Re: [Alsa-devel] Burgundy Auto-Mute problem

[Takashi Iwai <tiwai@suse.de>]

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At Thu, 17 Jul 2003 11:08:03 +0200,
Ernst Persson wrote:
>
> Hi all!
>
> Now that the 2.6.0 kernel is out I'm trying to get ALSA working on my iMac
> 266, since it's the default sound system now (and dmasound doesn't compile).
>
> The first problem was that everything locked up when the ALSA drivers loaded.
> No error message, no kernel panic, just dead. And compiling ALSA with debug
> didn't help either.
>
> After some debugging I found out that the driver crashed here, in
> sound/ppc/burgundy.c    in   int __init snd_pmac_burgundy_init(pmac_t *chip)
>
> #ifdef PMAC_SUPPORT_AUTOMUTE
>
> 	printk(KERN_INFO "Automute Enabled.\n");
>
> 	if ((err = snd_pmac_add_automute(chip)) < 0)
> 		return err;
>
> 	chip->detect_headphone = snd_pmac_burgundy_detect_headphone;
> 	chip->update_automute = snd_pmac_burgundy_update_automute;
> 	snd_pmac_burgundy_update_automute(chip, 0); /* update the status only */
> #endif
> So I commented out //#define PMAC_SUPPORT_AUTOMUTE in pmac.h and after that
> the driver loaded without problems.
>
> But as soon as I touch any mixer (both the oss-emulated or with alsamixer)
> everything locks up again, in exactly the same way.

it seems that extend extend_wait() function waits for an infinite
loop.  could you try the attached patch?


Takashi

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Index: alsa-kernel/ppc/burgundy.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/ppc/burgundy.c,v
retrieving revision 1.9
diff -u -r1.9 burgundy.c
--- alsa-kernel/ppc/burgundy.c	16 Aug 2002 15:05:05 -0000	1.9
+++ alsa-kernel/ppc/burgundy.c	17 Jul 2003 10:11:07 -0000
@@ -34,17 +34,27 @@
 inline static void
 snd_pmac_burgundy_busy_wait(pmac_t *chip)
 {
-	while (in_le32(&chip->awacs->codec_ctrl) & MASK_NEWECMD)
-		;
+	int timeout = 50;
+	while ((in_le32(&chip->awacs->codec_ctrl) & MASK_NEWECMD) && timeout--)
+		udelay(1);
+	if (! timeout)
+		printk(KERN_DEBUG "burgundy_busy_wait: timeout\n");
 }

 inline static void
 snd_pmac_burgundy_extend_wait(pmac_t *chip)
 {
-	while (!(in_le32(&chip->awacs->codec_stat) & MASK_EXTEND))
-		;
-	while (in_le32(&chip->awacs->codec_stat) & MASK_EXTEND)
-		;
+	int timeout;
+	timeout = 50;
+	while (!(in_le32(&chip->awacs->codec_stat) & MASK_EXTEND) && timeout--)
+		udelay(1);
+	if (! timeout)
+		printk(KERN_DEBUG "burgundy_extend_wait: timeout #1\n");
+	timeout = 50;
+	while ((in_le32(&chip->awacs->codec_stat) & MASK_EXTEND) && timeout--)
+		udelay(1);
+	if (! timeout)
+		printk(KERN_DEBUG "burgundy_extend_wait: timeout #2\n");
 }

 static void
@@ -66,7 +76,6 @@
 	unsigned val = 0;
 	unsigned long flags;

-	/* should have timeouts here */
 	spin_lock_irqsave(&chip->reg_lock, flags);

 	out_le32(&chip->awacs->codec_ctrl, addr + 0x100000);
@@ -107,7 +116,6 @@
 	unsigned val = 0;
 	unsigned long flags;

-	/* should have timeouts here */
 	spin_lock_irqsave(&chip->reg_lock, flags);

 	out_le32(&chip->awacs->codec_ctrl, addr + 0x100000);