From: Rex Zhu <Rex.Zhu@amd.com>
Date: Tue, 27 Feb 2018 10:20:53 +0000 (+0800)
Subject: drm/amdgpu: Notify sbios device ready before send request
X-Git-Tag: v4.16-rc5~21^2^2~29
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=1bced75f4ab04bec55aecb57d99435dc6d0ae5a0;p=users%2Fjedix%2Flinux-maple.git

drm/amdgpu: Notify sbios device ready before send request

it is required if a platform supports PCIe root complex
core voltage reduction. After receiving this notification,
SBIOS can apply default PCIe root complex power policy.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 57afad79f55d..8fa850a070e0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -540,6 +540,9 @@ int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 	size_t size;
 	u32 retry = 3;
 
+	if (amdgpu_acpi_pcie_notify_device_ready(adev))
+		return -EINVAL;
+
 	/* Get the device handle */
 	handle = ACPI_HANDLE(&adev->pdev->dev);
 	if (!handle)