linux-kernel - Re: [PATCH] Input: goodix - fix inverted Y coordinate on SUPI S10

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Message-ID: <fa17c5bb-9ab9-46f7-86fb-c06e09617279@kernel.org>
Date: Sun, 11 Jan 2026 22:30:14 +0100
From: Hans de Goede <hansg@...nel.org>
To: Yajat Kumar <yajatapps3@...il.com>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>,
 "open list:GOODIX TOUCHSCREEN" <linux-input@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Input: goodix - fix inverted Y coordinate on SUPI S10

Hi Yajat,

On 30-Dec-25 23:16, Yajat Kumar wrote:
> The touchscreen on the SUPI S10 reports inverted Y coordinates, causing
> touch input to be mirrored vertically relative to the display.
> 
> Add a DMI-based quirk to invert the Y coordinate on this device so that
> touch input matches the display orientation.
> 
> Tested on SUPI S10 tablet with Goodix touchscreen controller.
> 
> Signed-off-by: Yajat Kumar <yajatapps3@...il.com>

Thank you for your patch. This kind of quirks really belong
in drivers/platform/x86/touchscreen_dmi.c instead of in individual
touchscreen drivers.

The inverted_x_screen[] DMI quirk is a left-over from before we
moved these quirks to touchscreen_dmi.c and unfortunately we cannot
move this because we've not been able to find someone to test this.

I've attached a patch which should fix the issue using
touchscreen_dmi.c . Note you may need to change the GDIX1001 in
the patch to GDIX1002, see "ls /sys/bus/i2c/devices" to see which
ACPI HID your touchscreen is using.

Can you please test the attached patch ?

Regards,

Hans



> ---
>  drivers/input/touchscreen/goodix.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
> index f8798d11ec03..d675a85a9312 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -160,6 +160,22 @@ static const struct dmi_system_id inverted_x_screen[] = {
>  	{}
>  };
>  
> +/*
> + * Those tablets have their y coordinate inverted
> + */
> +static const struct dmi_system_id inverted_y_screen[] = {
> +#if defined(CONFIG_DMI) && defined(CONFIG_X86)
> +	{
> +		.ident = "SUPI S10",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "SUPI"),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "S10")
> +		},
> +	},
> +#endif
> +	{}
> +};
> +
>  /**
>   * goodix_i2c_read - read data from a register of the i2c slave device.
>   *
> @@ -1212,6 +1228,12 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
>  			"Applying 'inverted x screen' quirk\n");
>  	}
>  
> +	if (dmi_check_system(inverted_y_screen)) {
> +		ts->prop.invert_y = true;
> +		dev_dbg(&ts->client->dev,
> +			"Applying 'inverted y screen' quirk\n");
> +	}
> +
>  	error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
>  				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
>  	if (error) {

View attachment "0001-platform-x86-touchscreen_dmi-Add-quirk-for-y-inverte.patch" of type "text/x-patch" (2074 bytes)