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[media] m88ds3103: calculate DiSEqC message sending time 

DiSEqC message sending takes 13.5 ms per byte, which is 54 ms total
when typical 4 byte message is sent. Don't hard-code time limit to
54 ms, but calculate it. Time limit is only used to determine when to
start poll "DiSEqC Tx ready" status from the chip.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari 2016-06-29 20:39:45 -03:00 committed by Mauro Carvalho Chehab
parent 92519f8f26
commit 9ef3cdc1ef
1 changed files with 3 additions and 2 deletions
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5
drivers/media/dvb-frontends/m88ds3103.c
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@ -1116,8 +1116,9 @@ static int m88ds3103_diseqc_send_master_cmd(struct dvb_frontend *fe,
#define SEND_MASTER_CMD_TIMEOUT 120
timeout = jiffies + msecs_to_jiffies(SEND_MASTER_CMD_TIMEOUT);
/* DiSEqC message typical period is 54 ms */
usleep_range(50000, 54000);
/* DiSEqC message period is 13.5 ms per byte */
utmp = diseqc_cmd->msg_len * 13500;
usleep_range(utmp - 4000, utmp);
for (utmp = 1; !time_after(jiffies, timeout) && utmp;) {
ret = regmap_read(dev->regmap, 0xa1, &utmp);