V4L/DVB (7572): mt312: Fix diseqc

Correct the frequency of the emitted diseqc signal to 22kHz.
Adds sleep(100) to wait for message to be transmitted.

For now the only user of mt312 is b2c2-flexcop, and it
does overwrite all diseqc related functions with own code.
Signed-off-by: NMatthias Schwarzott <zzam@gentoo.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/mt312.c

@@ -270,7 +270,7 @@ static int mt312_initfe(struct dvb_frontend *fe)
 				MT312_SYS_CLK) * 2, 1000000);
 
 	/* DISEQC_RATIO */
-	buf[1] = mt312_div(MT312_PLL_CLK, 15000 * 4);
+	buf[1] = mt312_div(MT312_PLL_CLK, 22000 * 4);
 
 	ret = mt312_write(state, SYS_CLK, buf, sizeof(buf));
 	if (ret < 0)
@@ -323,6 +323,9 @@ static int mt312_send_master_cmd(struct dvb_frontend *fe,
 	if (ret < 0)
 		return ret;
 
+	/* is there a better way to wait for message to be transmitted */
+	msleep(100);
+
 	/* set DISEQC_MODE[2:0] to zero if a return message is expected */
 	if (c->msg[0] & 0x02) {
 		ret = mt312_writereg(state, DISEQC_MODE, (diseqc_mode & 0x40));