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authorGabe Black <gabeblack@google.com>2013-03-28 04:32:18 +0000
committerMinkyu Kang <mk7.kang@samsung.com>2013-04-01 14:02:08 +0900
commitc059f274ade1a5f7d1f39927d8b31a41cba9034c (patch)
treef1b87289d425e6b2696bbd5aebe0e5048537b914 /fs/sandbox
parentf24869d3a8f6646c2d207057719e6fa0a8f31eb0 (diff)
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Exynos: pwm: Fix two bugs in the exynos pwm configuration code
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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