McBSP fucntional clock is not disabled when suspend is triggerd which
prevents PER domain entering target low-power state. To fix the problem:
1. Disable/enable McBSP functional clock for suspend/resume.
2. In addition, reconfigure McBSP, this is needed when systerm comes out of OFF state.
Signed-off-by: Jane Wang <jwang@xxxxxx>
---
arch/arm/plat-omap/include/mach/mcbsp.h | 2 ++
arch/arm/plat-omap/mcbsp.c | 27 +++++++++++++++++++++++++++
sound/soc/omap/omap-mcbsp.c | 14 ++++++++++++--
3 files changed, 41 insertions(+), 2 deletions(-)
diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index e0d6eca..94e1c66 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -440,6 +440,8 @@ static inline int omap_mcbsp_get_dma_op_mode(unsigned int id) { return 0; }
#endif
int omap_mcbsp_request(unsigned int id);
void omap_mcbsp_free(unsigned int id);
+void omap_mcbsp_disable_fclk(unsigned int id);
+void omap_mcbsp_enable_fclk(unsigned int id);
void omap_mcbsp_start(unsigned int id, int tx, int rx);
void omap_mcbsp_stop(unsigned int id, int tx, int rx);
void omap_mcbsp_xmit_word(unsigned int id, u32 word);
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index e664b91..bfe3c61 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -459,6 +459,33 @@ int omap_mcbsp_request(unsigned int id)
}
EXPORT_SYMBOL(omap_mcbsp_request);
+void omap_mcbsp_disable_fclk(unsigned int id)
+{
+ struct omap_mcbsp *mcbsp;
+
+ if (!omap_mcbsp_check_valid_id(id)) {
+ printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+ return;
+ }
+ mcbsp = id_to_mcbsp_ptr(id);
+ clk_disable(mcbsp->fclk);
+}
+EXPORT_SYMBOL(omap_mcbsp_disable_fclk);
+
+
+void omap_mcbsp_enable_fclk(unsigned int id)
+{
+ struct omap_mcbsp *mcbsp;
+
+ if (!omap_mcbsp_check_valid_id(id)) {
+ printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+ return;
+ }
+ mcbsp = id_to_mcbsp_ptr(id);
+ clk_enable(mcbsp->fclk);
+}
+EXPORT_SYMBOL(omap_mcbsp_enable_fclk);
+
void omap_mcbsp_free(unsigned int id)
{
struct omap_mcbsp *mcbsp;
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 45be942..e56b5ff 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -229,18 +229,28 @@ static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
mcbsp_data->active++;
omap_mcbsp_start(mcbsp_data->bus_id, play, !play);
break;
+ case SNDRV_PCM_TRIGGER_RESUME:
+ mcbsp_data->active++;
+ omap_mcbsp_enable_fclk(mcbsp_data->bus_id);
+ omap_mcbsp_config(mcbsp_data->bus_id,
+ &mcbsp_data->regs);
+ omap_mcbsp_start(mcbsp_data->bus_id, play, !play);
+ break;
case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
omap_mcbsp_stop(mcbsp_data->bus_id, play, !play);
mcbsp_data->active--;
break;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ omap_mcbsp_stop(mcbsp_data->bus_id, play, !play);
+ omap_mcbsp_disable_fclk(mcbsp_data->bus_id);
+ mcbsp_data->active--;
+ break;
default:
err = -EINVAL;
}
--
1.5.4.3
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