serial: 8250: Report which option to enable for blacklisted PCI devices

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Provide information in the kernel log as to what configuration option to
enable for PCI UART devices that have been blacklisted in the generic
PCI 8250 UART driver and which have a dedicated driver available to
handle that has been disabled.  The rationale is there is no easy way
for the user to map a specific PCI vendor:device pair to an individual
dedicated driver while the generic driver has this information readily
available and it will likely be confusing that the generic driver does
not register such a port.

This is unlike usual drivers, such as drivers/net/ethernet/3com/3c59x.c
which handles all the hardware family members regardless of differences
between them, and following an existing example where a serio driver
provides suggestions as to the correct configuration options to use:

psmouse serio1: synaptics: The touchpad can support a better bus than the too old PS/2 protocol. Make sure MOUSE_PS2_SYNAPTICS_SMBUS and RMI4_SMB are enabled to get a better touchpad experience.

A message is then printed like:

serial 0000:04:00.3: ignoring port, enable SERIAL_8250_PERICOM to handle

when an affected device is encountered and the generic driver rejects it.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2203310054120.44113@angie.orcam.me.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Maciej W. Rozycki 2022-03-31 08:11:33 +01:00 • committed by Greg Kroah-Hartman

parent 65a8b28702

commit e0239ba3ff

1 changed files with 40 additions and 27 deletions

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drivers/tty/serial/8250/8250_pci.c

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