+
+ if (rdev->family == CHIP_RS780 || rdev->family == CHIP_RS880) {
+ /* Use K8 direct mapping for fast fb access. */
+ rdev->fastfb_working = false;
+ h_addr = G_000012_K8_ADDR_EXT(RREG32_MC(R_000012_MC_MISC_UMA_CNTL));
+ l_addr = RREG32_MC(R_000011_K8_FB_LOCATION);
+ k8_addr = ((unsigned long long)h_addr) << 32 | l_addr;
+#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
+ if (k8_addr + rdev->mc.visible_vram_size < 0x100000000ULL)
+#endif
+ {
+ /* FastFB shall be used with UMA memory. Here it is simply disabled when sideport
+ * memory is present.
+ */
+ if (rdev->mc.igp_sideport_enabled == false && radeon_fastfb == 1) {
+ DRM_INFO("Direct mapping: aper base at 0x%llx, replaced by direct mapping base 0x%llx.\n",
+ (unsigned long long)rdev->mc.aper_base, k8_addr);
+ rdev->mc.aper_base = (resource_size_t)k8_addr;
+ rdev->fastfb_working = true;
+ }
+ }
+ }