linux-kernel - Re: [PATCH v2] input/i8042: Add quirk table to disable aux port on Clevo NS70MU

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Date:   Thu, 10 Feb 2022 13:42:40 +0100
From:   Werner Sembach <wse@...edocomputers.com>
To:     dmitry.torokhov@...il.com, tiwai@...e.com, mpdesouza@...e.com,
        arnd@...db.de, samuel@...oj.net, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] input/i8042: Add quirk table to disable aux port on
 Clevo NS70MU

> At least one modern Clevo barebone has the touchpad connected both via PS/2
> and i2c interface. This causes a race condition between the psmouse and
> i2c-hid driver. Since the full capability if the touchpad is available via
> the i2c interface and the device has no external PS/2 port, it is save to
> just ignore all ps2 mouses here to avoid this issue.
>
> The know affected device is the Clevo NS70MU.
>
> This patch adds a new i8042_dmi_noaux_table with the dmi strings of the
> affected device of different revisions. The table is then evaluated like
> the other quirk tables in the i8042 driver.
>
> This is revision 2 as I got aware that there are yet another 2 dmi string
> combinations identifying the same device.
Please let me know if a patch like this could be accepted or if the i8042 quirk tables are in a freeze state and issues
like this should be fixed another way now?
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/input/serio/i8042-x86ia64io.h | 54 +++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
>
> diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
> index 148a7c5fd0e2..e39d3d840a31 100644
> --- a/drivers/input/serio/i8042-x86ia64io.h
> +++ b/drivers/input/serio/i8042-x86ia64io.h
> @@ -1013,6 +1013,57 @@ static const struct dmi_system_id i8042_dmi_probe_defer_table[] __initconst = {
>  	{ }
>  };
>  
> +static const struct dmi_system_id i8042_dmi_noaux_table[] __initconst = {
> +	/*
> +	 * At least one modern Clevo barebone has the touchpad connected
> +	 * both via PS/2 and i2c interface. This causes a race condition
> +	 * between the psmouse and i2c-hid driver. Since the full
> +	 * capability if the touchpad is available via the i2c interface
> +	 * and the device has no external PS/2 port, it is save to just
> +	 * ignore all ps2 mouses here to avoid this issue.
> +	 * The know affected device is the
> +	 * TUXEDO InfinityBook S17 Gen6 / Clevo NS70MU which comes with
> +	 * one of the 6 different dmi string combinations below.
> +	 */
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
> +			DMI_MATCH(DMI_BOARD_NAME, "NS50MU"),
> +		},
> +	},
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
> +			DMI_MATCH(DMI_BOARD_NAME, "NS50_70MU"),
> +		},
> +	},
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
> +			DMI_MATCH(DMI_BOARD_NAME, "NS50MU"),
> +		},
> +	},
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
> +			DMI_MATCH(DMI_BOARD_NAME, "NS50_70MU"),
> +		},
> +	},
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
> +			DMI_MATCH(DMI_BOARD_NAME, "NS50MU"),
> +		},
> +	},
> +	{
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
> +			DMI_MATCH(DMI_BOARD_NAME, "NS50_70MU"),
> +		},
> +	},
> +	{ }
> +};
> +
>  #endif /* CONFIG_X86 */
>  
>  #ifdef CONFIG_PNP
> @@ -1336,6 +1387,9 @@ static int __init i8042_platform_init(void)
>  	if (dmi_check_system(i8042_dmi_probe_defer_table))
>  		i8042_probe_defer = true;
>  
> +	if (dmi_check_system(i8042_dmi_noaux_table))
> +		i8042_noaux = true;
> +
>  	/*
>  	 * A20 was already enabled during early kernel init. But some buggy
>  	 * BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to