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serial: max310x: use regmap methods for SPI batch operations

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[ Upstream commit 285e76fc049c4d32c772eea9460a7ef28a193802 ]

The SPI batch read/write operations can be implemented as simple
regmap raw read and write, which will also try to do a gather
write just as it is done here.

Use the regmap raw read and write methods.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Link: https://lore.kernel.org/r/20220605144659.4169853-2-demonsingur@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: b35f8dbbce81 ("serial: max310x: prevent infinite while() loop in port startup")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cosmin Tanislav 2022-06-05 17:46:56 +03:00 committed by Sasha Levin
parent 32e32ab1da
commit c1ecaadbcd
1 changed files with 8 additions and 28 deletions
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36
drivers/tty/serial/max310x.c
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@ -263,8 +263,6 @@ struct max310x_one {
struct work_struct md_work;
struct work_struct rs_work;
u8 wr_header;
u8 rd_header;
u8 rx_buf[MAX310X_FIFO_SIZE];
};
#define to_max310x_port(_port) \
@ -635,32 +633,18 @@ static s32 max310x_set_ref_clk(struct device *dev, struct max310x_port *s,
static void max310x_batch_write(struct uart_port *port, u8 *txbuf, unsigned int len)
{
struct max310x_one *one = to_max310x_port(port);
struct spi_transfer xfer[] = {
{
.tx_buf = &one->wr_header,
.len = sizeof(one->wr_header),
}, {
.tx_buf = txbuf,
.len = len,
}
};
spi_sync_transfer(to_spi_device(port->dev), xfer, ARRAY_SIZE(xfer));
struct max310x_port *s = dev_get_drvdata(port->dev);
u8 reg = port->iobase + MAX310X_THR_REG;
regmap_raw_write(s->regmap, reg, txbuf, len);
}
static void max310x_batch_read(struct uart_port *port, u8 *rxbuf, unsigned int len)
{
struct max310x_one *one = to_max310x_port(port);
struct spi_transfer xfer[] = {
{
.tx_buf = &one->rd_header,
.len = sizeof(one->rd_header),
}, {
.rx_buf = rxbuf,
.len = len,
}
};
spi_sync_transfer(to_spi_device(port->dev), xfer, ARRAY_SIZE(xfer));
struct max310x_port *s = dev_get_drvdata(port->dev);
u8 reg = port->iobase + MAX310X_RHR_REG;
regmap_raw_read(s->regmap, reg, rxbuf, len);
}
static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen)
@ -1390,10 +1374,6 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
INIT_WORK(&s->p[i].md_work, max310x_md_proc);
/* Initialize queue for changing RS485 mode */
INIT_WORK(&s->p[i].rs_work, max310x_rs_proc);
/* Initialize SPI-transfer buffers */
s->p[i].wr_header = (s->p[i].port.iobase + MAX310X_THR_REG) |
MAX310X_WRITE_BIT;
s->p[i].rd_header = (s->p[i].port.iobase + MAX310X_RHR_REG);
/* Register port */
ret = uart_add_one_port(&max310x_uart, &s->p[i].port);