linux-kernel - [PATCH v3 drm-dp 5/8] drm/hisilicon/hibmc: Getting connector info and EDID by using AUX channel

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Message-ID: <20250222025102.1519798-6-shiyongbang@huawei.com>
Date: Sat, 22 Feb 2025 10:50:58 +0800
From: Yongbang Shi <shiyongbang@...wei.com>
To: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<kong.kongxinwei@...ilicon.com>
CC: <liangjian010@...wei.com>, <chenjianmin@...wei.com>,
	<lidongming5@...wei.com>, <shiyongbang@...wei.com>, <libaihan@...wei.com>,
	<shenjian15@...wei.com>, <shaojijie@...wei.com>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 drm-dp 5/8] drm/hisilicon/hibmc: Getting connector info and EDID by using AUX channel

From: Baihan Li <libaihan@...wei.com>

Add registering drm_aux and use it to get connector edid with drm
functions. Add ddc channel in connector initialization to put drm_aux
in drm_connector. And also add detect callback to detect connector
befored call connector_get_modes.

Signed-off-by: Baihan Li <libaihan@...wei.com>
Signed-off-by: Yongbang Shi <shiyongbang@...wei.com>
---
ChangeLog:
v2 -> v3:
  - Capitalized EDID and AUX, suggested by Dmitry Baryshkov.
v1 -> v2:
  - deleting type conversion, suggested by Dmitry Baryshkov.
  - deleting hibmc_dp_connector_get_modes() and using drm_connector_helper_get_modes(), suggested by Dmitry Baryshkov.
---
 drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c   |  3 +-
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c    | 33 ++++++++++++++++---
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h   |  5 +++
 3 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
index ded9e7ce887a..e0bb9b14d9d8 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
@@ -161,7 +161,8 @@ void hibmc_dp_aux_init(struct hibmc_dp *dp)
 				 HIBMC_DP_MIN_PULSE_NUM);
 
 	dp->aux.transfer = hibmc_dp_aux_xfer;
-	dp->aux.is_remote = 0;
+	dp->aux.name = kasprintf(GFP_KERNEL, "HIBMC DRM dp aux");
+	dp->aux.drm_dev = dp->drm_dev;
 	drm_dp_aux_init(&dp->aux);
 	dp->dp_dev->aux = &dp->aux;
 }
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
index 603d6b198a54..1cb9c32f9ef0 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
@@ -15,25 +15,48 @@
 
 static int hibmc_dp_connector_get_modes(struct drm_connector *connector)
 {
+	struct hibmc_dp *dp = to_hibmc_dp(connector);
+	const struct drm_edid *drm_edid;
 	int count;
 
-	count = drm_add_modes_noedid(connector, connector->dev->mode_config.max_width,
-				     connector->dev->mode_config.max_height);
-	drm_set_preferred_mode(connector, 1024, 768); // temporary implementation
+	drm_edid = drm_edid_read_ddc(connector, &dp->aux.ddc);
+
+	drm_edid_connector_update(connector, drm_edid);
+
+	count = drm_edid_connector_add_modes(connector);
+
+	drm_edid_free(drm_edid);
 
 	return count;
 }
 
 static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = {
 	.get_modes = hibmc_dp_connector_get_modes,
+	.detect_ctx = drm_connector_helper_detect_from_ddc,
 };
 
+static int hibmc_dp_late_register(struct drm_connector *connector)
+{
+	struct hibmc_dp *dp = to_hibmc_dp(connector);
+
+	return drm_dp_aux_register(&dp->aux);
+}
+
+static void hibmc_dp_early_unregister(struct drm_connector *connector)
+{
+	struct hibmc_dp *dp = to_hibmc_dp(connector);
+
+	drm_dp_aux_unregister(&dp->aux);
+}
+
 static const struct drm_connector_funcs hibmc_dp_conn_funcs = {
 	.reset = drm_atomic_helper_connector_reset,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = drm_connector_cleanup,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.late_register = hibmc_dp_late_register,
+	.early_unregister = hibmc_dp_early_unregister,
 };
 
 static inline int hibmc_dp_prepare(struct hibmc_dp *dp, struct drm_display_mode *mode)
@@ -103,8 +126,8 @@ int hibmc_dp_init(struct hibmc_drm_private *priv)
 
 	drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs);
 
-	ret = drm_connector_init(dev, connector, &hibmc_dp_conn_funcs,
-				 DRM_MODE_CONNECTOR_DisplayPort);
+	ret = drm_connector_init_with_ddc(dev, connector, &hibmc_dp_conn_funcs,
+					  DRM_MODE_CONNECTOR_DisplayPort, &dp->aux.ddc);
 	if (ret) {
 		drm_err(dev, "init dp connector failed: %d\n", ret);
 		return ret;
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
index d982f1e4b958..3ddd71aada66 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
@@ -47,6 +47,11 @@ static inline struct hibmc_vdac *to_hibmc_vdac(struct drm_connector *connector)
 	return container_of(connector, struct hibmc_vdac, connector);
 }
 
+static inline struct hibmc_dp *to_hibmc_dp(struct drm_connector *connector)
+{
+	return container_of(connector, struct hibmc_dp, connector);
+}
+
 static inline struct hibmc_drm_private *to_hibmc_drm_private(struct drm_device *dev)
 {
 	return container_of(dev, struct hibmc_drm_private, dev);
-- 
2.33.0