diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/intel/broadwell/gma.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/soc/intel/broadwell/gma.c b/src/soc/intel/broadwell/gma.c index ba453cdb27..8ccd2783c7 100644 --- a/src/soc/intel/broadwell/gma.c +++ b/src/soc/intel/broadwell/gma.c @@ -281,7 +281,7 @@ int gtt_poll(u32 reg, u32 mask, u32 value) return 0; } -static void igd_setup_panel(struct device *dev) +static void gma_setup_panel(struct device *dev) { config_t *conf = config_of(dev); u32 reg32; @@ -326,7 +326,8 @@ static void igd_setup_panel(struct device *dev) Reference clock is 24MHz. We can choose either a 16 or a 128 step increment. Use 16 if we would have less than 100 steps otherwise. */ - const unsigned int hz_limit = 24 * 1000 * 1000 / 128 / 100; + const unsigned int refclock = 24 * MHz; + const unsigned int hz_limit = refclock / 128 / 100; unsigned int pwm_increment, pwm_period; u32 south_chicken2; @@ -340,7 +341,12 @@ static void igd_setup_panel(struct device *dev) } gtt_write(SOUTH_CHICKEN2, south_chicken2); - pwm_period = 24 * 1000 * 1000 / pwm_increment / conf->gpu_pch_backlight_pwm_hz; + pwm_period = refclock / pwm_increment / conf->gpu_pch_backlight_pwm_hz; + printk(BIOS_INFO, + "GMA: Setting backlight PWM frequency to %uMHz / %u / %u = %uHz\n", + refclock / MHz, pwm_increment, pwm_period, + DIV_ROUND_CLOSEST(refclock, pwm_increment * pwm_period)); + /* Start with a 50% duty cycle. */ gtt_write(BLC_PWM_PCH_CTL2, pwm_period << 16 | pwm_period / 2); @@ -532,7 +538,7 @@ static void igd_init(struct device *dev) gtt_write(0xa008, rp1_gfx_freq << 24); /* Post VBIOS panel setup */ - igd_setup_panel(dev); + gma_setup_panel(dev); /* Initialize PCI device, load/execute BIOS Option ROM */ pci_dev_init(dev); |