i2c: Force DLL0945 touchpad i2c freq to 100khz

This patch fixes an issue where the touchpad cursor movement becomes
slow on the Dell Precision 5560. Force the touchpad freq to 100khz
as a workaround.

Tested on Dell Precision 5560 with 6.14 to 6.14.6. Cursor movement
is now smooth and responsive.

Signed-off-by: fangzhong.zhou <myth5@myth5.com>
[wsa: kept sorting and removed unnecessary parts from commit msg]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 3445cc3b476be120d491ec7f04dcd1907b808221..ed90858a27b7b95733e772c9f2969a50c2d4a9c2 100644 (file)
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -370,6 +370,7 @@ static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
         * the device works without issues on Windows at what is expected to be
         * a 400KHz frequency. The root cause of the issue is not known.
         */
+       { "DLL0945", 0 },
        { "ELAN06FA", 0 },
        {}
 };