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

[Hans de Goede]

Hi Yajat,

On 11-Jan-26 22:30, Hans de Goede wrote:
> 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@xxxxxxxxx>
> 
> 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 ?

Can you please confirm if the attached patch works, or at
a minimum check if the touchscreen is listed as i2c-GDIX1001:*
or i2c-GDIX1002:* under /sys/bus/i2c/devices ?

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) {
From 43aae0a5451031943836516ff541c9ab1232e6b9 Mon Sep 17 00:00:00 2001
From: Hans de Goede <johannes.goede@xxxxxxxxxxxxxxxx>
Date: Sun, 11 Jan 2026 22:25:58 +0100
Subject: [PATCH] platform/x86: touchscreen_dmi: Add quirk for y-inverted
 Goodix touchscreen on SUPI S10

The touchscreen on the SUPI S10 tablet reports inverted Y coordinates,
causing touch input to be mirrored vertically relative to the display.

Add a quirk to set the "touchscreen-inverted-y" boolean device-property
on the touchscreen device, so that the goodix_ts driver will fixup
the coordinates.

Reported-by: Yajat Kumar <yajatapps3@xxxxxxxxx>
Closes: https://lore.kernel.org/linux-input/20251230221639.582406-1-yajatapps3@xxxxxxxxx/
Signed-off-by: Hans de Goede <johannes.goede@xxxxxxxxxxxxxxxx>
---
 drivers/platform/x86/touchscreen_dmi.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/platform/x86/touchscreen_dmi.c b/drivers/platform/x86/touchscreen_dmi.c
index bdc19cd8d3ed..d83c387821ea 100644
--- a/drivers/platform/x86/touchscreen_dmi.c
+++ b/drivers/platform/x86/touchscreen_dmi.c
@@ -410,6 +410,16 @@ static const struct ts_dmi_data gdix1002_upside_down_data = {
 	.properties	= gdix1001_upside_down_props,
 };
 
+static const struct property_entry gdix1001_y_inverted_props[] = {
+	PROPERTY_ENTRY_BOOL("touchscreen-inverted-y"),
+	{ }
+};
+
+static const struct ts_dmi_data gdix1001_y_inverted_data = {
+	.acpi_name	= "GDIX1001",
+	.properties	= gdix1001_y_inverted_props,
+};
+
 static const struct property_entry gp_electronic_t701_props[] = {
 	PROPERTY_ENTRY_U32("touchscreen-size-x", 960),
 	PROPERTY_ENTRY_U32("touchscreen-size-y", 640),
@@ -1658,6 +1668,14 @@ const struct dmi_system_id touchscreen_dmi_table[] = {
 			DMI_MATCH(DMI_PRODUCT_SKU, "PN20170413488"),
 		},
 	},
+	{
+		/* SUPI S10 */
+		.driver_data = (void *)&gdix1001_y_inverted_data,
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "SUPI"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "S10"),
+		},
+	},
 	{
 		/* Techbite Arc 11.6 */
 		.driver_data = (void *)&techbite_arc_11_6_data,
-- 
2.52.0