The set of supported sample rates depends on the master clock supplied to the codec. Allow the machine driver to set the required master clock in hw_params().

Signed-off-by: Sergej Sawazki ce3a@gmx.de ---

Charles, Mark, thanks for your comments.

This patch has been tested on a board with two master clocks, 22.5792MHz (for 44.1kHz, 88.2kHz, ...) and 24.576MHz (for 48kHz, 96kHz, ...).

Changes since v1 (Suggested by Charles Keepax): - Do not entirely delete the startup() method, just don't set any constraints if there is no SYSCLK configured. - Clear the SYSCLK in set_dai_sysclk() if freq is 0.

Many thanks for your time and effort, Sergej

sound/soc/codecs/wm8741.c | 61 ++++++++++++++++++++--------------------------- 1 file changed, 26 insertions(+), 35 deletions(-)

diff --git a/sound/soc/codecs/wm8741.c b/sound/soc/codecs/wm8741.c index 09ff01f..b346237 100644 --- a/sound/soc/codecs/wm8741.c +++ b/sound/soc/codecs/wm8741.c @@ -125,18 +125,6 @@ static const struct snd_soc_dapm_route wm8741_dapm_routes[] = { { "VOUTRN", NULL, "DACR" }, };

-static struct { - int value; - int ratio; -} lrclk_ratios[WM8741_NUM_RATES] = { - { 1, 128 }, - { 2, 192 }, - { 3, 256 }, - { 4, 384 }, - { 5, 512 }, - { 6, 768 }, -}; - static const unsigned int rates_11289[] = { 44100, 88200, }; @@ -209,25 +197,16 @@ static const struct snd_pcm_hw_constraint_list constraints_36864 = { .list = rates_36864, };

- static int wm8741_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct snd_soc_codec *codec = dai->codec; struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);

- /* The set of sample rates that can be supported depends on the - * MCLK supplied to the CODEC - enforce this. - */ - if (!wm8741->sysclk) { - dev_err(codec->dev, - "No MCLK configured, call set_sysclk() on init\n"); - return -EINVAL; - } - - snd_pcm_hw_constraint_list(substream->runtime, 0, - SNDRV_PCM_HW_PARAM_RATE, - wm8741->sysclk_constraints); + if (wm8741->sysclk) + snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + wm8741->sysclk_constraints);

return 0; } @@ -241,17 +220,24 @@ static int wm8741_hw_params(struct snd_pcm_substream *substream, u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC; int i;

- /* Find a supported LRCLK ratio */ - for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) { - if (wm8741->sysclk / params_rate(params) == - lrclk_ratios[i].ratio) + /* The set of sample rates that can be supported depends on the + * MCLK supplied to the CODEC - enforce this. + */ + if (!wm8741->sysclk) { + dev_err(codec->dev, + "No MCLK configured, call set_sysclk() on init or in hw_params\n"); + return -EINVAL; + } + + /* Find a supported LRCLK rate */ + for (i = 0; i < wm8741->sysclk_constraints->count; i++) { + if (wm8741->sysclk_constraints->list[i] == params_rate(params)) break; }

- /* Should never happen, should be handled by constraints */ - if (i == ARRAY_SIZE(lrclk_ratios)) { - dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n", - wm8741->sysclk / params_rate(params)); + if (i == wm8741->sysclk_constraints->count) { + dev_err(codec->dev, "LRCLK %d unsupported with MCLK %d\n", + params_rate(params), wm8741->sysclk); return -EINVAL; }

@@ -274,8 +260,8 @@ static int wm8741_hw_params(struct snd_pcm_substream *substream, return -EINVAL; }

- dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d", - params_width(params)); + dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d, rate param = %d", + params_width(params), params_rate(params));

snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface); return 0; @@ -290,6 +276,11 @@ static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai, dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);

switch (freq) { + case 0: + wm8741->sysclk_constraints = NULL; + wm8741->sysclk = freq; + return 0; + case 11289600: wm8741->sysclk_constraints = &constraints_11289; wm8741->sysclk = freq;