diff options
| author | Alison Wang <b18965@freescale.com> | 2014-10-27 07:20:45 (GMT) |
|---|---|---|
| committer | Matthew Weigel <Matthew.Weigel@freescale.com> | 2014-12-11 18:40:00 (GMT) |
| commit | 2d0309396d98661a929c81145dbe00d15b54c332 (patch) | |
| tree | 6f987cbad6e67e6b292adfed025e6237b7c3e649 /sound | |
| parent | cee34118b14fc991855095aea08748ed041ebe01 (diff) | |
| download | linux-fsl-qoriq-2d0309396d98661a929c81145dbe00d15b54c332.tar.xz | |
audio: sai: Add Power Management support
This patch adds Power Management support for SAI.
Activate regmap cache with REGCACHE_RBTREE, and use
regmap cache code to save and restore registers in
suspend and resume. The Transmit Control Register
(TCSR) and Receive Control Register(RCSR) should
be volatile registers.
Signed-off-by: Alison Wang <alison.wang@freescale.com>
---
This patch has been sent to upstream for review:
https://patchwork.kernel.org/patch/5183621/.
Change-Id: I46a53b91fa005d9833e289d06430e26569897b2d
Reviewed-on: http://git.am.freescale.net:8181/22361
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Jingchang Lu <jingchang.lu@freescale.com>
Reviewed-by: Dongsheng Wang <dongsheng.wang@freescale.com>
Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/fsl/fsl_sai.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index ff86daf..3653b25 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -441,9 +441,11 @@ static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg) static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { + case FSL_SAI_TCSR: case FSL_SAI_TFR: - case FSL_SAI_RFR: case FSL_SAI_TDR: + case FSL_SAI_RCSR: + case FSL_SAI_RFR: case FSL_SAI_RDR: return true; default: @@ -485,6 +487,7 @@ static struct regmap_config fsl_sai_regmap_config = { .readable_reg = fsl_sai_readable_reg, .volatile_reg = fsl_sai_volatile_reg, .writeable_reg = fsl_sai_writeable_reg, + .cache_type = REGCACHE_RBTREE, }; static bool fsl_sai_filter(struct dma_chan *chan, void *param) @@ -587,6 +590,33 @@ static int fsl_sai_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int fsl_sai_suspend(struct device *dev) +{ + struct fsl_sai *sai = dev_get_drvdata(dev); + + regcache_cache_only(sai->regmap, true); + regcache_mark_dirty(sai->regmap); + + return 0; +} + +static int fsl_sai_resume(struct device *dev) +{ + struct fsl_sai *sai = dev_get_drvdata(dev); + + /* Restore all registers */ + regcache_cache_only(sai->regmap, false); + regcache_sync(sai->regmap); + + return 0; +}; +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops fsl_sai_pm = { + SET_SYSTEM_SLEEP_PM_OPS(fsl_sai_suspend, fsl_sai_resume) +}; + static const struct of_device_id fsl_sai_ids[] = { { .compatible = "fsl,vf610-sai", }, { /* sentinel */ } @@ -599,6 +629,7 @@ static struct platform_driver fsl_sai_driver = { .name = "fsl-sai", .owner = THIS_MODULE, .of_match_table = fsl_sai_ids, + .pm = &fsl_sai_pm, }, }; module_platform_driver(fsl_sai_driver); |