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pwm-backlight: retrieve configured PWM period 

The PWM core is now able to initialize the PWM period from a lookup
table defined by board files. Use it if available and fallback to the
value supplied in pwm_period_ns.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Alexandre Belloni 2014-05-19 22:42:42 +02:00 committed by Thierry Reding
parent 81225bed32
commit 16fc3352ea
1 changed files with 7 additions and 4 deletions
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11
drivers/video/backlight/pwm_bl.c
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@ -296,12 +296,15 @@ static int pwm_backlight_probe(struct platform_device *pdev)
/* /*
* The DT case will set the pwm_period_ns field to 0 and store the * The DT case will set the pwm_period_ns field to 0 and store the
* period, parsed from the DT, in the PWM device. For the non-DT case, * period, parsed from the DT, in the PWM device. For the non-DT case,
* set the period from platform data. * set the period from platform data if it has not already been set
* via the PWM lookup table.
*/ */
if (data->pwm_period_ns > 0)
pwm_set_period(pb->pwm, data->pwm_period_ns);
pb->period = pwm_get_period(pb->pwm); pb->period = pwm_get_period(pb->pwm);
if (!pb->period && (data->pwm_period_ns > 0)) {
pb->period = data->pwm_period_ns;
pwm_set_period(pb->pwm, data->pwm_period_ns);
}
pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale); pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);
memset(&props, 0, sizeof(struct backlight_properties)); memset(&props, 0, sizeof(struct backlight_properties));