From: Xiangliang Yu <Xiangliang.Yu@amd.com>
Date: Fri, 9 Jun 2017 09:12:02 +0000 (+0800)
Subject: drm/amdgpu: reduce the time of reading VBIOS
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f31c94d1de618064d5212462363f570a42ab39df;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

drm/amdgpu: reduce the time of reading VBIOS

VRAM is usually marked write combined, so change ioremap mode from
noncache to write combine for reading vbios from VRAM.

This will reduce cost time of reading vbios from 188ms to 8ms.

Signed-off-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
index ea3a2501c7cd..c21adf60a7f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
@@ -104,7 +104,7 @@ static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
 
 	adev->bios = NULL;
 	vram_base = pci_resource_start(adev->pdev, 0);
-	bios = ioremap(vram_base, size);
+	bios = ioremap_wc(vram_base, size);
 	if (!bios) {
 		return false;
 	}