[ALSA] hda-intel - Add single_cmd option for debugging

Modules: Documentation,HDA Intel driver

Added single_cmd module option for debugging in the case CORB/RIRB
doesn't work well (e.g. due to wrong irq routings).
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -671,6 +671,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
     model	- force the model name
     position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size)
+    single_cmd  - Use single immediate commands to communicate with
+		codecs (for debugging only)
 
     This module supports one card and autoprobe.
 
@@ -723,6 +725,17 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 	    (Usually SD_LPLIB register is more accurate than the
 	    position buffer.)
 
+    NB: If you get many "azx_get_response timeout" messages at
+    loading, it's likely a problem of interrupts (e.g. ACPI irq
+    routing).  Try to boot with options like "pci=noacpi".  Also, you
+    can try "single_cmd=1" module option.  This will switch the
+    communication method between HDA controller and codecs to the
+    single immediate commands instead of CORB/RIRB.  Basically, the
+    single command mode is provided only for BIOS, and you won't get
+    unsolicited events, too.  But, at least, this works independently
+    from the irq.  Remember this is a last resort, and should be
+    avoided as much as possible...
+    
     The power-management is supported.
 
   Module snd-hdsp

sound/pci/hda/hda_intel.c

@@ -53,6 +53,7 @@ static char *id = SNDRV_DEFAULT_STR1;
 static char *model;
 static int position_fix;
 static int probe_mask = -1;
+static int single_cmd;
 
 module_param(index, int, 0444);
 MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
@@ -64,6 +65,8 @@ module_param(position_fix, int, 0444);
 MODULE_PARM_DESC(position_fix, "Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size).");
 module_param(probe_mask, int, 0444);
 MODULE_PARM_DESC(probe_mask, "Bitmask to probe codecs (default = -1).");
+module_param(single_cmd, bool, 0444);
+MODULE_PARM_DESC(single_cmd, "Use single command to communicate with codecs (for debugging only).");
 
 
 /* just for backward compatibility */
@@ -234,12 +237,6 @@ enum {
 #define NVIDIA_HDA_TRANSREG_ADDR      0x4e
 #define NVIDIA_HDA_ENABLE_COHBITS     0x0f
 
-/*
- * Use CORB/RIRB for communication from/to codecs.
- * This is the way recommended by Intel (see below).
- */
-#define USE_CORB_RIRB
-
 /*
  */
 
@@ -325,6 +322,7 @@ struct azx {
 	/* flags */
 	int position_fix;
 	unsigned int initialized: 1;
+	unsigned int single_cmd: 1;
 };
 
 /* driver types */
@@ -388,7 +386,6 @@ static char *driver_short_names[] __devinitdata = {
  * Interface for HD codec
  */
 
-#ifdef USE_CORB_RIRB
 /*
  * CORB / RIRB interface
  */
@@ -436,11 +433,7 @@ static void azx_init_cmd_io(struct azx *chip)
 	/* set N=1, get RIRB response interrupt for new entry */
 	azx_writew(chip, RINTCNT, 1);
 	/* enable rirb dma and response irq */
-#ifdef USE_CORB_RIRB
 	azx_writeb(chip, RIRBCTL, ICH6_RBCTL_DMA_EN | ICH6_RBCTL_IRQ_EN);
-#else
-	azx_writeb(chip, RIRBCTL, ICH6_RBCTL_DMA_EN);
-#endif
 	chip->rirb.rp = chip->rirb.cmds = 0;
 }
 
@@ -528,7 +521,6 @@ static unsigned int azx_get_response(struct hda_codec *codec)
 	return chip->rirb.res; /* the last value */
 }
 
-#else
 /*
  * Use the single immediate command instead of CORB/RIRB for simplicity
  *
@@ -539,13 +531,10 @@ static unsigned int azx_get_response(struct hda_codec *codec)
  *       I left the codes, however, for debugging/testing purposes.
  */
 
-#define azx_alloc_cmd_io(chip)	0
-#define azx_init_cmd_io(chip)
-#define azx_free_cmd_io(chip)
-
 /* send a command */
-static int azx_send_cmd(struct hda_codec *codec, hda_nid_t nid, int direct,
-			unsigned int verb, unsigned int para)
+static int azx_single_send_cmd(struct hda_codec *codec, hda_nid_t nid,
+			       int direct, unsigned int verb,
+			       unsigned int para)
 {
 	struct azx *chip = codec->bus->private_data;
 	u32 val;
@@ -573,7 +562,7 @@ static int azx_send_cmd(struct hda_codec *codec, hda_nid_t nid, int direct,
 }
 
 /* receive a response */
-static unsigned int azx_get_response(struct hda_codec *codec)
+static unsigned int azx_single_get_response(struct hda_codec *codec)
 {
 	struct azx *chip = codec->bus->private_data;
 	int timeout = 50;
@@ -588,10 +577,6 @@ static unsigned int azx_get_response(struct hda_codec *codec)
 	return (unsigned int)-1;
 }
 
-#define azx_update_rirb(chip)
-
-#endif /* USE_CORB_RIRB */
-
 /* reset codec link */
 static int azx_reset(struct azx *chip)
 {
@@ -737,6 +722,7 @@ static void azx_init_chip(struct azx *chip)
 	azx_int_enable(chip);
 
 	/* initialize the codec command I/O */
+	if (! chip->single_cmd)
 		azx_init_cmd_io(chip);
 
 	/* program the position buffer */
@@ -796,7 +782,7 @@ static irqreturn_t azx_interrupt(int irq, void* dev_id, struct pt_regs *regs)
 	/* clear rirb int */
 	status = azx_readb(chip, RIRBSTS);
 	if (status & RIRB_INT_MASK) {
-		if (status & RIRB_INT_RESPONSE)
+		if (! chip->single_cmd && (status & RIRB_INT_RESPONSE))
 			azx_update_rirb(chip);
 		azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);
 	}
@@ -913,8 +899,13 @@ static int __devinit azx_codec_create(struct azx *chip, const char *model)
 	bus_temp.private_data = chip;
 	bus_temp.modelname = model;
 	bus_temp.pci = chip->pci;
+	if (chip->single_cmd) {
+		bus_temp.ops.command = azx_single_send_cmd;
+		bus_temp.ops.get_response = azx_single_get_response;
+	} else {
 		bus_temp.ops.command = azx_send_cmd;
 		bus_temp.ops.get_response = azx_get_response;
+	}
 
 	if ((err = snd_hda_bus_new(chip->card, &bus_temp, &chip->bus)) < 0)
 		return err;
@@ -1316,6 +1307,7 @@ static int azx_suspend(struct pci_dev *pci, pm_message_t state)
 	for (i = 0; i < chip->pcm_devs; i++)
 		snd_pcm_suspend_all(chip->pcm[i]);
 	snd_hda_suspend(chip->bus, state);
+	if (! chip->single_cmd)
 		azx_free_cmd_io(chip);
 	pci_disable_device(pci);
 	pci_save_state(pci);
@@ -1354,6 +1346,7 @@ static int azx_free(struct azx *chip)
 		azx_int_clear(chip);
 
 		/* disable CORB/RIRB */
+		if (! chip->single_cmd)
 			azx_free_cmd_io(chip);
 
 		/* disable position buffer */
@@ -1422,6 +1415,7 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
 	chip->driver_type = driver_type;
 
 	chip->position_fix = position_fix ? position_fix : POS_FIX_POSBUF;
+	chip->single_cmd = single_cmd;
 
 #if BITS_PER_LONG != 64
 	/* Fix up base address on ULI M5461 */
@@ -1492,6 +1486,7 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
 		goto errout;
 	}
 	/* allocate CORB/RIRB */
+	if (! chip->single_cmd)
 		if ((err = azx_alloc_cmd_io(chip)) < 0)
 			goto errout;