Messages in this thread Patch in this message | | | From | Hugo Villeneuve <> | Date | Fri, 21 Jul 2023 12:18:31 -0400 | Subject | [RESEND PATCH v8 01/10] serial: sc16is7xx: fix broken port 0 uart init |
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From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
The sc16is7xx_config_rs485() function is called only for the second port (index 1, channel B), causing initialization problems for the first port.
For the sc16is7xx driver, port->membase and port->mapbase are not set, and their default values are 0. And we set port->iobase to the device index. This means that when the first device is registered using the uart_add_one_port() function, the following values will be in the port structure: port->membase = 0 port->mapbase = 0 port->iobase = 0
Therefore, the function uart_configure_port() in serial_core.c will exit early because of the following check: /* * If there isn't a port here, don't do anything further. */ if (!port->iobase && !port->mapbase && !port->membase) return;
Typically, I2C and SPI drivers do not set port->membase and port->mapbase.
The max310x driver sets port->membase to ~0 (all ones). By implementing the same change in this driver, uart_configure_port() is now correctly executed for all ports.
Fixes: dfeae619d781 ("serial: sc16is7xx") Cc: <stable@vger.kernel.org> # 6.1.x Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Lech Perczak <lech.perczak@camlingroup.com> Tested-by: Lech Perczak <lech.perczak@camlingroup.com> --- drivers/tty/serial/sc16is7xx.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 2e7e7c409cf2..8ae2afc76a9b 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1436,6 +1436,7 @@ static int sc16is7xx_probe(struct device *dev, s->p[i].port.fifosize = SC16IS7XX_FIFO_SIZE; s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY; s->p[i].port.iobase = i; + s->p[i].port.membase = (void __iomem *)~0; s->p[i].port.iotype = UPIO_PORT; s->p[i].port.uartclk = freq; s->p[i].port.rs485_config = sc16is7xx_config_rs485; -- 2.30.2
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