drm/amdgpu/atomfirmware: fix parsing of vram_info

commit f6f49dda49db72e7a0b4ca32c77391d5ff5ce232 upstream.

v3.x changed the how vram width was encoded.  The previous
implementation actually worked correctly for most boards.
Fix the implementation to work correctly everywhere.

This fixes the vram width reported in the kernel log on
some boards.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
index c8c23dbb909165bb88adde7cada0f5200fc8b2bf..12b48851820e3724d54250529c505bb491a18b1d 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
@@ -399,7 +399,7 @@ amdgpu_atomfirmware_get_vram_info(struct amdgpu_device *adev,
                                        mem_channel_number = vram_info->v30.channel_num;
                                        mem_channel_width = vram_info->v30.channel_width;
                                        if (vram_width)
-                                               *vram_width = mem_channel_number * (1 << mem_channel_width);
+                                               *vram_width = mem_channel_number * 16;
                                        break;
                                default:
                                        return -EINVAL;