Implement clock power saving by taking advantage of runtime PM infrastructure. This simplifies the code and allow using the same infrastructure for suspend to RAM functionalities.
Signed-off-by: Claudiu Beznea claudiu.beznea@microchip.com --- sound/soc/atmel/mchp-pdmc.c | 126 ++++++++++++++++++++++++------------ 1 file changed, 84 insertions(+), 42 deletions(-)
diff --git a/sound/soc/atmel/mchp-pdmc.c b/sound/soc/atmel/mchp-pdmc.c index 44aefbd5b62c..f184404e74e5 100644 --- a/sound/soc/atmel/mchp-pdmc.c +++ b/sound/soc/atmel/mchp-pdmc.c @@ -11,6 +11,7 @@ #include <linux/clk.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/pm_runtime.h> #include <linux/regmap.h>
#include <sound/core.h> @@ -115,7 +116,6 @@ struct mchp_pdmc { int mic_no; int sinc_order; bool audio_filter_en; - u8 gclk_enabled:1; };
static const char *const mchp_pdmc_sinc_filter_order_text[] = { @@ -454,13 +454,6 @@ static int mchp_pdmc_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai); - int ret; - - ret = clk_prepare_enable(dd->pclk); - if (ret) { - dev_err(dd->dev, "failed to enable the peripheral clock: %d\n", ret); - return ret; - }
regmap_write(dd->regmap, MCHP_PDMC_CR, MCHP_PDMC_CR_SWRST);
@@ -470,14 +463,6 @@ static int mchp_pdmc_startup(struct snd_pcm_substream *substream, return 0; }
-static void mchp_pdmc_shutdown(struct snd_pcm_substream *substream, - struct snd_soc_dai *dai) -{ - struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai); - - clk_disable_unprepare(dd->pclk); -} - static int mchp_pdmc_dai_probe(struct snd_soc_dai *dai) { struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai); @@ -594,11 +579,6 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, cfgr_val |= MCHP_PDMC_CFGR_BSSEL(i); }
- if (dd->gclk_enabled) { - clk_disable_unprepare(dd->gclk); - dd->gclk_enabled = 0; - } - for (osr_start = dd->audio_filter_en ? 64 : 8; osr_start <= 256 && best_diff_rate; osr_start *= 2) { long round_rate; @@ -620,8 +600,12 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, return -EINVAL; }
+ /* CLK is enabled by runtime PM. */ + clk_disable_unprepare(dd->gclk); + /* set the rate */ ret = clk_set_rate(dd->gclk, gclk_rate); + clk_prepare_enable(dd->gclk); if (ret) { dev_err(comp->dev, "unable to set rate %lu to GCLK: %d\n", gclk_rate, ret); @@ -636,9 +620,6 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, mr_val |= MCHP_PDMC_MR_CHUNK(dd->addr.maxburst); dev_dbg(comp->dev, "maxburst set to %d\n", dd->addr.maxburst);
- clk_prepare_enable(dd->gclk); - dd->gclk_enabled = 1; - snd_soc_component_update_bits(comp, MCHP_PDMC_MR, MCHP_PDMC_MR_OSR_MASK | MCHP_PDMC_MR_SINCORDER_MASK | @@ -650,19 +631,6 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, return 0; }
-static int mchp_pdmc_hw_free(struct snd_pcm_substream *substream, - struct snd_soc_dai *dai) -{ - struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai); - - if (dd->gclk_enabled) { - clk_disable_unprepare(dd->gclk); - dd->gclk_enabled = 0; - } - - return 0; -} - static int mchp_pdmc_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { @@ -711,9 +679,7 @@ static int mchp_pdmc_trigger(struct snd_pcm_substream *substream, static const struct snd_soc_dai_ops mchp_pdmc_dai_ops = { .set_fmt = mchp_pdmc_set_fmt, .startup = mchp_pdmc_startup, - .shutdown = mchp_pdmc_shutdown, .hw_params = mchp_pdmc_hw_params, - .hw_free = mchp_pdmc_hw_free, .trigger = mchp_pdmc_trigger, };
@@ -864,6 +830,7 @@ static const struct regmap_config mchp_pdmc_regmap_config = { .readable_reg = mchp_pdmc_readable_reg, .writeable_reg = mchp_pdmc_writeable_reg, .precious_reg = mchp_pdmc_precious_reg, + .cache_type = REGCACHE_FLAT, };
static int mchp_pdmc_dt_init(struct mchp_pdmc *dd) @@ -970,6 +937,49 @@ static struct snd_dmaengine_pcm_config mchp_pdmc_config = { .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, };
+static int mchp_pdmc_runtime_suspend(struct device *dev) +{ + struct mchp_pdmc *dd = dev_get_drvdata(dev); + + regcache_cache_only(dd->regmap, true); + + clk_disable_unprepare(dd->gclk); + clk_disable_unprepare(dd->pclk); + + return 0; +} + +static int mchp_pdmc_runtime_resume(struct device *dev) +{ + struct mchp_pdmc *dd = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(dd->pclk); + if (ret) { + dev_err(dd->dev, + "failed to enable the peripheral clock: %d\n", ret); + return ret; + } + ret = clk_prepare_enable(dd->gclk); + if (ret) { + dev_err(dd->dev, + "failed to enable generic clock: %d\n", ret); + goto disable_pclk; + } + + regcache_cache_only(dd->regmap, false); + regcache_mark_dirty(dd->regmap); + ret = regcache_sync(dd->regmap); + if (ret) { + regcache_cache_only(dd->regmap, true); + clk_disable_unprepare(dd->gclk); +disable_pclk: + clk_disable_unprepare(dd->pclk); + } + + return ret; +} + static int mchp_pdmc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1039,18 +1049,25 @@ static int mchp_pdmc_probe(struct platform_device *pdev) dd->addr.addr = (dma_addr_t)res->start + MCHP_PDMC_RHR; platform_set_drvdata(pdev, dd);
+ pm_runtime_enable(dd->dev); + if (!pm_runtime_enabled(dd->dev)) { + ret = mchp_pdmc_runtime_resume(dd->dev); + if (ret) + return ret; + } + /* register platform */ ret = devm_snd_dmaengine_pcm_register(dev, &mchp_pdmc_config, 0); if (ret) { dev_err(dev, "could not register platform: %d\n", ret); - return ret; + goto pm_runtime_suspend; }
ret = devm_snd_soc_register_component(dev, &mchp_pdmc_dai_component, &mchp_pdmc_dai, 1); if (ret) { dev_err(dev, "could not register CPU DAI: %d\n", ret); - return ret; + goto pm_runtime_suspend; }
/* print IP version */ @@ -1059,6 +1076,25 @@ static int mchp_pdmc_probe(struct platform_device *pdev) version & MCHP_PDMC_VER_VERSION);
return 0; + +pm_runtime_suspend: + if (!pm_runtime_status_suspended(dd->dev)) + mchp_pdmc_runtime_suspend(dd->dev); + pm_runtime_disable(dd->dev); + + return ret; +} + +static int mchp_pdmc_remove(struct platform_device *pdev) +{ + struct mchp_pdmc *dd = platform_get_drvdata(pdev); + + if (!pm_runtime_status_suspended(dd->dev)) + mchp_pdmc_runtime_suspend(dd->dev); + + pm_runtime_disable(dd->dev); + + return 0; }
static const struct of_device_id mchp_pdmc_of_match[] = { @@ -1070,13 +1106,19 @@ static const struct of_device_id mchp_pdmc_of_match[] = { }; MODULE_DEVICE_TABLE(of, mchp_pdmc_of_match);
+static const struct dev_pm_ops mchp_pdmc_pm_ops = { + RUNTIME_PM_OPS(mchp_pdmc_runtime_suspend, mchp_pdmc_runtime_resume, + NULL) +}; + static struct platform_driver mchp_pdmc_driver = { .driver = { .name = "mchp-pdmc", .of_match_table = of_match_ptr(mchp_pdmc_of_match), - .pm = &snd_soc_pm_ops, + .pm = pm_ptr(&mchp_pdmc_pm_ops), }, .probe = mchp_pdmc_probe, + .remove = mchp_pdmc_remove, }; module_platform_driver(mchp_pdmc_driver);