[alsa-devel] Bug in sound-unstable-2.6 ice1724
Takashi Iwai
tiwai at suse.de
Wed Nov 5 15:48:10 CET 2008
At Wed, 5 Nov 2008 15:45:43 +0100,
=?UTF-8?Q?Vedran_Mileti=C4=87?= wrote:
>
> How can I test if MIDI TX is broken?
Just run aplaymidi to the hardware port.
It doesn't matter whether you connected to any device or not.
Check the count in /proc/asound/card0/midi* proc file changes,
and most importantly, the machine doesn't hang up.
thanks,
Takashi
> 2008/11/3 Takashi Iwai <tiwai at suse.de>:
> > At Sun, 02 Nov 2008 19:21:37 +0100,
> > I wrote:
> >>
> >> At Sun, 2 Nov 2008 15:21:05 +0200,
> >> Karsten Wiese wrote:
> >> >
> >> > Am Sonntag, 2. November 2008 schrieb Takashi Iwai:
> >> > > nAt Sat, 1 Nov 2008 19:08:59 +0200,
> >> > > Karsten Wiese wrote:
> >> > > >
> >> > > > Hi Takashi,
> >> > > >
> >> > > > Am Sonntag, 26. Oktober 2008 schrieb Takashi Iwai:
> >> > > > > At Sun, 26 Oct 2008 17:31:02 +0100,
> >> > > > > =?UTF-8?Q?Vedran_Mileti=C4=87?= wrote:
> >> > > > > >
> >> > > > > > Yeap, that one does it. No need to revert it fully, though. I just
> >> > > > > > uncommented the unsigned char mask line and removed that #if 0 and
> >> > > > > > #endif. Now it works perfectly. Thanks! Can you fix it in your tree?
> >> > > > >
> >> > > > > Well, before doing that, I'd like to understand the problem more.
> >> > > > >
> >> > > > > If the problem is about the initial IRQ mask value, setting 0 should
> >> > > > > work as well.
> >> > > > > Could you change the code just to do like below, and check whether it
> >> > > > > works?
> >> > > > > outb(0, ICEREG1724(ice, IRQMASK));
> >> > > >
> >> > > > Makes a pc hang sometimes here, while reverting the entire patch is stable.
> >> > > > no midi tested though, only audio.
> >> > >
> >> > > Hmm, that's a bad news.
> >> > > Basically my change is just to disable MPU_TX irq when unresolved irqs
> >> > > occur. The detection was already there, but it was enabled only when
> >> > > CONFIG_SND_DEBUG.
> >> > >
> >> > > So, the question is, whether does the hang-up happens even with the
> >> > > old code when you enable CONFIG_SND_DEBUG?
> >> > >
> >> > > Also, a bit more detail would be appreciated -- what kind of hang-up,
> >> > > whether you get the error message, or so.
> >> >
> >> > the hang happened on an always on production machine. I don't have a second
> >> > card to test with currently, nor do i like to test on that machine again ;-)
> >> >
> >> > May be its just that the mask has to be applied the other way round:
> >> > I'd guess a 1 means "masked" or "not active".
> >>
> >> Damn, you must be right!
> >> Could you give the patch below?
> >
> > ... and looking through the code again, I think (hopefully) the patch
> > below will fix the MIDI TX problem, too.
> >
> > Could someone give it a try? It includes the previous patch.
> >
> >
> > thanks,
> >
> > Takashi
> >
> > ---
> > diff --git a/sound/pci/ice1712/ice1724.c b/sound/pci/ice1712/ice1724.c
> > index 40725df..fd7b440 100644
> > --- a/sound/pci/ice1712/ice1724.c
> > +++ b/sound/pci/ice1712/ice1724.c
> > @@ -241,6 +241,9 @@ get_rawmidi_substream(struct snd_ice1712 *ice, unsigned int stream)
> > struct snd_rawmidi_substream, list);
> > }
> >
> > +static void enable_midi_irq_unlocked(struct snd_ice1712 *ice,
> > + u8 flag, int enable);
> > +
> > static void vt1724_midi_write(struct snd_ice1712 *ice)
> > {
> > struct snd_rawmidi_substream *s;
> > @@ -254,6 +257,11 @@ static void vt1724_midi_write(struct snd_ice1712 *ice)
> > for (i = 0; i < count; ++i)
> > outb(buffer[i], ICEREG1724(ice, MPU_DATA));
> > }
> > + /* mask irq when all bytes have been transmitted.
> > + * enabled again in output_trigger when the new data comes in.
> > + */
> > + if (snd_rawmidi_transmit_empty(s))
> > + enable_midi_irq_unlocked(ice, VT1724_IRQ_MPU_TX, 0);
> > }
> >
> > static void vt1724_midi_read(struct snd_ice1712 *ice)
> > @@ -272,31 +280,34 @@ static void vt1724_midi_read(struct snd_ice1712 *ice)
> > }
> > }
> >
> > -static void vt1724_enable_midi_irq(struct snd_rawmidi_substream *substream,
> > - u8 flag, int enable)
> > +static void enable_midi_irq_unlocked(struct snd_ice1712 *ice,
> > + u8 flag, int enable)
> > {
> > - struct snd_ice1712 *ice = substream->rmidi->private_data;
> > - u8 mask;
> > -
> > - spin_lock_irq(&ice->reg_lock);
> > - mask = inb(ICEREG1724(ice, IRQMASK));
> > + u8 mask = inb(ICEREG1724(ice, IRQMASK));
> > if (enable)
> > mask &= ~flag;
> > else
> > mask |= flag;
> > outb(mask, ICEREG1724(ice, IRQMASK));
> > +}
> > +
> > +static void vt1724_enable_midi_irq(struct snd_rawmidi_substream *substream,
> > + u8 flag, int enable)
> > +{
> > + struct snd_ice1712 *ice = substream->rmidi->private_data;
> > +
> > + spin_lock_irq(&ice->reg_lock);
> > + enable_midi_irq_unlocked(ice, flag, enable);
> > spin_unlock_irq(&ice->reg_lock);
> > }
> >
> > static int vt1724_midi_output_open(struct snd_rawmidi_substream *s)
> > {
> > - vt1724_enable_midi_irq(s, VT1724_IRQ_MPU_TX, 1);
> > return 0;
> > }
> >
> > static int vt1724_midi_output_close(struct snd_rawmidi_substream *s)
> > {
> > - vt1724_enable_midi_irq(s, VT1724_IRQ_MPU_TX, 0);
> > return 0;
> > }
> >
> > @@ -306,6 +317,7 @@ static void vt1724_midi_output_trigger(struct snd_rawmidi_substream *s, int up)
> > unsigned long flags;
> >
> > spin_lock_irqsave(&ice->reg_lock, flags);
> > + enable_midi_irq_unlocked(ice, VT1724_IRQ_MPU_TX, up);
> > if (up) {
> > ice->midi_output = 1;
> > vt1724_midi_write(ice);
> > @@ -320,6 +332,7 @@ static void vt1724_midi_output_drain(struct snd_rawmidi_substream *s)
> > struct snd_ice1712 *ice = s->rmidi->private_data;
> > unsigned long timeout;
> >
> > + vt1724_enable_midi_irq(s, VT1724_IRQ_MPU_TX, 0);
> > /* 32 bytes should be transmitted in less than about 12 ms */
> > timeout = jiffies + msecs_to_jiffies(15);
> > do {
> > @@ -389,41 +402,41 @@ static irqreturn_t snd_vt1724_interrupt(int irq, void *dev_id)
> > status &= status_mask;
> > if (status == 0)
> > break;
> > + spin_lock(&ice->reg_lock);
> > if (++timeout > 10) {
> > status = inb(ICEREG1724(ice, IRQSTAT));
> > printk(KERN_ERR "ice1724: Too long irq loop, "
> > "status = 0x%x\n", status);
> > if (status & VT1724_IRQ_MPU_TX) {
> > printk(KERN_ERR "ice1724: Disabling MPU_TX\n");
> > - outb(inb(ICEREG1724(ice, IRQMASK)) &
> > - ~VT1724_IRQ_MPU_TX,
> > - ICEREG1724(ice, IRQMASK));
> > + enable_midi_irq_unlocked(ice,
> > + VT1724_IRQ_MPU_TX, 0);
> > }
> > + spin_unlock(&ice->reg_lock);
> > break;
> > }
> > handled = 1;
> > if (status & VT1724_IRQ_MPU_TX) {
> > - spin_lock(&ice->reg_lock);
> > if (ice->midi_output)
> > vt1724_midi_write(ice);
> > - spin_unlock(&ice->reg_lock);
> > +#if 0 /* should have been fixed */
> > /* Due to mysterical reasons, MPU_TX is always
> > * generated (and can't be cleared) when a PCM
> > * playback is going. So let's ignore at the
> > * next loop.
> > */
> > status_mask &= ~VT1724_IRQ_MPU_TX;
> > +#endif
> > }
> > if (status & VT1724_IRQ_MPU_RX) {
> > - spin_lock(&ice->reg_lock);
> > if (ice->midi_input)
> > vt1724_midi_read(ice);
> > else
> > vt1724_midi_clear_rx(ice);
> > - spin_unlock(&ice->reg_lock);
> > }
> > /* ack MPU irq */
> > outb(status, ICEREG1724(ice, IRQSTAT));
> > + spin_unlock(&ice->reg_lock);
> > if (status & VT1724_IRQ_MTPCM) {
> > /*
> > * Multi-track PCM
> > @@ -2413,8 +2426,8 @@ static int __devinit snd_vt1724_create(struct snd_card *card,
> > return -EIO;
> > }
> >
> > - /* clear interrupts -- otherwise you'll get irq problems later */
> > - outb(0, ICEREG1724(ice, IRQMASK));
> > + /* MPU_RX and TX irq masks are cleared later dynamically */
> > + outb(VT1724_IRQ_MPU_RX | VT1724_IRQ_MPU_TX , ICEREG1724(ice, IRQMASK));
> >
> > /* don't handle FIFO overrun/underruns (just yet),
> > * since they cause machine lockups
> >
>
>
>
> --
> Vedran Miletić
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