Skip to content

Commit

Permalink
[media] rtl2832: change the i2c gate to be mux-locked
Browse files Browse the repository at this point in the history 
The root i2c adapter lock is then no longer held by the i2c mux during
accesses behind the i2c gate, and such accesses need to take that lock
just like any other ordinary i2c accesses do.

So, declare the i2c gate mux-locked, and zap the regmap overrides
that makes the i2c accesses unlocked and use plain old regmap
accesses. This also removes the need for the regmap wrappers used by
rtl2832_sdr, so deconvolute the code further and provide the regmap
handle directly instead of the wrapper functions.

Tested-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Peter Rosin <peda@axentia.se>
  • Loading branch information
@peda-r
peda-r committed Apr 22, 2016
1 parent 31db1d9 commit c023584
Show file tree
Hide file tree
Showing 6 changed files with 37 additions and 182 deletions.
2 changes: 1 addition & 1 deletion Documentation/i2c/i2c-topology
View file
Expand Up @@ -55,7 +55,7 @@ imu/inv_mpu6050/ Mux-locked
In drivers/media/
dvb-frontends/m88ds3103 Parent-locked
dvb-frontends/rtl2830 Parent-locked
dvb-frontends/rtl2832 Parent-locked
dvb-frontends/rtl2832 Mux-locked
dvb-frontends/si2168 Mux-locked
usb/cx231xx/ Parent-locked

Expand Down
190 changes: 26 additions & 164 deletions drivers/media/dvb-frontends/rtl2832.c
View file
Expand Up @@ -153,43 +153,6 @@ static const struct rtl2832_reg_entry registers[] = {
[DVBT_REG_4MSEL] = {0x013, 0, 0},
};

/* Our regmap is bypassing I2C adapter lock, thus we do it! */
static int rtl2832_bulk_write(struct i2c_client *client, unsigned int reg,
const void *val, size_t val_count)
{
struct rtl2832_dev *dev = i2c_get_clientdata(client);
int ret;

i2c_lock_adapter(client->adapter);
ret = regmap_bulk_write(dev->regmap, reg, val, val_count);
i2c_unlock_adapter(client->adapter);
return ret;
}

static int rtl2832_update_bits(struct i2c_client *client, unsigned int reg,
unsigned int mask, unsigned int val)
{
struct rtl2832_dev *dev = i2c_get_clientdata(client);
int ret;

i2c_lock_adapter(client->adapter);
ret = regmap_update_bits(dev->regmap, reg, mask, val);
i2c_unlock_adapter(client->adapter);
return ret;
}

static int rtl2832_bulk_read(struct i2c_client *client, unsigned int reg,
void *val, size_t val_count)
{
struct rtl2832_dev *dev = i2c_get_clientdata(client);
int ret;

i2c_lock_adapter(client->adapter);
ret = regmap_bulk_read(dev->regmap, reg, val, val_count);
i2c_unlock_adapter(client->adapter);
return ret;
}

static int rtl2832_rd_demod_reg(struct rtl2832_dev *dev, int reg, u32 *val)
{
struct i2c_client *client = dev->client;
Expand All @@ -204,7 +167,7 @@ static int rtl2832_rd_demod_reg(struct rtl2832_dev *dev, int reg, u32 *val)
len = (msb >> 3) + 1;
mask = REG_MASK(msb - lsb);

ret = rtl2832_bulk_read(client, reg_start_addr, reading, len);
ret = regmap_bulk_read(dev->regmap, reg_start_addr, reading, len);
if (ret)
goto err;

Expand Down Expand Up @@ -234,7 +197,7 @@ static int rtl2832_wr_demod_reg(struct rtl2832_dev *dev, int reg, u32 val)
len = (msb >> 3) + 1;
mask = REG_MASK(msb - lsb);

ret = rtl2832_bulk_read(client, reg_start_addr, reading, len);
ret = regmap_bulk_read(dev->regmap, reg_start_addr, reading, len);
if (ret)
goto err;

Expand All @@ -248,7 +211,7 @@ static int rtl2832_wr_demod_reg(struct rtl2832_dev *dev, int reg, u32 val)
for (i = 0; i < len; i++)
writing[i] = (writing_tmp >> ((len - 1 - i) * 8)) & 0xff;

ret = rtl2832_bulk_write(client, reg_start_addr, writing, len);
ret = regmap_bulk_write(dev->regmap, reg_start_addr, writing, len);
if (ret)
goto err;

Expand Down Expand Up @@ -525,7 +488,8 @@ static int rtl2832_set_frontend(struct dvb_frontend *fe)
}

for (j = 0; j < sizeof(bw_params[0]); j++) {
ret = rtl2832_bulk_write(client, 0x11c + j, &bw_params[i][j], 1);
ret = regmap_bulk_write(dev->regmap,
0x11c + j, &bw_params[i][j], 1);
if (ret)
goto err;
}
Expand Down Expand Up @@ -581,11 +545,11 @@ static int rtl2832_get_frontend(struct dvb_frontend *fe,
if (dev->sleeping)
return 0;

ret = rtl2832_bulk_read(client, 0x33c, buf, 2);
ret = regmap_bulk_read(dev->regmap, 0x33c, buf, 2);
if (ret)
goto err;

ret = rtl2832_bulk_read(client, 0x351, &buf[2], 1);
ret = regmap_bulk_read(dev->regmap, 0x351, &buf[2], 1);
if (ret)
goto err;

Expand Down Expand Up @@ -716,7 +680,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status)
/* signal strength */
if (dev->fe_status & FE_HAS_SIGNAL) {
/* read digital AGC */
ret = rtl2832_bulk_read(client, 0x305, &u8tmp, 1);
ret = regmap_bulk_read(dev->regmap, 0x305, &u8tmp, 1);
if (ret)
goto err;

Expand All @@ -742,7 +706,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status)
{87659938, 87659938, 87885178, 88241743},
};

ret = rtl2832_bulk_read(client, 0x33c, &u8tmp, 1);
ret = regmap_bulk_read(dev->regmap, 0x33c, &u8tmp, 1);
if (ret)
goto err;

Expand All @@ -754,7 +718,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status)
if (hierarchy > HIERARCHY_NUM - 1)
goto err;

ret = rtl2832_bulk_read(client, 0x40c, buf, 2);
ret = regmap_bulk_read(dev->regmap, 0x40c, buf, 2);
if (ret)
goto err;

Expand All @@ -775,7 +739,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, enum fe_status *status)

/* BER */
if (dev->fe_status & FE_HAS_LOCK) {
ret = rtl2832_bulk_read(client, 0x34e, buf, 2);
ret = regmap_bulk_read(dev->regmap, 0x34e, buf, 2);
if (ret)
goto err;

Expand Down Expand Up @@ -825,8 +789,6 @@ static int rtl2832_read_ber(struct dvb_frontend *fe, u32 *ber)

/*
* I2C gate/mux/repeater logic
* We must use unlocked __i2c_transfer() here (through regmap) because of I2C
* adapter lock is already taken by tuner driver.
* There is delay mechanism to avoid unneeded I2C gate open / close. Gate close
* is delayed here a little bit in order to see if there is sequence of I2C
* messages sent to same I2C bus.
Expand All @@ -838,7 +800,7 @@ static void rtl2832_i2c_gate_work(struct work_struct *work)
int ret;

/* close gate */
ret = rtl2832_update_bits(dev->client, 0x101, 0x08, 0x00);
ret = regmap_update_bits(dev->regmap, 0x101, 0x08, 0x00);
if (ret)
goto err;

Expand All @@ -856,10 +818,7 @@ static int rtl2832_select(struct i2c_mux_core *muxc, u32 chan_id)
/* terminate possible gate closing */
cancel_delayed_work(&dev->i2c_gate_work);

/*
* I2C adapter lock is already taken and due to that we will use
* regmap_update_bits() which does not lock again I2C adapter.
*/
/* open gate */
ret = regmap_update_bits(dev->regmap, 0x101, 0x08, 0x08);
if (ret)
goto err;
Expand Down Expand Up @@ -931,94 +890,6 @@ static bool rtl2832_volatile_reg(struct device *dev, unsigned int reg)
return false;
}

/*
* We implement own I2C access routines for regmap in order to get manual access
* to I2C adapter lock, which is needed for I2C mux adapter.
*/
static int rtl2832_regmap_read(void *context, const void *reg_buf,
size_t reg_size, void *val_buf, size_t val_size)
{
struct i2c_client *client = context;
int ret;
struct i2c_msg msg[2] = {
{
.addr = client->addr,
.flags = 0,
.len = reg_size,
.buf = (u8 *)reg_buf,
}, {
.addr = client->addr,
.flags = I2C_M_RD,
.len = val_size,
.buf = val_buf,
}
};

ret = __i2c_transfer(client->adapter, msg, 2);
if (ret != 2) {
dev_warn(&client->dev, "i2c reg read failed %d reg %02x\n",
ret, *(u8 *)reg_buf);
if (ret >= 0)
ret = -EREMOTEIO;
return ret;
}
return 0;
}

static int rtl2832_regmap_write(void *context, const void *data, size_t count)
{
struct i2c_client *client = context;
int ret;
struct i2c_msg msg[1] = {
{
.addr = client->addr,
.flags = 0,
.len = count,
.buf = (u8 *)data,
}
};

ret = __i2c_transfer(client->adapter, msg, 1);
if (ret != 1) {
dev_warn(&client->dev, "i2c reg write failed %d reg %02x\n",
ret, *(u8 *)data);
if (ret >= 0)
ret = -EREMOTEIO;
return ret;
}
return 0;
}

static int rtl2832_regmap_gather_write(void *context, const void *reg,
size_t reg_len, const void *val,
size_t val_len)
{
struct i2c_client *client = context;
int ret;
u8 buf[256];
struct i2c_msg msg[1] = {
{
.addr = client->addr,
.flags = 0,
.len = 1 + val_len,
.buf = buf,
}
};

buf[0] = *(u8 const *)reg;
memcpy(&buf[1], val, val_len);

ret = __i2c_transfer(client->adapter, msg, 1);
if (ret != 1) {
dev_warn(&client->dev, "i2c reg write failed %d reg %02x\n",
ret, *(u8 const *)reg);
if (ret >= 0)
ret = -EREMOTEIO;
return ret;
}
return 0;
}

/*
* FIXME: Hack. Implement own regmap locking in order to silence lockdep
* recursive lock warning. That happens when regmap I2C client calls I2C mux
Expand Down Expand Up @@ -1072,29 +943,29 @@ static int rtl2832_slave_ts_ctrl(struct i2c_client *client, bool enable)
ret = rtl2832_wr_demod_reg(dev, DVBT_SOFT_RST, 0x0);
if (ret)
goto err;
ret = rtl2832_bulk_write(client, 0x10c, "\x5f\xff", 2);
ret = regmap_bulk_write(dev->regmap, 0x10c, "\x5f\xff", 2);
if (ret)
goto err;
ret = rtl2832_wr_demod_reg(dev, DVBT_PIP_ON, 0x1);
if (ret)
goto err;
ret = rtl2832_bulk_write(client, 0x0bc, "\x18", 1);
ret = regmap_bulk_write(dev->regmap, 0x0bc, "\x18", 1);
if (ret)
goto err;
ret = rtl2832_bulk_write(client, 0x192, "\x7f\xf7\xff", 3);
ret = regmap_bulk_write(dev->regmap, 0x192, "\x7f\xf7\xff", 3);
if (ret)
goto err;
} else {
ret = rtl2832_bulk_write(client, 0x192, "\x00\x0f\xff", 3);
ret = regmap_bulk_write(dev->regmap, 0x192, "\x00\x0f\xff", 3);
if (ret)
goto err;
ret = rtl2832_bulk_write(client, 0x0bc, "\x08", 1);
ret = regmap_bulk_write(dev->regmap, 0x0bc, "\x08", 1);
if (ret)
goto err;
ret = rtl2832_wr_demod_reg(dev, DVBT_PIP_ON, 0x0);
if (ret)
goto err;
ret = rtl2832_bulk_write(client, 0x10c, "\x00\x00", 2);
ret = regmap_bulk_write(dev->regmap, 0x10c, "\x00\x00", 2);
if (ret)
goto err;
ret = rtl2832_wr_demod_reg(dev, DVBT_SOFT_RST, 0x1);
Expand Down Expand Up @@ -1123,7 +994,7 @@ static int rtl2832_pid_filter_ctrl(struct dvb_frontend *fe, int onoff)
else
u8tmp = 0x00;

ret = rtl2832_update_bits(client, 0x061, 0xc0, u8tmp);
ret = regmap_update_bits(dev->regmap, 0x061, 0xc0, u8tmp);
if (ret)
goto err;

Expand Down Expand Up @@ -1158,14 +1029,14 @@ static int rtl2832_pid_filter(struct dvb_frontend *fe, u8 index, u16 pid,
buf[1] = (dev->filters >> 8) & 0xff;
buf[2] = (dev->filters >> 16) & 0xff;
buf[3] = (dev->filters >> 24) & 0xff;
ret = rtl2832_bulk_write(client, 0x062, buf, 4);
ret = regmap_bulk_write(dev->regmap, 0x062, buf, 4);
if (ret)
goto err;

/* add PID */
buf[0] = (pid >> 8) & 0xff;
buf[1] = (pid >> 0) & 0xff;
ret = rtl2832_bulk_write(client, 0x066 + 2 * index, buf, 2);
ret = regmap_bulk_write(dev->regmap, 0x066 + 2 * index, buf, 2);
if (ret)
goto err;

Expand All @@ -1183,12 +1054,6 @@ static int rtl2832_probe(struct i2c_client *client,
struct rtl2832_dev *dev;
int ret;
u8 tmp;
static const struct regmap_bus regmap_bus = {
.read = rtl2832_regmap_read,
.write = rtl2832_regmap_write,
.gather_write = rtl2832_regmap_gather_write,
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
};
static const struct regmap_range_cfg regmap_range_cfg[] = {
{
.selector_reg = 0x00,
Expand Down Expand Up @@ -1228,20 +1093,19 @@ static int rtl2832_probe(struct i2c_client *client,
dev->regmap_config.ranges = regmap_range_cfg,
dev->regmap_config.num_ranges = ARRAY_SIZE(regmap_range_cfg),
dev->regmap_config.cache_type = REGCACHE_NONE,
dev->regmap = regmap_init(&client->dev, &regmap_bus, client,
&dev->regmap_config);
dev->regmap = regmap_init_i2c(client, &dev->regmap_config);
if (IS_ERR(dev->regmap)) {
ret = PTR_ERR(dev->regmap);
goto err_kfree;
}

/* check if the demod is there */
ret = rtl2832_bulk_read(client, 0x000, &tmp, 1);
ret = regmap_bulk_read(dev->regmap, 0x000, &tmp, 1);
if (ret)
goto err_regmap_exit;

/* create muxed i2c adapter for demod tuner bus */
dev->muxc = i2c_mux_alloc(i2c, &i2c->dev, 1, 0, 0,
dev->muxc = i2c_mux_alloc(i2c, &i2c->dev, 1, 0, I2C_MUX_LOCKED,
rtl2832_select, rtl2832_deselect);
if (!dev->muxc) {
ret = -ENOMEM;
Expand All @@ -1262,9 +1126,7 @@ static int rtl2832_probe(struct i2c_client *client,
pdata->slave_ts_ctrl = rtl2832_slave_ts_ctrl;
pdata->pid_filter = rtl2832_pid_filter;
pdata->pid_filter_ctrl = rtl2832_pid_filter_ctrl;
pdata->bulk_read = rtl2832_bulk_read;
pdata->bulk_write = rtl2832_bulk_write;
pdata->update_bits = rtl2832_update_bits;
pdata->regmap = dev->regmap;

dev_info(&client->dev, "Realtek RTL2832 successfully attached\n");
return 0;
Expand Down
4 changes: 1 addition & 3 deletions drivers/media/dvb-frontends/rtl2832.h
View file
Expand Up @@ -57,9 +57,7 @@ struct rtl2832_platform_data {
int (*pid_filter)(struct dvb_frontend *, u8, u16, int);
int (*pid_filter_ctrl)(struct dvb_frontend *, int);
/* private: Register access for SDR module use only */
int (*bulk_read)(struct i2c_client *, unsigned int, void *, size_t);
int (*bulk_write)(struct i2c_client *, unsigned int, const void *, size_t);
int (*update_bits)(struct i2c_client *, unsigned int, unsigned int, unsigned int);
struct regmap *regmap;
};

#endif /* RTL2832_H */

0 comments on commit c023584

Please sign in to comment.