diff options
| -rw-r--r-- | sound/soc/codecs/rl6231.c | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/sound/soc/codecs/rl6231.c b/sound/soc/codecs/rl6231.c index 57e51c16e021..aca479fa7670 100644 --- a/sound/soc/codecs/rl6231.c +++ b/sound/soc/codecs/rl6231.c @@ -62,31 +62,31 @@ int rl6231_get_pre_div(struct regmap *map, unsigned int reg, int sft) EXPORT_SYMBOL_GPL(rl6231_get_pre_div); /** - * rl6231_calc_dmic_clk - Calculate the parameter of dmic. + * rl6231_calc_dmic_clk - Calculate the frequency divider parameter of dmic. * * @rate: base clock rate. * - * Choose dmic clock between 1MHz and 3MHz. - * It is better for clock to approximate 3MHz. + * Choose divider parameter that gives the highest possible DMIC frequency in + * 1MHz - 3MHz range. */ int rl6231_calc_dmic_clk(int rate) { - int div[] = {2, 3, 4, 6, 8, 12}, idx = -EINVAL; - int i, red, bound, temp; + int div[] = {2, 3, 4, 6, 8, 12}; + int i; + + if (rate < 1000000 * div[0]) { + pr_warn("Base clock rate %d is too low\n", rate); + return -EINVAL; + } - red = 3000000 * 12; for (i = 0; i < ARRAY_SIZE(div); i++) { - bound = div[i] * 3000000; - if (rate > bound) - continue; - temp = bound - rate; - if (temp < red) { - red = temp; - idx = i; - } + /* find divider that gives DMIC frequency below 3MHz */ + if (3000000 * div[i] >= rate) + return i; } - return idx; + pr_warn("Base clock rate %d is too high\n", rate); + return -EINVAL; } EXPORT_SYMBOL_GPL(rl6231_calc_dmic_clk); |