>>>>> "Hans" == Hans de Goede <hdego...@redhat.com> writes:
> When the backlight's pwm input is connected to a pwm output of the SoC, > actually use pwm to drive the backlight. > The mean reason for doing this is to fix the backlight turning off > for aprox. 1 second while the kernel is booting. This is caused by > the kernel actually using pwm to drive the backlight, so that it > can dim the backlight. First the pwm driver loads and switches the > pinmux for the pin driving the backlight's pwm input to the pwm > controller. Then about 1s later the actual backlight driver loads > and tells the pwm driver to actually update the pwm settings, which > have a power-on-reset value of "off". > An additional advantage is that this allows us to initatiate the > backlight at 80%, which is the kernel default, avoiding a brightness > change while the kernel loads. > +++ b/drivers/video/sunxi_display.c > @@ -12,6 +12,7 @@ > #include <asm/arch/clock.h> > #include <asm/arch/display.h> > #include <asm/arch/gpio.h> > +#include <asm/arch/pwm.h> > #include <asm/global_data.h> > #include <asm/gpio.h> > #include <asm/io.h> > @@ -34,7 +35,6 @@ > #define PWM_ON 1 > #define PWM_OFF 0 > #endif > - Unrelated white space change. Other than that: Reviewed by: Peter Korsgaard <pe...@korsgaard.com> -- Bye, Peter Korsgaard _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
