Add an overflow check of CORB in HD-audio controller and codec drivers
so that flood of sequential writes would work properly.
In the controller side, add a check of CORB read-pointer to make
returning -EAGAIN when it's full. Meanwhile in the codec side, when
-EAGAIN error is received, it retries the write after flushing the
pending verbs (calling get_response() essentially does it).
Signed-off-by: Takashi Iwai <tiwai@suse.de>
again:
snd_hda_power_up(codec);
mutex_lock(&bus->cmd_mutex);
- trace_hda_send_cmd(codec, cmd);
- err = bus->ops.command(bus, cmd);
+ for (;;) {
+ trace_hda_send_cmd(codec, cmd);
+ err = bus->ops.command(bus, cmd);
+ if (err != -EAGAIN)
+ break;
+ /* process pending verbs */
+ bus->ops.get_response(bus, codec->addr);
+ }
if (!err && res) {
*res = bus->ops.get_response(bus, codec->addr);
trace_hda_get_response(codec, *res);
{
struct azx *chip = bus->private_data;
unsigned int addr = azx_command_addr(val);
- unsigned int wp;
+ unsigned int wp, rp;
spin_lock_irq(&chip->reg_lock);
if (wp == 0xffff) {
/* something wrong, controller likely turned to D3 */
spin_unlock_irq(&chip->reg_lock);
- return -1;
+ return -EIO;
}
wp++;
wp %= ICH6_MAX_CORB_ENTRIES;
+ rp = azx_readw(chip, CORBRP);
+ if (wp == rp) {
+ /* oops, it's full */
+ spin_unlock_irq(&chip->reg_lock);
+ return -EAGAIN;
+ }
+
chip->rirb.cmds[addr]++;
chip->corb.buf[wp] = cpu_to_le32(val);
azx_writel(chip, CORBWP, wp);