Message-Id: <20240818-amdgpu-drm_edid-v1-9-aea66c1f7cf4@weissschuh.net>
Date: Sun, 18 Aug 2024 12:43:33 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>, 
 Rodrigo Siqueira <Rodrigo.Siqueira@....com>, 
 Alex Deucher <alexander.deucher@....com>, 
 Christian König <christian.koenig@....com>, 
 Xinhui Pan <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, 
 Daniel Vetter <daniel@...ll.ch>, jinzh <jinzh@...hub.amd.com>, 
 Aric Cyr <Aric.Cyr@....com>, Alan Liu <HaoPing.Liu@....com>, 
 Tony Cheng <Tony.Cheng@....com>, 
 Andrey Grodzovsky <Andrey.Grodzovsky@....com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, Harry Wentland <Harry.Wentland@....com>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 09/12] drm/amd/display: Switch amdgpu_dm_connector to
 struct drm_edid

"struct drm_edid" is the safe and recommended alternative to "struct edid".

Rename the member to make sure that no usage sites are missed,
as "struct drm_edid" has some restrictions, for example it can not be
used with kfree().

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c  | 70 ++++++++++++----------
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h  |  5 +-
 .../amd/display/amdgpu_dm/amdgpu_dm_mst_types.c    | 26 ++++----
 3 files changed, 53 insertions(+), 48 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 bd9a1a21720e..961f4f308dc7 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3426,7 +3426,7 @@ void amdgpu_dm_update_connector_after_detect(
 			aconnector->dc_sink = sink;
 			dc_sink_retain(aconnector->dc_sink);
 			amdgpu_dm_update_freesync_caps(connector,
-					aconnector->edid);
+					aconnector->drm_edid);
 		} else {
 			amdgpu_dm_update_freesync_caps(connector, NULL);
 			if (!aconnector->dc_sink) {
@@ -3485,18 +3485,18 @@ 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;
+			aconnector->drm_edid = NULL;
 			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;
+			aconnector->drm_edid = drm_edid_alloc(sink->dc_edid.raw_edid,
+							      sink->dc_edid.length);
 
 			if (aconnector->dc_link->aux_mode)
 				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
-						    aconnector->edid);
+						    drm_edid_raw(aconnector->drm_edid));
 		}
 
 		if (!aconnector->timing_requested) {
@@ -3507,8 +3507,8 @@ void amdgpu_dm_update_connector_after_detect(
 					"failed to create aconnector->requested_timing\n");
 		}
 
-		drm_connector_update_edid_property(connector, aconnector->edid);
-		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
+		drm_edid_connector_update(connector, aconnector->drm_edid);
+		amdgpu_dm_update_freesync_caps(connector, aconnector->drm_edid);
 		update_connector_ext_caps(aconnector);
 	} else {
 		drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
@@ -3517,7 +3517,7 @@ void amdgpu_dm_update_connector_after_detect(
 		aconnector->num_modes = 0;
 		dc_sink_release(aconnector->dc_sink);
 		aconnector->dc_sink = NULL;
-		aconnector->edid = NULL;
+		aconnector->drm_edid = NULL;
 		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 */
@@ -7016,7 +7016,7 @@ 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;
+	const struct drm_edid *drm_edid;
 	struct i2c_adapter *ddc;
 
 	if (dc_link && dc_link->aux_mode)
@@ -7025,23 +7025,25 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
 		ddc = &aconnector->i2c->base;
 
 	/*
-	 * Note: drm_get_edid gets edid in the following order:
+	 * Note: drm_edid_read_ddc gets edid in the following order:
 	 * 1) override EDID if set via edid_override debugfs,
 	 * 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_ddc(connector, ddc);
+	if (!drm_edid) {
 		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
 		return;
 	}
 
-	aconnector->edid = edid;
+	aconnector->drm_edid = drm_edid;
 
 	/* Update emulated (virtual) sink's EDID */
 	if (dc_em_sink && dc_link) {
 		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,
+			drm_edid_raw(drm_edid),
+			(drm_edid_raw(drm_edid)->extensions + 1) * EDID_LENGTH);
 		dm_helpers_parse_edid_caps(
 			dc_link,
 			&dc_em_sink->dc_edid,
@@ -7076,7 +7078,7 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
 			.link = aconnector->dc_link,
 			.sink_signal = SIGNAL_TYPE_VIRTUAL
 	};
-	struct edid *edid;
+	const struct drm_edid *drm_edid;
 	struct i2c_adapter *ddc;
 
 	if (dc_link->aux_mode)
@@ -7085,25 +7087,25 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
 		ddc = &aconnector->i2c->base;
 
 	/*
-	 * Note: drm_get_edid gets edid in the following order:
+	 * Note: drm_edid_read_ddc gets edid in the following order:
 	 * 1) override EDID if set via edid_override debugfs,
 	 * 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_ddc(connector, ddc);
+	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->drm_edid = drm_edid;
 
 	aconnector->dc_em_sink = dc_link_add_remote_sink(
 		aconnector->dc_link,
-		edid,
+		drm_edid_raw(drm_edid),
 		&init_params);
 
 	if (aconnector->base.force == DRM_FORCE_ON) {
@@ -7786,16 +7788,17 @@ 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);
+		drm_edid_connector_update(connector, drm_edid);
 		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
@@ -7809,10 +7812,10 @@ 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_connector_edid_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;
 	}
@@ -7908,12 +7911,12 @@ 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)
@@ -7926,24 +7929,24 @@ 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->drm_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);
 		if (encoder)
 			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);
 
@@ -11953,12 +11956,13 @@ static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
  * FreeSync parameters.
  */
 void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
-				    const struct edid *edid)
+				    const struct drm_edid *drm_edid)
 {
 	int i = 0;
 	const struct detailed_timing *timing;
 	const struct detailed_non_pixel *data;
 	const struct detailed_data_monitor_range *range;
+	const struct edid *edid = drm_edid_raw(drm_edid);
 	struct amdgpu_dm_connector *amdgpu_dm_connector =
 			to_amdgpu_dm_connector(connector);
 	struct dm_connector_state *dm_con_state = NULL;
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 27c0017707dd..c49cc0170fc5 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -81,6 +81,7 @@ struct amdgpu_bo;
 struct dmub_srv;
 struct dc_plane_state;
 struct dmub_notification;
+struct drm_edid;
 
 struct amd_vsdb_block {
 	unsigned char ieee_id[3];
@@ -673,7 +674,7 @@ 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 *drm_edid;
 
 	/* shared with amdgpu */
 	struct amdgpu_hpd hpd;
@@ -951,7 +952,7 @@ void dm_restore_drm_connector_state(struct drm_device *dev,
 				    struct drm_connector *connector);
 
 void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
-					const 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_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 25e98d248c21..cd03108db28b 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
@@ -129,7 +129,7 @@ dm_dp_mst_connector_destroy(struct drm_connector *connector)
 		dc_sink_release(aconnector->dc_sink);
 	}
 
-	kfree(aconnector->edid);
+	kfree(aconnector->drm_edid);
 
 	drm_connector_cleanup(connector);
 	drm_dp_mst_put_port_malloc(aconnector->mst_output_port);
@@ -182,7 +182,7 @@ amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector)
 
 		dc_sink_release(dc_sink);
 		aconnector->dc_sink = NULL;
-		aconnector->edid = NULL;
+		aconnector->drm_edid = NULL;
 		aconnector->dsc_aux = NULL;
 		port->passthrough_aux = NULL;
 	}
@@ -302,12 +302,13 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 	if (!aconnector)
 		return drm_add_edid_modes(connector, NULL);
 
-	if (!aconnector->edid) {
-		struct edid *edid;
+	if (!aconnector->drm_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);
 
@@ -344,7 +345,7 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 			return ret;
 		}
 
-		aconnector->edid = edid;
+		aconnector->drm_edid = drm_edid;
 		amdgpu_dm_set_mst_status(&aconnector->mst_status,
 			MST_REMOTE_EDID, true);
 	}
@@ -361,7 +362,7 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 				.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
 		dc_sink = dc_link_add_remote_sink(
 			aconnector->dc_link,
-			aconnector->edid,
+			drm_edid_raw(aconnector->drm_edid),
 			&init_params);
 
 		if (!dc_sink) {
@@ -403,7 +404,7 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 
 		if (aconnector->dc_sink) {
 			amdgpu_dm_update_freesync_caps(
-					connector, aconnector->edid);
+					connector, aconnector->drm_edid);
 
 #if defined(CONFIG_DRM_AMD_DC_FP)
 			if (!validate_dsc_caps_on_connector(aconnector))
@@ -417,10 +418,9 @@ 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->drm_edid);
 
-	ret = drm_add_edid_modes(connector, aconnector->edid);
+	ret = drm_edid_connector_add_modes(connector);
 
 	return ret;
 }
@@ -498,7 +498,7 @@ dm_dp_mst_detect(struct drm_connector *connector,
 
 		dc_sink_release(aconnector->dc_sink);
 		aconnector->dc_sink = NULL;
-		aconnector->edid = NULL;
+		aconnector->drm_edid = NULL;
 		aconnector->dsc_aux = NULL;
 		port->passthrough_aux = NULL;
 

-- 
2.46.0

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