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Date: Thu, 31 Mar 2022 08:12:00 +0100 (BST) From: "Maciej W. Rozycki" <macro@...am.me.uk> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> cc: Jiri Slaby <jirislaby@...nel.org>, Andy Shevchenko <andy.shevchenko@...il.com>, linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 2/2] serial: 8250: Report which option to enable for blacklisted PCI devices On Sun, 27 Feb 2022, Maciej W. Rozycki wrote: > > > We don't do this for any other driver subsystem, so why is it really > > > needed? What is so special about this driver that distros can't > > > just enable all of the drivers and all is good? What is keeping those > > > drivers fromb eing enabled? > > > > My justification is we have a supposedly generic PCI 8250 UART driver, > > except it explicitly and silently refuses to handle a handful of devices > > chosen by their PCI IDs based on that they may have extra features, even > > though they are otherwise fully compatible with a generic 8250. > > Actually as it happens we do have a precedent too, as here's what I have > just spotted on my laptop by chance when hibernating: > > 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. > > (with a distribution kernel, so clearly whoever packaged that has not > enabled what might be needed). Someone else wanted to be helpful too as > it seems. I have now posted v3 with these clarifications included in the change descriptions. Please review. Maciej
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