diff options
| author | Nicolin Chen <Guangyu.Chen@freescale.com> | 2014-07-23 19:23:38 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-07-25 18:52:35 +0100 |
| commit | f4075a8f452aff5465c6522c92da9db71ed11b7f (patch) | |
| tree | 3f2b3e6eb22153c8a27e84abcb76d92c1dbbe058 /sound/soc/fsl/fsl_sai.c | |
| parent | 4800f88b615f194ae3c1577038a7ccd871c907c9 (diff) | |
ASoC: fsl_sai: Reduce race condition during TE/RE enabling
For trigger start, we don't need to check if it's the first time to
enable TE/RE or second time. It doesn't hurt to enable them any way,
which in the meantime can reduce race condition for TE/RE enabling.
For trigger stop, we will definitely clear FRDE of current direction.
Thus the driver only needs to read the opposite one's.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc/fsl/fsl_sai.c')
| -rw-r--r-- | sound/soc/fsl/fsl_sai.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index 1b6ee2ce849f..a437899d2d11 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -327,7 +327,7 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd, { struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; - u32 tcsr, rcsr; + u32 xcsr; /* * The transmitter bit clock and frame sync are to be @@ -338,9 +338,6 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd, regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC, FSL_SAI_CR2_SYNC); - regmap_read(sai->regmap, FSL_SAI_TCSR, &tcsr); - regmap_read(sai->regmap, FSL_SAI_RCSR, &rcsr); - /* * It is recommended that the transmitter is the last enabled * and the first disabled. @@ -349,12 +346,10 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd, case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - if (!(tcsr & FSL_SAI_CSR_FRDE || rcsr & FSL_SAI_CSR_FRDE)) { - regmap_update_bits(sai->regmap, FSL_SAI_RCSR, - FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE); - regmap_update_bits(sai->regmap, FSL_SAI_TCSR, - FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE); - } + regmap_update_bits(sai->regmap, FSL_SAI_RCSR, + FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE); + regmap_update_bits(sai->regmap, FSL_SAI_TCSR, + FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE); regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx), FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS); @@ -370,7 +365,8 @@ static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd, FSL_SAI_CSR_xIE_MASK, 0); /* Check if the opposite FRDE is also disabled */ - if (!(tx ? rcsr & FSL_SAI_CSR_FRDE : tcsr & FSL_SAI_CSR_FRDE)) { + regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr); + if (!(xcsr & FSL_SAI_CSR_FRDE)) { /* Disable both directions and reset their FIFOs */ regmap_update_bits(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_TERE | FSL_SAI_CSR_FR, |