ASoC: DaVinci: Update suspend/resume support for McASP driver
Add clock enable and disable calls to resume and suspend respectively.
Also add a member to the audio device data structure which tracks the clock
status.
Tested on DA850/OMAP-L138 EVM. For the purpose of testing, the patches[1] which
add suspend-to-RAM support to DA850/OMAP-L138 SoC were applied.
[1] http://linux.davincidsp.com/pipermail/davinci-linux-open-source/
2009-November/016958.html
Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 0a302e1..a613bbb 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -767,14 +767,27 @@
int ret = 0;
switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
+ if (!dev->clk_active) {
+ clk_enable(dev->clk);
+ dev->clk_active = 1;
+ }
+ /* Fall through */
+ case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
davinci_mcasp_start(dev, substream->stream);
break;
- case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
+ davinci_mcasp_stop(dev, substream->stream);
+ if (dev->clk_active) {
+ clk_disable(dev->clk);
+ dev->clk_active = 0;
+ }
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
davinci_mcasp_stop(dev, substream->stream);
break;
@@ -866,6 +879,7 @@
}
clk_enable(dev->clk);
+ dev->clk_active = 1;
dev->base = (void __iomem *)IO_ADDRESS(mem->start);
dev->op_mode = pdata->op_mode;