WSA SoundWire Controller does not support Clock stop and performs a soft reset on suspend resume path. Its recommended that WSA881x codecs connected to this are also reset using a hard reset during suspend resume.

So this codec driver performs a hard reset during suspend resume cycle.

Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org ---

Changes since v3: - added missing sign off. - no code changes

sound/soc/codecs/wsa881x.c | 53 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)

diff --git a/sound/soc/codecs/wsa881x.c b/sound/soc/codecs/wsa881x.c index 0222370ff95d..616b26c70c3b 100644 --- a/sound/soc/codecs/wsa881x.c +++ b/sound/soc/codecs/wsa881x.c @@ -11,6 +11,7 @@ #include <linux/of_gpio.h> #include <linux/regmap.h> #include <linux/slab.h> +#include <linux/pm_runtime.h> #include <linux/soundwire/sdw.h> #include <linux/soundwire/sdw_registers.h> #include <linux/soundwire/sdw_type.h> @@ -198,6 +199,7 @@ #define WSA881X_OCP_CTL_TIMER_SEC 2 #define WSA881X_OCP_CTL_TEMP_CELSIUS 25 #define WSA881X_OCP_CTL_POLL_TIMER_SEC 60 +#define WSA881X_PROBE_TIMEOUT 1000

#define WSA881X_PA_GAIN_TLV(xname, reg, shift, max, invert, tlv_array) \ { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \ @@ -747,6 +749,12 @@ static int wsa881x_put_pa_gain(struct snd_kcontrol *kc, unsigned int mask = (1 << fls(max)) - 1; int val, ret, min_gain, max_gain;

+ ret = pm_runtime_get_sync(comp->dev); + if (ret < 0 && ret != -EACCES) { + pm_runtime_put_noidle(comp->dev); + return ret; + } + max_gain = (max - ucontrol->value.integer.value[0]) & mask; /* * Gain has to set incrementally in 4 steps @@ -773,6 +781,9 @@ static int wsa881x_put_pa_gain(struct snd_kcontrol *kc, usleep_range(1000, 1010); }

+ pm_runtime_mark_last_busy(comp->dev); + pm_runtime_put_autosuspend(comp->dev); + return 1; }

@@ -1101,6 +1112,7 @@ static int wsa881x_probe(struct sdw_slave *pdev, const struct sdw_device_id *id) { struct wsa881x_priv *wsa881x; + struct device *dev = &pdev->dev;

wsa881x = devm_kzalloc(&pdev->dev, sizeof(*wsa881x), GFP_KERNEL); if (!wsa881x) @@ -1132,12 +1144,52 @@ static int wsa881x_probe(struct sdw_slave *pdev, return PTR_ERR(wsa881x->regmap); }

+ pm_runtime_set_autosuspend_delay(dev, 3000); + pm_runtime_use_autosuspend(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + return devm_snd_soc_register_component(&pdev->dev, &wsa881x_component_drv, wsa881x_dais, ARRAY_SIZE(wsa881x_dais)); }

+static int __maybe_unused wsa881x_runtime_suspend(struct device *dev) +{ + struct regmap *regmap = dev_get_regmap(dev, NULL); + struct wsa881x_priv *wsa881x = dev_get_drvdata(dev); + + gpiod_direction_output(wsa881x->sd_n, 0); + + regcache_cache_only(regmap, true); + regcache_mark_dirty(regmap); + + return 0; +} + +static int __maybe_unused wsa881x_runtime_resume(struct device *dev) +{ + struct sdw_slave *slave = dev_to_sdw_dev(dev); + struct regmap *regmap = dev_get_regmap(dev, NULL); + struct wsa881x_priv *wsa881x = dev_get_drvdata(dev); + + gpiod_direction_output(wsa881x->sd_n, 1); + + wait_for_completion_timeout(&slave->initialization_complete, + msecs_to_jiffies(WSA881X_PROBE_TIMEOUT)); + + regcache_cache_only(regmap, false); + regcache_sync(regmap); + + return 0; +} + +static const struct dev_pm_ops wsa881x_pm_ops = { + SET_RUNTIME_PM_OPS(wsa881x_runtime_suspend, wsa881x_runtime_resume, NULL) +}; + static const struct sdw_device_id wsa881x_slave_id[] = { SDW_SLAVE_ENTRY(0x0217, 0x2010, 0), SDW_SLAVE_ENTRY(0x0217, 0x2110, 0), @@ -1151,6 +1203,7 @@ static struct sdw_driver wsa881x_codec_driver = { .id_table = wsa881x_slave_id, .driver = { .name = "wsa881x-codec", + .pm = &wsa881x_pm_ops, } }; module_sdw_driver(wsa881x_codec_driver);