diff mbox series

[v5,01/17] ASoC: tegra20: ac97: Add reset control

Message ID 20210314154459.15375-2-digetx@gmail.com
State Accepted
Commit a46b78247b852345ae4458711a4aec6744a7838c
Headers show
Series Fix reset controls and RPM of NVIDIA Tegra ASoC drivers | expand

Commit Message

Dmitry Osipenko March 14, 2021, 3:44 p.m. UTC 
Tegra20 AC97 driver doesn't manage the AC97 controller reset, relying on
implicit deassertion of the reset by tegra-clk driver, which needs to be
fixed since this behaviour is unacceptable by other Tegra drivers. Add
explicit reset control to the Tegra20 AC97 driver.

Note that AC97 reset was always specified in Tegra20 device-tree, hence
DTB ABI changes aren't required.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 sound/soc/tegra/tegra20_ac97.c | 21 +++++++++++++++++++++
 sound/soc/tegra/tegra20_ac97.h |  1 +
 2 files changed, 22 insertions(+)
diff mbox series

Patch

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;