diff options
| -rw-r--r-- | sound/soc/tegra/tegra20_ac97.c | 21 | ||||
| -rw-r--r-- | sound/soc/tegra/tegra20_ac97.h | 1 |
2 files changed, 22 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra20_ac97.c b/sound/soc/tegra/tegra20_ac97.c index 06c728ae17ed..c454a34c15c4 100644 --- a/sound/soc/tegra/tegra20_ac97.c +++ b/sound/soc/tegra/tegra20_ac97.c @@ -21,6 +21,7 @@ #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> @@ -313,6 +314,12 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev) } dev_set_drvdata(&pdev->dev, ac97); + ac97->reset = devm_reset_control_get_exclusive(&pdev->dev, "ac97"); + if (IS_ERR(ac97->reset)) { + dev_err(&pdev->dev, "Can't retrieve ac97 reset\n"); + return PTR_ERR(ac97->reset); + } + ac97->clk_ac97 = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(ac97->clk_ac97)) { dev_err(&pdev->dev, "Can't retrieve ac97 clock\n"); @@ -364,12 +371,26 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev) ac97->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; ac97->playback_dma_data.maxburst = 4; + ret = reset_control_assert(ac97->reset); + if (ret) { + dev_err(&pdev->dev, "Failed to assert AC'97 reset: %d\n", ret); + goto err_clk_put; + } + ret = clk_prepare_enable(ac97->clk_ac97); if (ret) { dev_err(&pdev->dev, "clk_enable failed: %d\n", ret); goto err_clk_put; } + usleep_range(10, 100); + + ret = reset_control_deassert(ac97->reset); + if (ret) { + dev_err(&pdev->dev, "Failed to deassert AC'97 reset: %d\n", ret); + goto err_clk_disable_unprepare; + } + ret = snd_soc_set_ac97_ops(&tegra20_ac97_ops); if (ret) { dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret); diff --git a/sound/soc/tegra/tegra20_ac97.h b/sound/soc/tegra/tegra20_ac97.h index e467cd1ff2ca..870ea09ff301 100644 --- a/sound/soc/tegra/tegra20_ac97.h +++ b/sound/soc/tegra/tegra20_ac97.h @@ -78,6 +78,7 @@ struct tegra20_ac97 { struct clk *clk_ac97; struct snd_dmaengine_dai_dma_data capture_dma_data; struct snd_dmaengine_dai_dma_data playback_dma_data; + struct reset_control *reset; struct regmap *regmap; int reset_gpio; int sync_gpio; |