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authorVinod Koul <vinod.koul@intel.com>2016-05-12 08:58:53 +0530
committerMark Brown <broonie@kernel.org>2016-05-13 11:43:00 +0100
commit4446085d21e75dd6c0c45577f12db0bd7c7bf35f (patch)
tree2a96c35b59641cb3cf898333398388b0155af77e /include/sound
parentbfb7802a06ac1855096a3f248822e8f943e6574d (diff)
downloadlinux-4446085d21e75dd6c0c45577f12db0bd7c7bf35f.tar.bz2
ALSA: hdac: add link pm and ref counting
The HDA links can be switched off when not is use, similarly command DMA can be stopped as well. This calls for a reference counting mechanism on the link by it's users to manage the link power. The DMA can be turned off when all links are off For this we add two APIs snd_hdac_ext_bus_link_get snd_hdac_ext_bus_link_put They help users to turn up/down link and manage the DMA as well Signed-off-by: Jeeja KP <jeeja.kp@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/hdaudio_ext.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/sound/hdaudio_ext.h b/include/sound/hdaudio_ext.h
index 07fa59237feb..b9593b201599 100644
--- a/include/sound/hdaudio_ext.h
+++ b/include/sound/hdaudio_ext.h
@@ -14,6 +14,8 @@
* @gtscap: gts capabilities pointer
* @drsmcap: dma resume capabilities pointer
* @hlink_list: link list of HDA links
+ * @lock: lock for link mgmt
+ * @cmd_dma_state: state of cmd DMAs: CORB and RIRB
*/
struct hdac_ext_bus {
struct hdac_bus bus;
@@ -27,6 +29,9 @@ struct hdac_ext_bus {
void __iomem *drsmcap;
struct list_head hlink_list;
+
+ struct mutex lock;
+ bool cmd_dma_state;
};
int snd_hdac_ext_bus_init(struct hdac_ext_bus *sbus, struct device *dev,
@@ -142,6 +147,9 @@ struct hdac_ext_link {
void __iomem *ml_addr; /* link output stream reg pointer */
u32 lcaps; /* link capablities */
u16 lsdiid; /* link sdi identifier */
+
+ int ref_count;
+
struct list_head list;
};
@@ -154,6 +162,11 @@ void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
int stream);
+int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
+ struct hdac_ext_link *link);
+int snd_hdac_ext_bus_link_put(struct hdac_ext_bus *ebus,
+ struct hdac_ext_link *link);
+
/* update register macro */
#define snd_hdac_updatel(addr, reg, mask, val) \
writel(((readl(addr + reg) & ~(mask)) | (val)), \