drm/radeon: Use direct mapping for fast fb access on RS780/RS880 (v2)
v2: fix trailing whitespace
Signed-off-by: Samuel Li <samuel.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 0f30d0d..0e53416 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1046,6 +1046,24 @@
return -1;
}
+uint32_t rs780_mc_rreg(struct radeon_device *rdev, uint32_t reg)
+{
+ uint32_t r;
+
+ WREG32(R_0028F8_MC_INDEX, S_0028F8_MC_IND_ADDR(reg));
+ r = RREG32(R_0028FC_MC_DATA);
+ WREG32(R_0028F8_MC_INDEX, ~C_0028F8_MC_IND_ADDR);
+ return r;
+}
+
+void rs780_mc_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v)
+{
+ WREG32(R_0028F8_MC_INDEX, S_0028F8_MC_IND_ADDR(reg) |
+ S_0028F8_MC_IND_WR_EN(1));
+ WREG32(R_0028FC_MC_DATA, v);
+ WREG32(R_0028F8_MC_INDEX, 0x7F);
+}
+
static void r600_mc_program(struct radeon_device *rdev)
{
struct rv515_mc_save save;
@@ -1181,6 +1199,8 @@
{
u32 tmp;
int chansize, numchan;
+ uint32_t h_addr, l_addr;
+ unsigned long long k8_addr;
/* Get VRAM informations */
rdev->mc.vram_is_ddr = true;
@@ -1221,7 +1241,30 @@
if (rdev->flags & RADEON_IS_IGP) {
rs690_pm_info(rdev);
rdev->mc.igp_sideport_enabled = radeon_atombios_sideport_present(rdev);
+
+ 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;
+ }
+ }
+ }
}
+
radeon_update_bandwidth_info(rdev);
return 0;
}