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[6/7] ALSA: firewire-lib: code refactoring for jumbo payload quirk

Message ID 20210514085435.92807-7-o-takashi@sakamocchi.jp
State Superseded
Headers show
Series ALSA: oxfw: code refactoring for quirks specific to ASICs | expand

Commit Message

Takashi Sakamoto May 14, 2021, 8:54 a.m. UTC 
A new macro is added to describe the maximum number of cycles to accept
cycle skip by jumbo payload quirk.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/amdtp-stream.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index e0faa6601966..d78f86e12e76 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -64,6 +64,11 @@ 
 #define IT_PKT_HEADER_SIZE_CIP		8 // For 2 CIP header.
 #define IT_PKT_HEADER_SIZE_NO_CIP	0 // Nothing.
 
+// The initial firmware of OXFW970 can postpone transmission of packet during finishing
+// asynchronous transaction. This module accepts 5 cycles to skip as maximum to avoid buffer
+// overrun. Actual device can skip more, then this module stops the packet streaming.
+#define IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES	5
+
 static void pcm_period_work(struct work_struct *work);
 
 /**
@@ -316,7 +321,7 @@  unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s)
 	unsigned int cip_header_size = 0;
 
 	if (s->flags & CIP_JUMBO_PAYLOAD)
-		multiplier = 5;
+		multiplier = IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES;
 	if (!(s->flags & CIP_NO_HEADER))
 		cip_header_size = sizeof(__be32) * 2;