drm/radeon/kms: block RN50 from using 3D engine.

RN50/ES1000 is a cut-down rv100 chip used in the server market.
The 3D engine on these is either not there or unverified so refuse
any attempt to configure registers on it.
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/r100.c

@@ -973,6 +973,11 @@ static int r100_packet0_check(struct radeon_cs_parser *p,
 		case R300_TX_OFFSET_0+52:
 		case R300_TX_OFFSET_0+56:
 		case R300_TX_OFFSET_0+60:
+			/* rn50 has no 3D engine so fail on any 3d setup */
+			if (ASIC_IS_RN50(p->rdev)) {
+				DRM_ERROR("attempt to use RN50 3D engine failed\n");
+				return -EINVAL;
+			}
 			r = r100_cs_packet_next_reloc(p, &reloc);
 			if (r) {
 				DRM_ERROR("No reloc for ib[%d]=0x%04X\n",

drivers/gpu/drm/radeon/radeon.h

@@ -673,6 +673,8 @@ void r100_pll_errata_after_index(struct radeon_device *rdev);
 /*
  * ASICs helpers.
  */
+#define ASIC_IS_RN50(rdev) ((rdev->pdev->device == 0x515e) || \
+			    (rdev->pdev->device == 0x5969))
 #define ASIC_IS_RV100(rdev) ((rdev->family == CHIP_RV100) || \
 		(rdev->family == CHIP_RV200) || \
 		(rdev->family == CHIP_RS100) || \