[PATCH] ASoC: wm8904: fix automatic sysclk configuration

[PATCH] ASoC: wm8904: fix automatic sysclk configuration

[Michael Walle]

The simple-card tries to signal the codec to disable rate constraints,
see commit 2458adb8f92a ("SoC: simple-card-utils: set 0Hz to sysclk when
shutdown"). This wasn't handled by the codec, instead it would set the
FLL frequency to 0Hz which isn't working. Since we don't have any rate
constraints just ignore this request.

Fixes: 13409d27cb39 ("ASoC: wm8904: configure sysclk/FLL automatically")
Signed-off-by: Michael Walle <michael@walle.cc>
---
 sound/soc/codecs/wm8904.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/codecs/wm8904.c b/sound/soc/codecs/wm8904.c
index 7d7ea15d73e0..5ffbaddd6e49 100644
--- a/sound/soc/codecs/wm8904.c
+++ b/sound/soc/codecs/wm8904.c
@@ -1806,6 +1806,12 @@ static int wm8904_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 
 	switch (clk_id) {
 	case WM8904_CLK_AUTO:
+		/* We don't have any rate constraints, so just ignore the
+		 * request to disable constraining.
+		 */
+		if (!freq)
+			return 0;
+
 		mclk_freq = clk_get_rate(priv->mclk);
 		/* enable FLL if a different sysclk is desired */
 		if (mclk_freq != freq) {
-- 
2.20.1

Re: [PATCH] ASoC: wm8904: fix automatic sysclk configuration

[Charles Keepax]

On Sat, Nov 23, 2019 at 12:25:32AM +0100, Michael Walle wrote:
> The simple-card tries to signal the codec to disable rate constraints,
> see commit 2458adb8f92a ("SoC: simple-card-utils: set 0Hz to sysclk when
> shutdown"). This wasn't handled by the codec, instead it would set the
> FLL frequency to 0Hz which isn't working. Since we don't have any rate
> constraints just ignore this request.
> 
> Fixes: 13409d27cb39 ("ASoC: wm8904: configure sysclk/FLL automatically")
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Thanks,
Charles

Applied "ASoC: wm8904: fix automatic sysclk configuration" to the asoc tree

[Mark Brown]

The patch

   ASoC: wm8904: fix automatic sysclk configuration

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 2a0bda276c64212e517cc1d65cf65719a9ab1ef6 Mon Sep 17 00:00:00 2001
From: Michael Walle <michael@walle.cc>
Date: Sat, 23 Nov 2019 00:25:32 +0100
Subject: [PATCH] ASoC: wm8904: fix automatic sysclk configuration

The simple-card tries to signal the codec to disable rate constraints,
see commit 2458adb8f92a ("SoC: simple-card-utils: set 0Hz to sysclk when
shutdown"). This wasn't handled by the codec, instead it would set the
FLL frequency to 0Hz which isn't working. Since we don't have any rate
constraints just ignore this request.

Fixes: 13409d27cb39 ("ASoC: wm8904: configure sysclk/FLL automatically")
Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20191122232532.22258-1-michael@walle.cc
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/wm8904.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/codecs/wm8904.c b/sound/soc/codecs/wm8904.c
index 2a7d23a5daa8..d191d81850ee 100644
--- a/sound/soc/codecs/wm8904.c
+++ b/sound/soc/codecs/wm8904.c
@@ -1806,6 +1806,12 @@ static int wm8904_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 
 	switch (clk_id) {
 	case WM8904_CLK_AUTO:
+		/* We don't have any rate constraints, so just ignore the
+		 * request to disable constraining.
+		 */
+		if (!freq)
+			return 0;
+
 		mclk_freq = clk_get_rate(priv->mclk);
 		/* enable FLL if a different sysclk is desired */
 		if (mclk_freq != freq) {
-- 
2.20.1