drm/amdgpu: correct umc poison mode set value

For GFX 11.0.3, Due to security policy, there is no way to check UcFatalEn
field of UMCCH0_0_GeccCtrl to identify UMC poison mode. This is workaround
force set umc poison mode as 1 for GFX 11.0.3
Signed-off-by: NStanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/umc_v8_10.c

@@ -340,29 +340,13 @@ static void umc_v8_10_err_cnt_init(struct amdgpu_device *adev)
 	}
 }
 
-static uint32_t umc_v8_10_query_ras_poison_mode_per_channel(
-						struct amdgpu_device *adev,
-						uint32_t umc_reg_offset)
-{
-	uint32_t ecc_ctrl_addr, ecc_ctrl;
-
-	ecc_ctrl_addr =
-		SOC15_REG_OFFSET(UMC, 0, regUMCCH0_0_GeccCtrl);
-	ecc_ctrl = RREG32_PCIE((ecc_ctrl_addr +
-					umc_reg_offset) * 4);
-
-	return REG_GET_FIELD(ecc_ctrl, UMCCH0_0_GeccCtrl, UCFatalEn);
-}
-
 static bool umc_v8_10_query_ras_poison_mode(struct amdgpu_device *adev)
 {
-	uint32_t umc_reg_offset  = 0;
-
-	/* Enabling fatal error in umc node0 instance0 channel0 will be
-	 * considered as fatal error mode
+	/*
+	 * Force return true, because UMCCH0_0_GeccCtrl
+	 * is not accessible from host side
 	 */
-	umc_reg_offset = get_umc_v8_10_reg_offset(adev, 0, 0, 0);
-	return !umc_v8_10_query_ras_poison_mode_per_channel(adev, umc_reg_offset);
+	return true;
 }
 
 const struct amdgpu_ras_block_hw_ops umc_v8_10_ras_hw_ops = {