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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2016-05-09 13:42:32 +0300
committerMark Brown <broonie@kernel.org>2016-05-09 18:55:16 +0300
commitddecd1492de476488a92493510fb86c6ffe9acbd (patch)
tree2dc09ed782ab53866be2e5ddecf54bca01e9f903 /sound/soc/davinci
parent3e9bee11d83190b852d428b3e35a942c6e2293cd (diff)
downloadlinux-ddecd1492de476488a92493510fb86c6ffe9acbd.tar.xz
ASoC: davinci-mcasp: Calculate AUXCLK divider when setting up master clocks
If the McASP is used as clock master and the reference clock is AUXCLK we can have additional level of divider. The BCLK divider is limited to maximum 32, if the desired bclk can not be reached with this, the AUXCLK divider also needs to be used. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/davinci')
-rw-r--r--sound/soc/davinci/davinci-mcasp.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 58fe112c5335..f390bb449c48 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -1003,13 +1003,31 @@ static int davinci_mcasp_calc_clk_div(struct davinci_mcasp *mcasp,
unsigned int bclk_freq, bool set)
{
int error_ppm;
- int div = mcasp->sysclk_freq / bclk_freq;
- int rem = mcasp->sysclk_freq % bclk_freq;
+ unsigned int sysclk_freq = mcasp->sysclk_freq;
+ u32 reg = mcasp_get_reg(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG);
+ int div = sysclk_freq / bclk_freq;
+ int rem = sysclk_freq % bclk_freq;
+ int aux_div = 1;
+
+ if (div > (ACLKXDIV_MASK + 1)) {
+ if (reg & AHCLKXE) {
+ aux_div = div / (ACLKXDIV_MASK + 1);
+ if (div % (ACLKXDIV_MASK + 1))
+ aux_div++;
+
+ sysclk_freq /= aux_div;
+ div = sysclk_freq / bclk_freq;
+ rem = sysclk_freq % bclk_freq;
+ } else if (set) {
+ dev_warn(mcasp->dev, "Too fast reference clock (%u)\n",
+ sysclk_freq);
+ }
+ }
if (rem != 0) {
if (div == 0 ||
- ((mcasp->sysclk_freq / div) - bclk_freq) >
- (bclk_freq - (mcasp->sysclk_freq / (div+1)))) {
+ ((sysclk_freq / div) - bclk_freq) >
+ (bclk_freq - (sysclk_freq / (div+1)))) {
div++;
rem = rem - bclk_freq;
}
@@ -1023,6 +1041,9 @@ static int davinci_mcasp_calc_clk_div(struct davinci_mcasp *mcasp,
error_ppm);
__davinci_mcasp_set_clkdiv(mcasp, MCASP_CLKDIV_BCLK, div, 0);
+ if (reg & AHCLKXE)
+ __davinci_mcasp_set_clkdiv(mcasp, MCASP_CLKDIV_AUXCLK,
+ aux_div, 0);
}
return error_ppm;