linux-kernel - [PATCH v1] i2c: Force DLL0945 touchpad i2c freq to 100khz

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Message-ID: <20250802231554.9920-1-myth5@myth5.com>
Date: Sun,  3 Aug 2025 07:15:54 +0800
From: "fangzhong.zhou" <myth5@...h5.com>
To: wsa+renesas@...g-engineering.com
Cc: linux-acpi@...r.kernel.org,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	myth5@...h5.com,
	westeri@...nel.org
Subject: [PATCH v1] 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.

Changes in v1:
	- No code changes from first commit.

Signed-off-by: fangzhong.zhou <myth5@...h5.com>
---
 drivers/i2c/i2c-core-acpi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index d2499f302..5b424637b 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -371,6 +371,7 @@ static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = {
 	 * a 400KHz frequency. The root cause of the issue is not known.
 	 */
 	{ "ELAN06FA", 0 },
+	{ "DLL0945", 0 },
 	{}
 };
 
-- 
2.48.1