diff options
Diffstat (limited to 'src/northbridge/intel/gm45/gma.c')
| -rw-r--r-- | src/northbridge/intel/gm45/gma.c | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/src/northbridge/intel/gm45/gma.c b/src/northbridge/intel/gm45/gma.c index 6ba43a26c0..c060bb0be7 100644 --- a/src/northbridge/intel/gm45/gma.c +++ b/src/northbridge/intel/gm45/gma.c @@ -653,12 +653,16 @@ static u32 freq_to_blc_pwm_ctl(struct device *const dev, return (blc_mod << 16) | blc_mod; } -static void gma_pm_init_post_vbios(struct device *const dev) +static void gma_pm_init_post_vbios(struct device *const dev, + const char *edid_ascii_string) { const struct northbridge_intel_gm45_config *const conf = dev->chip_info; u32 reg32; u8 reg8; + const struct blc_pwm_t *blc_pwm; + int blc_array_len, i; + u16 pwm_freq = 0; /* Setup Panel Power On Delays */ reg32 = gtt_read(PP_ON_DELAYS); @@ -689,11 +693,35 @@ static void gma_pm_init_post_vbios(struct device *const dev) reg8 = 100; if (conf->duty_cycle != 0) reg8 = conf->duty_cycle; - if (conf->pwm_freq == 0) + blc_array_len = get_blc_values(&blc_pwm); + if (conf->default_pwm_freq != 0) + pwm_freq = conf->default_pwm_freq; + + /* Find EDID string and pwm freq in lookup table */ + for (i = 0; i < blc_array_len; i++) { + if (!strncmp(blc_pwm[i].ascii_string, edid_ascii_string, + strlen(blc_pwm[i].ascii_string))) { + pwm_freq = blc_pwm[i].pwm_freq; + printk(BIOS_DEBUG, "Found EDID string: %s in lookup table, pwm: %dHz\n", + blc_pwm[i].ascii_string, pwm_freq); + break; + } + } + + if (i == blc_array_len) + printk(BIOS_NOTICE, "Your panels EDID `%s` wasn't found in the" + "lookup table.\n You may have issues with your panels" + "backlight.\n If you want to help improving coreboot" + "please report: this EDID string\n and the result" + "of `intel_read read BLC_PWM_CTL`" + "(from intel-gpu-tools)\n while running vendor BIOS\n", + edid_ascii_string); + + if (pwm_freq == 0) gtt_write(BLC_PWM_CTL, 0x06100610); else - gtt_write(BLC_PWM_CTL, freq_to_blc_pwm_ctl(dev, - conf->pwm_freq, reg8)); + gtt_write(BLC_PWM_CTL, freq_to_blc_pwm_ctl(dev, pwm_freq, + reg8)); } static void gma_func0_init(struct device *dev) @@ -726,7 +754,7 @@ static void gma_func0_init(struct device *dev) decode_edid(edid_data_lvds, sizeof(edid_data_lvds), &edid_lvds); /* Post VBIOS init */ - gma_pm_init_post_vbios(dev); + gma_pm_init_post_vbios(dev, edid_lvds.ascii_string); if (IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT)) gma_ngi(dev, &edid_lvds); |