mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 05:04:09 +08:00
ASoC: bcm2835: fix hw_params error when device is in prepared state
If bcm2835 is configured as bitclock master calling hw_params() after prepare() fails with EBUSY. This also makes it impossible to use bcm2835 in full duplex mode. The error is caused by the split clock setup: clk_set_rate is called in hw_params, clk_prepare_enable in prepare. As hw_params doesn't check if the clock was already enabled clk_set_rate fails with EBUSY. Fix this by moving clock startup from prepare to hw_params and let hw_params properly deal with an already set up or enabled clock. Signed-off-by: Matthias Reichl <hias@horus.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
parent
4fbd8d194f
commit
8d5737a5f5
@ -130,6 +130,7 @@ struct bcm2835_i2s_dev {
|
||||
struct regmap *i2s_regmap;
|
||||
struct clk *clk;
|
||||
bool clk_prepared;
|
||||
int clk_rate;
|
||||
};
|
||||
|
||||
static void bcm2835_i2s_start_clock(struct bcm2835_i2s_dev *dev)
|
||||
@ -419,10 +420,19 @@ static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
|
||||
}
|
||||
|
||||
/* Clock should only be set up here if CPU is clock master */
|
||||
if (bit_clock_master) {
|
||||
ret = clk_set_rate(dev->clk, bclk_rate);
|
||||
if (ret)
|
||||
return ret;
|
||||
if (bit_clock_master &&
|
||||
(!dev->clk_prepared || dev->clk_rate != bclk_rate)) {
|
||||
if (dev->clk_prepared)
|
||||
bcm2835_i2s_stop_clock(dev);
|
||||
|
||||
if (dev->clk_rate != bclk_rate) {
|
||||
ret = clk_set_rate(dev->clk, bclk_rate);
|
||||
if (ret)
|
||||
return ret;
|
||||
dev->clk_rate = bclk_rate;
|
||||
}
|
||||
|
||||
bcm2835_i2s_start_clock(dev);
|
||||
}
|
||||
|
||||
/* Setup the frame format */
|
||||
@ -618,8 +628,6 @@ static int bcm2835_i2s_prepare(struct snd_pcm_substream *substream,
|
||||
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
||||
uint32_t cs_reg;
|
||||
|
||||
bcm2835_i2s_start_clock(dev);
|
||||
|
||||
/*
|
||||
* Clear both FIFOs if the one that should be started
|
||||
* is not empty at the moment. This should only happen
|
||||
|
Loading…
Reference in New Issue
Block a user