redonkable/alistair23-linux
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V4L/DVB (10278): cx18: Fix bad audio in first analog capture.

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Normalize the APU state before the second firmware load so that audio
for the first analog capture is correct.

Many thanks to Conexant for supporting me in finding a solution for this
problem.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andy Walls 2009-01-04 21:51:17 -03:00 committed by Mauro Carvalho Chehab
parent 31230c5f6f
commit 350145a4f7
3 changed files with 33 additions and 2 deletions
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17
drivers/media/video/cx18/cx18-driver.c
View file

@ -1043,8 +1043,21 @@ int cx18_init_on_first_open(struct cx18 *cx)
}
set_bit(CX18_F_I_LOADED_FW, &cx->i_flags);
/* Init the firmware twice to work around a silicon bug
* transport related. */
/*
* Init the firmware twice to work around a silicon bug
* with the digital TS.
*
* The second firmware load requires us to normalize the APU state,
* or the audio for the first analog capture will be badly incorrect.
*
* I can't seem to call APU_RESETAI and have it succeed without the
* APU capturing audio, so we start and stop it here to do the reset
*/
/* MPEG Encoding, 224 kbps, MPEG Layer II, 48 ksps */
cx18_vapi(cx, CX18_APU_START, 2, CX18_APU_ENCODING_METHOD_MPEG|0xb9, 0);
cx18_vapi(cx, CX18_APU_RESETAI, 0);
cx18_vapi(cx, CX18_APU_STOP, 1, CX18_APU_ENCODING_METHOD_MPEG);
fw_retry_count = 3;
while (--fw_retry_count > 0) {

2
drivers/media/video/cx18/cx18-mailbox.c
View file

@ -83,6 +83,8 @@ static const struct cx18_api_info api_info[] = {
API_ENTRY(CPU, CX18_CPU_DE_SET_MDL_ACK, 0),
API_ENTRY(CPU, CX18_CPU_DE_SET_MDL, API_FAST),
API_ENTRY(CPU, CX18_CPU_DE_RELEASE_MDL, API_SLOW),
API_ENTRY(APU, CX18_APU_START, 0),
API_ENTRY(APU, CX18_APU_STOP, 0),
API_ENTRY(APU, CX18_APU_RESETAI, 0),
API_ENTRY(CPU, CX18_CPU_DEBUG_PEEK32, 0),
API_ENTRY(0, 0, 0),

16
drivers/media/video/cx18/cx23418.h
View file

@ -56,6 +56,22 @@
#define APU_CMD_MASK 0x10000000
#define APU_CMD_MASK_ACK (APU_CMD_MASK | 0x80000000)
#define CX18_APU_ENCODING_METHOD_MPEG (0 << 28)
#define CX18_APU_ENCODING_METHOD_AC3 (1 << 28)
/* Description: Command APU to start audio
IN[0] - audio parameters (same as CX18_CPU_SET_AUDIO_PARAMETERS?)
IN[1] - caller buffer address, or 0
ReturnCode - ??? */
#define CX18_APU_START (APU_CMD_MASK | 0x01)
/* Description: Command APU to stop audio
IN[0] - encoding method to stop
ReturnCode - ??? */
#define CX18_APU_STOP (APU_CMD_MASK | 0x02)
/* Description: Command APU to reset the AI
ReturnCode - ??? */
#define CX18_APU_RESETAI (APU_CMD_MASK | 0x05)
/* Description: This command indicates that a Memory Descriptor List has been