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Subject: [media] cxd2841er: freeze/unfreeze registers when reading stats
Author:  Abylay Ospan <aos...@netup.ru>
Date:    Tue Jul 19 00:10:20 2016 -0300

ensure multiple separate register reads are from the same snapshot

Signed-off-by: Abylay Ospan <aos...@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/dvb-frontends/cxd2841er.c | 52 +++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 12 deletions(-)

---

diff --git a/drivers/media/dvb-frontends/cxd2841er.c 
b/drivers/media/dvb-frontends/cxd2841er.c
index ffe88bc6b813..0a2cd133ad9a 100644
--- a/drivers/media/dvb-frontends/cxd2841er.c
+++ b/drivers/media/dvb-frontends/cxd2841er.c
@@ -1570,6 +1570,25 @@ static int cxd2841er_read_ber_t(struct cxd2841er_priv 
*priv,
        return 0;
 }
 
+static int cxd2841er_freeze_regs(struct cxd2841er_priv *priv)
+{
+       /*
+        * Freeze registers: ensure multiple separate register reads
+        * are from the same snapshot
+        */
+       cxd2841er_write_reg(priv, I2C_SLVT, 0x01, 0x01);
+       return 0;
+}
+
+static int cxd2841er_unfreeze_regs(struct cxd2841er_priv *priv)
+{
+       /*
+        * un-freeze registers
+        */
+       cxd2841er_write_reg(priv, I2C_SLVT, 0x01, 0x00);
+       return 0;
+}
+
 static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv *priv,
                u8 delsys, u32 *snr)
 {
@@ -1578,6 +1597,7 @@ static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv 
*priv,
        int min_index, max_index, index;
        static const struct cxd2841er_cnr_data *cn_data;
 
+       cxd2841er_freeze_regs(priv);
        /* Set SLV-T Bank : 0xA1 */
        cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0xa1);
        /*
@@ -1629,9 +1649,11 @@ static u32 cxd2841er_dvbs_read_snr(struct cxd2841er_priv 
*priv,
        } else {
                dev_dbg(&priv->i2c->dev,
                        "%s(): no data available\n", __func__);
+               cxd2841er_unfreeze_regs(priv);
                return -EINVAL;
        }
 done:
+       cxd2841er_unfreeze_regs(priv);
        *snr = res;
        return 0;
 }
@@ -1655,12 +1677,7 @@ static int cxd2841er_read_snr_c(struct cxd2841er_priv 
*priv, u32 *snr)
                return -EINVAL;
        }
 
-       /*
-        * Freeze registers: ensure multiple separate register reads
-        * are from the same snapshot
-        */
-       cxd2841er_write_reg(priv, I2C_SLVT, 0x01, 0x01);
-
+       cxd2841er_freeze_regs(priv);
        cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x40);
        cxd2841er_read_regs(priv, I2C_SLVT, 0x19, data, 1);
        qam = (enum sony_dvbc_constellation_t) (data[0] & 0x07);
@@ -1670,6 +1687,7 @@ static int cxd2841er_read_snr_c(struct cxd2841er_priv 
*priv, u32 *snr)
        if (reg == 0) {
                dev_dbg(&priv->i2c->dev,
                                "%s(): reg value out of range\n", __func__);
+               cxd2841er_unfreeze_regs(priv);
                return 0;
        }
 
@@ -1690,9 +1708,11 @@ static int cxd2841er_read_snr_c(struct cxd2841er_priv 
*priv, u32 *snr)
                *snr = -88 * (int32_t)sony_log(reg) + 86999;
                break;
        default:
+               cxd2841er_unfreeze_regs(priv);
                return -EINVAL;
        }
 
+       cxd2841er_unfreeze_regs(priv);
        return 0;
 }
 
@@ -1707,17 +1727,21 @@ static int cxd2841er_read_snr_t(struct cxd2841er_priv 
*priv, u32 *snr)
                        "%s(): invalid state %d\n", __func__, priv->state);
                return -EINVAL;
        }
+
+       cxd2841er_freeze_regs(priv);
        cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x10);
        cxd2841er_read_regs(priv, I2C_SLVT, 0x28, data, sizeof(data));
        reg = ((u32)data[0] << 8) | (u32)data[1];
        if (reg == 0) {
                dev_dbg(&priv->i2c->dev,
                        "%s(): reg value out of range\n", __func__);
+               cxd2841er_unfreeze_regs(priv);
                return 0;
        }
        if (reg > 4996)
                reg = 4996;
        *snr = 10000 * ((intlog10(reg) - intlog10(5350 - reg)) >> 24) + 28500;
+       cxd2841er_unfreeze_regs(priv);
        return 0;
 }
 
@@ -1732,18 +1756,22 @@ static int cxd2841er_read_snr_t2(struct cxd2841er_priv 
*priv, u32 *snr)
                        "%s(): invalid state %d\n", __func__, priv->state);
                return -EINVAL;
        }
+
+       cxd2841er_freeze_regs(priv);
        cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x20);
        cxd2841er_read_regs(priv, I2C_SLVT, 0x28, data, sizeof(data));
        reg = ((u32)data[0] << 8) | (u32)data[1];
        if (reg == 0) {
                dev_dbg(&priv->i2c->dev,
                        "%s(): reg value out of range\n", __func__);
+               cxd2841er_unfreeze_regs(priv);
                return 0;
        }
        if (reg > 10876)
                reg = 10876;
        *snr = 10000 * ((intlog10(reg) -
                intlog10(12600 - reg)) >> 24) + 32000;
+       cxd2841er_unfreeze_regs(priv);
        return 0;
 }
 
@@ -1760,21 +1788,20 @@ static int cxd2841er_read_snr_i(struct cxd2841er_priv 
*priv, u32 *snr)
                return -EINVAL;
        }
 
-       /* Freeze all registers */
-       cxd2841er_write_reg(priv, I2C_SLVT, 0x01, 0x01);
-
-
+       cxd2841er_freeze_regs(priv);
        cxd2841er_write_reg(priv, I2C_SLVT, 0x00, 0x60);
        cxd2841er_read_regs(priv, I2C_SLVT, 0x28, data, sizeof(data));
        reg = ((u32)data[0] << 8) | (u32)data[1];
        if (reg == 0) {
                dev_dbg(&priv->i2c->dev,
                                "%s(): reg value out of range\n", __func__);
+               cxd2841er_unfreeze_regs(priv);
                return 0;
        }
        if (reg > 4996)
                reg = 4996;
        *snr = 100 * intlog10(reg) - 9031;
+       cxd2841er_unfreeze_regs(priv);
        return 0;
 }
 
@@ -1977,7 +2004,7 @@ static void cxd2841er_read_ucblocks(struct dvb_frontend 
*fe)
 {
        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
        struct cxd2841er_priv *priv = fe->demodulator_priv;
-       u32 ucblocks;
+       u32 ucblocks = 0;
 
        dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
        switch (p->delivery_system) {
@@ -1999,7 +2026,7 @@ static void cxd2841er_read_ucblocks(struct dvb_frontend 
*fe)
                p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
                return;
        }
-       dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
+       dev_dbg(&priv->i2c->dev, "%s() ucblocks=%u\n", __func__, ucblocks);
 
        p->block_error.stat[0].scale = FE_SCALE_COUNTER;
        p->block_error.stat[0].uvalue = ucblocks;
@@ -3076,6 +3103,7 @@ static int cxd2841er_sleep_tc_to_active_c(struct 
cxd2841er_priv *priv,
        /* Enable demod clock */
        cxd2841er_write_reg(priv, I2C_SLVT, 0x2c, 0x01);
        /* Disable RF level monitor */
+       cxd2841er_write_reg(priv, I2C_SLVT, 0x59, 0x00);
        cxd2841er_write_reg(priv, I2C_SLVT, 0x2f, 0x00);
        /* Enable ADC clock */
        cxd2841er_write_reg(priv, I2C_SLVT, 0x30, 0x00);

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