diff options
| author | Nikesh Oswal <noswal@nvidia.com> | 2011-11-18 14:59:12 +0530 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:50:23 -0800 |
| commit | ab8abd6275cfe826002956d13a72d290ae344474 (patch) | |
| tree | dee88307d894907f8894e97d2db1786003230f18 /sound/soc/tegra/tegra30_i2s.c | |
| parent | 9f655d719048c0eda67e041f365325f07ac0eef5 (diff) | |
asoc: tegra: add power management functionality in t30 drivers
add code for handling register save/restore and clocks
disable/enable during suspend/resume
Bug: 862023
Change-Id: I1b709b6bf674c9a2d93c2a21c1f44bbadff64aab
Signed-off-by: Nikesh Oswal <noswal@nvidia.com>
Reviewed-on: http://git-master/r/65478
Reviewed-by: Sumit Bhattacharya <sumitb@nvidia.com>
Reviewed-by: Scott Peterson <speterson@nvidia.com>
Rebase-Id: R2383486dac0892e317dbd25044df59284031b6c4
Diffstat (limited to 'sound/soc/tegra/tegra30_i2s.c')
| -rw-r--r-- | sound/soc/tegra/tegra30_i2s.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c index 78e3ee042b5c..9b2a6be24d1d 100644 --- a/sound/soc/tegra/tegra30_i2s.c +++ b/sound/soc/tegra/tegra30_i2s.c @@ -52,6 +52,9 @@ static struct tegra30_i2s i2scont[TEGRA30_NR_I2S_IFC]; static inline void tegra30_i2s_write(struct tegra30_i2s *i2s, u32 reg, u32 val) { +#ifdef CONFIG_PM + i2s->reg_cache[reg >> 2] = val; +#endif __raw_writel(val, i2s->regs + reg); } @@ -451,6 +454,29 @@ static int tegra30_i2s_probe(struct snd_soc_dai *dai) return 0; } +#ifdef CONFIG_PM +int tegra30_i2s_resume(struct snd_soc_dai *cpu_dai) +{ + struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(cpu_dai); + int i, ret = 0; + + tegra30_i2s_enable_clocks(i2s); + + /*restore the i2s regs*/ + for (i = 0; i < ((TEGRA30_I2S_CIF_TX_CTRL>>2) + 1); i++) + tegra30_i2s_write(i2s, i<<2, i2s->reg_cache[i]); + + tegra30_i2s_disable_clocks(i2s); + + if (i2s->dam_ch_refcount) + ret = tegra30_dam_resume(i2s->dam_ifc); + + return ret; +} +#else +#define tegra30_i2s_resume NULL +#endif + static struct snd_soc_dai_ops tegra30_i2s_dai_ops = { .startup = tegra30_i2s_startup, .shutdown = tegra30_i2s_shutdown, @@ -463,6 +489,7 @@ static struct snd_soc_dai_ops tegra30_i2s_dai_ops = { { \ .name = DRV_NAME "." #id, \ .probe = tegra30_i2s_probe, \ + .resume = tegra30_i2s_resume, \ .playback = { \ .channels_min = 1, \ .channels_max = 2, \ |