FAILED: patch "[PATCH] drm/amdgpu: fix size calculation with stolen vga memory" failed to apply to 5.9-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 157fe68d74c2ad2db438c91af9ed3d3a51de4ed7 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 7 Dec 2020 13:12:29 -0500
Subject: [PATCH] drm/amdgpu: fix size calculation with stolen vga memory
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

If we need to keep the stolen vga memory, make sure it is
at least as big as the legacy vga size.

Acked-by: Christian König <christian.koenig@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_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index 36604d751d62..3e4892b7b7d3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -499,6 +499,9 @@ void amdgpu_gmc_get_vbios_allocations(struct amdgpu_device *adev)
 	else
 		size = amdgpu_gmc_get_vbios_fb_size(adev);
 
+	if (adev->mman.keep_stolen_vga_memory)
+		size = max(size, (unsigned)AMDGPU_VBIOS_VGA_ALLOCATION);
+
 	/* set to 0 if the pre-OS buffer uses up most of vram */
 	if ((adev->gmc.real_vram_size - size) < (8 * 1024 * 1024))
 		size = 0;