diff options
Diffstat (limited to 'sound/pci/hda/hda_intel.c')
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index bf8e6f94aebc..f3c447cf67f8 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -392,6 +392,7 @@ struct azx { unsigned int msi :1; unsigned int irq_pending_warned :1; unsigned int via_dmapos_patch :1; /* enable DMA-position fix for VIA */ + unsigned int probing :1; /* codec probing phase */ /* for debugging */ unsigned int last_cmd; /* last issued command (to sync) */ @@ -624,6 +625,14 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus) goto again; } + if (chip->probing) { + /* If this critical timeout happens during the codec probing + * phase, this is likely an access to a non-existing codec + * slot. Better to return an error and reset the system. + */ + return -1; + } + snd_printk(KERN_ERR "hda_intel: azx_get_response timeout, " "switching to single_cmd mode: last cmd=0x%08x\n", chip->last_cmd); @@ -1175,8 +1184,28 @@ static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev) return 0; } +/* + * Probe the given codec address + */ +static int probe_codec(struct azx *chip, int addr) +{ + unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) | + (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID; + unsigned int res; + + chip->probing = 1; + azx_send_cmd(chip->bus, cmd); + res = azx_get_response(chip->bus); + chip->probing = 0; + if (res == -1) + return -EIO; + snd_printdd("hda_intel: codec #%d probed OK\n", addr); + return 0; +} + static int azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec, struct hda_pcm *cpcm); +static void azx_stop_chip(struct azx *chip); /* * Codec initialization @@ -1216,6 +1245,32 @@ static int __devinit azx_codec_create(struct azx *chip, const char *model, max_slots = azx_max_codecs[chip->driver_type]; if (!max_slots) max_slots = AZX_MAX_CODECS; + + /* First try to probe all given codec slots */ + for (c = 0; c < max_slots; c++) { + if ((chip->codec_mask & (1 << c)) & codec_probe_mask) { + if (probe_codec(chip, c) < 0) { + /* Some BIOSen give you wrong codec addresses + * that don't exist + */ + snd_printk(KERN_WARNING + "hda_intel: Codec #%d probe error; " + "disabling it...\n", c); + chip->codec_mask &= ~(1 << c); + /* More badly, accessing to a non-existing + * codec often screws up the controller chip, + * and distrubs the further communications. + * Thus if an error occurs during probing, + * better to reset the controller chip to + * get back to the sanity state. + */ + azx_stop_chip(chip); + azx_init_chip(chip); + } + } + } + + /* Then create codec instances */ for (c = 0; c < max_slots; c++) { if ((chip->codec_mask & (1 << c)) & codec_probe_mask) { struct hda_codec *codec; |