drm/amd/display: Get replay info from VSDB

We need to make sure that the panel supports replay.

This info is inside the amd vsdb (vendor specific data block). Create a
function to parse the block and read the replay_mode bit.

Signed-off-by: Bhawanpreet Lakha <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Bhawanpreet Lakha

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

@@ -10490,6 +10490,41 @@ static bool parse_edid_cea(struct amdgpu_dm_connector *aconnector,
 	return ret;
 }
 
+static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector,
+			  struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
+{
+	u8 *edid_ext = NULL;
+	int i;
+	int j = 0;
+
+	if (edid == NULL || edid->extensions == 0)
+		return -ENODEV;
+
+	/* Find DisplayID extension */
+	for (i = 0; i < edid->extensions; i++) {
+		edid_ext = (void *)(edid + (i + 1));
+		if (edid_ext[0] == DISPLAYID_EXT)
+			break;
+	}
+
+	while (j < EDID_LENGTH) {
+		struct amd_vsdb_block *amd_vsdb = (struct amd_vsdb_block *)&edid_ext[j];
+		unsigned int ieeeId = (amd_vsdb->ieee_id[2] << 16) | (amd_vsdb->ieee_id[1] << 8) | (amd_vsdb->ieee_id[0]);
+
+		if (ieeeId == HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_IEEE_REGISTRATION_ID &&
+				amd_vsdb->version == HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_VERSION_3) {
+			vsdb_info->replay_mode = (amd_vsdb->feature_caps & AMD_VSDB_VERSION_3_FEATURECAP_REPLAYMODE) ? true : false;
+			vsdb_info->amd_vsdb_version = HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_VERSION_3;
+			DRM_DEBUG_KMS("Panel supports Replay Mode: %d\n", vsdb_info->replay_mode);
+
+			return true;
+		}
+		j++;
+	}
+
+	return false;
+}
+
 static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
 		struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
 {
@@ -10625,6 +10660,14 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 				freesync_capable = true;
 			}
 		}
+		parse_amd_vsdb(amdgpu_dm_connector, edid, &vsdb_info);
+
+		if (vsdb_info.replay_mode) {
+			amdgpu_dm_connector->vsdb_info.replay_mode = vsdb_info.replay_mode;
+			amdgpu_dm_connector->vsdb_info.amd_vsdb_version = vsdb_info.amd_vsdb_version;
+			amdgpu_dm_connector->as_type = ADAPTIVE_SYNC_TYPE_EDP;
+		}
+
 	} else if (edid && sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) {
 		i = parse_hdmi_amd_vsdb(amdgpu_dm_connector, edid, &vsdb_info);
 		if (i >= 0 && vsdb_info.freesync_supported) {

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

@@ -51,6 +51,9 @@
 
 #define AMDGPU_DMUB_NOTIFICATION_MAX 5
 
+#define HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_IEEE_REGISTRATION_ID 0x00001A
+#define AMD_VSDB_VERSION_3_FEATURECAP_REPLAYMODE 0x40
+#define HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_VERSION_3 0x3
 /*
 #include "include/amdgpu_dal_power_if.h"
 #include "amdgpu_dm_irq.h"
@@ -75,6 +78,12 @@ struct dmub_srv;
 struct dc_plane_state;
 struct dmub_notification;
 
+struct amd_vsdb_block {
+	unsigned char ieee_id[3];
+	unsigned char version;
+	unsigned char feature_caps;
+};
+
 struct common_irq_params {
 	struct amdgpu_device *adev;
 	enum dc_irq_source irq_src;
@@ -609,6 +618,11 @@ struct amdgpu_hdmi_vsdb_info {
 	 * @max_refresh_rate_hz: FreeSync Maximum Refresh Rate in Hz
 	 */
 	unsigned int max_refresh_rate_hz;
+
+	/**
+	 * @replay mode: Replay supported
+	 */
+	bool replay_mode;
 };
 
 struct amdgpu_dm_connector {

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

@@ -46,6 +46,9 @@ static bool link_supports_replay(struct dc_link *link, struct amdgpu_dm_connecto
 	if (!state->freesync_capable)
 		return false;
 
+	if (!aconnector->vsdb_info.replay_mode)
+		return false;
+
 	// Check the eDP version
 	if (dpcd_caps->edp_rev < EDP_REVISION_13)
 		return false;
@@ -71,6 +74,10 @@ bool amdgpu_dm_setup_replay(struct dc_link *link, struct amdgpu_dm_connector *ac
 	struct replay_config pr_config;
 	union replay_debug_flags *debug_flags = NULL;
 
+	// For eDP, if Replay is supported, return true to skip checks
+	if (link->replay_settings.config.replay_supported)
+		return true;
+
 	if (!dc_is_embedded_signal(link->connector_signal))
 		return false;