ASoC: Blackfin: document how anomaly 05000250 is handled

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/soc/blackfin/bf5xx-ac97.c b/sound/soc/blackfin/bf5xx-ac97.c
index 8a935f2d1767..b1ed423fabd5 100644
--- a/sound/soc/blackfin/bf5xx-ac97.c
+++ b/sound/soc/blackfin/bf5xx-ac97.c
@@ -31,6 +31,15 @@
 #include "bf5xx-sport.h"
 #include "bf5xx-ac97.h"
 
+/* Anomaly notes:
+ *  05000250 -  AD1980 is running in TDM mode and RFS/TFS are generated by SPORT
+ *              contrtoller. But, RFSDIV and TFSDIV are always set to 16*16-1,
+ *              while the max AC97 data size is 13*16. The DIV is always larger
+ *              than data size. AD73311 and ad2602 are not running in TDM mode.
+ *              AD1836 and AD73322 depend on external RFS/TFS only. So, this
+ *              anomaly does not affect blackfin sound drivers.
+*/
+
 static int *cmd_count;
 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;