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V4L/DVB (5173): Pvrusb2: encoder comm protocol cleanup

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Update the implementation of the communication protocol for operating
the encoder, using updated knowledge about the encoder.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mike Isely 2007-01-28 15:41:12 -03:00 committed by Mauro Carvalho Chehab
parent 567d7115b9
commit c43000ef0c
1 changed files with 94 additions and 60 deletions
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154
drivers/media/video/pvrusb2/pvrusb2-encoder.c
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@ -35,34 +35,41 @@
#define IVTV_MBOX_DRIVER_DONE 0x00000002 #define IVTV_MBOX_DRIVER_DONE 0x00000002
#define IVTV_MBOX_DRIVER_BUSY 0x00000001 #define IVTV_MBOX_DRIVER_BUSY 0x00000001
#define MBOX_BASE 0x44
static int pvr2_encoder_write_words(struct pvr2_hdw *hdw, static int pvr2_encoder_write_words(struct pvr2_hdw *hdw,
unsigned int offs,
const u32 *data, unsigned int dlen) const u32 *data, unsigned int dlen)
{ {
unsigned int idx; unsigned int idx,addr;
unsigned int bAddr;
int ret; int ret;
unsigned int offs = 0;
unsigned int chunkCnt; unsigned int chunkCnt;
/* /*
Format: First byte must be 0x01. Remaining 32 bit words are Format: First byte must be 0x01. Remaining 32 bit words are
spread out into chunks of 7 bytes each, little-endian ordered, spread out into chunks of 7 bytes each, with the first 4 bytes
offset at zero within each 2 blank bytes following and a being the data word (little endian), and the next 3 bytes
single byte that is 0x44 plus the offset of the word. Repeat being the address where that data word is to be written (big
request for additional words, with offset adjusted endian). Repeat request for additional words, with offset
accordingly. adjusted accordingly.
*/ */
while (dlen) { while (dlen) {
chunkCnt = 8; chunkCnt = 8;
if (chunkCnt > dlen) chunkCnt = dlen; if (chunkCnt > dlen) chunkCnt = dlen;
memset(hdw->cmd_buffer,0,sizeof(hdw->cmd_buffer)); memset(hdw->cmd_buffer,0,sizeof(hdw->cmd_buffer));
hdw->cmd_buffer[0] = FX2CMD_MEM_WRITE_DWORD; bAddr = 0;
hdw->cmd_buffer[bAddr++] = FX2CMD_MEM_WRITE_DWORD;
for (idx = 0; idx < chunkCnt; idx++) { for (idx = 0; idx < chunkCnt; idx++) {
hdw->cmd_buffer[1+(idx*7)+6] = 0x44 + idx + offs; addr = idx + offs;
PVR2_DECOMPOSE_LE(hdw->cmd_buffer, 1+(idx*7), hdw->cmd_buffer[bAddr+6] = (addr & 0xffu);
data[idx]); hdw->cmd_buffer[bAddr+5] = ((addr>>8) & 0xffu);
hdw->cmd_buffer[bAddr+4] = ((addr>>16) & 0xffu);
PVR2_DECOMPOSE_LE(hdw->cmd_buffer, bAddr,data[idx]);
bAddr += 7;
} }
ret = pvr2_send_request(hdw, ret = pvr2_send_request(hdw,
hdw->cmd_buffer,1+(chunkCnt*7), hdw->cmd_buffer,1+(chunkCnt*7),
@ -77,34 +84,42 @@ static int pvr2_encoder_write_words(struct pvr2_hdw *hdw,
} }
static int pvr2_encoder_read_words(struct pvr2_hdw *hdw,int statusFl, static int pvr2_encoder_read_words(struct pvr2_hdw *hdw,
unsigned int offs,
u32 *data, unsigned int dlen) u32 *data, unsigned int dlen)
{ {
unsigned int idx; unsigned int idx;
int ret; int ret;
unsigned int offs = 0;
unsigned int chunkCnt; unsigned int chunkCnt;
/* /*
Format: First byte must be 0x02 (status check) or 0x28 (read Format: First byte must be 0x02 (status check) or 0x28 (read
back block of 32 bit words). Next 6 bytes must be zero, back block of 32 bit words). Next 6 bytes must be zero,
followed by a single byte of 0x44+offset for portion to be followed by a single byte of MBOX_BASE+offset for portion to
read. Returned data is packed set of 32 bits words that were be read. Returned data is packed set of 32 bits words that
read. were read.
*/ */
while (dlen) { while (dlen) {
chunkCnt = 16; chunkCnt = 16;
if (chunkCnt > dlen) chunkCnt = dlen; if (chunkCnt > dlen) chunkCnt = dlen;
memset(hdw->cmd_buffer,0,sizeof(hdw->cmd_buffer)); if (chunkCnt < 16) chunkCnt = 1;
hdw->cmd_buffer[0] = hdw->cmd_buffer[0] =
(statusFl ? FX2CMD_MEM_READ_DWORD : FX2CMD_MEM_READ_64BYTES); ((chunkCnt == 1) ?
hdw->cmd_buffer[7] = 0x44 + offs; FX2CMD_MEM_READ_DWORD : FX2CMD_MEM_READ_64BYTES);
hdw->cmd_buffer[1] = 0;
hdw->cmd_buffer[2] = 0;
hdw->cmd_buffer[3] = 0;
hdw->cmd_buffer[4] = 0;
hdw->cmd_buffer[5] = ((offs>>16) & 0xffu);
hdw->cmd_buffer[6] = ((offs>>8) & 0xffu);
hdw->cmd_buffer[7] = (offs & 0xffu);
ret = pvr2_send_request(hdw, ret = pvr2_send_request(hdw,
hdw->cmd_buffer,8, hdw->cmd_buffer,8,
hdw->cmd_buffer,chunkCnt * 4); hdw->cmd_buffer,
(chunkCnt == 1 ? 4 : 16 * 4));
if (ret) return ret; if (ret) return ret;
for (idx = 0; idx < chunkCnt; idx++) { for (idx = 0; idx < chunkCnt; idx++) {
@ -131,6 +146,8 @@ static int pvr2_encoder_cmd(void *ctxt,
u32 *argp) u32 *argp)
{ {
unsigned int poll_count; unsigned int poll_count;
unsigned int try_count = 0;
int retry_flag;
int ret = 0; int ret = 0;
unsigned int idx; unsigned int idx;
/* These sizes look to be limited by the FX2 firmware implementation */ /* These sizes look to be limited by the FX2 firmware implementation */
@ -142,14 +159,15 @@ static int pvr2_encoder_cmd(void *ctxt,
/* /*
The encoder seems to speak entirely using blocks 32 bit words. The encoder seems to speak entirely using blocks 32 bit words.
In ivtv driver terms, this is a mailbox which we populate with In ivtv driver terms, this is a mailbox at MBOX_BASE which we
data and watch what the hardware does with it. The first word populate with data and watch what the hardware does with it.
is a set of flags used to control the transaction, the second The first word is a set of flags used to control the
word is the command to execute, the third byte is zero (ivtv transaction, the second word is the command to execute, the
driver suggests that this is some kind of return value), and third byte is zero (ivtv driver suggests that this is some
the fourth byte is a specified timeout (windows driver always kind of return value), and the fourth byte is a specified
uses 0x00060000 except for one case when it is zero). All timeout (windows driver always uses 0x00060000 except for one
successive words are the argument words for the command. case when it is zero). All successive words are the argument
words for the command.
First, write out the entire set of words, with the first word First, write out the entire set of words, with the first word
being zero. being zero.
@ -158,13 +176,10 @@ static int pvr2_encoder_cmd(void *ctxt,
IVTV_MBOX_DRIVER_DONE | IVTV_DRIVER_BUSY this time (which IVTV_MBOX_DRIVER_DONE | IVTV_DRIVER_BUSY this time (which
probably means "go"). probably means "go").
Next, read back 16 words as status. Check the first word, Next, read back the return count words. Check the first word,
which should have IVTV_MBOX_FIRMWARE_DONE set. If however which should have IVTV_MBOX_FIRMWARE_DONE set. If however
that bit is not set, then the command isn't done so repeat the that bit is not set, then the command isn't done so repeat the
read. read until it is set.
Next, read back 32 words and compare with the original
arugments. Hopefully they will match.
Finally, write out just the first word again, but set it to Finally, write out just the first word again, but set it to
0x0 this time (which probably means "idle"). 0x0 this time (which probably means "idle").
@ -194,6 +209,9 @@ static int pvr2_encoder_cmd(void *ctxt,
LOCK_TAKE(hdw->ctl_lock); do { LOCK_TAKE(hdw->ctl_lock); do {
retry_flag = 0;
try_count++;
ret = 0;
wrData[0] = 0; wrData[0] = 0;
wrData[1] = cmd; wrData[1] = cmd;
wrData[2] = 0; wrData[2] = 0;
@ -205,54 +223,70 @@ static int pvr2_encoder_cmd(void *ctxt,
wrData[idx+4] = 0; wrData[idx+4] = 0;
} }
ret = pvr2_encoder_write_words(hdw,wrData,idx); ret = pvr2_encoder_write_words(hdw,MBOX_BASE,wrData,idx);
if (ret) break; if (ret) break;
wrData[0] = IVTV_MBOX_DRIVER_DONE|IVTV_MBOX_DRIVER_BUSY; wrData[0] = IVTV_MBOX_DRIVER_DONE|IVTV_MBOX_DRIVER_BUSY;
ret = pvr2_encoder_write_words(hdw,wrData,1); ret = pvr2_encoder_write_words(hdw,MBOX_BASE,wrData,1);
if (ret) break; if (ret) break;
poll_count = 0; poll_count = 0;
while (1) { while (1) {
if (poll_count < 10000000) poll_count++; poll_count++;
ret = pvr2_encoder_read_words(hdw,!0,rdData,1); ret = pvr2_encoder_read_words(hdw,MBOX_BASE,rdData,
if (ret) break; arg_cnt_recv+4);
if (ret) {
break;
}
if (rdData[0] & IVTV_MBOX_FIRMWARE_DONE) { if (rdData[0] & IVTV_MBOX_FIRMWARE_DONE) {
break; break;
} }
if (poll_count == 100) { if (rdData[0] && (poll_count < 1000)) continue;
if (!rdData[0]) {
retry_flag = !0;
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder timed out waiting for us"
"; arranging to retry");
} else {
pvr2_trace( pvr2_trace(
PVR2_TRACE_ERROR_LEGS, PVR2_TRACE_ERROR_LEGS,
"***WARNING*** device's encoder" "***WARNING*** device's encoder"
" appears to be stuck" " appears to be stuck"
" (status=0%08x)",rdData[0]); " (status=0%08x)",rdData[0]);
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder command: 0x%02x",cmd);
for (idx = 4; idx < arg_cnt_send; idx++) {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder arg%d: 0x%08x",
idx-3,wrData[idx]);
}
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Giving up waiting."
" It is likely that"
" this is a bad idea...");
ret = -EBUSY;
break;
} }
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder command: 0x%02x",cmd);
for (idx = 4; idx < arg_cnt_send; idx++) {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder arg%d: 0x%08x",
idx-3,wrData[idx]);
}
ret = -EBUSY;
break;
}
if (retry_flag) {
if (try_count < 20) continue;
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Too many retries...");
ret = -EBUSY;
}
if (ret) {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Giving up on command."
" It is likely that"
" this is a bad idea...");
break;
} }
if (ret) break;
wrData[0] = 0x7; wrData[0] = 0x7;
ret = pvr2_encoder_read_words(
hdw,0,rdData, ARRAY_SIZE(rdData));
if (ret) break;
for (idx = 0; idx < arg_cnt_recv; idx++) { for (idx = 0; idx < arg_cnt_recv; idx++) {
argp[idx] = rdData[idx+4]; argp[idx] = rdData[idx+4];
} }
wrData[0] = 0x0; wrData[0] = 0x0;
ret = pvr2_encoder_write_words(hdw,wrData,1); ret = pvr2_encoder_write_words(hdw,MBOX_BASE,wrData,1);
if (ret) break; if (ret) break;
} while(0); LOCK_GIVE(hdw->ctl_lock); } while(0); LOCK_GIVE(hdw->ctl_lock);