From 9ef3cdc1efeb4e98bd579a7f3b182d57c241c0d3 Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Wed, 29 Jun 2016 20:39:45 -0300 Subject: [PATCH] [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 Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/m88ds3103.c | 5 +++-- 1 file 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); -- 2.34.1