[PATCH] ASoC: fsl_sai: Refine regcache usage with pm runtime

When there is dedicated power domain bound with device, after probing
the power will be disabled, then registers are not accessible in
fsl_sai_dai_probe(), so regcache only need to be enabled in end of
probe() and regcache_mark_dirty should be moved to pm runtime resume
callback function.

Signed-off-by: Shengjiu Wang <redacted>
---
 sound/soc/fsl/fsl_sai.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 9d436b0c5718..a22562f2df47 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c

@@ -1016,6 +1016,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, sai);
 
 	pm_runtime_enable(&pdev->dev);
+	regcache_cache_only(sai->regmap, true);
 
 	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
 			&fsl_sai_dai, 1);

@@ -1107,7 +1108,6 @@ static int fsl_sai_runtime_suspend(struct device *dev)
 	clk_disable_unprepare(sai->bus_clk);
 
 	regcache_cache_only(sai->regmap, true);
-	regcache_mark_dirty(sai->regmap);
 
 	return 0;
 }

@@ -1137,6 +1137,7 @@ static int fsl_sai_runtime_resume(struct device *dev)
 	}
 
 	regcache_cache_only(sai->regmap, false);
+	regcache_mark_dirty(sai->regmap);
 	regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), FSL_SAI_CSR_SR);
 	regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), FSL_SAI_CSR_SR);
 	usleep_range(1000, 2000);

-- 
2.21.0

On Mon, Jun 29, 2020 at 02:42:33PM +0800, Shengjiu Wang wrote:

When there is dedicated power domain bound with device, after probing
the power will be disabled, then registers are not accessible in
fsl_sai_dai_probe(), so regcache only need to be enabled in end of
probe() and regcache_mark_dirty should be moved to pm runtime resume
callback function.

Signed-off-by: Shengjiu Wang <redacted>

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

On Mon, 29 Jun 2020 14:42:33 +0800, Shengjiu Wang wrote:

When there is dedicated power domain bound with device, after probing
the power will be disabled, then registers are not accessible in
fsl_sai_dai_probe(), so regcache only need to be enabled in end of
probe() and regcache_mark_dirty should be moved to pm runtime resume
callback function.

Applied to

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

Thanks!

[1/1] ASoC: fsl_sai: Refine regcache usage with pm runtime
      commit: d8d702e19e997cf3f172487e0659d0e68aa5ede5

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