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ASoC: tegra20: spdif: Reset hardware

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Reset S/PDIF controller on runtime PM suspend/resume to ensure that we
always have a consistent hardware state.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20211204143725.31646-11-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Osipenko 2021-12-04 17:37:13 +03:00 committed by Mark Brown
parent 150f4d573f
commit ec1b4545d7
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 33 additions and 0 deletions
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32
sound/soc/tegra/tegra20_spdif.c
View File

@ -7,6 +7,7 @@
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
@ -14,6 +15,7 @@
#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>
@ -27,6 +29,8 @@ static __maybe_unused int tegra20_spdif_runtime_suspend(struct device *dev)
{
struct tegra20_spdif *spdif = dev_get_drvdata(dev);
regcache_cache_only(spdif->regmap, true);
clk_disable_unprepare(spdif->clk_spdif_out);
return 0;
@ -37,13 +41,35 @@ static __maybe_unused int tegra20_spdif_runtime_resume(struct device *dev)
struct tegra20_spdif *spdif = dev_get_drvdata(dev);
int ret;
ret = reset_control_assert(spdif->reset);
if (ret)
return ret;
ret = clk_prepare_enable(spdif->clk_spdif_out);
if (ret) {
dev_err(dev, "clk_enable failed: %d\n", ret);
return ret;
}
usleep_range(10, 100);
ret = reset_control_deassert(spdif->reset);
if (ret)
goto disable_clocks;
regcache_cache_only(spdif->regmap, false);
regcache_mark_dirty(spdif->regmap);
ret = regcache_sync(spdif->regmap);
if (ret)
goto disable_clocks;
return 0;
disable_clocks:
clk_disable_unprepare(spdif->clk_spdif_out);
return ret;
}
static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,
@ -268,6 +294,12 @@ static int tegra20_spdif_platform_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, spdif);
spdif->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(spdif->reset)) {
dev_err(&pdev->dev, "Can't retrieve spdif reset\n");
return PTR_ERR(spdif->reset);
}
spdif->clk_spdif_out = devm_clk_get(&pdev->dev, "out");
if (IS_ERR(spdif->clk_spdif_out)) {
dev_err(&pdev->dev, "Could not retrieve spdif clock\n");

1
sound/soc/tegra/tegra20_spdif.h
View File

@ -451,6 +451,7 @@ struct tegra20_spdif {
struct snd_dmaengine_dai_dma_data capture_dma_data;
struct snd_dmaengine_dai_dma_data playback_dma_data;
struct regmap *regmap;
struct reset_control *reset;
};
#endif