drm/amd/display: Enable Freesync over PCon

[why]
Enable Freesync over PCon on Linux environment.

[how]
Adding Freesync over PCon support in amdgpu_dm
- Read DPCD for Freesync over PCon capabilitiy
- Add whitelist for compatible branch devices

Reviewed-by: Chao-kai Wang <[e-mail]>
Acked-by: Alex Hung <[e-mail]>
Signed-off-by: Sung Joon Kim <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

···
 
 #include "modules/inc/mod_freesync.h"
 #include "modules/power/power_helpers.h"
-#include "modules/inc/mod_info_packet.h"
 
 #define FIRMWARE_RENOIR_DMUB "amdgpu/renoir_dmcub.bin"
 MODULE_FIRMWARE(FIRMWARE_RENOIR_DMUB);
···
 	aconnector->base.dpms = DRM_MODE_DPMS_OFF;
 	aconnector->hpd.hpd = AMDGPU_HPD_NONE; /* not used */
 	aconnector->audio_inst = -1;
+	aconnector->pack_sdp_v1_3 = false;
+	aconnector->as_type = ADAPTIVE_SYNC_TYPE_NONE;
+	memset(&aconnector->vsdb_info, 0, sizeof(aconnector->vsdb_info));
 	mutex_init(&aconnector->hpd_lock);
 
 	/*
···
 	struct amdgpu_crtc *acrtc = to_amdgpu_crtc(new_crtc_state->base.crtc);
 	unsigned long flags;
 	bool pack_sdp_v1_3 = false;
+	struct amdgpu_dm_connector *aconn;
+	enum vrr_packet_type packet_type = PACKET_TYPE_VRR;
 
 	if (!new_stream)
 		return;
···
 		}
 	}
 
+	aconn = (struct amdgpu_dm_connector *)new_stream->dm_stream_context;
+
+	if (aconn && aconn->as_type == FREESYNC_TYPE_PCON_IN_WHITELIST) {
+		pack_sdp_v1_3 = aconn->pack_sdp_v1_3;
+
+		if (aconn->vsdb_info.amd_vsdb_version == 1)
+			packet_type = PACKET_TYPE_FS_V1;
+		else if (aconn->vsdb_info.amd_vsdb_version == 2)
+			packet_type = PACKET_TYPE_FS_V2;
+		else if (aconn->vsdb_info.amd_vsdb_version == 3)
+			packet_type = PACKET_TYPE_FS_V3;
+
+		mod_build_adaptive_sync_infopacket(new_stream, aconn->as_type, NULL,
+					&new_stream->adaptive_sync_infopacket);
+	}
+
 	mod_freesync_build_vrr_infopacket(
 		dm->freesync_module,
 		new_stream,
 		&vrr_params,
-		PACKET_TYPE_VRR,
+		packet_type,
 		TRANSFER_FUNC_UNKNOWN,
 		&vrr_infopacket,
 		pack_sdp_v1_3);
···
 	struct amdgpu_device *adev = drm_to_adev(dev);
 	struct amdgpu_hdmi_vsdb_info vsdb_info = {0};
 	bool freesync_capable = false;
+	enum adaptive_sync_type as_type = ADAPTIVE_SYNC_TYPE_NONE;
 
 	if (!connector->state) {
 		DRM_ERROR("%s - Connector has no state", __func__);
···
 		if (i >= 0 && vsdb_info.freesync_supported) {
 			timing  = &edid->detailed_timings[i];
 			data    = &timing->data.other_data;
+
+			amdgpu_dm_connector->min_vfreq = vsdb_info.min_refresh_rate_hz;
+			amdgpu_dm_connector->max_vfreq = vsdb_info.max_refresh_rate_hz;
+			if (amdgpu_dm_connector->max_vfreq - amdgpu_dm_connector->min_vfreq > 10)
+				freesync_capable = true;
+
+			connector->display_info.monitor_range.min_vfreq = vsdb_info.min_refresh_rate_hz;
+			connector->display_info.monitor_range.max_vfreq = vsdb_info.max_refresh_rate_hz;
+		}
+	}
+
+	as_type = dm_get_adaptive_sync_support_type(amdgpu_dm_connector->dc_link);
+
+	if (as_type == FREESYNC_TYPE_PCON_IN_WHITELIST) {
+		i = parse_hdmi_amd_vsdb(amdgpu_dm_connector, edid, &vsdb_info);
+		if (i >= 0 && vsdb_info.freesync_supported && vsdb_info.amd_vsdb_version > 0) {
+
+			amdgpu_dm_connector->pack_sdp_v1_3 = true;
+			amdgpu_dm_connector->as_type = as_type;
+			amdgpu_dm_connector->vsdb_info = vsdb_info;
 
 			amdgpu_dm_connector->min_vfreq = vsdb_info.min_refresh_rate_hz;
 			amdgpu_dm_connector->max_vfreq = vsdb_info.max_refresh_rate_hz;

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

···
 #include "irq_types.h"
 #include "signal_types.h"
 #include "amdgpu_dm_crc.h"
+#include "mod_info_packet.h"
 struct aux_payload;
 struct set_config_cmd_payload;
 enum aux_return_code_type;
···
 	MST_CLEAR_ALLOCATED_PAYLOAD = BIT(3),
 };
 
+/**
+ * struct amdgpu_hdmi_vsdb_info - Keep track of the VSDB info
+ *
+ * AMDGPU supports FreeSync over HDMI by using the VSDB section, and this
+ * struct is useful to keep track of the display-specific information about
+ * FreeSync.
+ */
+struct amdgpu_hdmi_vsdb_info {
+	/**
+	 * @amd_vsdb_version: Vendor Specific Data Block Version, should be
+	 * used to determine which Vendor Specific InfoFrame (VSIF) to send.
+	 */
+	unsigned int amd_vsdb_version;
+
+	/**
+	 * @freesync_supported: FreeSync Supported.
+	 */
+	bool freesync_supported;
+
+	/**
+	 * @min_refresh_rate_hz: FreeSync Minimum Refresh Rate in Hz.
+	 */
+	unsigned int min_refresh_rate_hz;
+
+	/**
+	 * @max_refresh_rate_hz: FreeSync Maximum Refresh Rate in Hz
+	 */
+	unsigned int max_refresh_rate_hz;
+};
+
 struct amdgpu_dm_connector {
 
 	struct drm_connector base;
···
 	/* Automated testing */
 	bool timing_changed;
 	struct dc_crtc_timing *timing_requested;
+
+	/* Adaptive Sync */
+	bool pack_sdp_v1_3;
+	enum adaptive_sync_type as_type;
+	struct amdgpu_hdmi_vsdb_info vsdb_info;
 };
 
 static inline void amdgpu_dm_set_mst_status(uint8_t *status,
···
 	int vcpi_slots;
 	uint64_t pbn;
 };
-
-/**
- * struct amdgpu_hdmi_vsdb_info - Keep track of the VSDB info
- *
- * AMDGPU supports FreeSync over HDMI by using the VSDB section, and this
- * struct is useful to keep track of the display-specific information about
- * FreeSync.
- */
-struct amdgpu_hdmi_vsdb_info {
-	/**
-	 * @amd_vsdb_version: Vendor Specific Data Block Version, should be
-	 * used to determine which Vendor Specific InfoFrame (VSIF) to send.
-	 */
-	unsigned int amd_vsdb_version;
-
-	/**
-	 * @freesync_supported: FreeSync Supported.
-	 */
-	bool freesync_supported;
-
-	/**
-	 * @min_refresh_rate_hz: FreeSync Minimum Refresh Rate in Hz.
-	 */
-	unsigned int min_refresh_rate_hz;
-
-	/**
-	 * @max_refresh_rate_hz: FreeSync Maximum Refresh Rate in Hz
-	 */
-	unsigned int max_refresh_rate_hz;
-};
-
 
 #define to_dm_connector_state(x)\
 	container_of((x), struct dm_connector_state, base)

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

···
 	// TODO
 }
 
+static bool dm_is_freesync_pcon_whitelist(const uint32_t branch_dev_id)
+{
+	bool ret_val = false;
+
+	switch (branch_dev_id) {
+	case DP_BRANCH_DEVICE_ID_0060AD:
+		ret_val = true;
+		break;
+	default:
+		break;
+	}
+
+	return ret_val;
+}
+
+enum adaptive_sync_type dm_get_adaptive_sync_support_type(struct dc_link *link)
+{
+	struct dpcd_caps *dpcd_caps = &link->dpcd_caps;
+	enum adaptive_sync_type as_type = ADAPTIVE_SYNC_TYPE_NONE;
+
+	switch (dpcd_caps->dongle_type) {
+	case DISPLAY_DONGLE_DP_HDMI_CONVERTER:
+		if (dpcd_caps->adaptive_sync_caps.dp_adap_sync_caps.bits.ADAPTIVE_SYNC_SDP_SUPPORT == true &&
+			dpcd_caps->allow_invalid_MSA_timing_param == true &&
+			dm_is_freesync_pcon_whitelist(dpcd_caps->branch_dev_id))
+			as_type = FREESYNC_TYPE_PCON_IN_WHITELIST;
+		break;
+	default:
+		break;
+	}
+
+	return as_type;
+}

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

···
 		const struct dc_link *link,
 		struct set_config_cmd_payload *payload,
 		enum set_config_status *operation_result);
+enum adaptive_sync_type dm_get_adaptive_sync_support_type(struct dc_link *link);
 
 enum dc_edid_status dm_helpers_get_sbios_edid(struct dc_link *link, struct dc_edid *edid);
 

drivers/gpu/drm/amd/display/include/ddc_service_types.h

···
 #define DP_BRANCH_DEVICE_ID_00E04C 0x00E04C
 #define DP_BRANCH_DEVICE_ID_006037 0x006037
 #define DP_BRANCH_DEVICE_ID_001CF8 0x001CF8
+#define DP_BRANCH_DEVICE_ID_0060AD 0x0060AD
 #define DP_BRANCH_HW_REV_10 0x10
 #define DP_BRANCH_HW_REV_20 0x20
 

drivers/gpu/drm/amd/display/modules/inc/mod_info_packet.h

···
 enum adaptive_sync_type {
 	ADAPTIVE_SYNC_TYPE_NONE                  = 0,
 	ADAPTIVE_SYNC_TYPE_DP                    = 1,
-	ADAPTIVE_SYNC_TYPE_PCON_IN_WHITELIST     = 2,
-	ADAPTIVE_SYNC_TYPE_PCON_NOT_IN_WHITELIST = 3,
+	FREESYNC_TYPE_PCON_IN_WHITELIST          = 2,
+	FREESYNC_TYPE_PCON_NOT_IN_WHITELIST      = 3,
 	ADAPTIVE_SYNC_TYPE_EDP                   = 4,
 };
 

drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c

···
 		if (stream != NULL)
 			mod_build_adaptive_sync_infopacket_v2(stream, param, info_packet);
 		break;
-	case ADAPTIVE_SYNC_TYPE_PCON_IN_WHITELIST:
+	case FREESYNC_TYPE_PCON_IN_WHITELIST:
 		mod_build_adaptive_sync_infopacket_v1(info_packet);
 		break;
 	case ADAPTIVE_SYNC_TYPE_NONE:
-	case ADAPTIVE_SYNC_TYPE_PCON_NOT_IN_WHITELIST:
+	case FREESYNC_TYPE_PCON_NOT_IN_WHITELIST:
 	default:
 		break;
 	}