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Subject[PATCH v3 08/15] ASoC: tegra: Add audio mclk control through clk_out_1 and extern1
Date
Current ASoC driver uses extern1 as cdev1 clock from Tegra30 onwards
through device tree.

Actual audio mclk is clk_out_1 and to use PLLA for mclk rate control,
need to clk_out_1_mux parent to extern1 and extern1 parent to PLLA_OUT0.

Currently Tegra clock driver init sets the parents and enables both
clk_out_1 and extern1 clocks. But these clocks parent and enables should
be controlled by ASoC driver.

Clock parents can be specified in device tree using assigned-clocks
and assigned-clock-parents.

To enable audio mclk, both clk_out_1 and extern1 clocks need to be
enabled.

This patch configures parents for clk_out_1 and extern1 clocks if device
tree does not specify clock parents inorder to support old device tree
and controls mclk using both clk_out_1 and extern1 clocks.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
sound/soc/tegra/tegra_asoc_utils.c | 66 ++++++++++++++++++++++++++++++++++++++
sound/soc/tegra/tegra_asoc_utils.h | 1 +
2 files changed, 67 insertions(+)

diff --git a/sound/soc/tegra/tegra_asoc_utils.c b/sound/soc/tegra/tegra_asoc_utils.c
index 536a578e9512..8e3a3740df7c 100644
--- a/sound/soc/tegra/tegra_asoc_utils.c
+++ b/sound/soc/tegra/tegra_asoc_utils.c
@@ -60,6 +60,7 @@ int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
data->set_mclk = 0;

clk_disable_unprepare(data->clk_cdev1);
+ clk_disable_unprepare(data->clk_extern1);
clk_disable_unprepare(data->clk_pll_a_out0);
clk_disable_unprepare(data->clk_pll_a);

@@ -89,6 +90,14 @@ int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
return err;
}

+ if (!IS_ERR_OR_NULL(data->clk_extern1)) {
+ err = clk_prepare_enable(data->clk_extern1);
+ if (err) {
+ dev_err(data->dev, "Can't enable extern1: %d\n", err);
+ return err;
+ }
+ }
+
err = clk_prepare_enable(data->clk_cdev1);
if (err) {
dev_err(data->dev, "Can't enable cdev1: %d\n", err);
@@ -109,6 +118,7 @@ int tegra_asoc_utils_set_ac97_rate(struct tegra_asoc_utils_data *data)
int err;

clk_disable_unprepare(data->clk_cdev1);
+ clk_disable_unprepare(data->clk_extern1);
clk_disable_unprepare(data->clk_pll_a_out0);
clk_disable_unprepare(data->clk_pll_a);

@@ -142,6 +152,14 @@ int tegra_asoc_utils_set_ac97_rate(struct tegra_asoc_utils_data *data)
return err;
}

+ if (!IS_ERR_OR_NULL(data->clk_extern1)) {
+ err = clk_prepare_enable(data->clk_extern1);
+ if (err) {
+ dev_err(data->dev, "Can't enable extern1: %d\n", err);
+ return err;
+ }
+ }
+
err = clk_prepare_enable(data->clk_cdev1);
if (err) {
dev_err(data->dev, "Can't enable cdev1: %d\n", err);
@@ -158,6 +176,7 @@ EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_ac97_rate);
int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
struct device *dev)
{
+ struct clk *clk_out_1_mux;
int ret;

data->dev = dev;
@@ -196,6 +215,51 @@ int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
goto err_put_pll_a_out0;
}

+ /*
+ * If clock parents are not set in DT, configure here to use clk_out_1
+ * as mclk and extern1 as parent for Tegra30 and higher.
+ */
+ if (!of_find_property(dev->of_node, "assigned-clock-parents", NULL) &&
+ data->soc > TEGRA_ASOC_UTILS_SOC_TEGRA20) {
+ data->clk_extern1 = clk_get_sys("clk_out_1", "extern1");
+ if (IS_ERR(data->clk_extern1)) {
+ dev_err(data->dev, "Can't retrieve clk extern1\n");
+ ret = PTR_ERR(data->clk_extern1);
+ goto err_put_cdev1;
+ }
+
+ ret = clk_set_parent(data->clk_extern1, data->clk_pll_a_out0);
+ if (ret < 0) {
+ dev_err(data->dev,
+ "Set parent failed for clk extern1: %d\n",
+ ret);
+ goto err_put_cdev1;
+ }
+
+ clk_out_1_mux = clk_get_sys(NULL, "clk_out_1_mux");
+ if (IS_ERR(clk_out_1_mux)) {
+ dev_err(data->dev, "Can't retrieve clk clk_out_1_mux\n");
+ ret = PTR_ERR(clk_out_1_mux);
+ goto err_put_cdev1;
+ }
+
+ ret = clk_set_parent(clk_out_1_mux, data->clk_extern1);
+ if (ret < 0) {
+ dev_err(data->dev,
+ "Set parent failed for clk_out_1_mux: %d\n",
+ ret);
+ clk_put(clk_out_1_mux);
+ goto err_put_cdev1;
+ }
+
+ data->clk_cdev1 = clk_get_sys(NULL, "clk_out_1");
+ if (IS_ERR(data->clk_cdev1)) {
+ dev_err(data->dev, "Can't retrieve clk clk_out_1\n");
+ ret = PTR_ERR(data->clk_cdev1);
+ goto err_put_cdev1;
+ }
+ }
+
ret = tegra_asoc_utils_set_rate(data, 44100, 256 * 44100);
if (ret)
goto err_put_cdev1;
@@ -215,6 +279,8 @@ EXPORT_SYMBOL_GPL(tegra_asoc_utils_init);

void tegra_asoc_utils_fini(struct tegra_asoc_utils_data *data)
{
+ if (!IS_ERR_OR_NULL(data->clk_extern1))
+ clk_put(data->clk_extern1);
clk_put(data->clk_cdev1);
clk_put(data->clk_pll_a_out0);
clk_put(data->clk_pll_a);
diff --git a/sound/soc/tegra/tegra_asoc_utils.h b/sound/soc/tegra/tegra_asoc_utils.h
index 0c13818dee75..5f2b96478caf 100644
--- a/sound/soc/tegra/tegra_asoc_utils.h
+++ b/sound/soc/tegra/tegra_asoc_utils.h
@@ -25,6 +25,7 @@ struct tegra_asoc_utils_data {
struct clk *clk_pll_a;
struct clk *clk_pll_a_out0;
struct clk *clk_cdev1;
+ struct clk *clk_extern1;
int set_baseclock;
int set_mclk;
};
--
2.7.4
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