--- a3/sys/dev/drm/amd/display/dc/gpio/dce110/hw_translate_dce110.c	2026-09-25 12:29:46.894316155 +0000
+++ b3/sys/dev/drm/amd/display/dc/gpio/dce110/hw_translate_dce110.c	2026-09-25 12:29:46.910315948 +0000
@@ -212,6 +212,8 @@
 		break;
 		case GPIO_DDC_LINE_I2C_PAD:
 			info->offset = mmDC_GPIO_I2CPAD_A;
+			/* DC_GPIO_I2CPAD_A has no bit 8: SCL=bit0, SDA=bit1 */
+			info->mask = DC_GPIO_I2CPAD_A__DC_GPIO_SDA_A_MASK;
 		break;
 		default:
 			ASSERT_CRITICAL(false);