[PATCH 2/3] ASoC: mchp-spdiftx: add runtime pm support
Claudiu Beznea
claudiu.beznea at microchip.com
Thu Nov 17 04:37:49 PST 2022
Add runtime PM support for Microchip SPDIFTX driver. The runtime PM
APIs disables/enables IP's clock and enables/disable caching for
regmap.
Signed-off-by: Claudiu Beznea <claudiu.beznea at microchip.com>
---
sound/soc/atmel/mchp-spdiftx.c | 116 ++++++++++++++++++++++++---------
1 file changed, 86 insertions(+), 30 deletions(-)
diff --git a/sound/soc/atmel/mchp-spdiftx.c b/sound/soc/atmel/mchp-spdiftx.c
index 4e231cec9045..ec454e64d85c 100644
--- a/sound/soc/atmel/mchp-spdiftx.c
+++ b/sound/soc/atmel/mchp-spdiftx.c
@@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#include <linux/spinlock.h>
#include <sound/asoundef.h>
@@ -175,6 +176,7 @@ static const struct regmap_config mchp_spdiftx_regmap_config = {
.readable_reg = mchp_spdiftx_readable_reg,
.writeable_reg = mchp_spdiftx_writeable_reg,
.precious_reg = mchp_spdiftx_precious_reg,
+ .cache_type = REGCACHE_FLAT,
};
#define SPDIFTX_GCLK_RATIO 128
@@ -196,7 +198,6 @@ struct mchp_spdiftx_dev {
struct clk *pclk;
struct clk *gclk;
unsigned int fmt;
- unsigned int gclk_enabled:1;
};
static inline int mchp_spdiftx_is_running(struct mchp_spdiftx_dev *dev)
@@ -486,10 +487,9 @@ static int mchp_spdiftx_hw_params(struct snd_pcm_substream *substream,
mchp_spdiftx_channel_status_write(dev);
spin_unlock_irqrestore(&ctrl->lock, flags);
- if (dev->gclk_enabled) {
- clk_disable_unprepare(dev->gclk);
- dev->gclk_enabled = 0;
- }
+ /* GCLK is enabled by runtime PM. */
+ clk_disable_unprepare(dev->gclk);
+
ret = clk_set_rate(dev->gclk, params_rate(params) *
SPDIFTX_GCLK_RATIO);
if (ret) {
@@ -503,7 +503,7 @@ static int mchp_spdiftx_hw_params(struct snd_pcm_substream *substream,
dev_err(dev->dev, "unable to enable gclk: %d\n", ret);
return ret;
}
- dev->gclk_enabled = 1;
+
dev_dbg(dev->dev, "%s(): GCLK set to %d\n", __func__,
params_rate(params) * SPDIFTX_GCLK_RATIO);
@@ -523,10 +523,6 @@ static int mchp_spdiftx_hw_free(struct snd_pcm_substream *substream,
regmap_write(dev->regmap, SPDIFTX_IDR,
SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
- if (dev->gclk_enabled) {
- clk_disable_unprepare(dev->gclk);
- dev->gclk_enabled = 0;
- }
return regmap_write(dev->regmap, SPDIFTX_CR,
SPDIFTX_CR_SWRST | SPDIFTX_CR_FCLR);
@@ -709,17 +705,9 @@ static struct snd_kcontrol_new mchp_spdiftx_ctrls[] = {
static int mchp_spdiftx_dai_probe(struct snd_soc_dai *dai)
{
struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
- int ret;
snd_soc_dai_init_dma_data(dai, &dev->playback, NULL);
- ret = clk_prepare_enable(dev->pclk);
- if (ret) {
- dev_err(dev->dev,
- "failed to enable the peripheral clock: %d\n", ret);
- return ret;
- }
-
/* Add controls */
snd_soc_add_dai_controls(dai, mchp_spdiftx_ctrls,
ARRAY_SIZE(mchp_spdiftx_ctrls));
@@ -727,19 +715,9 @@ static int mchp_spdiftx_dai_probe(struct snd_soc_dai *dai)
return 0;
}
-static int mchp_spdiftx_dai_remove(struct snd_soc_dai *dai)
-{
- struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
-
- clk_disable_unprepare(dev->pclk);
-
- return 0;
-}
-
static struct snd_soc_dai_driver mchp_spdiftx_dai = {
.name = "mchp-spdiftx",
.probe = mchp_spdiftx_dai_probe,
- .remove = mchp_spdiftx_dai_remove,
.playback = {
.stream_name = "S/PDIF Playback",
.channels_min = 1,
@@ -763,6 +741,54 @@ static const struct of_device_id mchp_spdiftx_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, mchp_spdiftx_dt_ids);
+static int mchp_spdiftx_runtime_suspend(struct device *dev)
+{
+ struct mchp_spdiftx_dev *spdiftx = dev_get_drvdata(dev);
+
+ regcache_cache_only(spdiftx->regmap, true);
+
+ clk_disable_unprepare(spdiftx->gclk);
+ clk_disable_unprepare(spdiftx->pclk);
+
+ return 0;
+}
+
+static int mchp_spdiftx_runtime_resume(struct device *dev)
+{
+ struct mchp_spdiftx_dev *spdiftx = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(spdiftx->pclk);
+ if (ret) {
+ dev_err(spdiftx->dev,
+ "failed to enable the peripheral clock: %d\n", ret);
+ return ret;
+ }
+ ret = clk_prepare_enable(spdiftx->gclk);
+ if (ret) {
+ dev_err(spdiftx->dev,
+ "failed to enable generic clock: %d\n", ret);
+ goto disable_pclk;
+ }
+
+ regcache_cache_only(spdiftx->regmap, false);
+ regcache_mark_dirty(spdiftx->regmap);
+ ret = regcache_sync(spdiftx->regmap);
+ if (ret) {
+ regcache_cache_only(spdiftx->regmap, true);
+ clk_disable_unprepare(spdiftx->gclk);
+disable_pclk:
+ clk_disable_unprepare(spdiftx->pclk);
+ }
+
+ return ret;
+}
+
+static const struct dev_pm_ops mchp_spdiftx_pm_ops = {
+ RUNTIME_PM_OPS(mchp_spdiftx_runtime_suspend, mchp_spdiftx_runtime_resume,
+ NULL)
+};
+
static int mchp_spdiftx_probe(struct platform_device *pdev)
{
struct mchp_spdiftx_dev *dev;
@@ -827,29 +853,59 @@ static int mchp_spdiftx_probe(struct platform_device *pdev)
dev->regmap = regmap;
platform_set_drvdata(pdev, dev);
+ pm_runtime_enable(dev->dev);
+ if (!pm_runtime_enabled(dev->dev)) {
+ err = mchp_spdiftx_runtime_resume(dev->dev);
+ if (err)
+ return err;
+ }
+
dev->playback.addr = (dma_addr_t)mem->start + SPDIFTX_CDR;
dev->playback.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (err) {
dev_err(&pdev->dev, "failed to register PMC: %d\n", err);
- return err;
+ goto pm_runtime_suspend;
}
err = devm_snd_soc_register_component(&pdev->dev,
&mchp_spdiftx_component,
&mchp_spdiftx_dai, 1);
- if (err)
+ if (err) {
dev_err(&pdev->dev, "failed to register component: %d\n", err);
+ goto pm_runtime_suspend;
+ }
+
+ return 0;
+
+pm_runtime_suspend:
+ if (!pm_runtime_status_suspended(dev->dev))
+ mchp_spdiftx_runtime_suspend(dev->dev);
+ pm_runtime_disable(dev->dev);
return err;
}
+static int mchp_spdiftx_remove(struct platform_device *pdev)
+{
+ struct mchp_spdiftx_dev *dev = platform_get_drvdata(pdev);
+
+ if (!pm_runtime_status_suspended(dev->dev))
+ mchp_spdiftx_runtime_suspend(dev->dev);
+
+ pm_runtime_disable(dev->dev);
+
+ return 0;
+}
+
static struct platform_driver mchp_spdiftx_driver = {
.probe = mchp_spdiftx_probe,
+ .remove = mchp_spdiftx_remove,
.driver = {
.name = "mchp_spdiftx",
.of_match_table = of_match_ptr(mchp_spdiftx_dt_ids),
+ .pm = pm_ptr(&mchp_spdiftx_pm_ops)
},
};
--
2.34.1
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