[RFC PATCH v2 3/6] drm/amd/display: switch amdgpu_dm_connector to use struct drm_edid

[Melissa Wen <mwen@igalia.com>]

Replace raw edid handling (struct edid) with the opaque EDID type
(struct drm_edid) on amdgpu_dm_connector for consistency. It may also
prevent mismatch of approaches in different parts of the driver code.
Working in progress. It was only exercised with IGT tests.

v2: use const to fix warnings (Alex Hung)

Signed-off-by: Melissa Wen <mwen@igalia.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 99 +++++++++----------
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  4 +-
 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c |  8 +-
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 28 +++---
 4 files changed, 69 insertions(+), 70 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 280562707cd0..bbbf9c9d40d5 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3269,18 +3269,19 @@ void amdgpu_dm_update_connector_after_detect(
 		aconnector->dc_sink = sink;
 		dc_sink_retain(aconnector->dc_sink);
 		if (sink->dc_edid.length == 0) {
-			aconnector->edid = NULL;
+			drm_edid_free(aconnector->edid);
 			if (aconnector->dc_link->aux_mode) {
 				drm_dp_cec_unset_edid(
 					&aconnector->dm_dp_aux.aux);
 			}
 		} else {
-			aconnector->edid =
-				(struct edid *)sink->dc_edid.raw_edid;
+			const struct edid *edid = (const struct edid *)sink->dc_edid.raw_edid;
+			aconnector->edid = drm_edid_alloc(edid, sink->dc_edid.length);
 
+			/* FIXME: Get rid of drm_edid_raw() */
 			if (aconnector->dc_link->aux_mode)
 				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
-						    aconnector->edid);
+						    drm_edid_raw(aconnector->edid));
 		}
 
 		if (!aconnector->timing_requested) {
@@ -3291,17 +3292,17 @@ void amdgpu_dm_update_connector_after_detect(
 					"failed to create aconnector->requested_timing\n");
 		}
 
-		drm_connector_update_edid_property(connector, aconnector->edid);
+		drm_edid_connector_update(connector, aconnector->edid);
 		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
 		update_connector_ext_caps(aconnector);
 	} else {
 		drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
 		amdgpu_dm_update_freesync_caps(connector, NULL);
-		drm_connector_update_edid_property(connector, NULL);
+		drm_edid_connector_update(connector, NULL);
 		aconnector->num_modes = 0;
 		dc_sink_release(aconnector->dc_sink);
 		aconnector->dc_sink = NULL;
-		aconnector->edid = NULL;
+		drm_edid_free(aconnector->edid);
 		kfree(aconnector->timing_requested);
 		aconnector->timing_requested = NULL;
 		/* Set CP to DESIRED if it was ENABLED, so we can re-enable it again on hotplug */
@@ -6661,13 +6662,7 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 	struct dc_link *dc_link = aconnector->dc_link;
 	struct dc_sink *dc_em_sink = aconnector->dc_em_sink;
-	struct edid *edid;
-	struct i2c_adapter *ddc;
-
-	if (dc_link && dc_link->aux_mode)
-		ddc = &aconnector->dm_dp_aux.aux.ddc;
-	else
-		ddc = &aconnector->i2c->base;
+	const struct drm_edid *drm_edid;
 
 	/*
 	 * Note: drm_get_edid gets edid in the following order:
@@ -6675,18 +6670,20 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
 	 * 2) firmware EDID if set via edid_firmware module parameter
 	 * 3) regular DDC read.
 	 */
-	edid = drm_get_edid(connector, ddc);
-	if (!edid) {
+	drm_edid = drm_edid_read(connector);
+
+	if (!drm_edid) {
 		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
 		return;
 	}
-
-	aconnector->edid = edid;
-
+	aconnector->edid = drm_edid;
+	drm_edid_connector_update(connector, drm_edid);
 	/* Update emulated (virtual) sink's EDID */
 	if (dc_em_sink && dc_link) {
+		const struct edid *edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
+
 		memset(&dc_em_sink->edid_caps, 0, sizeof(struct dc_edid_caps));
-		memmove(dc_em_sink->dc_edid.raw_edid, edid, (edid->extensions + 1) * EDID_LENGTH);
+		memmove(dc_em_sink->dc_edid.raw_edid, (uint8_t *)edid, (edid->extensions + 1) * EDID_LENGTH);
 		dm_helpers_parse_edid_caps(
 			dc_link,
 			&dc_em_sink->dc_edid,
@@ -6716,18 +6713,12 @@ static int get_modes(struct drm_connector *connector)
 static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
 {
 	struct drm_connector *connector = &aconnector->base;
-	struct dc_link *dc_link = aconnector->dc_link;
 	struct dc_sink_init_data init_params = {
 			.link = aconnector->dc_link,
 			.sink_signal = SIGNAL_TYPE_VIRTUAL
 	};
-	struct edid *edid;
-	struct i2c_adapter *ddc;
-
-	if (dc_link->aux_mode)
-		ddc = &aconnector->dm_dp_aux.aux.ddc;
-	else
-		ddc = &aconnector->i2c->base;
+	const struct drm_edid *drm_edid;
+	const struct edid *edid;
 
 	/*
 	 * Note: drm_get_edid gets edid in the following order:
@@ -6735,17 +6726,19 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
 	 * 2) firmware EDID if set via edid_firmware module parameter
 	 * 3) regular DDC read.
 	 */
-	edid = drm_get_edid(connector, ddc);
-	if (!edid) {
+	drm_edid = drm_edid_read(connector);
+	if (!drm_edid) {
 		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
 		return;
 	}
 
-	if (drm_detect_hdmi_monitor(edid))
+	if (connector->display_info.is_hdmi)
 		init_params.sink_signal = SIGNAL_TYPE_HDMI_TYPE_A;
 
-	aconnector->edid = edid;
+	aconnector->edid = drm_edid;
+	drm_edid_connector_update(connector, drm_edid);
 
+	edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
 	aconnector->dc_em_sink = dc_link_add_remote_sink(
 		aconnector->dc_link,
 		(uint8_t *)edid,
@@ -7428,16 +7421,16 @@ static void amdgpu_set_panel_orientation(struct drm_connector *connector)
 }
 
 static void amdgpu_dm_connector_ddc_get_modes(struct drm_connector *connector,
-					      struct edid *edid)
+					      const struct drm_edid *drm_edid)
 {
 	struct amdgpu_dm_connector *amdgpu_dm_connector =
 			to_amdgpu_dm_connector(connector);
 
-	if (edid) {
+	if (drm_edid) {
 		/* empty probed_modes */
 		INIT_LIST_HEAD(&connector->probed_modes);
 		amdgpu_dm_connector->num_modes =
-				drm_add_edid_modes(connector, edid);
+				drm_edid_connector_add_modes(connector);
 
 		/* sorting the probed modes before calling function
 		 * amdgpu_dm_get_native_mode() since EDID can have
@@ -7451,10 +7444,10 @@ static void amdgpu_dm_connector_ddc_get_modes(struct drm_connector *connector,
 		amdgpu_dm_get_native_mode(connector);
 
 		/* Freesync capabilities are reset by calling
-		 * drm_add_edid_modes() and need to be
+		 * drm_edid_connector_add_modes() and need to be
 		 * restored here.
 		 */
-		amdgpu_dm_update_freesync_caps(connector, edid);
+		amdgpu_dm_update_freesync_caps(connector, drm_edid);
 	} else {
 		amdgpu_dm_connector->num_modes = 0;
 	}
@@ -7550,12 +7543,12 @@ static uint add_fs_modes(struct amdgpu_dm_connector *aconnector)
 }
 
 static void amdgpu_dm_connector_add_freesync_modes(struct drm_connector *connector,
-						   struct edid *edid)
+						   const struct drm_edid *drm_edid)
 {
 	struct amdgpu_dm_connector *amdgpu_dm_connector =
 		to_amdgpu_dm_connector(connector);
 
-	if (!(amdgpu_freesync_vid_mode && edid))
+	if (!(amdgpu_freesync_vid_mode && drm_edid))
 		return;
 
 	if (amdgpu_dm_connector->max_vfreq - amdgpu_dm_connector->min_vfreq > 10)
@@ -7568,23 +7561,23 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector)
 	struct amdgpu_dm_connector *amdgpu_dm_connector =
 			to_amdgpu_dm_connector(connector);
 	struct drm_encoder *encoder;
-	struct edid *edid = amdgpu_dm_connector->edid;
+	const struct drm_edid *drm_edid = amdgpu_dm_connector->edid;
 	struct dc_link_settings *verified_link_cap =
 			&amdgpu_dm_connector->dc_link->verified_link_cap;
 	const struct dc *dc = amdgpu_dm_connector->dc_link->dc;
 
 	encoder = amdgpu_dm_connector_to_encoder(connector);
 
-	if (!drm_edid_is_valid(edid)) {
+	if (!drm_edid_valid(drm_edid)) {
 		amdgpu_dm_connector->num_modes =
 				drm_add_modes_noedid(connector, 640, 480);
 		if (dc->link_srv->dp_get_encoding_format(verified_link_cap) == DP_128b_132b_ENCODING)
 			amdgpu_dm_connector->num_modes +=
 				drm_add_modes_noedid(connector, 1920, 1080);
 	} else {
-		amdgpu_dm_connector_ddc_get_modes(connector, edid);
+		amdgpu_dm_connector_ddc_get_modes(connector, drm_edid);
 		amdgpu_dm_connector_add_common_modes(encoder, connector);
-		amdgpu_dm_connector_add_freesync_modes(connector, edid);
+		amdgpu_dm_connector_add_freesync_modes(connector, drm_edid);
 	}
 	amdgpu_dm_fbc_init(connector);
 
@@ -11153,7 +11146,7 @@ static bool parse_edid_cea(struct amdgpu_dm_connector *aconnector,
 }
 
 static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector,
-			  struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
+			  const struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
 {
 	u8 *edid_ext = NULL;
 	int i;
@@ -11188,7 +11181,8 @@ static int parse_amd_vsdb(struct amdgpu_dm_connector *aconnector,
 }
 
 static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
-		struct edid *edid, struct amdgpu_hdmi_vsdb_info *vsdb_info)
+			       const struct edid *edid,
+			       struct amdgpu_hdmi_vsdb_info *vsdb_info)
 {
 	u8 *edid_ext = NULL;
 	int i;
@@ -11230,19 +11224,19 @@ static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
  * FreeSync parameters.
  */
 void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
-				    struct edid *edid)
+				    const struct drm_edid *drm_edid)
 {
 	int i = 0;
-	struct detailed_timing *timing;
-	struct detailed_non_pixel *data;
-	struct detailed_data_monitor_range *range;
+	const struct detailed_timing *timing;
+	const struct detailed_non_pixel *data;
+	const struct detailed_data_monitor_range *range;
 	struct amdgpu_dm_connector *amdgpu_dm_connector =
 			to_amdgpu_dm_connector(connector);
 	struct dm_connector_state *dm_con_state = NULL;
 	struct dc_sink *sink;
-
 	struct amdgpu_device *adev = drm_to_adev(connector->dev);
 	struct amdgpu_hdmi_vsdb_info vsdb_info = {0};
+	const struct edid *edid;
 	bool freesync_capable = false;
 	enum adaptive_sync_type as_type = ADAPTIVE_SYNC_TYPE_NONE;
 
@@ -11255,7 +11249,7 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 		amdgpu_dm_connector->dc_sink :
 		amdgpu_dm_connector->dc_em_sink;
 
-	if (!edid || !sink) {
+	if (!drm_edid || !sink) {
 		dm_con_state = to_dm_connector_state(connector->state);
 
 		amdgpu_dm_connector->min_vfreq = 0;
@@ -11272,6 +11266,7 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 	if (!adev->dm.freesync_module)
 		goto update;
 
+	edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
 	if (edid && (sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT ||
 		     sink->sink_signal == SIGNAL_TYPE_EDP)) {
 		bool edid_check_required = false;
@@ -11341,7 +11336,7 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 			amdgpu_dm_connector->as_type = ADAPTIVE_SYNC_TYPE_EDP;
 		}
 
-	} else if (edid && sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) {
+	} else if (drm_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) {
 			amdgpu_dm_connector->min_vfreq = vsdb_info.min_refresh_rate_hz;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index 67647bb5999b..384f68203590 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -637,7 +637,7 @@ struct amdgpu_dm_connector {
 
 	/* we need to mind the EDID between detect
 	   and get modes due to analog/digital/tvencoder */
-	struct edid *edid;
+	const struct drm_edid *edid;
 
 	/* shared with amdgpu */
 	struct amdgpu_hpd hpd;
@@ -908,7 +908,7 @@ void dm_restore_drm_connector_state(struct drm_device *dev,
 				    struct drm_connector *connector);
 
 void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
-					struct edid *edid);
+				    const struct drm_edid *drm_edid);
 
 void amdgpu_dm_trigger_timing_sync(struct drm_device *dev);
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index c27063305a13..1a37dff9c2b6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -901,7 +901,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
 	struct i2c_adapter *ddc;
 	int retry = 3;
 	enum dc_edid_status edid_status;
-	struct edid *edid;
+	const struct drm_edid *drm_edid;
+	const struct edid *edid;
 
 	if (link->aux_mode)
 		ddc = &aconnector->dm_dp_aux.aux.ddc;
@@ -913,7 +914,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
 	 */
 	do {
 
-		edid = drm_get_edid(&aconnector->base, ddc);
+		drm_edid = drm_edid_read_ddc(connector, ddc);
+		edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
 
 		/* DP Compliance Test 4.2.2.6 */
 		if (link->aux_mode && connector->edid_corrupt)
@@ -931,7 +933,7 @@ enum dc_edid_status dm_helpers_read_local_edid(
 		memmove(sink->dc_edid.raw_edid, (uint8_t *)edid, sink->dc_edid.length);
 
 		/* We don't need the original edid anymore */
-		kfree(edid);
+		drm_edid_free(drm_edid);
 
 		edid_status = dm_helpers_parse_edid_caps(
 						link,
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 941e96f100f4..f6f32c0328de 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -128,7 +128,7 @@ dm_dp_mst_connector_destroy(struct drm_connector *connector)
 		dc_sink_release(aconnector->dc_sink);
 	}
 
-	kfree(aconnector->edid);
+	drm_edid_free(aconnector->edid);
 
 	drm_connector_cleanup(connector);
 	drm_dp_mst_put_port_malloc(aconnector->mst_output_port);
@@ -181,7 +181,7 @@ amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector)
 
 		dc_sink_release(dc_sink);
 		aconnector->dc_sink = NULL;
-		aconnector->edid = NULL;
+		drm_edid_free(aconnector->edid);
 	}
 
 	aconnector->mst_status = MST_STATUS_DEFAULT;
@@ -298,15 +298,15 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 		return drm_add_edid_modes(connector, NULL);
 
 	if (!aconnector->edid) {
-		struct edid *edid;
+		const struct drm_edid *drm_edid;
 
-		edid = drm_dp_mst_get_edid(connector, &aconnector->mst_root->mst_mgr, aconnector->mst_output_port);
+		drm_edid = drm_dp_mst_edid_read(connector, &aconnector->mst_root->mst_mgr, aconnector->mst_output_port);
 
-		if (!edid) {
+		if (!drm_edid) {
 			amdgpu_dm_set_mst_status(&aconnector->mst_status,
 			MST_REMOTE_EDID, false);
 
-			drm_connector_update_edid_property(
+			drm_edid_connector_update(
 				&aconnector->base,
 				NULL);
 
@@ -340,7 +340,7 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 			return ret;
 		}
 
-		aconnector->edid = edid;
+		aconnector->edid = drm_edid;
 		amdgpu_dm_set_mst_status(&aconnector->mst_status,
 			MST_REMOTE_EDID, true);
 	}
@@ -355,10 +355,13 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 		struct dc_sink_init_data init_params = {
 				.link = aconnector->dc_link,
 				.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
+		const struct edid *edid;
+
+		edid = drm_edid_raw(aconnector->edid); // FIXME: Get rid of drm_edid_raw()
 		dc_sink = dc_link_add_remote_sink(
 			aconnector->dc_link,
-			(uint8_t *)aconnector->edid,
-			(aconnector->edid->extensions + 1) * EDID_LENGTH,
+			(uint8_t *)edid,
+			(edid->extensions + 1) * EDID_LENGTH,
 			&init_params);
 
 		if (!dc_sink) {
@@ -412,10 +415,9 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 		}
 	}
 
-	drm_connector_update_edid_property(
-					&aconnector->base, aconnector->edid);
+	drm_edid_connector_update(&aconnector->base, aconnector->edid);
 
-	ret = drm_add_edid_modes(connector, aconnector->edid);
+	ret = drm_edid_connector_add_modes(connector);
 
 	return ret;
 }
@@ -493,7 +495,7 @@ dm_dp_mst_detect(struct drm_connector *connector,
 
 		dc_sink_release(aconnector->dc_sink);
 		aconnector->dc_sink = NULL;
-		aconnector->edid = NULL;
+		drm_edid_free(aconnector->edid);
 
 		amdgpu_dm_set_mst_status(&aconnector->mst_status,
 			MST_REMOTE_EDID | MST_ALLOCATE_NEW_PAYLOAD | MST_CLEAR_ALLOCATED_PAYLOAD,
-- 
2.43.0