diff options
| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-03-04 08:15:49 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-03-04 16:37:07 -0300 |
| commit | 0e4bbedd638d6d13b0cfe2c95c75fc3736daec94 (patch) | |
| tree | bdc113859e2503e298a1d066d6cc0c329507e8a5 /drivers/media/dvb-frontends/mb86a20s.c | |
| parent | 04fa725e7b1c22c583dd71a8cd85b8d997edfce3 (diff) | |
[media] mb86a20s: Don't assume a 32.57142MHz clock
Now that some devices initialize register 0x2a with different
values, add the calculus formula, instead of hardcoding it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb-frontends/mb86a20s.c')
| -rw-r--r-- | drivers/media/dvb-frontends/mb86a20s.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/media/dvb-frontends/mb86a20s.c b/drivers/media/dvb-frontends/mb86a20s.c index 1859e9ddba6..d04b52e3f4c 100644 --- a/drivers/media/dvb-frontends/mb86a20s.c +++ b/drivers/media/dvb-frontends/mb86a20s.c @@ -70,7 +70,6 @@ static struct regdata mb86a20s_init1[] = { { 0x70, 0xff }, { 0x08, 0x01 }, { 0x50, 0xd1 }, { 0x51, 0x20 }, - { 0x28, 0x2a }, { 0x29, 0x00 }, { 0x2a, 0xff }, { 0x2b, 0x80 }, }; static struct regdata mb86a20s_init2[] = { @@ -1776,6 +1775,7 @@ static int mb86a20s_initfe(struct dvb_frontend *fe) { struct mb86a20s_state *state = fe->demodulator_priv; u64 pll; + u32 fclk; int rc; u8 regD5 = 1, reg71, reg09 = 0x3a; @@ -1810,6 +1810,10 @@ static int mb86a20s_initfe(struct dvb_frontend *fe) goto err; } + fclk = state->config->fclk; + if (!fclk) + fclk = 32571428; + /* Adjust IF frequency to match tuner */ if (fe->ops.tuner_ops.get_if_frequency) fe->ops.tuner_ops.get_if_frequency(fe, &state->if_freq); @@ -1817,6 +1821,24 @@ static int mb86a20s_initfe(struct dvb_frontend *fe) if (!state->if_freq) state->if_freq = 3300000; + pll = (((u64)1) << 34) * state->if_freq; + do_div(pll, 63 * fclk); + pll = (1 << 25) - pll; + rc = mb86a20s_writereg(state, 0x28, 0x2a); + if (rc < 0) + goto err; + rc = mb86a20s_writereg(state, 0x29, (pll >> 16) & 0xff); + if (rc < 0) + goto err; + rc = mb86a20s_writereg(state, 0x2a, (pll >> 8) & 0xff); + if (rc < 0) + goto err; + rc = mb86a20s_writereg(state, 0x2b, pll & 0xff); + if (rc < 0) + goto err; + dev_dbg(&state->i2c->dev, "%s: fclk=%d, IF=%d, clock reg=0x%06llx\n", + __func__, fclk, state->if_freq, (long long)pll); + /* pll = freq[Hz] * 2^24/10^6 / 16.285714286 */ pll = state->if_freq * 1677721600L; do_div(pll, 1628571429L); @@ -1832,7 +1854,7 @@ static int mb86a20s_initfe(struct dvb_frontend *fe) rc = mb86a20s_writereg(state, 0x2b, pll & 0xff); if (rc < 0) goto err; - dev_dbg(&state->i2c->dev, "%s: IF=%d, PLL=0x%06llx\n", + dev_dbg(&state->i2c->dev, "%s: IF=%d, IF reg=0x%06llx\n", __func__, state->if_freq, (long long)pll); if (!state->config->is_serial) { |