Commit 9ef3cdc1 authored Jun 29, 2016 by Antti Palosaari Committed by Mauro Carvalho Chehab Jul 08, 2016

[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>

parent 92519f8f

drivers/media/dvb-frontends/m88ds3103.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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);