On Thu, 22 Feb 2018, Daniel Thompson <daniel.thomp...@linaro.org> 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.bez...@microchip.com> >> --- >> 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