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Subject: media: dvb-frontends/stv0910: rework and fix DiSEqC send
Author:  Daniel Scheller <d.schel...@gmx.net>
Date:    Fri Feb 9 13:22:49 2018 -0500

Rework both DiSEqC send functions (send_master_cmd() and send_burst()) to
utilise the new SET_REG() and SET_FIELD() macros. Esp. due to SET_FIELD(),
this makes sure that not all bits (with unrelated purposes) are always
rewritten, but only those needed for sending DiSEqC commands. In
send_burst(), this makes sure that DISEQC_MODE isn't changed from 3 to 2
inbetween when sending SEC_MINI_A. Also, change both functions to write
DISEQC_MODE first before setting DIS_PRECHARGE. This makes diseqc control
work more reliable for "fullblown" DiSEqC strings in VDR's diseqc.conf in
combination with certain multiswitches.

Fixes: 448461af0e19 ("media: dvb-frontends/stv0910: implement 
diseqc_send_burst")

Reported-by: Helmut Auer <p...@helmutauer.de>
Cc: Ralph Metzler <r...@metzlerbros.de>
Signed-off-by: Daniel Scheller <d.schel...@gmx.net>
Tested-by: Helmut Auer <p...@helmutauer.de>
Tested-by: Richard Scobie <rasco...@slingshot.co.nz>
Tested-by: Dietmar Spingler <d_sping...@freenet.de>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/dvb-frontends/stv0910.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

---

diff --git a/drivers/media/dvb-frontends/stv0910.c 
b/drivers/media/dvb-frontends/stv0910.c
index a2f7c0c1587f..52355c14fd64 100644
--- a/drivers/media/dvb-frontends/stv0910.c
+++ b/drivers/media/dvb-frontends/stv0910.c
@@ -1673,15 +1673,15 @@ static int send_master_cmd(struct dvb_frontend *fe,
                           struct dvb_diseqc_master_cmd *cmd)
 {
        struct stv *state = fe->demodulator_priv;
-       u16 offs = state->nr ? 0x40 : 0;
        int i;
 
-       write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3E);
+       SET_FIELD(DISEQC_MODE, 2);
+       SET_FIELD(DIS_PRECHARGE, 1);
        for (i = 0; i < cmd->msg_len; i++) {
                wait_dis(state, 0x40, 0x00);
-               write_reg(state, RSTV0910_P1_DISTXFIFO + offs, cmd->msg[i]);
+               SET_REG(DISTXFIFO, cmd->msg[i]);
        }
-       write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3A);
+       SET_FIELD(DIS_PRECHARGE, 0);
        wait_dis(state, 0x20, 0x20);
        return 0;
 }
@@ -1689,19 +1689,20 @@ static int send_master_cmd(struct dvb_frontend *fe,
 static int send_burst(struct dvb_frontend *fe, enum fe_sec_mini_cmd burst)
 {
        struct stv *state = fe->demodulator_priv;
-       u16 offs = state->nr ? 0x40 : 0;
        u8 value;
 
        if (burst == SEC_MINI_A) {
-               write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3F);
+               SET_FIELD(DISEQC_MODE, 3);
                value = 0x00;
        } else {
-               write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3E);
+               SET_FIELD(DISEQC_MODE, 2);
                value = 0xFF;
        }
+
+       SET_FIELD(DIS_PRECHARGE, 1);
        wait_dis(state, 0x40, 0x00);
-       write_reg(state, RSTV0910_P1_DISTXFIFO + offs, value);
-       write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3A);
+       SET_REG(DISTXFIFO, value);
+       SET_FIELD(DIS_PRECHARGE, 0);
        wait_dis(state, 0x20, 0x20);
 
        return 0;

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