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authorMaxim Levitsky <maximlevitsky@gmail.com>2010-02-04 22:21:47 +0200
committerTakashi Iwai <tiwai@suse.de>2010-02-05 09:07:21 +0100
commit1eb6dc7dabcb4aa762d96f4f6978f3ef86321d68 (patch)
treec6eee9f271d5b3ea7ca605f38ec7f8656e24e8ee
parent8ce28d6abff34886d3797b25324c940471b99164 (diff)
downloadlinux-2.6.34-ux500-1eb6dc7dabcb4aa762d96f4f6978f3ef86321d68.tar.gz
ALSA: hda - Delay switching to polling mode if an interrupt was missing
My sound codec seems sometimes (very rarely) to omit interrupts (ALC268) However, interrupt mode still works. Thus if we get timeout, poll the codec once. If we get 3 such polls in a row, then switch to polling mode. This patch is maybe an bandaid, but this might be a workaround for hardware bug. Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/hda/hda_intel.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 565de38a3fc..d853e2c33bb 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -426,6 +426,7 @@ struct azx {
/* flags */
int position_fix;
+ int poll_count;
unsigned int running :1;
unsigned int initialized :1;
unsigned int single_cmd :1;
@@ -506,7 +507,7 @@ static char *driver_short_names[] __devinitdata = {
#define get_azx_dev(substream) (substream->runtime->private_data)
static int azx_acquire_irq(struct azx *chip, int do_disconnect);
-
+static int azx_send_cmd(struct hda_bus *bus, unsigned int val);
/*
* Interface for HD codec
*/
@@ -664,11 +665,12 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
{
struct azx *chip = bus->private_data;
unsigned long timeout;
+ int do_poll = 0;
again:
timeout = jiffies + msecs_to_jiffies(1000);
for (;;) {
- if (chip->polling_mode) {
+ if (chip->polling_mode || do_poll) {
spin_lock_irq(&chip->reg_lock);
azx_update_rirb(chip);
spin_unlock_irq(&chip->reg_lock);
@@ -676,6 +678,9 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
if (!chip->rirb.cmds[addr]) {
smp_rmb();
bus->rirb_error = 0;
+
+ if (!do_poll)
+ chip->poll_count = 0;
return chip->rirb.res[addr]; /* the last value */
}
if (time_after(jiffies, timeout))
@@ -688,6 +693,16 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
}
}
+ if (!chip->polling_mode && chip->poll_count < 2) {
+ snd_printdd(SFX "azx_get_response timeout, "
+ "polling the codec once: last cmd=0x%08x\n",
+ chip->last_cmd[addr]);
+ do_poll = 1;
+ chip->poll_count++;
+ goto again;
+ }
+
+
if (!chip->polling_mode) {
snd_printk(KERN_WARNING SFX "azx_get_response timeout, "
"switching to polling mode: last cmd=0x%08x\n",