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 Content-Type: text/plain; charset=UTF-8 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;