drm/amd/display: Only define DP 2.0 symbols if not already defined

[Why]
For some reason we're defining DP 2.0 definitions inside our
driver. Now that patches to introduce relevant definitions
are slated to be merged into drm-next this is causing conflicts.

In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c:33:
In file included from ./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:70:
In file included from ./drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu_mode.h:36:
./include/drm/drm_dp_helper.h:1322:9: error: 'DP_MAIN_LINK_CHANNEL_CODING_PHY_REPEATER' macro redefined [-Werror,-Wmacro-redefined]
        ^
./drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dp_types.h:881:9: note: previous definition is here
        ^
1 error generated.

[How]
Guard all display driver defines with #ifndef for now. Once we pull
in the new definitions into amd-staging-drm-next we will follow
up and drop definitions from our driver and provide follow-up
header updates for any addition DP 2.0 definitions required
by our driver.

We also ensure drm_dp_helper.h is included before dc_dp_types.h.

v3: Ensure drm_dp_helper.h is included before dc_dp_types.h

v2: Add one missing endif
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_dp_types.h

@@ -860,28 +860,72 @@ struct psr_caps {
 };
 
 #if defined(CONFIG_DRM_AMD_DC_DCN)
+#ifndef DP_MAIN_LINK_CHANNEL_CODING_CAP
 #define DP_MAIN_LINK_CHANNEL_CODING_CAP			0x006
+#endif
+#ifndef DP_SINK_VIDEO_FALLBACK_FORMATS
 #define DP_SINK_VIDEO_FALLBACK_FORMATS			0x020
+#endif
+#ifndef DP_FEC_CAPABILITY_1
 #define DP_FEC_CAPABILITY_1				0x091
+#endif
+#ifndef DP_DFP_CAPABILITY_EXTENSION_SUPPORT
 #define DP_DFP_CAPABILITY_EXTENSION_SUPPORT		0x0A3
+#endif
+#ifndef DP_DSC_CONFIGURATION
 #define DP_DSC_CONFIGURATION				0x161
+#endif
+#ifndef DP_PHY_SQUARE_PATTERN
 #define DP_PHY_SQUARE_PATTERN				0x249
+#endif
+#ifndef DP_128b_132b_SUPPORTED_LINK_RATES
 #define DP_128b_132b_SUPPORTED_LINK_RATES		0x2215
+#endif
+#ifndef DP_128b_132b_TRAINING_AUX_RD_INTERVAL
 #define DP_128b_132b_TRAINING_AUX_RD_INTERVAL		0x2216
+#endif
+#ifndef DP_TEST_264BIT_CUSTOM_PATTERN_7_0
 #define DP_TEST_264BIT_CUSTOM_PATTERN_7_0		0X2230
+#endif
+#ifndef DP_TEST_264BIT_CUSTOM_PATTERN_263_256
 #define DP_TEST_264BIT_CUSTOM_PATTERN_263_256		0X2250
+#endif
+#ifndef DP_DSC_SUPPORT_AND_DECODER_COUNT
 #define DP_DSC_SUPPORT_AND_DECODER_COUNT		0x2260
+#endif
+#ifndef DP_DSC_MAX_SLICE_COUNT_AND_AGGREGATION_0
 #define DP_DSC_MAX_SLICE_COUNT_AND_AGGREGATION_0	0x2270
-# define DP_DSC_DECODER_0_MAXIMUM_SLICE_COUNT_MASK	(1 << 0)
-# define DP_DSC_DECODER_0_AGGREGATION_SUPPORT_MASK	(0b111 << 1)
-# define DP_DSC_DECODER_0_AGGREGATION_SUPPORT_SHIFT	1
-# define DP_DSC_DECODER_COUNT_MASK			(0b111 << 5)
-# define DP_DSC_DECODER_COUNT_SHIFT			5
+#endif
+#ifndef DP_DSC_DECODER_0_MAXIMUM_SLICE_COUNT_MASK
+#define DP_DSC_DECODER_0_MAXIMUM_SLICE_COUNT_MASK	(1 << 0)
+#endif
+#ifndef DP_DSC_DECODER_0_AGGREGATION_SUPPORT_MASK
+#define DP_DSC_DECODER_0_AGGREGATION_SUPPORT_MASK	(0b111 << 1)
+#endif
+#ifndef DP_DSC_DECODER_0_AGGREGATION_SUPPORT_SHIFT
+#define DP_DSC_DECODER_0_AGGREGATION_SUPPORT_SHIFT	1
+#endif
+#ifndef DP_DSC_DECODER_COUNT_MASK
+#define DP_DSC_DECODER_COUNT_MASK			(0b111 << 5)
+#endif
+#ifndef DP_DSC_DECODER_COUNT_SHIFT
+#define DP_DSC_DECODER_COUNT_SHIFT			5
+#endif
+#ifndef DP_MAIN_LINK_CHANNEL_CODING_SET
 #define DP_MAIN_LINK_CHANNEL_CODING_SET			0x108
+#endif
+#ifndef DP_MAIN_LINK_CHANNEL_CODING_PHY_REPEATER
 #define DP_MAIN_LINK_CHANNEL_CODING_PHY_REPEATER	0xF0006
+#endif
+#ifndef DP_PHY_REPEATER_128b_132b_RATES
 #define DP_PHY_REPEATER_128b_132b_RATES			0xF0007
+#endif
+#ifndef DP_128b_132b_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1
 #define DP_128b_132b_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1	0xF0022
+#endif
+#ifndef DP_INTRA_HOP_AUX_REPLY_INDICATION
 #define DP_INTRA_HOP_AUX_REPLY_INDICATION		(1 << 3)
+#endif
 /* TODO - Use DRM header to replace above once available */
 
 union dp_main_line_channel_coding_cap {

drivers/gpu/drm/amd/display/dc/os_types.h

@@ -35,6 +35,7 @@
 #include <asm/byteorder.h>
 
 #include <drm/drm_print.h>
+#include <drm/drm_dp_helper.h>
 
 #include "cgs_common.h"