Implement ASoC suspend and resume callbacks to save and restore register state, to support platforms where the power is disabled during suspend.
Signed-off-by: Ed Blake ed.blake@sondrel.com --- sound/soc/img/img-spdif-in.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/sound/soc/img/img-spdif-in.c b/sound/soc/img/img-spdif-in.c index 8adfd65..d74bcc5 100644 --- a/sound/soc/img/img-spdif-in.c +++ b/sound/soc/img/img-spdif-in.c @@ -82,6 +82,8 @@ struct img_spdif_in { unsigned int single_freq; unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN]; bool active; + u32 suspend_clkgen; + u32 suspend_ctl;
/* Write-only registers */ unsigned int aclkgen_regs[IMG_SPDIF_IN_NUM_ACLKGEN]; @@ -676,8 +678,38 @@ static int img_spdif_in_dai_probe(struct snd_soc_dai *dai) return 0; }
+static int img_spdif_in_dai_suspend(struct snd_soc_dai *dai) +{ + struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai); + + spdif->suspend_clkgen = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CLKGEN); + spdif->suspend_ctl = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL); + + clk_disable_unprepare(spdif->clk_sys); + + return 0; +} + +static int img_spdif_in_dai_resume(struct snd_soc_dai *dai) +{ + struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai); + int i; + + clk_prepare_enable(spdif->clk_sys); + + for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) + img_spdif_in_aclkgen_writel(spdif, i); + + img_spdif_in_writel(spdif, spdif->suspend_clkgen, IMG_SPDIF_IN_CLKGEN); + img_spdif_in_writel(spdif, spdif->suspend_ctl, IMG_SPDIF_IN_CTL); + + return 0; +} + static struct snd_soc_dai_driver img_spdif_in_dai = { .probe = img_spdif_in_dai_probe, + .suspend = img_spdif_in_dai_suspend, + .resume = img_spdif_in_dai_resume, .capture = { .channels_min = 2, .channels_max = 2,