Arthur Heymans (arthur@aheymans.xyz) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18191
-gerrit
commit 1326565a9066afcd694ba339e95078d5c783bfe6 Author: Arthur Heymans arthur@aheymans.xyz Date: Fri Jan 20 17:36:20 2017 +0100
Allow to set pwm frequency from cmos.
Change-Id: I968ff3548a732c08ab51d764d0f7311f3bbce620 Signed-off-by: Arthur Heymans arthur@aheymans.xyz --- src/mainboard/lenovo/x200/cmos.layout | 1 + src/northbridge/intel/gm45/gma.c | 32 +++++++++++++++++++++++--------- 2 files changed, 24 insertions(+), 9 deletions(-)
diff --git a/src/mainboard/lenovo/x200/cmos.layout b/src/mainboard/lenovo/x200/cmos.layout index 35d5017..e77aa5e 100644 --- a/src/mainboard/lenovo/x200/cmos.layout +++ b/src/mainboard/lenovo/x200/cmos.layout @@ -79,6 +79,7 @@ entries # coreboot config options: northbridge 944 8 h 0 volume 952 4 e 11 gfx_uma_size +956 13 h 0 pwm_freq
# coreboot config options: check sums 984 16 h 0 check_sum diff --git a/src/northbridge/intel/gm45/gma.c b/src/northbridge/intel/gm45/gma.c index 4886bb2..a91a8a2 100644 --- a/src/northbridge/intel/gm45/gma.c +++ b/src/northbridge/intel/gm45/gma.c @@ -34,6 +34,7 @@ #include <drivers/intel/gma/i915.h> #include <pc80/vga.h> #include <pc80/vga_io.h> +#include <pc80/mc146818rtc.h>
#define BASE_FREQUENCY 96000
@@ -646,7 +647,8 @@ static void gma_pm_init_post_vbios(struct device *const dev) const struct northbridge_intel_gm45_config *const conf = dev->chip_info;
u32 reg32; - u8 reg8; + u8 duty; + u16 pwm_freq;
/* Setup Panel Power On Delays */ reg32 = gtt_read(PP_ON_DELAYS); @@ -674,14 +676,26 @@ static void gma_pm_init_post_vbios(struct device *const dev)
/* Enable Backlight */ gtt_write(BLC_PWM_CTL2, (1 << 31)); - reg8 = 100; - if (conf->duty_cycle != 0) - reg8 = conf->duty_cycle; - if (conf->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)); + + reg32 = 0x06100610; + duty = 100; + pwm_freq = 0; + if (conf->duty_cycle) + duty = conf->duty_cycle; + + if (conf->pwm_freq) + pwm_freq = conf->pwm_freq; + get_option(&pwm_freq, "pwm_freq"); + /* Check for sanity of cmos value */ + if (pwm_freq < 50) { + printk(BIOS_DEBUG, + "PWM freq below treshhold, using default value\n"); + pwm_freq = conf->pwm_freq; + } + + if (pwm_freq) + reg32 = freq_to_blc_pwm_ctl(dev, pwm_freq, duty); + gtt_write(BLC_PWM_CTL, reg32); }
static void gma_func0_init(struct device *dev)