[PATCH] drm/amdgpu: Use SKU instead of DID for FRU check

[Kent Russell]

The VG20 DIDs 66a0, 66a1 and 66a4 are used for various SKUs that may or may
not have the FRU EEPROM on it. Parse the VBIOS to check for server SKU
variants (D131 or D134) until a more general solution can be determined.

Signed-off-by: Kent Russell <kent.russell at amd.com>
---
 .../gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c    | 37 +++++++++++++------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
index e811fecc540f..82207b758800 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
@@ -34,18 +34,33 @@
 
 static bool is_fru_eeprom_supported(struct amdgpu_device *adev)
 {
-	/* TODO: Gaming SKUs don't have the FRU EEPROM.
-	 * Use this hack to address hangs on modprobe on gaming SKUs
-	 * until a proper solution can be implemented by only supporting
-	 * the explicit chip IDs for VG20 Server cards
-	 *
-	 * TODO: Add list of supported Arcturus DIDs once confirmed
+	/* TODO: See if we can figure this out dynamically instead of
+	 * having to parse VBIOS versions.
 	 */
-	if ((adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a0) ||
-	    (adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a1) ||
-	    (adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a4))
-		return true;
-	return false;
+	struct atom_context *atom_ctx = adev->mode_info.atom_context;
+	char model[3];
+	int modelnum;
+
+	/* VBIOS is of the format ###-DXXXXYY-XX. We only want the first
+	 * 3 digits after the D, and if we convert it to a hex integer,
+	 * we can use switch for ease/speed/readability and potential
+	 * expandability if required
+	 */
+	strncpy(model, atom_ctx->vbios_version + 5, 3);
+	modelnum = strtoul(model, NULL, 16);
+	switch (adev->asic_type) {
+	case CHIP_VEGA20:
+		switch (modelnum) {
+		/* These are the server VG20 SKUs */
+		case 0x161:
+		case 0x163:
+			return true;
+		default:
+			return false;
+		}
+	default:
+		return false;
+	}
 }
 
 static int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr,
-- 
2.17.1