Calculate PLL dividers slightly differently, most likely it is now
correct. Move some register values to innitab. Use jiffies to poll
filter lock. Fix logging.
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
drivers/media/tuners/fc2580.c | 179 +++++++++++++++++--------------------
drivers/media/tuners/fc2580_priv.h | 8 +-
2 files changed, 88 insertions(+), 99 deletions(-)
diff --git a/drivers/media/tuners/fc2580.c b/drivers/media/tuners/fc2580.c
index 48e4dae..9324855 100644
--- a/drivers/media/tuners/fc2580.c
+++ b/drivers/media/tuners/fc2580.c
@@ -33,11 +33,6 @@
* fc2580_wr_regs()
* fc2580_rd_regs()
* could not be used for accessing more than one register at once.
- *
- * TODO:
- * Currently it blind writes bunch of static registers from the
- * fc2580_freq_regs_lut[] when fc2580_set_params() is called. Add some
- * logic to reduce unneeded register writes.
*/
/* write multiple registers */
@@ -137,107 +132,110 @@ static int fc2580_wr_reg_ff(struct fc2580_priv *priv, u8 reg, u8 val)
return fc2580_wr_regs(priv, reg, &val, 1);
}
+
static int fc2580_set_params(struct dvb_frontend *fe)
{
struct fc2580_priv *priv = fe->tuner_priv;
+ struct i2c_client *client = priv->client;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
- int ret = 0, i;
- unsigned int r_val, n_val, k_val, k_val_reg, f_ref;
- u8 tmp_val, r18_val;
+ int ret, i;
+ unsigned int uitmp, div_ref, div_ref_val, div_n, k, k_cw, div_out;
u64 f_vco;
+ u8 u8tmp, synth_config;
+ unsigned long timeout;
- /*
- * Fractional-N synthesizer/PLL.
- * Most likely all those PLL calculations are not correct. I am not
- * sure, but it looks like it is divider based Fractional-N synthesizer.
- * There is divider for reference clock too?
- * Anyhow, synthesizer calculation results seems to be quite correct.
- */
-
- dev_dbg(&priv->i2c->dev, "%s: delivery_system=%d frequency=%d " \
- "bandwidth_hz=%d\n", __func__,
- c->delivery_system, c->frequency, c->bandwidth_hz);
+ dev_dbg(&client->dev,
+ "delivery_system=%u frequency=%u bandwidth_hz=%u\n",
+ c->delivery_system, c->frequency, c->bandwidth_hz);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
- /* PLL */
+ /*
+ * Fractional-N synthesizer
+ *
+ * +---------------------------------------+
+ * v |
+ * Fref +----+ +----+ +-------+ +----+ +------+ +---+
+ * ------> | /R | --> | PD | --> | VCO | ------> | /2 | --> | /N.F | <-- | K |
+ * +----+ +----+ +-------+ +----+ +------+ +---+
+ * |
+ * |
+ * v
+ * +-------+ Fout
+ * | /Rout | ------>
+ * +-------+
+ */
for (i = 0; i < ARRAY_SIZE(fc2580_pll_lut); i++) {
if (c->frequency <= fc2580_pll_lut[i].freq)
break;
}
-
- if (i == ARRAY_SIZE(fc2580_pll_lut))
+ if (i == ARRAY_SIZE(fc2580_pll_lut)) {
+ ret = -EINVAL;
goto err;
+ }
- f_vco = c->frequency;
- f_vco *= fc2580_pll_lut[i].div;
-
- if (f_vco >= 2600000000UL)
- tmp_val = 0x0e | fc2580_pll_lut[i].band;
+ #define DIV_PRE_N 2
+ #define F_REF priv->clk
+ div_out = fc2580_pll_lut[i].div_out;
+ f_vco = (u64) c->frequency * div_out;
+ synth_config = fc2580_pll_lut[i].band;
+ if (f_vco < 2600000000ULL)
+ synth_config |= 0x06;
else
- tmp_val = 0x06 | fc2580_pll_lut[i].band;
-
- ret = fc2580_wr_reg(priv, 0x02, tmp_val);
- if (ret < 0)
- goto err;
-
- if (f_vco >= 2UL * 76 * priv->clk) {
- r_val = 1;
- r18_val = 0x00;
- } else if (f_vco >= 1UL * 76 * priv->clk) {
- r_val = 2;
- r18_val = 0x10;
+ synth_config |= 0x0e;
+
+ /* select reference divider R (keep PLL div N in valid range) */
+ #define DIV_N_MIN 76
+ if (f_vco >= div_u64((u64) DIV_PRE_N * DIV_N_MIN * F_REF, 1)) {
+ div_ref = 1;
+ div_ref_val = 0x00;
+ } else if (f_vco >= div_u64((u64) DIV_PRE_N * DIV_N_MIN * F_REF, 2)) {
+ div_ref = 2;
+ div_ref_val = 0x10;
} else {
- r_val = 4;
- r18_val = 0x20;
+ div_ref = 4;
+ div_ref_val = 0x20;
}
- f_ref = 2UL * priv->clk / r_val;
- n_val = div_u64_rem(f_vco, f_ref, &k_val);
- k_val_reg = div_u64(1ULL * k_val * (1 << 20), f_ref);
+ /* calculate PLL integer and fractional control word */
+ uitmp = DIV_PRE_N * F_REF / div_ref;
+ div_n = div_u64_rem(f_vco, uitmp, &k);
+ k_cw = div_u64((u64) k * 0x100000, uitmp);
- ret = fc2580_wr_reg(priv, 0x18, r18_val | ((k_val_reg >> 16) & 0xff));
+ dev_dbg(&client->dev,
+ "frequency=%u f_vco=%llu F_REF=%u div_ref=%u div_n=%u k=%u div_out=%u k_cw=%0x\n",
+ c->frequency, f_vco, F_REF, div_ref, div_n, k, div_out, k_cw);
+
+ ret = fc2580_wr_reg(priv, 0x02, synth_config);
if (ret < 0)
goto err;
- ret = fc2580_wr_reg(priv, 0x1a, (k_val_reg >> 8) & 0xff);
+ ret = fc2580_wr_reg(priv, 0x18, div_ref_val << 0 | k_cw >> 16);
if (ret < 0)
goto err;
- ret = fc2580_wr_reg(priv, 0x1b, (k_val_reg >> 0) & 0xff);
+ ret = fc2580_wr_reg(priv, 0x1a, (k_cw >> 8) & 0xff);
if (ret < 0)
goto err;
- ret = fc2580_wr_reg(priv, 0x1c, n_val);
+ ret = fc2580_wr_reg(priv, 0x1b, (k_cw >> 0) & 0xff);
if (ret < 0)
goto err;
- if (priv->clk >= 28000000) {
- ret = fc2580_wr_reg(priv, 0x4b, 0x22);
- if (ret < 0)
- goto err;
- }
-
- if (fc2580_pll_lut[i].band == 0x00) {
- if (c->frequency <= 794000000)
- tmp_val = 0x9f;
- else
- tmp_val = 0x8f;
-
- ret = fc2580_wr_reg(priv, 0x2d, tmp_val);
- if (ret < 0)
- goto err;
- }
+ ret = fc2580_wr_reg(priv, 0x1c, div_n);
+ if (ret < 0)
+ goto err;
/* registers */
for (i = 0; i < ARRAY_SIZE(fc2580_freq_regs_lut); i++) {
if (c->frequency <= fc2580_freq_regs_lut[i].freq)
break;
}
-
- if (i == ARRAY_SIZE(fc2580_freq_regs_lut))
+ if (i == ARRAY_SIZE(fc2580_freq_regs_lut)) {
+ ret = -EINVAL;
goto err;
+ }
ret = fc2580_wr_reg_ff(priv, 0x25, fc2580_freq_regs_lut[i].r25_val);
if (ret < 0)
@@ -340,16 +338,18 @@ static int fc2580_set_params(struct dvb_frontend *fe)
if (c->bandwidth_hz <= fc2580_if_filter_lut[i].freq)
break;
}
-
- if (i == ARRAY_SIZE(fc2580_if_filter_lut))
+ if (i == ARRAY_SIZE(fc2580_if_filter_lut)) {
+ ret = -EINVAL;
goto err;
+ }
ret = fc2580_wr_reg(priv, 0x36, fc2580_if_filter_lut[i].r36_val);
if (ret < 0)
goto err;
- ret = fc2580_wr_reg(priv, 0x37, div_u64(1ULL * priv->clk *
- fc2580_if_filter_lut[i].mul, 1000000000));
+ u8tmp = div_u64((u64) priv->clk * fc2580_if_filter_lut[i].mul,
+ 1000000000);
+ ret = fc2580_wr_reg(priv, 0x37, u8tmp);
if (ret < 0)
goto err;
@@ -357,36 +357,25 @@ static int fc2580_set_params(struct dvb_frontend *fe)
if (ret < 0)
goto err;
- /* calibration? */
- ret = fc2580_wr_reg(priv, 0x2e, 0x09);
- if (ret < 0)
- goto err;
-
- for (i = 0; i < 5; i++) {
- ret = fc2580_rd_reg(priv, 0x2f, &tmp_val);
- if (ret < 0)
+ timeout = jiffies + msecs_to_jiffies(30);
+ for (uitmp = ~0xc0; !time_after(jiffies, timeout) && uitmp != 0xc0;) {
+ /* trigger filter */
+ ret = fc2580_wr_reg(priv, 0x2e, 0x09);
+ if (ret)
goto err;
- /* done when [7:6] are set */
- if ((tmp_val & 0xc0) == 0xc0)
- break;
-
- ret = fc2580_wr_reg(priv, 0x2e, 0x01);
- if (ret < 0)
+ /* locked when [7:6] are set (val: d7 6MHz, d5 7MHz, cd 8MHz) */
+ ret = fc2580_rd_reg(priv, 0x2f, &u8tmp);
+ if (ret)
goto err;
+ uitmp = u8tmp & 0xc0;
- ret = fc2580_wr_reg(priv, 0x2e, 0x09);
- if (ret < 0)
+ ret = fc2580_wr_reg(priv, 0x2e, 0x01);
+ if (ret)
goto err;
-
- usleep_range(5000, 25000);
}
-
- dev_dbg(&priv->i2c->dev, "%s: loop=%i\n", __func__, i);
-
- ret = fc2580_wr_reg(priv, 0x2e, 0x01);
- if (ret < 0)
- goto err;
+ if (uitmp != 0xc0)
+ dev_dbg(&client->dev, "filter did not lock %02x\n", uitmp);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
@@ -396,7 +385,7 @@ err:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
- dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+ dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
diff --git a/drivers/media/tuners/fc2580_priv.h b/drivers/media/tuners/fc2580_priv.h
index a22ffc6..068531b 100644
--- a/drivers/media/tuners/fc2580_priv.h
+++ b/drivers/media/tuners/fc2580_priv.h
@@ -50,7 +50,7 @@ static const struct fc2580_reg_val fc2580_init_reg_vals[] = {
struct fc2580_pll {
u32 freq;
- u8 div;
+ u8 div_out;
u8 band;
};
@@ -110,15 +110,15 @@ static const struct fc2580_freq_regs fc2580_freq_regs_lut[] = {
0x50, 0x0f, 0x07, 0x00, 0x15, 0x03, 0x05, 0x10, 0x12, 0x08,
0x0a, 0x78, 0x32, 0x54},
{ 538000000,
- 0xf0, 0x77, 0x53, 0x60, 0xff, 0xff, 0xff, 0x09, 0xff, 0x8c,
+ 0xf0, 0x77, 0x53, 0x60, 0xff, 0xff, 0x9f, 0x09, 0xff, 0x8c,
0x50, 0x13, 0x07, 0x06, 0x15, 0x06, 0x08, 0x10, 0x12, 0x0b,
0x0c, 0x78, 0x32, 0x14},
{ 794000000,
- 0xf0, 0x77, 0x53, 0x60, 0xff, 0xff, 0xff, 0x09, 0xff, 0x8c,
+ 0xf0, 0x77, 0x53, 0x60, 0xff, 0xff, 0x9f, 0x09, 0xff, 0x8c,
0x50, 0x15, 0x03, 0x03, 0x15, 0x03, 0x05, 0x0c, 0x0e, 0x0b,
0x0c, 0x78, 0x32, 0x14},
{1000000000,
- 0xf0, 0x77, 0x53, 0x60, 0xff, 0xff, 0xff, 0x09, 0xff, 0x8c,
+ 0xf0, 0x77, 0x53, 0x60, 0xff, 0xff, 0x8f, 0x09, 0xff, 0x8c,
0x50, 0x15, 0x07, 0x06, 0x15, 0x07, 0x09, 0x10, 0x12, 0x0b,
0x0c, 0x78, 0x32, 0x14},
{0xffffffff,
--
http://palosaari.fi/
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