--- zzzz-none-000/linux-3.10.107/drivers/media/dvb-frontends/dib0090.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/media/dvb-frontends/dib0090.c	2021-02-04 17:41:59.000000000 +0000
@@ -1696,12 +1696,10 @@
 
 		if (state->identity.p1g)
 			state->dc = dc_p1g_table;
-		*tune_state = CT_TUNER_STEP_0;
 
 		/* fall through */
-
 	case CT_TUNER_STEP_0:
-		dprintk("Sart/continue DC calibration for %s path", (state->dc->i == 1) ? "I" : "Q");
+		dprintk("Start/continue DC calibration for %s path", (state->dc->i == 1) ? "I" : "Q");
 		dib0090_write_reg(state, 0x01, state->dc->bb1);
 		dib0090_write_reg(state, 0x07, state->bb7 | (state->dc->i << 7));
 
@@ -2557,10 +2555,19 @@
 
 	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;