azalia(4): RIRB DMA engine needs delay after started

[SASANO Takayoshi]

Hello,

I am trying OpenBSD-current/i386 on 86duino EduCake.
It uses DM&P Vortex86EX SoC and its azalia fails to find ALC262 codec.

The diagnostic message says "RIRB is not running"
(at azalia_get_response()), and I found Vortex86EX's azalia takes 2~4
DELAY(1)s to start RIRB DMA engine.

(Vortex86EX's CORB DMA did not required any delay. It starts immediately.)

Here is the patch to add delay.

Regards,
--
SASANO Takayoshi <u...@mx5.nisiq.net>

Index: azalia.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/azalia.c,v
retrieving revision 1.209
diff -u -p -r1.209 azalia.c
--- azalia.c    30 Dec 2013 10:53:30 -0000      1.209
+++ azalia.c    24 Feb 2014 20:45:37 -0000
@@ -1110,7 +1110,7 @@ azalia_halt_rirb(azalia_t *az)
 int
 azalia_init_rirb(azalia_t *az, int resuming)
 {
-       int err;
+       int err, i;
        uint16_t rirbwp;
        uint8_t rirbctl;
 
@@ -1161,6 +1161,14 @@ azalia_init_rirb(azalia_t *az, int resum
        rirbctl = AZ_READ_1(az, RIRBCTL);
        AZ_WRITE_1(az, RIRBCTL, rirbctl |
            HDA_RIRBCTL_RIRBDMAEN | HDA_RIRBCTL_RINTCTL);
+
+       /* wait for RIRB DMA engine is running */
+       for (i = 1000; i >= 0; i--) {
+               if (AZ_READ_1(az, RIRBCTL) & HDA_RIRBCTL_RIRBDMAEN)
+                       break;
+               DELAY(1);
+       }
+       DPRINTF(("%s: wait counter = %d\n", __func__, i));
 
        return (0);
 }