Hi Akshay,
On Thu, Feb 28, 2013 at 2:59 AM, Akshay Saraswat akshay.s@samsung.com wrote:
Use generic api to get the pwm clock frequency
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: Padmavathi Venna padma.v@samsung.com Signed-off-by: Akshay Saraswat akshay.s@samsung.com
Acked-by: Simon Glass sjg@chromium.org
(I don't think SPI flash (the sf probe) is related to this test)
Changes since v1: - Restored get_pwm_clk call in case of non-exynos5 cpu.
arch/arm/cpu/armv7/s5p-common/pwm.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/arm/cpu/armv7/s5p-common/pwm.c b/arch/arm/cpu/armv7/s5p-common/pwm.c index 6f401b8..f5e9a95 100644 --- a/arch/arm/cpu/armv7/s5p-common/pwm.c +++ b/arch/arm/cpu/armv7/s5p-common/pwm.c @@ -28,6 +28,7 @@ #include <asm/io.h> #include <asm/arch/pwm.h> #include <asm/arch/clk.h> +#include <asm/arch/periph.h>
int pwm_enable(int pwm_id) { @@ -60,7 +61,10 @@ static unsigned long pwm_calc_tin(int pwm_id, unsigned long freq) unsigned long tin_parent_rate; unsigned int div;
tin_parent_rate = get_pwm_clk();
if (cpu_is_exynos5())tin_parent_rate = clock_get_periph_rate(PERIPH_ID_PWM0);elsetin_parent_rate = get_pwm_clk(); for (div = 2; div <= 16; div *= 2) { if ((tin_parent_rate / (div << 16)) < freq)@@ -165,8 +169,15 @@ int pwm_init(int pwm_id, int div, int invert) ticks_per_period = -1UL; } else { const unsigned long pwm_hz = 1000;
unsigned long timer_rate_hz = get_pwm_clk() /((prescaler + 1) * (1 << div));
unsigned long timer_rate_hz;if (cpu_is_exynos5()) {timer_rate_hz = clock_get_periph_rate(PERIPH_ID_PWM0)/ ((prescaler + 1) * (1 << div));} else {timer_rate_hz = get_pwm_clk() /((prescaler + 1) * (1 << div));} ticks_per_period = timer_rate_hz / pwm_hz; }-- 1.8.0