[PATCH v6 1/4] drm/bridge: anx7625: send DPCD command to downstream

[PATCH v6 1/4] drm/bridge: anx7625: send DPCD command to downstream

[Hsin-Yi Wang]

From: Xin Ji <xji@analogixsemi.com>

Send DPCD command to downstream before anx7625 power down,
let downstream monitor enter into standby mode.

Signed-off-by: Xin Ji <xji@analogixsemi.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
v3->v4:
Use common DP_AUX_NATIVE_READ/WRITE

Previously in:
https://patchwork.kernel.org/project/dri-devel/patch/1f36f8bf0a48fb2bba17bacec23700e58c1d407d.1641891874.git.xji@analogixsemi.com/
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 42 +++++++++++++++++++----
 drivers/gpu/drm/bridge/analogix/anx7625.h |  2 --
 2 files changed, 35 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 76662fce4ce61d..17b23940549a42 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -129,6 +129,23 @@ static int anx7625_reg_write(struct anx7625_data *ctx,
 	return ret;
 }
 
+static int anx7625_reg_block_write(struct anx7625_data *ctx,
+				   struct i2c_client *client,
+				   u8 reg_addr, u8 len, u8 *buf)
+{
+	int ret;
+	struct device *dev = &client->dev;
+
+	i2c_access_workaround(ctx, client);
+
+	ret = i2c_smbus_write_i2c_block_data(client, reg_addr, len, buf);
+	if (ret < 0)
+		dev_err(dev, "write i2c block failed id=%x\n:%x",
+			client->addr, reg_addr);
+
+	return ret;
+}
+
 static int anx7625_write_or(struct anx7625_data *ctx,
 			    struct i2c_client *client,
 			    u8 offset, u8 mask)
@@ -214,8 +231,8 @@ static int wait_aux_op_finish(struct anx7625_data *ctx)
 	return 0;
 }
 
-static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
-				 u32 address, u8 len, u8 *buf)
+static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
+				  u32 address, u8 len, u8 *buf)
 {
 	struct device *dev = &ctx->client->dev;
 	int ret;
@@ -231,8 +248,7 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
 	addrm = (address >> 8) & 0xFF;
 	addrh = (address >> 16) & 0xFF;
 
-	cmd = DPCD_CMD(len, DPCD_READ);
-	cmd = ((len - 1) << 4) | 0x09;
+	cmd = DPCD_CMD(len, op);
 
 	/* Set command and length */
 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
@@ -246,6 +262,9 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
 				 AP_AUX_ADDR_19_16, addrh);
 
+	if (op == DP_AUX_NATIVE_WRITE)
+		ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
+					       AP_AUX_BUFF_START, len, buf);
 	/* Enable aux access */
 	ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
 				AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
@@ -255,14 +274,17 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
 		return -EIO;
 	}
 
-	usleep_range(2000, 2100);
-
 	ret = wait_aux_op_finish(ctx);
 	if (ret) {
 		dev_err(dev, "aux IO error: wait aux op finish.\n");
 		return ret;
 	}
 
+	/* Write done */
+	if (op == DP_AUX_NATIVE_WRITE)
+		return 0;
+
+	/* Read done, read out dpcd data */
 	ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
 				     AP_AUX_BUFF_START, len, buf);
 	if (ret < 0) {
@@ -845,7 +867,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx)
 	}
 
 	/* Read downstream capability */
-	anx7625_aux_dpcd_read(ctx, 0x68028, 1, &bcap);
+	anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap);
 	if (!(bcap & 0x01)) {
 		pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
 		return 0;
@@ -918,6 +940,7 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
 {
 	struct device *dev = &ctx->client->dev;
 	int ret;
+	u8 data;
 
 	DRM_DEV_DEBUG_DRIVER(dev, "stop dp output\n");
 
@@ -929,6 +952,11 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
 	ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, 0x08, 0x7f);
 
 	ret |= anx7625_video_mute_control(ctx, 1);
+
+	dev_dbg(dev, "notify downstream enter into standby\n");
+	/* Downstream monitor enter into standby mode */
+	data = 2;
+	ret |= anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
 	if (ret < 0)
 		DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
 
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 56165f5b254c14..64a8ab56529404 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -242,8 +242,6 @@
 
 #define AP_AUX_COMMAND	0x27  /* com+len */
 #define LENGTH_SHIFT	4
-#define DPCD_READ	0x09
-#define DPCD_WRITE	0x08
 #define DPCD_CMD(len, cmd)	((((len) - 1) << LENGTH_SHIFT) | (cmd))
 
 /* Bit 0&1: 3D video structure */
-- 
2.35.0.rc2.247.g8bbb082509-goog

[PATCH v6 2/4] drm/bridge: anx7625: Convert to use devm_kzalloc

[Hsin-Yi Wang]

Use devm_kzalloc instead of kzalloc and drop kfree(). Let the memory
handled by driver detach.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Xin Ji <xji@analogixsemi.com>
---
v2->v3: remove kfree() in anx7625_i2c_remove().
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 17b23940549a42..b7e3373994b480 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2515,7 +2515,7 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 		return -ENODEV;
 	}
 
-	platform = kzalloc(sizeof(*platform), GFP_KERNEL);
+	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
 	if (!platform) {
 		DRM_DEV_ERROR(dev, "fail to allocate driver data\n");
 		return -ENOMEM;
@@ -2527,7 +2527,7 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	if (ret) {
 		if (ret != -EPROBE_DEFER)
 			DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret);
-		goto free_platform;
+		return ret;
 	}
 
 	platform->client = client;
@@ -2552,7 +2552,7 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	if (!platform->hdcp_workqueue) {
 		dev_err(dev, "fail to create work queue\n");
 		ret = -ENOMEM;
-		goto free_platform;
+		return ret;
 	}
 
 	platform->pdata.intp_irq = client->irq;
@@ -2637,9 +2637,6 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	if (platform->hdcp_workqueue)
 		destroy_workqueue(platform->hdcp_workqueue);
 
-free_platform:
-	kfree(platform);
-
 	return ret;
 }
 
@@ -2666,7 +2663,6 @@ static int anx7625_i2c_remove(struct i2c_client *client)
 	if (platform->pdata.audio_en)
 		anx7625_unregister_audio(platform);
 
-	kfree(platform);
 	return 0;
 }
 
-- 
2.35.0.rc2.247.g8bbb082509-goog

[PATCH v6 3/4] drm/bridge: anx7625: Support reading edid through aux channel

[Hsin-Yi Wang]

Support reading edid through aux channel if panel is connected to aux
bus. Extend anx7625_aux_dpcd_trans() to implement aux transfer function:

1. panel is populated in devm_of_dp_aux_populate_ep_devices(), so move
   anx7625_parse_dt() after.
2. Use pm runtime autosuspend since aux transfer function is called
   multiple times when reading edid.
3. No-op if aux transfer length is 0.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Xin Ji <xji@analogixsemi.com>
---
v5->v6:
fix Kconfig.
v4->v5:
fix header and indent.
v3->v4:
rebase to latest drm-misc-next
---
 drivers/gpu/drm/bridge/analogix/Kconfig   |   1 +
 drivers/gpu/drm/bridge/analogix/anx7625.c | 120 ++++++++++++++++++----
 drivers/gpu/drm/bridge/analogix/anx7625.h |   1 +
 3 files changed, 104 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig
index 319ba0df57be8f..03d3aaa2e84b37 100644
--- a/drivers/gpu/drm/bridge/analogix/Kconfig
+++ b/drivers/gpu/drm/bridge/analogix/Kconfig
@@ -32,6 +32,7 @@ config DRM_ANALOGIX_ANX7625
 	tristate "Analogix Anx7625 MIPI to DP interface support"
 	depends on DRM
 	depends on OF
+	select DRM_DP_AUX_BUS
 	select DRM_MIPI_DSI
 	help
 	  ANX7625 is an ultra-low power 4K mobile HD transmitter
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index b7e3373994b480..a59a4f4d2c5b10 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -24,6 +24,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/dp/drm_dp_aux_bus.h>
 #include <drm/dp/drm_dp_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_hdcp.h>
@@ -231,19 +232,23 @@ static int wait_aux_op_finish(struct anx7625_data *ctx)
 	return 0;
 }
 
-static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
-				  u32 address, u8 len, u8 *buf)
+static int anx7625_aux_trans(struct anx7625_data *ctx, u8 op, u32 address,
+			     u8 len, u8 *buf)
 {
 	struct device *dev = &ctx->client->dev;
 	int ret;
 	u8 addrh, addrm, addrl;
 	u8 cmd;
+	bool is_write = !(op & DP_AUX_I2C_READ);
 
-	if (len > MAX_DPCD_BUFFER_SIZE) {
+	if (len > DP_AUX_MAX_PAYLOAD_BYTES) {
 		dev_err(dev, "exceed aux buffer len.\n");
 		return -EINVAL;
 	}
 
+	if (!len)
+		return len;
+
 	addrl = address & 0xFF;
 	addrm = (address >> 8) & 0xFF;
 	addrh = (address >> 16) & 0xFF;
@@ -262,7 +267,7 @@ static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
 	ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
 				 AP_AUX_ADDR_19_16, addrh);
 
-	if (op == DP_AUX_NATIVE_WRITE)
+	if (is_write)
 		ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
 					       AP_AUX_BUFF_START, len, buf);
 	/* Enable aux access */
@@ -275,14 +280,14 @@ static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
 	}
 
 	ret = wait_aux_op_finish(ctx);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(dev, "aux IO error: wait aux op finish.\n");
 		return ret;
 	}
 
 	/* Write done */
-	if (op == DP_AUX_NATIVE_WRITE)
-		return 0;
+	if (is_write)
+		return len;
 
 	/* Read done, read out dpcd data */
 	ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
@@ -292,7 +297,7 @@ static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
 		return -EIO;
 	}
 
-	return 0;
+	return len;
 }
 
 static int anx7625_video_mute_control(struct anx7625_data *ctx,
@@ -867,7 +872,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx)
 	}
 
 	/* Read downstream capability */
-	anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap);
+	anx7625_aux_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap);
 	if (!(bcap & 0x01)) {
 		pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
 		return 0;
@@ -956,7 +961,7 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
 	dev_dbg(dev, "notify downstream enter into standby\n");
 	/* Downstream monitor enter into standby mode */
 	data = 2;
-	ret |= anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
+	ret |= anx7625_aux_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
 	if (ret < 0)
 		DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
 
@@ -1655,11 +1660,56 @@ static int anx7625_parse_dt(struct device *dev,
 	return 0;
 }
 
+static bool anx7625_of_panel_on_aux_bus(struct device *dev)
+{
+	struct device_node *bus, *panel;
+
+	bus = of_get_child_by_name(dev->of_node, "aux-bus");
+	if (!bus)
+		return false;
+
+	panel = of_get_child_by_name(bus, "panel");
+	of_node_put(bus);
+	if (!panel)
+		return false;
+	of_node_put(panel);
+
+	return true;
+}
+
 static inline struct anx7625_data *bridge_to_anx7625(struct drm_bridge *bridge)
 {
 	return container_of(bridge, struct anx7625_data, bridge);
 }
 
+static ssize_t anx7625_aux_transfer(struct drm_dp_aux *aux,
+				    struct drm_dp_aux_msg *msg)
+{
+	struct anx7625_data *ctx = container_of(aux, struct anx7625_data, aux);
+	struct device *dev = &ctx->client->dev;
+	u8 request = msg->request & ~DP_AUX_I2C_MOT;
+	int ret = 0;
+
+	pm_runtime_get_sync(dev);
+	msg->reply = 0;
+	switch (request) {
+	case DP_AUX_NATIVE_WRITE:
+	case DP_AUX_I2C_WRITE:
+	case DP_AUX_NATIVE_READ:
+	case DP_AUX_I2C_READ:
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	if (!ret)
+		ret = anx7625_aux_trans(ctx, msg->request, msg->address,
+					msg->size, msg->buffer);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
+
+	return ret;
+}
+
 static struct edid *anx7625_get_edid(struct anx7625_data *ctx)
 {
 	struct device *dev = &ctx->client->dev;
@@ -2066,6 +2116,13 @@ static int anx7625_bridge_attach(struct drm_bridge *bridge,
 		return -ENODEV;
 	}
 
+	ctx->aux.drm_dev = bridge->dev;
+	err = drm_dp_aux_register(&ctx->aux);
+	if (err) {
+		dev_err(dev, "failed to register aux channel: %d\n", err);
+		return err;
+	}
+
 	if (ctx->pdata.panel_bridge) {
 		err = drm_bridge_attach(bridge->encoder,
 					ctx->pdata.panel_bridge,
@@ -2079,6 +2136,13 @@ static int anx7625_bridge_attach(struct drm_bridge *bridge,
 	return 0;
 }
 
+static void anx7625_bridge_detach(struct drm_bridge *bridge)
+{
+	struct anx7625_data *ctx = bridge_to_anx7625(bridge);
+
+	drm_dp_aux_unregister(&ctx->aux);
+}
+
 static enum drm_mode_status
 anx7625_bridge_mode_valid(struct drm_bridge *bridge,
 			  const struct drm_display_info *info,
@@ -2344,6 +2408,7 @@ static struct edid *anx7625_bridge_get_edid(struct drm_bridge *bridge,
 
 static const struct drm_bridge_funcs anx7625_bridge_funcs = {
 	.attach = anx7625_bridge_attach,
+	.detach = anx7625_bridge_detach,
 	.mode_valid = anx7625_bridge_mode_valid,
 	.mode_set = anx7625_bridge_mode_set,
 	.atomic_check = anx7625_bridge_atomic_check,
@@ -2501,6 +2566,12 @@ static const struct dev_pm_ops anx7625_pm_ops = {
 			   anx7625_runtime_pm_resume, NULL)
 };
 
+static void anx7625_runtime_disable(void *data)
+{
+	pm_runtime_dont_use_autosuspend(data);
+	pm_runtime_disable(data);
+}
+
 static int anx7625_i2c_probe(struct i2c_client *client,
 			     const struct i2c_device_id *id)
 {
@@ -2523,13 +2594,6 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 
 	pdata = &platform->pdata;
 
-	ret = anx7625_parse_dt(dev, pdata);
-	if (ret) {
-		if (ret != -EPROBE_DEFER)
-			DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret);
-		return ret;
-	}
-
 	platform->client = client;
 	i2c_set_clientdata(client, platform);
 
@@ -2577,6 +2641,19 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 		}
 	}
 
+	platform->aux.name = "anx7625-aux";
+	platform->aux.dev = dev;
+	platform->aux.transfer = anx7625_aux_transfer;
+	drm_dp_aux_init(&platform->aux);
+	devm_of_dp_aux_populate_ep_devices(&platform->aux);
+
+	ret = anx7625_parse_dt(dev, pdata);
+	if (ret) {
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "fail to parse DT : %d\n", ret);
+		return ret;
+	}
+
 	if (anx7625_register_i2c_dummy_clients(platform, client) != 0) {
 		ret = -ENOMEM;
 		DRM_DEV_ERROR(dev, "fail to reserve I2C bus.\n");
@@ -2584,6 +2661,12 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	}
 
 	pm_runtime_enable(dev);
+	pm_runtime_set_autosuspend_delay(dev, 1000);
+	pm_runtime_use_autosuspend(dev);
+	pm_suspend_ignore_children(dev, true);
+	ret = devm_add_action_or_reset(dev, anx7625_runtime_disable, dev);
+	if (ret)
+		return ret;
 
 	if (!platform->pdata.low_power_mode) {
 		anx7625_disable_pd_protocol(platform);
@@ -2596,7 +2679,8 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 
 	platform->bridge.funcs = &anx7625_bridge_funcs;
 	platform->bridge.of_node = client->dev.of_node;
-	platform->bridge.ops = DRM_BRIDGE_OP_EDID;
+	if (!anx7625_of_panel_on_aux_bus(&client->dev))
+		platform->bridge.ops |= DRM_BRIDGE_OP_EDID;
 	if (!platform->pdata.panel_bridge)
 		platform->bridge.ops |= DRM_BRIDGE_OP_HPD |
 					DRM_BRIDGE_OP_DETECT;
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 64a8ab56529404..edbbfe410a56e8 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -472,6 +472,7 @@ struct anx7625_data {
 	u8 bridge_attached;
 	struct drm_connector *connector;
 	struct mipi_dsi_device *dsi;
+	struct drm_dp_aux aux;
 };
 
 #endif  /* __ANX7625_H__ */
-- 
2.35.0.rc2.247.g8bbb082509-goog

[PATCH v6 4/4] dt-bindings: drm/bridge: anx7625: Add aux-bus node

[Hsin-Yi Wang]

List panel under aux-bus node if it's connected to anx7625's aux bus.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
 .../display/bridge/analogix,anx7625.yaml        | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
index 1d3e88daca041a..0d38d6fe39830f 100644
--- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
@@ -83,6 +83,9 @@ properties:
     type: boolean
     description: let the driver enable audio HDMI codec function or not.
 
+  aux-bus:
+    $ref: /schemas/display/dp-aux-bus.yaml#
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
 
@@ -167,5 +170,19 @@ examples:
                     };
                 };
             };
+
+            aux-bus {
+                panel {
+                    compatible = "innolux,n125hce-gn1";
+                    power-supply = <&pp3300_disp_x>;
+                    backlight = <&backlight_lcd0>;
+
+                    port {
+                        panel_in: endpoint {
+                            remote-endpoint = <&anx7625_out>;
+                        };
+                    };
+                };
+            };
         };
     };
-- 
2.35.0.rc2.247.g8bbb082509-goog

Re: [PATCH v6 4/4] dt-bindings: drm/bridge: anx7625: Add aux-bus node

[Rob Herring]

On Thu, 03 Feb 2022 22:10:23 +0800, Hsin-Yi Wang wrote:
> List panel under aux-bus node if it's connected to anx7625's aux bus.
> 
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
>  .../display/bridge/analogix,anx7625.yaml        | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v6 3/4] drm/bridge: anx7625: Support reading edid through aux channel

[kernel test robot]

Hi Hsin-Yi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm/drm-next]
[cannot apply to robh/for-next drm-intel/for-linux-next v5.17-rc2]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Hsin-Yi-Wang/drm-bridge-anx7625-send-DPCD-command-to-downstream/20220203-221108
base:   git://anongit.freedesktop.org/drm/drm drm-next
config: arm64-randconfig-c023-20220130 (https://download.01.org/0day-ci/archive/20220205/202202050942.C6c0MD0r-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/45f3728b61c8cb8d53d13d88c33c4f58630dcea6
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Hsin-Yi-Wang/drm-bridge-anx7625-send-DPCD-command-to-downstream/20220203-221108
        git checkout 45f3728b61c8cb8d53d13d88c33c4f58630dcea6
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   aarch64-linux-ld: Unexpected GOT/PLT entries detected!
   aarch64-linux-ld: Unexpected run-time procedure linkages detected!
   aarch64-linux-ld: ID map text too big or misaligned
   aarch64-linux-ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_bridge_detach':
>> anx7625.c:(.text+0x5e0): undefined reference to `drm_dp_aux_unregister'
   aarch64-linux-ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_bridge_attach':
>> anx7625.c:(.text+0x674): undefined reference to `drm_dp_aux_register'
   aarch64-linux-ld: drivers/gpu/drm/bridge/analogix/anx7625.o: in function `anx7625_i2c_probe':
>> anx7625.c:(.text+0x1b48): undefined reference to `drm_dp_aux_init'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org