On Thu, 22 Feb 2018, Daniel Thompson <daniel.thompson@xxxxxxxxxx> wrote:
> On Thu, Feb 22, 2018 at 02:01:16PM +0200, Claudiu Beznea wrote:
>> Add PWM mode to pwm_config() function. The drivers which uses pwm_config()
>> were adapted to this change.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
>> ---
>> arch/arm/mach-s3c24xx/mach-rx1950.c | 11 +++++++++--
>> drivers/bus/ts-nbus.c | 2 +-
>> drivers/clk/clk-pwm.c | 3 ++-
>> drivers/gpu/drm/i915/intel_panel.c | 17 ++++++++++++++---
>> drivers/hwmon/pwm-fan.c | 2 +-
>> drivers/input/misc/max77693-haptic.c | 2 +-
>> drivers/input/misc/max8997_haptic.c | 6 +++++-
>> drivers/leds/leds-pwm.c | 5 ++++-
>> drivers/media/rc/ir-rx51.c | 5 ++++-
>> drivers/media/rc/pwm-ir-tx.c | 5 ++++-
>> drivers/video/backlight/lm3630a_bl.c | 4 +++-
>> drivers/video/backlight/lp855x_bl.c | 4 +++-
>> drivers/video/backlight/lp8788_bl.c | 5 ++++-
>> drivers/video/backlight/pwm_bl.c | 11 +++++++++--
>> drivers/video/fbdev/ssd1307fb.c | 3 ++-
>> include/linux/pwm.h | 6 ++++--
>> 16 files changed, 70 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
>> index 2030a6b77a09..696fa25dafd2 100644
>> --- a/drivers/video/backlight/lm3630a_bl.c
>> +++ b/drivers/video/backlight/lm3630a_bl.c
>> @@ -165,8 +165,10 @@ static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
>> {
>> unsigned int period = pchip->pdata->pwm_period;
>> unsigned int duty = br * period / br_max;
>> + struct pwm_caps caps = { };
>>
>> - pwm_config(pchip->pwmd, duty, period);
>> + pwm_get_caps(pchip->pwmd->chip, pchip->pwmd, &caps);
>> + pwm_config(pchip->pwmd, duty, period, BIT(ffs(caps.modes) - 1));
>
> Well... I admit I've only really looked at the patches that impact
> backlight but dispersing this really odd looking bit twiddling
> throughout the kernel doesn't strike me a great API design.
>
> IMHO callers should not be required to find the first set bit in
> some specially crafted set of capability bits simply to get sane
> default behaviour.
Agreed. IMHO the regular use case becomes rather tedious, ugly, and
error prone.
BR,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
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