[ALSA] ASoC: Add support for BCLK based on (Rate * Chn * Word Size)

This patch adds support for the DAI BCLK to be generated by multiplying
Rate * Channels * Word Size (RCW).
This now gives 3 options for BCLK clocking and synchronisation :-
 1. BCLK = Rate * x
 2. BCLK = MCLK / x
 3. BCLK = Rate * Chn * Word Size.  (New)
Changes:-
 o Add support for RCW generation of BCLK
 o Update Documentation to include RCW.
 o Update DAI documentation for label = value DAI modes.
 o Add RCW support to wm8731, wm8750 and pxa2xx-i2s drivers.

Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 6 insertions, 9 deletions

diff --git a/sound/soc/codecs/wm8750.c b/sound/soc/codecs/wm8750.c
index 243da712d9c1..c5d13a9454d9 100644
--- a/sound/soc/codecs/wm8750.c
+++ b/sound/soc/codecs/wm8750.c
@@ -343,7 +343,7 @@ static struct snd_soc_dai_mode wm8750_modes[] = {
                 .pcmdir = WM8750_DIR,
                 .flags = SND_SOC_DAI_BFS_DIV,
                 .fs = SND_SOC_FS_ALL,
-                .bfs = SND_SOC_FSBD_ALL,
+                .bfs = SND_SOC_FSB_ALL,
         },
 };
 
@@ -829,6 +829,9 @@ static inline int get_coeff(int mclk, int rate)
                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
                         return i;
         }
+
+        printk(KERN_ERR "wm8750: could not get coeff for mclk %d @ rate %d\n",
+                mclk, rate);
         return -EINVAL;
 }
 
@@ -836,13 +839,7 @@ static inline int get_coeff(int mclk, int rate)
 static unsigned int wm8750_config_sysclk(struct snd_soc_codec_dai *dai,
         struct snd_soc_clock_info *info, unsigned int clk)
 {
-        dai->mclk = 0;
-
-        /* check that the calculated FS and rate actually match a clock from
-         * the machine driver */
-        if (info->fs * info->rate == clk)
-                dai->mclk = clk;
-
+        dai->mclk = clk;
         return dai->mclk;
 }
 
@@ -859,7 +856,7 @@ static int wm8750_pcm_prepare(struct snd_pcm_substream *substream)
         if (i < 0)
                 return i;
 
-        bfs = SND_SOC_FSB_REAL(rtd->codec_dai->dai_runtime.bfs);
+        bfs = SND_SOC_FSBD_REAL(rtd->codec_dai->dai_runtime.bfs);
 
         /* set master/slave audio interface */
         switch (rtd->codec_dai->dai_runtime.fmt & SND_SOC_DAIFMT_CLOCK_MASK) {