ALSA: hda - Retry codec-verbs at errors

The current error-recovery scheme for the codec communication errors
doesn't work always well.  Especially falling back to the
single-command mode causes the fatal problem on many systems.

In this patch, the problematic verb is re-issued again after the error
(even with polling mode) instead of the single-cmd mode.  The
single-cmd mode will be used only when specified via the command
option explicitly, mainly just for testing.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 3d8bf39..1736ccb 100644 (file)
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -174,14 +174,23 @@ unsigned int snd_hda_codec_read(struct hda_codec *codec, hda_nid_t nid,
                                unsigned int verb, unsigned int parm)
 {
        struct hda_bus *bus = codec->bus;
-       unsigned int res;
+       unsigned int cmd, res;
+       int repeated = 0;
 
-       res = make_codec_cmd(codec, nid, direct, verb, parm);
+       cmd = make_codec_cmd(codec, nid, direct, verb, parm);
        snd_hda_power_up(codec);
        mutex_lock(&bus->cmd_mutex);
-       if (!bus->ops.command(bus, res))
+ again:
+       if (!bus->ops.command(bus, cmd)) {
                res = bus->ops.get_response(bus);
-       else
+               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);

diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 2fdecf4..cd8979c 100644 (file)
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -623,6 +623,7 @@ struct hda_bus {
        /* misc op flags */
        unsigned int needs_damn_long_delay :1;
        unsigned int shutdown :1;       /* being unloaded */
+       unsigned int rirb_error:1;      /* error in codec communication */
 };
 
 /*

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 30829ee..803b720 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -604,6 +604,7 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus)
                }
                if (!chip->rirb.cmds) {
                        smp_rmb();
+                       bus->rirb_error = 0;
                        return chip->rirb.res; /* the last value */
                }
                if (time_after(jiffies, timeout))
@@ -623,8 +624,10 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus)
                chip->irq = -1;
                pci_disable_msi(chip->pci);
                chip->msi = 0;
-               if (azx_acquire_irq(chip, 1) < 0)
+               if (azx_acquire_irq(chip, 1) < 0) {
+                       bus->rirb_error = 1;
                        return -1;
+               }
                goto again;
        }
 
@@ -644,14 +647,12 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus)
                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);
-       chip->rirb.rp = azx_readb(chip, RIRBWP);
-       chip->rirb.cmds = 0;
-       /* switch to single_cmd mode */
-       chip->single_cmd = 1;
-       azx_free_cmd_io(chip);
+       snd_printk(KERN_ERR "hda_intel: azx_get_response timeout (ERROR): "
+                  "last cmd=0x%08x\n", chip->last_cmd);
+       spin_lock_irq(&chip->reg_lock);
+       chip->rirb.cmds = 0; /* reset the index */
+       bus->rirb_error = 1;
+       spin_unlock_irq(&chip->reg_lock);
        return -1;
 }