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authorAntti Palosaari <crope@iki.fi>2016-06-29 20:39:45 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2016-07-08 16:56:18 -0300
commit9ef3cdc1efeb4e98bd579a7f3b182d57c241c0d3 (patch)
tree6e8159b3ae83606c43db39ea8ecdcb7528bdfe6a /drivers/media/dvb-frontends/m88ds3103.c
parent92519f8f26084da60c2bbea6ac70486e64ab9cf8 (diff)
[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/m88ds3103.c')
-rw-r--r--drivers/media/dvb-frontends/m88ds3103.c5
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);

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