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serial: 8250: allow disabling of Freescale 16550 compile test

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The SERIAL_8250_FSL option is used to enable a workaround for a
break-detection erratum for Freescale 16550 UARTs in the 8250 driver and
is currently also used to enable support for ACPI enumeration.

It is enabled on PPC, ARM and ARM64 whenever 8250 console support is
enabled (since the quirk is needed for sysrq handling).

Commit b1442c55ce ("serial: 8250: extend compile-test coverage")
enabled compile testing of the code in question but did not provide a
means to disable the option when COMPILE_TEST is enabled.

Add a conditional input prompt instead so that SERIAL_8250_FSL is no
longer enabled by default when compile testing while continuing to
always enable the quirk for platforms that may need it.

Fixes: b1442c55ce ("serial: 8250: extend compile-test coverage")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210924141232.4419-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-09-24 16:12:32 +02:00 committed by Greg Kroah-Hartman
parent 5816b3e657
commit cb2282213e
1 changed files with 6 additions and 2 deletions
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8
drivers/tty/serial/8250/Kconfig
View File

@ -361,9 +361,13 @@ config SERIAL_8250_BCM2835AUX
If unsure, say N.
config SERIAL_8250_FSL
bool
bool "Freescale 16550 UART support" if COMPILE_TEST && !(PPC || ARM || ARM64)
depends on SERIAL_8250_CONSOLE
default PPC || ARM || ARM64 || COMPILE_TEST
default PPC || ARM || ARM64
help
Selecting this option enables a workaround for a break-detection
erratum for Freescale 16550 UARTs in the 8250 driver. It also
enables support for ACPI enumeration.
config SERIAL_8250_DW
tristate "Support for Synopsys DesignWare 8250 quirks"