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https://github.com/AsahiLinux/u-boot
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c059f274ad
First, the "div" value was being used incorrectly to compute the frequency of the PWM timer. The value passed in is a constant which reflects the value that would be found in a configuration register, 0 to 4. That should correspond to a scaling factor of 1, 2, 4, 8, or 16, 1 << div, but div + 1 was being used instead. Second, the reset value of the timers were being calculated to give an overall frequency, thrown out, and set to a maximum value. This was done so that PWM 4 could be used as the system clock by counting down from a high value, but it was applied indiscriminantly. It should at most be applied only to PWM 4. This change also takes the opportunity to tidy up the pwm_init function. Test with command "sf probe 1:0; time sf read 40008000 0 1000". Try with different numbers of bytes and see that sane values are obtained Build and boot U-boot with this patch, backlight works properly. Signed-off-by: Gabe Black <gabeblack@google.com> Signed-off-by: Akshay Saraswat <akshay.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com> |
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| arm720t | ||
| arm920t | ||
| arm925t | ||
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| arm1136 | ||
| arm1176 | ||
| arm_intcm | ||
| armv7 | ||
| ixp | ||
| pxa | ||
| s3c44b0 | ||
| sa1100 | ||
| tegra-common | ||
| tegra20-common | ||
| tegra30-common | ||
| tegra114-common | ||
| u-boot-spl.lds | ||
| u-boot.lds | ||