On Fri, Nov 11, 2011 at 02:12:58PM -0800, Simon Que wrote: > If the firmware did not initialize the backlight PWM registers, set up a > default PWM frequency of 200 Hz. This is determined using the following > formula: > > freq = refclk / (128 * pwm_max) > > The PWM register allows the max PWM value to be set. So we want to use > the formula, where freq = 200: > > pwm_max = refclk / (128 * freq) > > This patch will, in the case of missing PWM register initialization > values, look for the reference clock frequency. Based on that, it sets > an appropriate max PWM value for a frequency of 200 Hz. > > If no refclk frequency is found, the max PWM will be zero, which results > in no change to the PWM registers. > > Signed-off-by: Simon Que <[email protected]>
Acked-by: Olof Johansson <[email protected]> Looks much better. I'm OK with this solution. Matthew? -Olof _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
