[PATCH v2] ASoC: fsl_sai: Correct the clock source for mclk0

[PATCH v2] ASoC: fsl_sai: Correct the clock source for mclk0

[Shengjiu Wang]

On VF610, mclk0 = bus_clk;
On i.MX6SX/6UL/6ULL/7D, mclk0 = mclk1;
On i.MX7ULP, mclk0 = bus_clk;
On i.MX8QM/8QXP, mclk0 = bus_clk;
On i.MX8MQ/8MN/8MM/8MP, mclk0 = bus_clk;

So add variable mclk0_is_mclk1 in fsl_sai_soc_data to
distinguish these platforms.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
changes in v2:
- rename mclk0_mclk1_match to mclk0_is_mclk1
- skip MCLK0 when it is same as MCLK1 on master clock scanning

 sound/soc/fsl/fsl_sai.c | 20 ++++++++++++++++++--
 sound/soc/fsl/fsl_sai.h |  1 +
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 3e5c1eaccd5e..f3d3d20d35d7 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -359,7 +359,14 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
 	if (sai->is_slave_mode)
 		return 0;
 
-	for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
+	/*
+	 * There is no point in polling MCLK0 if it is identical to MCLK1.
+	 * And given that MQS use case has to use MCLK1 though two clocks
+	 * are the same, we simply skip MCLK0 and start to find from MCLK1.
+	 */
+	id = sai->soc_data->mclk0_is_mclk1 ? 1 : 0;
+
+	for (; id < FSL_SAI_MCLK_MAX; id++) {
 		clk_rate = clk_get_rate(sai->mclk_clk[id]);
 		if (!clk_rate)
 			continue;
@@ -1040,7 +1047,6 @@ static int fsl_sai_probe(struct platform_device *pdev)
 		sai->bus_clk = NULL;
 	}
 
-	sai->mclk_clk[0] = sai->bus_clk;
 	for (i = 1; i < FSL_SAI_MCLK_MAX; i++) {
 		sprintf(tmp, "mclk%d", i);
 		sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
@@ -1051,6 +1057,11 @@ static int fsl_sai_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (sai->soc_data->mclk0_is_mclk1)
+		sai->mclk_clk[0] = sai->mclk_clk[1];
+	else
+		sai->mclk_clk[0] = sai->bus_clk;
+
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
@@ -1165,6 +1176,7 @@ static const struct fsl_sai_soc_data fsl_sai_vf610_data = {
 	.use_edma = false,
 	.fifo_depth = 32,
 	.reg_offset = 0,
+	.mclk0_is_mclk1 = false,
 };
 
 static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
@@ -1172,6 +1184,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
 	.use_edma = false,
 	.fifo_depth = 32,
 	.reg_offset = 0,
+	.mclk0_is_mclk1 = true,
 };
 
 static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = {
@@ -1179,6 +1192,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = {
 	.use_edma = false,
 	.fifo_depth = 16,
 	.reg_offset = 8,
+	.mclk0_is_mclk1 = false,
 };
 
 static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = {
@@ -1186,6 +1200,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = {
 	.use_edma = false,
 	.fifo_depth = 128,
 	.reg_offset = 8,
+	.mclk0_is_mclk1 = false,
 };
 
 static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = {
@@ -1193,6 +1208,7 @@ static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = {
 	.use_edma = true,
 	.fifo_depth = 64,
 	.reg_offset = 0,
+	.mclk0_is_mclk1 = false,
 };
 
 static const struct of_device_id fsl_sai_ids[] = {
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 4bbcd0dbe8f1..ff2619f1b214 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -219,6 +219,7 @@
 struct fsl_sai_soc_data {
 	bool use_imx_pcm;
 	bool use_edma;
+	bool mclk0_is_mclk1;
 	unsigned int fifo_depth;
 	unsigned int reg_offset;
 };
-- 
2.27.0

Re: [PATCH v2] ASoC: fsl_sai: Correct the clock source for mclk0

[Nicolin Chen]

On Thu, Nov 19, 2020 at 02:40:38PM +0800, Shengjiu Wang wrote:
> On VF610, mclk0 = bus_clk;
> On i.MX6SX/6UL/6ULL/7D, mclk0 = mclk1;
> On i.MX7ULP, mclk0 = bus_clk;
> On i.MX8QM/8QXP, mclk0 = bus_clk;
> On i.MX8MQ/8MN/8MM/8MP, mclk0 = bus_clk;
> 
> So add variable mclk0_is_mclk1 in fsl_sai_soc_data to
> distinguish these platforms.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>

Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>

Re: [PATCH v2] ASoC: fsl_sai: Correct the clock source for mclk0

[Mark Brown]

On Thu, 19 Nov 2020 14:40:38 +0800, Shengjiu Wang wrote:
> On VF610, mclk0 = bus_clk;
> On i.MX6SX/6UL/6ULL/7D, mclk0 = mclk1;
> On i.MX7ULP, mclk0 = bus_clk;
> On i.MX8QM/8QXP, mclk0 = bus_clk;
> On i.MX8MQ/8MN/8MM/8MP, mclk0 = bus_clk;
> 
> So add variable mclk0_is_mclk1 in fsl_sai_soc_data to
> distinguish these platforms.

Applied to

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

Thanks!

[1/1] ASoC: fsl_sai: Correct the clock source for mclk0
      commit: 53233e40c142b1e0e1df9d9ac0ffc0945cfffbc9

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