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Commit 0de04ca1 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[media] dib0090: Fix the sleep time at the state machine 



msleep() is not too precise: its precision depends on the
HZ config. As the driver selects precise timings for the
state machine, change it to usleep_range().

Acked-By: default avatarPatrick Boettcher <pboettcher@kernellabs.com>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 4607bb7a

drivers/media/dvb-frontends/dib0090.c

+12 −3
Original line number Diff line number Diff line
@@ -2557,10 +2557,19 @@ static int dib0090_set_params(struct dvb_frontend *fe) 


	do {

		ret = dib0090_tune(fe);

		if (ret != FE_CALLBACK_TIME_NEVER)

			msleep(ret / 10);

		else

		if (ret == FE_CALLBACK_TIME_NEVER)

			break;



		/*

		 * Despite dib0090_tune returns time at a 0.1 ms range,

		 * the actual sleep time depends on CONFIG_HZ. The worse case

		 * is when CONFIG_HZ=100. In such case, the minimum granularity

		 * is 10ms. On some real field tests, the tuner sometimes don't

		 * lock when this timer is lower than 10ms. So, enforce a 10ms

		 * granularity and use usleep_range() instead of msleep().

		 */

		ret = 10 * (ret + 99)/100;

		usleep_range(ret * 1000, (ret + 1) * 1000);

	} while (state->tune_state != CT_TUNER_STOP);



	return 0;