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[ARM] tegra_i2s_audio: add suspend/resume handlers

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The resume handler restores i2s state, which gets lost on LP0

Signed-off-by: Iliyan Malchev <malchev@google.com>
This commit is contained in:
Chris Fries
2010-10-14 16:31:52 -05:00
committed by Iliyan Malchev
parent 810694cfa9
commit eee4c1fd23
1 changed files with 48 additions and 1 deletions
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49
arch/arm/mach-tegra/tegra_i2s_audio.c
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@@ -43,7 +43,7 @@
#include <linux/pm_qos_params.h>
#include <linux/delay.h>
#include <linux/tegra_audio.h>
#include <linux/pm.h>
#include <mach/dma.h>
#include <mach/iomap.h>
#include <mach/i2s.h>
@@ -2380,12 +2380,59 @@ static int tegra_audio_probe(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int tegra_audio_suspend(struct platform_device *pdev, pm_message_t mesg)
{
/* dev_info(&pdev->dev, "%s\n", __func__); */
return 0;
}
static int tegra_audio_resume(struct platform_device *pdev)
{
struct tegra_audio_platform_data *pdata = pdev->dev.platform_data;
struct audio_driver_state *state = pdata->driver_data;
/* dev_info(&pdev->dev, "%s\n", __func__); */
if (!state)
return -ENOMEM;
/* disable interrupts from I2S */
i2s_fifo_clear(state->i2s_base, I2S_FIFO_TX);
i2s_fifo_clear(state->i2s_base, I2S_FIFO_RX);
i2s_enable_fifos(state->i2s_base, 0);
i2s_set_left_right_control_polarity(state->i2s_base, 0); /* default */
if (state->pdata->master)
i2s_set_channel_bit_count(state->i2s_base, 44100,
state->pdata->i2s_clk_rate);
i2s_set_master(state->i2s_base, state->pdata->master);
i2s_set_fifo_mode(state->i2s_base, I2S_FIFO_TX, 1);
i2s_set_fifo_mode(state->i2s_base, I2S_FIFO_RX, 0);
if (state->bit_format == TEGRA_AUDIO_BIT_FORMAT_DSP)
i2s_set_bit_format(state->i2s_base, I2S_BIT_FORMAT_DSP);
else
i2s_set_bit_format(state->i2s_base, state->pdata->mode);
i2s_set_bit_size(state->i2s_base, state->pdata->bit_size);
i2s_set_fifo_format(state->i2s_base, state->pdata->fifo_fmt);
return 0;
}
#endif /* CONFIG_PM */
static struct platform_driver tegra_audio_driver = {
.driver = {
.name = "i2s",
.owner = THIS_MODULE,
},
.probe = tegra_audio_probe,
#ifdef CONFIG_PM
.suspend = tegra_audio_suspend,
.resume = tegra_audio_resume,
#endif
};
static int __init tegra_audio_init(void)