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authorEd Blake <ed.blake@sondrel.com>2017-10-06 17:52:27 +0300
committerMark Brown <broonie@kernel.org>2017-10-09 11:43:39 +0300
commit9b4acd33dd64e84be6db9552b6d43979c05135b1 (patch)
tree3ca2e96bf192680b2484193264b398f71ca53b1b /sound/soc/img
parentf65bb92ca12e72c6ebed20dacaa75ee1f2f0735a (diff)
downloadlinux-9b4acd33dd64e84be6db9552b6d43979c05135b1.tar.xz
ASoC: img-i2s-out: Add suspend / resume handling
Implement suspend and resume callbacks to save and restore register state, to support platforms where the power is disabled during suspend. In future the driver could be converted to use regmap which would simplify the suspend and resume code. Signed-off-by: Ed Blake <ed.blake@sondrel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/img')
-rw-r--r--sound/soc/img/img-i2s-out.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/sound/soc/img/img-i2s-out.c b/sound/soc/img/img-i2s-out.c
index adc6902fcbd4..1d831c625fe2 100644
--- a/sound/soc/img/img-i2s-out.c
+++ b/sound/soc/img/img-i2s-out.c
@@ -63,6 +63,8 @@ struct img_i2s_out {
unsigned int active_channels;
struct reset_control *rst;
struct snd_soc_dai_driver dai_driver;
+ u32 suspend_ctl;
+ u32 *suspend_ch_ctl;
};
static int img_i2s_out_runtime_suspend(struct device *dev)
@@ -471,6 +473,13 @@ static int img_i2s_out_probe(struct platform_device *pdev)
if (ret)
return ret;
+ i2s->suspend_ch_ctl = devm_kzalloc(dev,
+ sizeof(*i2s->suspend_ch_ctl) * i2s->max_i2s_chan, GFP_KERNEL);
+ if (!i2s->suspend_ch_ctl) {
+ ret = -ENOMEM;
+ goto err_clk_disable;
+ }
+
reg = IMG_I2S_OUT_CTL_FRM_SIZE_MASK;
img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);
@@ -520,6 +529,7 @@ err_suspend:
img_i2s_out_runtime_suspend(&pdev->dev);
err_pm_disable:
pm_runtime_disable(&pdev->dev);
+err_clk_disable:
clk_disable_unprepare(i2s->clk_sys);
return ret;
@@ -538,6 +548,55 @@ static int img_i2s_out_dev_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int img_i2s_out_suspend(struct device *dev)
+{
+ struct img_i2s_out *i2s = dev_get_drvdata(dev);
+ int i, ret;
+ u32 reg;
+
+ if (pm_runtime_status_suspended(dev)) {
+ ret = img_i2s_out_runtime_resume(dev);
+ if (ret)
+ return ret;
+ }
+
+ for (i = 0; i < i2s->max_i2s_chan; i++) {
+ reg = img_i2s_out_ch_readl(i2s, i, IMG_I2S_OUT_CH_CTL);
+ i2s->suspend_ch_ctl[i] = reg;
+ }
+
+ i2s->suspend_ctl = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
+
+ img_i2s_out_runtime_suspend(dev);
+
+ return 0;
+}
+
+static int img_i2s_out_resume(struct device *dev)
+{
+ struct img_i2s_out *i2s = dev_get_drvdata(dev);
+ int i, ret;
+ u32 reg;
+
+ ret = img_i2s_out_runtime_resume(dev);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < i2s->max_i2s_chan; i++) {
+ reg = i2s->suspend_ch_ctl[i];
+ img_i2s_out_ch_writel(i2s, i, reg, IMG_I2S_OUT_CH_CTL);
+ }
+
+ img_i2s_out_writel(i2s, i2s->suspend_ctl, IMG_I2S_OUT_CTL);
+
+ if (pm_runtime_status_suspended(dev))
+ img_i2s_out_runtime_suspend(dev);
+
+ return 0;
+}
+#endif
+
static const struct of_device_id img_i2s_out_of_match[] = {
{ .compatible = "img,i2s-out" },
{}
@@ -547,6 +606,7 @@ MODULE_DEVICE_TABLE(of, img_i2s_out_of_match);
static const struct dev_pm_ops img_i2s_out_pm_ops = {
SET_RUNTIME_PM_OPS(img_i2s_out_runtime_suspend,
img_i2s_out_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(img_i2s_out_suspend, img_i2s_out_resume)
};
static struct platform_driver img_i2s_out_driver = {