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[media] cx24120: Rework vco function to remove xxyyzz variable

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Change calculate_vco function to send_vco to tidy up cx24120_init
function.
xxyyzz variable is remnants of a manual div & remainder codepath
to perform a u64 rounded div; replace with kernel macro
DIV_ROUND_CLOSEST_ULL
Hex values provided to the message are mainly variables calculated
within this function, replace with these to remove hardcoding.

Signed-off-by: Jemma Denson <jdenson@gmail.com>
Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Jemma Denson 2015-05-03 08:55:15 -03:00 committed by Mauro Carvalho Chehab
parent 6ce412292a
commit c84251bb12
1 changed files with 29 additions and 34 deletions
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63
drivers/media/dvb-frontends/cx24120.c
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@ -1111,26 +1111,38 @@ static int cx24120_set_frontend(struct dvb_frontend *fe)
return 0;
}
/* Calculate vco from config */
static u64 cx24120_calculate_vco(struct cx24120_state *state)
/* Set vco from config */
static int cx24120_set_vco(struct cx24120_state *state)
{
u32 vco;
u64 inv_vco, res, xxyyzz;
struct cx24120_cmd cmd;
u32 nxtal_khz, vco;
u64 inv_vco;
u32 xtal_khz = state->config->xtal_khz;
xxyyzz = 0x400000000ULL;
vco = xtal_khz * 10 * 4;
inv_vco = xxyyzz / vco;
res = xxyyzz % vco;
if (inv_vco > xtal_khz * 10 * 2)
++inv_vco;
nxtal_khz = xtal_khz * 4;
vco = nxtal_khz * 10;
inv_vco = DIV_ROUND_CLOSEST_ULL(0x400000000ULL, vco);
dev_dbg(&state->i2c->dev,
"%s: xtal=%d, vco=%d, inv_vco=%lld, res=%lld\n",
__func__, xtal_khz, vco, inv_vco, res);
"%s: xtal=%d, vco=%d, inv_vco=%lld\n",
__func__, xtal_khz, vco, inv_vco);
return inv_vco;
cmd.id = CMD_VCO_SET;
cmd.len = 12;
cmd.arg[0] = (vco >> 16) & 0xff;
cmd.arg[1] = (vco >> 8) & 0xff;
cmd.arg[2] = vco & 0xff;
cmd.arg[3] = (inv_vco >> 8) & 0xff;
cmd.arg[4] = (inv_vco) & 0xff;
cmd.arg[5] = 0x03;
cmd.arg[6] = (nxtal_khz >> 8) & 0xff;
cmd.arg[7] = nxtal_khz & 0xff;
cmd.arg[8] = 0x06;
cmd.arg[9] = 0x03;
cmd.arg[10] = (xtal_khz >> 16) & 0xff;
cmd.arg[11] = xtal_khz & 0xff;
return cx24120_message_send(state, &cmd);
}
int cx24120_init(struct dvb_frontend *fe)
@ -1139,7 +1151,6 @@ int cx24120_init(struct dvb_frontend *fe)
struct cx24120_state *state = fe->demodulator_priv;
struct cx24120_cmd cmd;
u8 ret, ret_EA, reg1;
u64 inv_vco;
int reset_result;
int i;
@ -1251,26 +1262,10 @@ int cx24120_init(struct dvb_frontend *fe)
}
/* Set VCO */
inv_vco = cx24120_calculate_vco(state);
cmd.id = CMD_VCO_SET;
cmd.len = 12;
cmd.arg[0] = 0x06;
cmd.arg[1] = 0x2b;
cmd.arg[2] = 0xd8;
cmd.arg[3] = (inv_vco >> 8) & 0xff;
cmd.arg[4] = (inv_vco) & 0xff;
cmd.arg[5] = 0x03;
cmd.arg[6] = 0x9d;
cmd.arg[7] = 0xfc;
cmd.arg[8] = 0x06;
cmd.arg[9] = 0x03;
cmd.arg[10] = 0x27;
cmd.arg[11] = 0x7f;
if (cx24120_message_send(state, &cmd)) {
ret = cx24120_set_vco(state);
if (ret != 0) {
err("Error set VCO! :(\n");
return -EREMOTEIO;
return ret;
}
/* set bandwidth */