[PATCH] ASoC: samsung: fix CDCLK handling
ODROID is the only platform that uses CDCLK, and right now,
CDCLK handling is buggy. If you start pulseaudio on ODROID,
audio is broken until reboot (even after killing pulse).
This happens because CDCLK gets disabled by i2s.c and never enabled again.
pulseaudio does:
1. i2s_startup for playback channel
2. i2s_startup for capture channel
3. i2s_shutdown for capture channel
4. i2s_shutdown for playback channel
In step 3 we disable CDCLK even though playback should still be active.
In step 4 we do this:
u32 mod = readl(i2s->addr + I2SMOD);
i2s->cdclk_out = !(mod & MOD_CDCLKCON);
and now cdclk_out is always going to be 0, so we'll never turn it back
on again.
Both this bug and the one that b97c60abf9a tries to fix happened
because of the way that CDCLK handling is painfully split between
platform and i2s drivers.
Simplify the situation and solve the bug with the following approach:
- as before, samsung_i2s_dai_probe() gates CDCLK by default
(no need for smartq_wm8987 to do this as well)
- platform drivers can gate/ungate CDCLK as necessary
(currently only odroidx2 needs to do this)
- i2s code has no other interaction with CDCLK
Signed-off-by: Daniel Drake
---
sound/soc/samsung/i2s.c | 19 ++
sound/soc/samsung/odroidx2_max98090.c | 36 ++-
sound/soc/samsung/smartq_wm8987.c | 6 --
3 files changed, 29 insertions(+), 32 deletions(-)
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index 9d51347..6654ce6 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -68,8 +68,6 @@ struct i2s_dai {
#define DAI_OPENED (1 << 0) /* Dai is opened */
#define DAI_MANAGER(1 << 1) /* Dai is the manager */
unsigned mode;
- /* CDCLK pin direction: 0 - input, 1 - output */
- unsigned int cdclk_out:1;
/* Driver for this DAI */
struct snd_soc_dai_driver i2s_dai_drv;
/* DMA parameters */
@@ -739,9 +737,6 @@ static int i2s_startup(struct snd_pcm_substream *substream,
spin_unlock_irqrestore(&lock, flags);
- if (!is_opened(other) && i2s->cdclk_out)
- i2s_set_sysclk(dai, SAMSUNG_I2S_CDCLK,
- 0, SND_SOC_CLOCK_OUT);
return 0;
}
@@ -757,24 +752,14 @@ static void i2s_shutdown(struct snd_pcm_substream
*substream,
i2s->mode &= ~DAI_OPENED;
i2s->mode &= ~DAI_MANAGER;
- if (is_opened(other)) {
+ if (is_opened(other))
other->mode |= DAI_MANAGER;
- } else {
- u32 mod = readl(i2s->addr + I2SMOD);
- i2s->cdclk_out = !(mod & MOD_CDCLKCON);
- if (other)
- other->cdclk_out = i2s->cdclk_out;
- }
+
/* Reset any constraint on RFS and BFS */
i2s->rfs = 0;
i2s->bfs = 0;
spin_unlock_irqrestore(&lock, flags);
-
- /* Gate CDCLK by default */
- if (!is_opened(other))
- i2s_set_sysclk(dai, SAMSUNG_I2S_CDCLK,
- 0, SND_SOC_CLOCK_IN);
}
static int config_setup(struct i2s_dai *i2s)
diff --git a/sound/soc/samsung/odroidx2_max98090.c
b/sound/soc/samsung/odroidx2_max98090.c
index 278edf9..b700284 100644
--- a/sound/soc/samsung/odroidx2_max98090.c
+++ b/sound/soc/samsung/odroidx2_max98090.c
@@ -21,20 +21,37 @@ struct odroidx2_drv_data {
/* The I2S CDCLK output clock frequency for the MAX98090 codec */
#define MAX98090_MCLK 1920
+static int odroidx2_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+ if (rtd->cpu_dai->active)
+ return 0;
+
+ return snd_soc_dai_set_sysclk(rtd->cpu_dai, SAMSUNG_I2S_CDCLK,
+ 0, SND_SOC_CLOCK_OUT);
+}
+
+static void odroidx2_shutdown(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+ if (!rtd->cpu_dai->active)
+ snd_soc_dai_set_sysclk(rtd->cpu_dai, SAMSUNG_I2S_CDCLK,
+ 0, SND_SOC_CLOCK_IN);
+}
+
+static const struct snd_soc_ops odroidx2_ops = {
+ .startup = odroidx2_startup,
+ .shutdown = odroidx2_shutdown,
+};
+
static int odroidx2_late_probe(struct snd_soc_card *card)
{
struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
- struct snd_soc_dai *cpu_dai = card->rtd[0].cpu_dai;
- int ret;
- ret = snd_soc_dai_set_sysclk(codec_dai, 0, MAX98090_MCLK,
+ return snd_soc_dai_set_sysclk(codec_dai, 0, MAX98090_MCLK,
SND_SOC_CLOCK_IN);
- if (ret < 0)
- return ret;
-
- /* Set the cpu DAI configuration in order to use CDCLK */
- return snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_CDCLK,
- 0, SND_SOC_CLOCK_OUT);
}
static const struct snd_soc_dapm_widget odroidx2_dapm
Re: [PATCH] ASoC: samsung: fix CDCLK handling
[dropping unrelated addresses from Cc] On 30/09/14 18:40, Daniel Drake wrote: > ODROID is the only platform that uses CDCLK, and right now, > CDCLK handling is buggy. If you start pulseaudio on ODROID, > audio is broken until reboot (even after killing pulse). > > This happens because CDCLK gets disabled by i2s.c and never enabled again. > > pulseaudio does: > 1. i2s_startup for playback channel > 2. i2s_startup for capture channel > 3. i2s_shutdown for capture channel > 4. i2s_shutdown for playback channel > > In step 3 we disable CDCLK even though playback should still be active. > > In step 4 we do this: > u32 mod = readl(i2s->addr + I2SMOD); > i2s->cdclk_out = !(mod & MOD_CDCLKCON); > > and now cdclk_out is always going to be 0, so we'll never turn it back > on again. Sorry for getting back late to this. Indeed we have a mess here. I mostly tested interaction between two CPU DAIs - the main and the overlay one (which is not supported in mainline yet). > Both this bug and the one that b97c60abf9a tries to fix happened > because of the way that CDCLK handling is painfully split between > platform and i2s drivers. > > Simplify the situation and solve the bug with the following approach: > - as before, samsung_i2s_dai_probe() gates CDCLK by default >(no need for smartq_wm8987 to do this as well) > - platform drivers can gate/ungate CDCLK as necessary >(currently only odroidx2 needs to do this) > - i2s code has no other interaction with CDCLK I'm not an ASoC expert, but I'd say it would be better to modify the I2S module so there is no additional callbacks needed in the machine driver. This way all machine drivers using the CDCLK output could be simplified, not mentioning using simple-card. I'm not sure how to do it yet, I'm going to take a look at this over the weekend. -- Regards, Sylwester -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] ASoC: samsung: fix CDCLK handling
On Thu, Oct 02, 2014 at 06:16:43PM +0200, Sylwester Nawrocki wrote: > [dropping unrelated addresses from Cc] You've dropped Liam who's the other ASoC maintainer. > Sorry for getting back late to this. Indeed we have a mess here. > I mostly tested interaction between two CPU DAIs - the main and the > overlay one (which is not supported in mainline yet). The dual DAIs were supported in mainline when the code was merged... > > Simplify the situation and solve the bug with the following approach: > > - as before, samsung_i2s_dai_probe() gates CDCLK by default > >(no need for smartq_wm8987 to do this as well) > > - platform drivers can gate/ungate CDCLK as necessary > >(currently only odroidx2 needs to do this) > > - i2s code has no other interaction with CDCLK > I'm not an ASoC expert, but I'd say it would be better to modify > the I2S module so there is no additional callbacks needed in > the machine driver. This way all machine drivers using the CDCLK > output could be simplified, not mentioning using simple-card. > I'm not sure how to do it yet, I'm going to take a look at this > over the weekend. Yes, keeping this in the SoC side drivers seems all round better. Perhaps the I2S driver should be exposing CDCLK as a clock via the clock API? Dunno if that'd help or not. Or refcount. signature.asc Description: Digital signature
Re: [PATCH] ASoC: samsung: fix CDCLK handling
On 2014-10-02 19:54, Mark Brown wrote: On Thu, Oct 02, 2014 at 06:16:43PM +0200, Sylwester Nawrocki wrote: [dropping unrelated addresses from Cc] You've dropped Liam who's the other ASoC maintainer. Whoops, pardon me, somewhat I thought about Liam more as the regulator API author, rather than ASoC maintainer. Will remember now. Sorry for getting back late to this. Indeed we have a mess here. I mostly tested interaction between two CPU DAIs - the main and the overlay one (which is not supported in mainline yet). The dual DAIs were supported in mainline when the code was merged... I meant to say that the the overlay DAI, using the I2S internal DMA, was not defined in odroidx2_max98090.c. Simplify the situation and solve the bug with the following approach: - as before, samsung_i2s_dai_probe() gates CDCLK by default (no need for smartq_wm8987 to do this as well) - platform drivers can gate/ungate CDCLK as necessary (currently only odroidx2 needs to do this) - i2s code has no other interaction with CDCLK I'm not an ASoC expert, but I'd say it would be better to modify the I2S module so there is no additional callbacks needed in the machine driver. This way all machine drivers using the CDCLK output could be simplified, not mentioning using simple-card. I'm not sure how to do it yet, I'm going to take a look at this over the weekend. Yes, keeping this in the SoC side drivers seems all round better. Perhaps the I2S driver should be exposing CDCLK as a clock via the clock API? Dunno if that'd help or not. Or refcount. Exposing CDCLK as clock via the clock API might be worth to try. I'll see how it could be done. If that doesn't work for some reason we could do just refcounting. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
