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intel/broadwell: Correct backlight-PWM divider 

The PWM-granularity chicken bit in the Wildcat Point and Lynx Point
PCHs has actually the opposite meaning of the one for Sunrise Point
and later. When the bit is set, we get a divider of 16, when it's
unset 128. Flip the bit!

Change-Id: I1dbde1915d8b269c11643a1636565a560eb07334
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39770
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Nico Huber 2020-03-23 01:33:23 +01:00
parent 53ec8c5722
commit e47132be66
1 changed files with 2 additions and 2 deletions
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4
src/soc/intel/broadwell/igd.c
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@ -348,10 +348,10 @@ static void igd_setup_panel(struct device *dev)
south_chicken2 = gtt_read(SOUTH_CHICKEN2);
if (conf->gpu_pch_backlight_pwm_hz > hz_limit) {
pwm_increment = 16;
south_chicken2 &= ~(1 << 5);
south_chicken2 |= 1 << 5;
} else {
pwm_increment = 128;
south_chicken2 |= 1 << 5;
south_chicken2 &= ~(1 << 5);
}
gtt_write(SOUTH_CHICKEN2, south_chicken2);