drm/radeon/kms: setup mc chremap properly on r7xx/evergreen

Should improve performance slightly and possibly fix some
issues.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -1382,6 +1382,42 @@ static u32 evergreen_get_tile_pipe_to_backend_map(struct radeon_device *rdev,
 	return backend_map;
 }
 
+static void evergreen_program_channel_remap(struct radeon_device *rdev)
+{
+	u32 tcp_chan_steer_lo, tcp_chan_steer_hi, mc_shared_chremap, tmp;
+
+	tmp = RREG32(MC_SHARED_CHMAP);
+	switch ((tmp & NOOFCHAN_MASK) >> NOOFCHAN_SHIFT) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+	default:
+		/* default mapping */
+		mc_shared_chremap = 0x00fac688;
+		break;
+	}
+
+	switch (rdev->family) {
+	case CHIP_HEMLOCK:
+	case CHIP_CYPRESS:
+		tcp_chan_steer_lo = 0x54763210;
+		tcp_chan_steer_hi = 0x0000ba98;
+		break;
+	case CHIP_JUNIPER:
+	case CHIP_REDWOOD:
+	case CHIP_CEDAR:
+	default:
+		tcp_chan_steer_lo = 0x76543210;
+		tcp_chan_steer_hi = 0x0000ba98;
+		break;
+	}
+
+	WREG32(TCP_CHAN_STEER_LO, tcp_chan_steer_lo);
+	WREG32(TCP_CHAN_STEER_HI, tcp_chan_steer_hi);
+	WREG32(MC_SHARED_CHREMAP, mc_shared_chremap);
+}
+
 static void evergreen_gpu_init(struct radeon_device *rdev)
 {
 	u32 cc_rb_backend_disable = 0;
@@ -1685,6 +1721,8 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 	WREG32(DMIF_ADDR_CONFIG, gb_addr_config);
 	WREG32(HDP_ADDR_CONFIG, gb_addr_config);
 
+	evergreen_program_channel_remap(rdev);
+
 	num_shader_engines = ((RREG32(GB_ADDR_CONFIG) & NUM_SHADER_ENGINES(3)) >> 12) + 1;
 	grbm_gfx_index = INSTANCE_BROADCAST_WRITES;
 

drivers/gpu/drm/radeon/evergreend.h

@@ -180,6 +180,7 @@
 #define MC_SHARED_CHMAP						0x2004
 #define		NOOFCHAN_SHIFT					12
 #define		NOOFCHAN_MASK					0x00003000
+#define MC_SHARED_CHREMAP					0x2008
 
 #define	MC_ARB_RAMCFG					0x2760
 #define		NOOFBANK_SHIFT					0
@@ -348,6 +349,9 @@
 #define		SYNC_WALKER					(1 << 25)
 #define		SYNC_ALIGNER					(1 << 26)
 
+#define	TCP_CHAN_STEER_LO				0x960c
+#define	TCP_CHAN_STEER_HI				0x9610
+
 #define	VGT_CACHE_INVALIDATION				0x88C4
 #define		CACHE_INVALIDATION(x)				((x) << 0)
 #define			VC_ONLY						0

drivers/gpu/drm/radeon/rv770.c

@@ -489,6 +489,49 @@ static u32 r700_get_tile_pipe_to_backend_map(struct radeon_device *rdev,
 	return backend_map;
 }
 
+static void rv770_program_channel_remap(struct radeon_device *rdev)
+{
+	u32 tcp_chan_steer, mc_shared_chremap, tmp;
+	bool force_no_swizzle;
+
+	switch (rdev->family) {
+	case CHIP_RV770:
+	case CHIP_RV730:
+		force_no_swizzle = false;
+		break;
+	case CHIP_RV710:
+	case CHIP_RV740:
+	default:
+		force_no_swizzle = true;
+		break;
+	}
+
+	tmp = RREG32(MC_SHARED_CHMAP);
+	switch ((tmp & NOOFCHAN_MASK) >> NOOFCHAN_SHIFT) {
+	case 0:
+	case 1:
+	default:
+		/* default mapping */
+		mc_shared_chremap = 0x00fac688;
+		break;
+	case 2:
+	case 3:
+		if (force_no_swizzle)
+			mc_shared_chremap = 0x00fac688;
+		else
+			mc_shared_chremap = 0x00bbc298;
+		break;
+	}
+
+	if (rdev->family == CHIP_RV740)
+		tcp_chan_steer = 0x00ef2a60;
+	else
+		tcp_chan_steer = 0x00fac688;
+
+	WREG32(TCP_CHAN_STEER, tcp_chan_steer);
+	WREG32(MC_SHARED_CHREMAP, mc_shared_chremap);
+}
+
 static void rv770_gpu_init(struct radeon_device *rdev)
 {
 	int i, j, num_qd_pipes;
@@ -688,6 +731,8 @@ static void rv770_gpu_init(struct radeon_device *rdev)
 	WREG32(DCP_TILING_CONFIG, (gb_tiling_config & 0xffff));
 	WREG32(HDP_TILING_CONFIG, (gb_tiling_config & 0xffff));
 
+	rv770_program_channel_remap(rdev);
+
 	WREG32(CC_RB_BACKEND_DISABLE,      cc_rb_backend_disable);
 	WREG32(CC_GC_SHADER_PIPE_CONFIG,   cc_gc_shader_pipe_config);
 	WREG32(GC_USER_SHADER_PIPE_CONFIG, cc_gc_shader_pipe_config);

drivers/gpu/drm/radeon/rv770d.h

@@ -138,6 +138,7 @@
 #define MC_SHARED_CHMAP						0x2004
 #define		NOOFCHAN_SHIFT					12
 #define		NOOFCHAN_MASK					0x00003000
+#define MC_SHARED_CHREMAP					0x2008
 
 #define	MC_ARB_RAMCFG					0x2760
 #define		NOOFBANK_SHIFT					0
@@ -303,6 +304,7 @@
 #define		BILINEAR_PRECISION_8_BIT			(1 << 31)
 
 #define	TCP_CNTL					0x9610
+#define	TCP_CHAN_STEER					0x9614
 
 #define	VGT_CACHE_INVALIDATION				0x88C4
 #define		CACHE_INVALIDATION(x)				((x)<<0)