[ALSA] hda-codec - introduce command register cache
This patch adds the cache for codec command registers.
snd_hda_codec_write_cache() and snd_hda_sequence_write_cache() do
the write operations with caching, which values can be resumed via
snd_hda_codec_resume_cache().
The patch introduces only the framework, and no codec code is using
this cache yet. It'll be implemented in the following patch.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 46f8ab1..6652a53 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -510,6 +510,7 @@
if (codec->patch_ops.free)
codec->patch_ops.free(codec);
free_hda_cache(&codec->amp_cache);
+ free_hda_cache(&codec->cmd_cache);
kfree(codec->wcaps);
kfree(codec);
}
@@ -548,6 +549,7 @@
codec->addr = codec_addr;
mutex_init(&codec->spdif_mutex);
init_hda_cache(&codec->amp_cache, sizeof(struct hda_amp_info));
+ init_hda_cache(&codec->cmd_cache, sizeof(struct hda_cache_head));
list_add_tail(&codec->list, &bus->codec_list);
bus->caddr_tbl[codec_addr] = codec;
@@ -840,6 +842,29 @@
return 1;
}
+/* resume the all amp commands from the cache */
+void snd_hda_codec_resume_amp(struct hda_codec *codec)
+{
+ struct hda_amp_info *buffer = codec->amp_cache.buffer;
+ int i;
+
+ for (i = 0; i < codec->amp_cache.size; i++, buffer++) {
+ u32 key = buffer->head.key;
+ hda_nid_t nid;
+ unsigned int idx, dir, ch;
+ if (!key)
+ continue;
+ nid = key & 0xff;
+ idx = (key >> 16) & 0xff;
+ dir = (key >> 24) & 0xff;
+ for (ch = 0; ch < 2; ch++) {
+ if (!(buffer->head.val & INFO_AMP_VOL(ch)))
+ continue;
+ put_vol_mute(codec, buffer, nid, ch, dir, idx,
+ buffer->vol[ch]);
+ }
+ }
+}
/*
* AMP control callbacks
@@ -1458,6 +1483,72 @@
}
+/* build a 32bit cache key with the widget id and the command parameter */
+#define build_cmd_cache_key(nid, verb) ((verb << 8) | nid)
+#define get_cmd_cache_nid(key) ((key) & 0xff)
+#define get_cmd_cache_cmd(key) (((key) >> 8) & 0xffff)
+
+/**
+ * snd_hda_codec_write_cache - send a single command with caching
+ * @codec: the HDA codec
+ * @nid: NID to send the command
+ * @direct: direct flag
+ * @verb: the verb to send
+ * @parm: the parameter for the verb
+ *
+ * Send a single command without waiting for response.
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hda_codec_write_cache(struct hda_codec *codec, hda_nid_t nid,
+ int direct, unsigned int verb, unsigned int parm)
+{
+ int err;
+ mutex_lock(&codec->bus->cmd_mutex);
+ err = codec->bus->ops.command(codec, nid, direct, verb, parm);
+ if (!err) {
+ struct hda_cache_head *c;
+ u32 key = build_cmd_cache_key(nid, verb);
+ c = get_alloc_hash(&codec->cmd_cache, key);
+ if (c)
+ c->val = parm;
+ }
+ mutex_unlock(&codec->bus->cmd_mutex);
+ return err;
+}
+
+/* resume the all commands from the cache */
+void snd_hda_codec_resume_cache(struct hda_codec *codec)
+{
+ struct hda_cache_head *buffer = codec->cmd_cache.buffer;
+ int i;
+
+ for (i = 0; i < codec->cmd_cache.size; i++, buffer++) {
+ u32 key = buffer->key;
+ if (!key)
+ continue;
+ snd_hda_codec_write(codec, get_cmd_cache_nid(key), 0,
+ get_cmd_cache_cmd(key), buffer->val);
+ }
+}
+
+/**
+ * snd_hda_sequence_write_cache - sequence writes with caching
+ * @codec: the HDA codec
+ * @seq: VERB array to send
+ *
+ * Send the commands sequentially from the given array.
+ * Thte commands are recorded on cache for power-save and resume.
+ * The array must be terminated with NID=0.
+ */
+void snd_hda_sequence_write_cache(struct hda_codec *codec,
+ const struct hda_verb *seq)
+{
+ for (; seq->nid; seq++)
+ snd_hda_codec_write_cache(codec, seq->nid, 0, seq->verb,
+ seq->param);
+}
+
/*
* set power state of the codec
*/