From: Cosmin Tanislav <cosmin.tanislav@xxxxxxxxxx> [ 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@xxxxxxxxx> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220605144659.4169853-2-demonsingur@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Stable-dep-of: b35f8dbbce81 ("serial: max310x: prevent infinite while() loop in port startup") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/tty/serial/max310x.c | 36 ++++++++---------------------------- 1 file changed, 8 insertions(+), 28 deletions(-) diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 5dd73d1da1ecc..c9032e300a586 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -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) @@ -1386,10 +1370,6 @@ 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); -- 2.43.0
