On Mon, Jul 09, 2012 at 01:21:40PM +0900, Alexandre Courbot wrote:
> pwm_backlight_update_status calls two callbacks before and after
> applying the new PWM settings. However, the brightness scale is
> completely changed in between if brightness levels are used. This patch
> ensures that both callbacks are passed brightness values of the same
> meaning.
>
> Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
> ---
> drivers/video/backlight/pwm_bl.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
I had to actually read this patch a number of times and then realized I
was completely missing the context. Looking at the whole function makes
it more obvious what you mean.
However I think it'd be much clearer if we just passed the value of
bl->props.brightness into the callbacks, that way we can avoid the
additional variable.
Thierry
>
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index 057389d..dd4d24d 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -39,6 +39,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
> {
> struct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
> int brightness = bl->props.brightness;
> + int pwm_brightness;
> int max = bl->props.max_brightness;
>
> if (bl->props.power != FB_BLANK_UNBLANK)
> @@ -55,13 +56,14 @@ static int pwm_backlight_update_status(struct backlight_device *bl)
> pwm_disable(pb->pwm);
> } else {
> if (pb->levels) {
> - brightness = pb->levels[brightness];
> + pwm_brightness = pb->levels[brightness];
> max = pb->levels[max];
> - }
> + } else
> + pwm_brightness = brightness;
>
> - brightness = pb->lth_brightness +
> - (brightness * (pb->period - pb->lth_brightness) / max);
> - pwm_config(pb->pwm, brightness, pb->period);
> + pwm_brightness = pb->lth_brightness +
> + (pwm_brightness * (pb->period - pb->lth_brightness) / max);
> + pwm_config(pb->pwm, pwm_brightness, pb->period);
> pwm_enable(pb->pwm);
> }
>
> --
> 1.7.11.1
>
>
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