,
sizeof(*data->levels), GFP_KERNEL);
if (!data->levels)
--
2.22.0.rc2.383.gf4fbbf30c2-goog
\
 
 \ /
  Last update: 2019-06-12 20:00    [W:0.045 / U:6.224 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site