diff options
| author | Antti Palosaari <crope@iki.fi> | 2014-01-27 03:13:19 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-03-14 05:25:02 -0300 |
| commit | 0ed0b22dc594a533a959ed8995e69e2275af40d9 (patch) | |
| tree | bed38f3c49388190ccf27337adaee3997da00af6 /drivers/media | |
| parent | adaa616ffb697f00db9b4ccb638c5e9e719dbb7f (diff) | |
[media] e4000: fix PLL calc to allow higher frequencies
There was 32-bit overflow on VCO frequency calculation which blocks
tuning to 1073 - 1104 MHz. Use 64 bit number in order to avoid VCO
frequency overflow.
After that fix device in question tunes to following range:
60 - 1104 MHz
1250 - 2207 MHz
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/tuners/e4000.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/drivers/media/tuners/e4000.c b/drivers/media/tuners/e4000.c index 3a03b026eb0..ae52a1f4bb1 100644 --- a/drivers/media/tuners/e4000.c +++ b/drivers/media/tuners/e4000.c @@ -221,11 +221,11 @@ static int e4000_set_params(struct dvb_frontend *fe) struct e4000_priv *priv = fe->tuner_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; int ret, i, sigma_delta; - unsigned int f_vco; + u64 f_vco; u8 buf[5], i_data[4], q_data[4]; dev_dbg(&priv->client->dev, - "%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n", + "%s: delivery_system=%d frequency=%u bandwidth_hz=%u\n", __func__, c->delivery_system, c->frequency, c->bandwidth_hz); @@ -248,20 +248,16 @@ static int e4000_set_params(struct dvb_frontend *fe) goto err; } - /* - * Note: Currently f_vco overflows when c->frequency is 1 073 741 824 Hz - * or more. - */ - f_vco = c->frequency * e4000_pll_lut[i].mul; + f_vco = 1ull * c->frequency * e4000_pll_lut[i].mul; sigma_delta = div_u64(0x10000ULL * (f_vco % priv->clock), priv->clock); - buf[0] = f_vco / priv->clock; + buf[0] = div_u64(f_vco, priv->clock); buf[1] = (sigma_delta >> 0) & 0xff; buf[2] = (sigma_delta >> 8) & 0xff; buf[3] = 0x00; buf[4] = e4000_pll_lut[i].div; dev_dbg(&priv->client->dev, - "%s: f_vco=%u pll div=%d sigma_delta=%04x\n", + "%s: f_vco=%llu pll div=%d sigma_delta=%04x\n", __func__, f_vco, buf[0], sigma_delta); ret = e4000_wr_regs(priv, 0x09, buf, 5); |