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| author | Gaetan Hug <ghug@induct.be> | 2015-03-11 13:08:12 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2015-03-11 13:11:16 +0100 |
| commit | 24ccea1ce6717b91bb1e71b12cfd956f8d32dcf3 (patch) | |
| tree | 931a34a00fc38bc38ee9367a0b47ceaa3c7dcb0b /drivers/pwm | |
| parent | 054d3e1f9a995e13b8be07482fe5c1c42655223d (diff) | |
| download | linux-stable-24ccea1ce6717b91bb1e71b12cfd956f8d32dcf3.tar.gz linux-stable-24ccea1ce6717b91bb1e71b12cfd956f8d32dcf3.tar.bz2 linux-stable-24ccea1ce6717b91bb1e71b12cfd956f8d32dcf3.zip | |
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>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-mxs.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c index f75ecb09d97d..b430811e14f5 100644 --- a/drivers/pwm/pwm-mxs.c +++ b/drivers/pwm/pwm-mxs.c @@ -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; } |