From aa2936f5fe060e95ae06685149645b234085a468 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 26 May 2009 16:07:57 +0200 Subject: ALSA: hda - Support sync after writing a verb This patch adds a debug mode to make the codec communication synchronous. Define SND_HDA_SUPPORT_SYNC_WRITE in hda_codec.c, and the call of snd_hda_codec_write*() will become synchronous, i.e. wait for the reply from the codec at each time issuing a verb. Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_codec.c | 113 +++++++++++++++++++++++++--------------------- 1 file changed, 61 insertions(+), 52 deletions(-) (limited to 'sound/pci/hda') diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 77385de0174..d1d5fb9d7af 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -158,6 +158,38 @@ make_codec_cmd(struct hda_codec *codec, hda_nid_t nid, int direct, return val; } +/* + * Send and receive a verb + */ +static int codec_exec_verb(struct hda_codec *codec, unsigned int cmd, + unsigned int *res) +{ + struct hda_bus *bus = codec->bus; + int err, repeated = 0; + + if (res) + *res = -1; + snd_hda_power_up(codec); + mutex_lock(&bus->cmd_mutex); + again: + err = bus->ops.command(bus, cmd); + if (!err) { + if (res) { + *res = bus->ops.get_response(bus); + if (*res == -1 && bus->rirb_error) { + if (repeated++ < 1) { + snd_printd(KERN_WARNING "hda_codec: " + "Trying verb 0x%08x again\n", cmd); + goto again; + } + } + } + } + mutex_unlock(&bus->cmd_mutex); + snd_hda_power_down(codec); + return err; +} + /** * snd_hda_codec_read - send a command and get the response * @codec: the HDA codec @@ -174,31 +206,18 @@ unsigned int snd_hda_codec_read(struct hda_codec *codec, hda_nid_t nid, int direct, unsigned int verb, unsigned int parm) { - struct hda_bus *bus = codec->bus; - unsigned int cmd, res; - int repeated = 0; - - cmd = make_codec_cmd(codec, nid, direct, verb, parm); - snd_hda_power_up(codec); - mutex_lock(&bus->cmd_mutex); - again: - if (!bus->ops.command(bus, cmd)) { - res = bus->ops.get_response(bus); - if (res == -1 && bus->rirb_error) { - if (repeated++ < 1) { - snd_printd(KERN_WARNING "hda_codec: " - "Trying verb 0x%08x again\n", cmd); - goto again; - } - } - } else - res = (unsigned int)-1; - mutex_unlock(&bus->cmd_mutex); - snd_hda_power_down(codec); + unsigned cmd = make_codec_cmd(codec, nid, direct, verb, parm); + unsigned int res; + codec_exec_verb(codec, cmd, &res); return res; } EXPORT_SYMBOL_HDA(snd_hda_codec_read); +/* Define the below to send and receive verbs synchronously. + * If you often get any codec communication errors, this is worth to try. + */ +/* #define SND_HDA_SUPPORT_SYNC_WRITE */ + /** * snd_hda_codec_write - send a single command without waiting for response * @codec: the HDA codec @@ -214,17 +233,13 @@ EXPORT_SYMBOL_HDA(snd_hda_codec_read); int snd_hda_codec_write(struct hda_codec *codec, hda_nid_t nid, int direct, unsigned int verb, unsigned int parm) { - struct hda_bus *bus = codec->bus; + unsigned int cmd = make_codec_cmd(codec, nid, direct, verb, parm); +#ifdef SND_HDA_SUPPORT_SYNC_WRITE unsigned int res; - int err; - - res = make_codec_cmd(codec, nid, direct, verb, parm); - snd_hda_power_up(codec); - mutex_lock(&bus->cmd_mutex); - err = bus->ops.command(bus, res); - mutex_unlock(&bus->cmd_mutex); - snd_hda_power_down(codec); - return err; + return codec_exec_verb(codec, cmd, &res); +#else + return codec_exec_verb(codec, cmd, NULL); +#endif } EXPORT_SYMBOL_HDA(snd_hda_codec_write); @@ -2281,28 +2296,22 @@ EXPORT_SYMBOL_HDA(snd_hda_create_spdif_in_ctls); int snd_hda_codec_write_cache(struct hda_codec *codec, hda_nid_t nid, int direct, unsigned int verb, unsigned int parm) { - struct hda_bus *bus = codec->bus; - unsigned int res; - int err; + int err = snd_hda_codec_write(codec, nid, direct, verb, parm); + struct hda_cache_head *c; + u32 key; - res = make_codec_cmd(codec, nid, direct, verb, parm); - snd_hda_power_up(codec); - mutex_lock(&bus->cmd_mutex); - err = bus->ops.command(bus, res); - if (!err) { - struct hda_cache_head *c; - u32 key; - /* parm may contain the verb stuff for get/set amp */ - verb = verb | (parm >> 8); - parm &= 0xff; - key = build_cmd_cache_key(nid, verb); - c = get_alloc_hash(&codec->cmd_cache, key); - if (c) - c->val = parm; - } - mutex_unlock(&bus->cmd_mutex); - snd_hda_power_down(codec); - return err; + if (err < 0) + return err; + /* parm may contain the verb stuff for get/set amp */ + verb = verb | (parm >> 8); + parm &= 0xff; + key = build_cmd_cache_key(nid, verb); + mutex_lock(&codec->bus->cmd_mutex); + c = get_alloc_hash(&codec->cmd_cache, key); + if (c) + c->val = parm; + mutex_unlock(&codec->bus->cmd_mutex); + return 0; } EXPORT_SYMBOL_HDA(snd_hda_codec_write_cache); -- cgit v1.2.3