From: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Date: Wed, 23 Feb 2011 10:43:09 +0000 (+0100)
Subject: ALSA: hdspm - Fix buffer handling on RME MADI/MADIface/AES(32)
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=483cee77d2be6c22ef67ac8c6711e757d138a538;p=openwrt%2Fstaging%2Fblogic.git

ALSA: hdspm - Fix buffer handling on RME MADI/MADIface/AES(32)

Only RayDAT and AIO provide sane buffer pointers that can be used with
HDSPM_BufferPositionMask, on all other cards, this would result in a
wrong HW pointer leading to xruns and these messages:

[260808.916788] BUG: pcmC0D0p:0, pos = 2976, buffer size = 1024, period size = 512
[260808.961124] BUG: pcmC0D0c:0, pos = 4944, buffer size = 1024, period size = 512

Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 92588975f580..509a35a881f5 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -1231,8 +1231,17 @@ static snd_pcm_uframes_t hdspm_hw_pointer(struct hdspm *hdspm)
 	int position;
 
 	position = hdspm_read(hdspm, HDSPM_statusRegister);
-	position &= HDSPM_BufferPositionMask;
-	position /= 4; /* Bytes per sample */
+
+	switch (hdspm->io_type) {
+	case RayDAT:
+	case AIO:
+		position &= HDSPM_BufferPositionMask;
+		position /= 4; /* Bytes per sample */
+		break;
+	default:
+		position = (position & HDSPM_BufferID) ?
+			(hdspm->period_bytes / 4) : 0;
+	}
 
 	return position;
 }