diff options
Diffstat (limited to 'sound/soc/tegra/tegra20_i2s.c')
| -rw-r--r-- | sound/soc/tegra/tegra20_i2s.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra20_i2s.c b/sound/soc/tegra/tegra20_i2s.c index d7a3d046c8f8..c0af5352b483 100644 --- a/sound/soc/tegra/tegra20_i2s.c +++ b/sound/soc/tegra/tegra20_i2s.c @@ -22,6 +22,7 @@ #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> +#include <linux/reset.h> #include <linux/slab.h> #include <sound/core.h> #include <sound/pcm.h> @@ -37,6 +38,8 @@ static int tegra20_i2s_runtime_suspend(struct device *dev) { struct tegra20_i2s *i2s = dev_get_drvdata(dev); + regcache_cache_only(i2s->regmap, true); + clk_disable_unprepare(i2s->clk_i2s); return 0; @@ -47,13 +50,35 @@ static int tegra20_i2s_runtime_resume(struct device *dev) struct tegra20_i2s *i2s = dev_get_drvdata(dev); int ret; + ret = reset_control_assert(i2s->reset); + if (ret) + return ret; + ret = clk_prepare_enable(i2s->clk_i2s); if (ret) { dev_err(dev, "clk_enable failed: %d\n", ret); return ret; } + usleep_range(10, 100); + + ret = reset_control_deassert(i2s->reset); + if (ret) + goto disable_clocks; + + regcache_cache_only(i2s->regmap, false); + regcache_mark_dirty(i2s->regmap); + + ret = regcache_sync(i2s->regmap); + if (ret) + goto disable_clocks; + return 0; + +disable_clocks: + clk_disable_unprepare(i2s->clk_i2s); + + return ret; } static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai, @@ -339,6 +364,12 @@ static int tegra20_i2s_platform_probe(struct platform_device *pdev) i2s->dai = tegra20_i2s_dai_template; i2s->dai.name = dev_name(&pdev->dev); + i2s->reset = devm_reset_control_get_exclusive(&pdev->dev, "i2s"); + if (IS_ERR(i2s->reset)) { + dev_err(&pdev->dev, "Can't retrieve i2s reset\n"); + return PTR_ERR(i2s->reset); + } + i2s->clk_i2s = clk_get(&pdev->dev, NULL); if (IS_ERR(i2s->clk_i2s)) { dev_err(&pdev->dev, "Can't retrieve i2s clock\n"); |