drm/amdgpu: Force order between a read and write to the same address

Setting register to force ordering to prevent read/write or write/read
hazards for un-cached modes.
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c

@@ -89,6 +89,10 @@ MODULE_FIRMWARE("amdgpu/gc_11_5_0_me.bin");
 MODULE_FIRMWARE("amdgpu/gc_11_5_0_mec.bin");
 MODULE_FIRMWARE("amdgpu/gc_11_5_0_rlc.bin");
 
+static const struct soc15_reg_golden golden_settings_gc_11_0[] = {
+	SOC15_REG_GOLDEN_VALUE(GC, 0, regTCP_CNTL, 0x20000000, 0x20000000)
+};
+
 static const struct soc15_reg_golden golden_settings_gc_11_0_1[] =
 {
 	SOC15_REG_GOLDEN_VALUE(GC, 0, regCGTT_GS_NGG_CLK_CTRL, 0x9fff8fff, 0x00000010),
@@ -304,6 +308,10 @@ static void gfx_v11_0_init_golden_registers(struct amdgpu_device *adev)
 	default:
 		break;
 	}
+	soc15_program_register_sequence(adev,
+					golden_settings_gc_11_0,
+					(const u32)ARRAY_SIZE(golden_settings_gc_11_0));
+
 }
 
 static void gfx_v11_0_write_data_to_reg(struct amdgpu_ring *ring, int eng_sel,

drivers/gpu/drm/amd/include/asic_reg/gc/gc_11_0_0_offset.h

@@ -6369,6 +6369,8 @@
 #define regTCP_INVALIDATE_BASE_IDX                                                                      1
 #define regTCP_STATUS                                                                                   0x19a1
 #define regTCP_STATUS_BASE_IDX                                                                          1
+#define regTCP_CNTL                                                                                     0x19a2
+#define regTCP_CNTL_BASE_IDX                                                                            1
 #define regTCP_CNTL2                                                                                    0x19a3
 #define regTCP_CNTL2_BASE_IDX                                                                           1
 #define regTCP_DEBUG_INDEX                                                                              0x19a5