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i2c: mlxcpld: Allow flexible polling time setting for I2C transactions 

Allow polling time setting according to I2C frequency supported across
the system. For base frequency 400 KHz and 1 MHz set polling time is set
four times less than for system with base frequency 100KHz.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Vadim Pasternak 2021-08-23 17:45:04 +03:00 committed by Wolfram Sang
parent 3abdc89b5e
commit 712d6617d0
1 changed files with 8 additions and 4 deletions
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12
drivers/i2c/busses/i2c-mlxcpld.c
View File

@ -73,6 +73,7 @@ struct mlxcpld_i2c_priv {
struct mlxcpld_i2c_curr_xfer xfer;
struct device *dev;
bool smbus_block;
int polling_time;
};
static void mlxcpld_i2c_lpc_write_buf(u8 *data, u8 len, u32 addr)
@ -267,8 +268,8 @@ static int mlxcpld_i2c_wait_for_free(struct mlxcpld_i2c_priv *priv)
do {
if (!mlxcpld_i2c_check_busy(priv))
break;
usleep_range(MLXCPLD_I2C_POLL_TIME / 2, MLXCPLD_I2C_POLL_TIME);
timeout += MLXCPLD_I2C_POLL_TIME;
usleep_range(priv->polling_time / 2, priv->polling_time);
timeout += priv->polling_time;
} while (timeout <= MLXCPLD_I2C_XFER_TO);
if (timeout > MLXCPLD_I2C_XFER_TO)
@ -288,10 +289,10 @@ static int mlxcpld_i2c_wait_for_tc(struct mlxcpld_i2c_priv *priv)
u8 datalen, val;
do {
usleep_range(MLXCPLD_I2C_POLL_TIME / 2, MLXCPLD_I2C_POLL_TIME);
usleep_range(priv->polling_time / 2, priv->polling_time);
if (!mlxcpld_i2c_check_status(priv, &status))
break;
timeout += MLXCPLD_I2C_POLL_TIME;
timeout += priv->polling_time;
} while (status == 0 && timeout < MLXCPLD_I2C_XFER_TO);
switch (status) {
@ -498,9 +499,11 @@ mlxcpld_i2c_set_frequency(struct mlxcpld_i2c_priv *priv,
switch ((regval & data->mask) >> data->bit) {
case MLXCPLD_I2C_FREQ_1000KHZ:
freq = MLXCPLD_I2C_FREQ_1000KHZ_SET;
priv->polling_time /= 4;
break;
case MLXCPLD_I2C_FREQ_400KHZ:
freq = MLXCPLD_I2C_FREQ_400KHZ_SET;
priv->polling_time /= 4;
break;
default:
return 0;
@ -527,6 +530,7 @@ static int mlxcpld_i2c_probe(struct platform_device *pdev)
priv->dev = &pdev->dev;
priv->base_addr = MLXPLAT_CPLD_LPC_I2C_BASE_ADDR;
priv->polling_time = MLXCPLD_I2C_POLL_TIME;
/* Set I2C bus frequency if platform data provides this info. */
pdata = dev_get_platdata(&pdev->dev);