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| author | Antti Palosaari <crope@iki.fi> | 2016-06-30 02:39:45 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 22:56:18 +0300 |
| commit | 9ef3cdc1efeb4e98bd579a7f3b182d57c241c0d3 (patch) | |
| tree | 6e8159b3ae83606c43db39ea8ecdcb7528bdfe6a /drivers/media/dvb-frontends | |
| parent | 92519f8f26084da60c2bbea6ac70486e64ab9cf8 (diff) | |
| download | linux-9ef3cdc1efeb4e98bd579a7f3b182d57c241c0d3.tar.xz | |
[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>
Diffstat (limited to 'drivers/media/dvb-frontends')
| -rw-r--r-- | drivers/media/dvb-frontends/m88ds3103.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 7c19601a2483..6f03ca8b25da 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -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); |