serial: sc16is7xx: fix broken port 0 uart init
[ Upstream commit 2861ed4d ] 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: dfeae619 ("serial: sc16is7xx") Cc: stable@vger.kernel.org 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> Link: https://lore.kernel.org/r/20230807214556.540627-2-hugo@hugovil.com Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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159bc8c6
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