diff options
Diffstat (limited to 'sound/soc/stm/stm32_sai.c')
| -rw-r--r-- | sound/soc/stm/stm32_sai.c | 80 |
1 files changed, 71 insertions, 9 deletions
diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c index d68d62f12df5..7550d5f08be3 100644 --- a/sound/soc/stm/stm32_sai.c +++ b/sound/soc/stm/stm32_sai.c @@ -21,6 +21,7 @@ #include <linux/delay.h> #include <linux/module.h> #include <linux/of_platform.h> +#include <linux/pinctrl/consumer.h> #include <linux/reset.h> #include <sound/dmaengine_pcm.h> @@ -44,20 +45,41 @@ static const struct of_device_id stm32_sai_ids[] = { {} }; -static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci) +static int stm32_sai_pclk_disable(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + + clk_disable_unprepare(sai->pclk); + + return 0; +} + +static int stm32_sai_pclk_enable(struct device *dev) { + struct stm32_sai_data *sai = dev_get_drvdata(dev); int ret; - /* Enable peripheral clock to allow GCR register access */ ret = clk_prepare_enable(sai->pclk); if (ret) { dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret); return ret; } + return 0; +} + +static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci) +{ + int ret; + + /* Enable peripheral clock to allow GCR register access */ + ret = stm32_sai_pclk_enable(&sai->pdev->dev); + if (ret) + return ret; + writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base); - clk_disable_unprepare(sai->pclk); + stm32_sai_pclk_disable(&sai->pdev->dev); return 0; } @@ -68,11 +90,9 @@ static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco) int ret; /* Enable peripheral clock to allow GCR register access */ - ret = clk_prepare_enable(sai->pclk); - if (ret) { - dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret); + ret = stm32_sai_pclk_enable(&sai->pdev->dev); + if (ret) return ret; - } dev_dbg(&sai->pdev->dev, "Set %pOFn%s as synchro provider\n", sai->pdev->dev.of_node, @@ -83,13 +103,13 @@ static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco) dev_err(&sai->pdev->dev, "%pOFn%s already set as sync provider\n", sai->pdev->dev.of_node, prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); - clk_disable_unprepare(sai->pclk); + stm32_sai_pclk_disable(&sai->pdev->dev); return -EINVAL; } writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base); - clk_disable_unprepare(sai->pclk); + stm32_sai_pclk_disable(&sai->pdev->dev); return 0; } @@ -195,12 +215,54 @@ static int stm32_sai_probe(struct platform_device *pdev) return devm_of_platform_populate(&pdev->dev); } +#ifdef CONFIG_PM_SLEEP +/* + * When pins are shared by two sai sub instances, pins have to be defined + * in sai parent node. In this case, pins state is not managed by alsa fw. + * These pins are managed in suspend/resume callbacks. + */ +static int stm32_sai_suspend(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + int ret; + + ret = stm32_sai_pclk_enable(dev); + if (ret) + return ret; + + sai->gcr = readl_relaxed(sai->base); + stm32_sai_pclk_disable(dev); + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_sai_resume(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + int ret; + + ret = stm32_sai_pclk_enable(dev); + if (ret) + return ret; + + writel_relaxed(sai->gcr, sai->base); + stm32_sai_pclk_disable(dev); + + return pinctrl_pm_select_default_state(dev); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops stm32_sai_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_sai_suspend, stm32_sai_resume) +}; + MODULE_DEVICE_TABLE(of, stm32_sai_ids); static struct platform_driver stm32_sai_driver = { .driver = { .name = "st,stm32-sai", .of_match_table = stm32_sai_ids, + .pm = &stm32_sai_pm_ops, }, .probe = stm32_sai_probe, }; |