linux-kernel - Re: [RFC PATCH] usb: typec: ucsi

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Message-ID: <5fh2v2dcjjcgg3qgvbhlsf24kfigzzbv3sq5ykjuwyjodbqzsa@kf7crcyswm5y>
Date: Thu, 9 May 2024 16:27:41 +0100
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org, 
	lk@...e.de, u.kleine-koenig@...gutronix.de, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] usb: typec: ucsi_acpi: Add LG Gram quirk

On Thu, May 09, 2024 at 12:50:36PM GMT, Diogo Ivo wrote:
> Some LG Gram laptops report a bogus connector change event after a
> GET_PDOS command for the partner's source PDOs, which disappears from
> the CCI after acknowledging the command. However, the subsequent
> GET_CONNECTOR_STATUS in ucsi_handle_connector_change() still reports
> this bogus change in bits 5 and 6, leading to the UCSI core re-checking
> the partner's source PDOs and thus to an infinite loop.
> 
> Fix this by adding a quirk that signals when a potentially buggy GET_PDOS
> command is used, checks the status change report and clears it if it is a
> bogus event before sending it to the UCSI core.
> 
> [Sending as RFC both to see if this is a good idea and so that more
> users can test it to gather all the models affected by this bug.]
> 
> Signed-off-by: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
> ---

I just realized that I should be using the {set, test, clear}_bit()
functions in the patch I sent, sorry for that. With this in mind it
would still be good to hear what you think about it.

Best regards,
Diogo