Commit 24ccea1c authored Mar 11, 2015 by Gaetan Hug Committed by Thierry Reding Mar 11, 2015

pwm: mxs: Fix period divider computation



The driver computes which clock divider it sould be using from the
requested period. This computation assumes that the link between the
register value and the actual divider value is raising 2 to the power of
the registry value.

    div = 1 << regvalue

This is true only for the first 5 values out of 8. Next values are 64,
256 and, 1024 - instead of 32, 64, 128.
This affects only the users requesting a period > 0.04369s.

Replace the computation with a look-up table.

Signed-off-by: Gaetan Hug <ghug@induct.be>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

parent 054d3e1f

drivers/pwm/pwm-mxs.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -35,6 +35,10 @@
		#define PERIOD_CDIV(div) (((div) & 0x7) << 20)
		#define PERIOD_CDIV_MAX 8

		static const unsigned int cdiv[PERIOD_CDIV_MAX] = {
		1, 2, 4, 8, 16, 64, 256, 1024
		};

		struct mxs_pwm_chip {
		struct pwm_chip chip;
		struct clk *clk;
		@@ -54,13 +58,13 @@ static int mxs_pwm_config(struct pwm_chip chip, struct pwm_device pwm,

		rate = clk_get_rate(mxs->clk);
		while (1) {
		c = rate / (1 << div);
		c = rate / cdiv[div];
		c = c * period_ns;
		do_div(c, 1000000000);
		if (c < PERIOD_PERIOD_MAX)
		break;
		div++;
		if (div > PERIOD_CDIV_MAX)
		if (div >= PERIOD_CDIV_MAX)
		return -EINVAL;
		}