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i2c: Force DLL0945 touchpad i2c freq to 100khz

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[ Upstream commit 0b7c9528fa ]

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>
This commit is contained in:
fangzhong.zhou 2025-08-03 07:15:54 +08:00 committed by Greg Kroah-Hartman
parent 6614194456
commit ab0a2713fd
1 changed files with 1 additions and 0 deletions
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drivers/i2c/i2c-core-acpi.c
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@ -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 },
{}
};