On Mon, 5 Jun 2023, Uwe Kleine-König wrote: > On Mon, Jun 05, 2023 at 04:22:55PM +0300, Ilpo Järvinen wrote: > > On Mon, 5 Jun 2023, Uwe Kleine-König wrote: > > > > > The need to handle the FSL variant of 8250 in a special way is also > > > present without console support. So soften the dependency for > > > SERIAL_8250_FSL accordingly. Note that with the 8250 driver compiled as > > > a module, some devices still might not make use of the needed > > > workarounds. That affects the ports instantiated in > > > arch/powerpc/kernel/legacy_serial.c. > > > > > > This issue was identified by Dominik Andreas Schorpp. > > > > > > To cope for CONFIG_SERIAL_8250=m + CONFIG_SERIAL_8250_FSL=y, 8250_fsl.o > > > must be put in the same compilation unit as 8250_port.o because the > > > latter defines some functions needed in the former and so 8250_fsl.o > > > must not be built-in if 8250_port.o is available in a module. > > > > > > Acked-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> > > > Link: https://lore.kernel.org/r/20230531083230.2702181-1-u.kleine-koenig@xxxxxxxxxxxxxx > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> > > > --- > > > drivers/tty/serial/8250/Kconfig | 2 +- > > > drivers/tty/serial/8250/Makefile | 2 +- > > > 2 files changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig > > > index 5313aa31930f..10c09b19c871 100644 > > > --- a/drivers/tty/serial/8250/Kconfig > > > +++ b/drivers/tty/serial/8250/Kconfig > > > @@ -378,7 +378,7 @@ config SERIAL_8250_BCM2835AUX > > > > > > config SERIAL_8250_FSL > > > bool "Freescale 16550 UART support" if COMPILE_TEST && !(PPC || ARM || ARM64) > > > - depends on SERIAL_8250_CONSOLE > > > + depends on SERIAL_8250 > > > > Just one additional thought: After the adding the arch side > > workaround/hack, SERIAL_8250_FSL could become a tristate? > > I see no benefit for a module separate from 8250_base.ko. There are > dependencies in both directions between 8250_port.o and 8250_fsl.o[1]. > So in my book a bool SERIAL_8250_FSL that modifies 8250_base.ko (with > SERIAL_8250=m) is fine. > > Best regards > Uwe > > [1] 8250_port.o uses fsl8250_handle_irq() from 8250_fsl.o Is that after some fix which isn't in tty-next? I see only these: $ git grep -l fsl8250_handle_irq arch/powerpc/kernel/legacy_serial.c drivers/tty/serial/8250/8250_fsl.c drivers/tty/serial/8250/8250_of.c include/linux/serial_8250.h No users of fsl8250_handle_irq in 8250_port.c. -- i. >, and 8250_fsl.o uses serial8250_modem_status from 8250_port.o.
