Commit 919ad49c authored by Lucas Stach's avatar Lucas Stach Committed by Mark Brown
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ASoC: tegra: add function to set ac97 rate 



AC97 uses a fixed rate, unrelated to the sample rate. Add a function to
make the setup more trivial.

Signed-off-by: default avatarLucas Stach <dev@lynxeye.de>
Acked-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent a49f0d1e

sound/soc/tegra/tegra_asoc_utils.c

+53 −0
Original line number Diff line number Diff line
@@ -112,6 +112,59 @@ int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate, 
}

EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_rate);



int tegra_asoc_utils_set_ac97_rate(struct tegra_asoc_utils_data *data)

{

	const int pll_rate = 73728000;

	const int ac97_rate = 24576000;

	int err;



	clk_disable_unprepare(data->clk_cdev1);

	clk_disable_unprepare(data->clk_pll_a_out0);

	clk_disable_unprepare(data->clk_pll_a);



	/*

	 * AC97 rate is fixed at 24.576MHz and is used for both the host

	 * controller and the external codec

	 */

	err = clk_set_rate(data->clk_pll_a, pll_rate);

	if (err) {

		dev_err(data->dev, "Can't set pll_a rate: %d\n", err);

		return err;

	}



	err = clk_set_rate(data->clk_pll_a_out0, ac97_rate);

	if (err) {

		dev_err(data->dev, "Can't set pll_a_out0 rate: %d\n", err);

		return err;

	}



	/* Don't set cdev1/extern1 rate; it's locked to pll_a_out0 */



	err = clk_prepare_enable(data->clk_pll_a);

	if (err) {

		dev_err(data->dev, "Can't enable pll_a: %d\n", err);

		return err;

	}



	err = clk_prepare_enable(data->clk_pll_a_out0);

	if (err) {

		dev_err(data->dev, "Can't enable pll_a_out0: %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);

		return err;

	}



	data->set_baseclock = pll_rate;

	data->set_mclk = ac97_rate;



	return 0;

}

EXPORT_SYMBOL_GPL(tegra_asoc_utils_set_ac97_rate);



int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,

			  struct device *dev)

{

sound/soc/tegra/tegra_asoc_utils.h

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ struct tegra_asoc_utils_data { 


int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,

			      int mclk);

int tegra_asoc_utils_set_ac97_rate(struct tegra_asoc_utils_data *data);

int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,

			  struct device *dev);

void tegra_asoc_utils_fini(struct tegra_asoc_utils_data *data);

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