i2c: Force DLL0945 touchpad i2c freq to 100khz

[ Upstream commit 0b7c9528facdb5a73ad78fea86d2e95a6c48dbc4 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index d2499f302b50833592de6de91eb27f19327f5412..f43067f6797e94b2d87d60e878fe1597891ebbe3 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 },
        {}
 };