drm/amdgpu/gmc9: get vram width from atom for Raven

Get it from the system info table.
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -23,6 +23,7 @@
 #include <linux/firmware.h>
 #include "amdgpu.h"
 #include "gmc_v9_0.h"
+#include "amdgpu_atomfirmware.h"
 
 #include "vega10/soc15ip.h"
 #include "vega10/HDP/hdp_4_0_offset.h"
@@ -442,6 +443,8 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
 	u32 tmp;
 	int chansize, numchan;
 
+	adev->mc.vram_width = amdgpu_atomfirmware_get_vram_width(adev);
+	if (!adev->mc.vram_width) {
 		/* hbm memory channel size */
 		chansize = 128;
 
@@ -479,6 +482,7 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
 			break;
 		}
 		adev->mc.vram_width = numchan * chansize;
+	}
 
 	/* Could aper size report 0 ? */
 	adev->mc.aper_base = pci_resource_start(adev->pdev, 0);