[Letux-kernel] mcbsp 4

Andreas Kemnade andreas at kemnade.info
Fri Apr 28 07:30:59 CEST 2017


Hi,

here are some diffs between mcbsp4 between kernel 3.7 and 4.10:

arecord -Dhw:1,0 -fS16_LE -r8000 >/dev//null &


--- mcbsp-record-3.7	2017-04-27 23:43:15.482272917 +0200
+++ mcbsp-record-4.10	2017-04-27 23:43:15.490272917 +0200
@@ -1,4 +1,4 @@
-0x00: 0x00010222
+0x00: 0xff693a7a
 0x04: 0x00000000
 0x08: 0x00000000
 0x0c: 0x00000000
@@ -16,7 +16,7 @@
 0x3c: 0x00000000
 0x40: 0x00000000
 0x44: 0x00000000
-0x48: 0x00000000
+0x48: 0x0000000f
 0x4c: 0x00000000
 0x50: 0x00000000
 0x54: 0x00000000
@@ -38,8 +38,8 @@
 0x94: 0x00000000
 0x98: 0x00000000
 0x9c: 0x00000000
-0xa0: 0x00000010
-0xa4: 0x00000081
+0xa0: 0x00000000
+0xa4: 0x000018b1
 0xa8: 0x00000408
 0xac: 0x00001009
 0xb0: 0x00000808


 aplay -Dhw:1,0 -fS16_LE -r8000 /dev/zero  &

--- mcbsp-play-3.7	2017-04-27 23:43:15.474272916 +0200
+++ mcbsp-play-4.10	2017-04-27 23:43:15.478272917 +0200
@@ -1,4 +1,4 @@
-0x00: 0x00010222
+0x00: 0xff693a7a
 0x04: 0x00000000
 0x08: 0x00000000
 0x0c: 0x00000000
@@ -16,7 +16,7 @@
 0x3c: 0x00000000
 0x40: 0x00000000
 0x44: 0x00000000
-0x48: 0x00000000
+0x48: 0x0000000f
 0x4c: 0x00000000
 0x50: 0x00000000
 0x54: 0x00000000
@@ -38,8 +38,8 @@
 0x94: 0x00000000
 0x98: 0x00000000
 0x9c: 0x00000000
-0xa0: 0x00000410
-0xa4: 0x00000081
+0xa0: 0x00000000
+0xa4: 0x000018b1
 0xa8: 0x00000408
 0xac: 0x00001008
 0xb0: 0x00000809


Maybe that is an interesting starting point why mcbsp4.10 produces
strange noises in 4.10.

Regards,
Andreas
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