1 files changed, 25 insertions, 1 deletions

diff --git a/sound/soc/tegra/tegra20_ac97.c b/sound/soc/tegra/tegra20_ac97.c
index 06c728ae17ed..87facfbcdd11 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>
@@ -238,7 +239,8 @@ static struct snd_soc_dai_driver tegra20_ac97_dai = {
 };
 
 static const struct snd_soc_component_driver tegra20_ac97_component = {
-	.name		= DRV_NAME,
+	.name			= DRV_NAME,
+	.legacy_dai_naming	= 1,
 };
 
 static bool tegra20_ac97_wr_rd_reg(struct device *dev, unsigned int reg)
@@ -313,6 +315,12 @@ 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");
@@ -346,6 +354,7 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev)
 		}
 	} else {
 		dev_err(&pdev->dev, "no codec-reset GPIO supplied\n");
+		ret = -EINVAL;
 		goto err_clk_put;
 	}
 
@@ -353,6 +362,7 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev)
 					    "nvidia,codec-sync-gpio", 0);
 	if (!gpio_is_valid(ac97->sync_gpio)) {
 		dev_err(&pdev->dev, "no codec-sync GPIO supplied\n");
+		ret = -EINVAL;
 		goto err_clk_put;
 	}
 
@@ -364,12 +374,26 @@ 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);