[PATCH v2 0/3] drm/mediatek: Don't support hdmi connector creation

[PATCH v2 0/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
broke the display support for elm device since mtk_dpi calls
drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
while mtk_hdmi does not yet support this flag.

These three patches fix that by adding support for DRM_BRIDGE_ATTACH_NO_CONNECTOR
in mtk_hdmi bridge attachment.

changes since v1:
1. split the first patch - now the first patch only moves the bridge ops to the atomic API
while the replacement of the field 'conn' with the field '*curr_conn' is done in a new third patch.
2. in the function 'get_eld' use the current conn only if 'enabled = true'.

Dafna Hirschfeld (3):
  drm/mediatek: Switch the hdmi bridge ops to the atomic versions
  drm/mediatek: Don't support hdmi connector creation
  drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn
    ptr

 drivers/gpu/drm/mediatek/mtk_hdmi.c | 171 ++++++++++++----------------
 1 file changed, 73 insertions(+), 98 deletions(-)

-- 
2.17.1

[PATCH v2 0/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
broke the display support for elm device since mtk_dpi calls
drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
while mtk_hdmi does not yet support this flag.

These three patches fix that by adding support for DRM_BRIDGE_ATTACH_NO_CONNECTOR
in mtk_hdmi bridge attachment.

changes since v1:
1. split the first patch - now the first patch only moves the bridge ops to the atomic API
while the replacement of the field 'conn' with the field '*curr_conn' is done in a new third patch.
2. in the function 'get_eld' use the current conn only if 'enabled = true'.

Dafna Hirschfeld (3):
  drm/mediatek: Switch the hdmi bridge ops to the atomic versions
  drm/mediatek: Don't support hdmi connector creation
  drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn
    ptr

 drivers/gpu/drm/mediatek/mtk_hdmi.c | 171 ++++++++++++----------------
 1 file changed, 73 insertions(+), 98 deletions(-)

-- 
2.17.1


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[PATCH v2 0/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
broke the display support for elm device since mtk_dpi calls
drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
while mtk_hdmi does not yet support this flag.

These three patches fix that by adding support for DRM_BRIDGE_ATTACH_NO_CONNECTOR
in mtk_hdmi bridge attachment.

changes since v1:
1. split the first patch - now the first patch only moves the bridge ops to the atomic API
while the replacement of the field 'conn' with the field '*curr_conn' is done in a new third patch.
2. in the function 'get_eld' use the current conn only if 'enabled = true'.

Dafna Hirschfeld (3):
  drm/mediatek: Switch the hdmi bridge ops to the atomic versions
  drm/mediatek: Don't support hdmi connector creation
  drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn
    ptr

 drivers/gpu/drm/mediatek/mtk_hdmi.c | 171 ++++++++++++----------------
 1 file changed, 73 insertions(+), 98 deletions(-)

-- 
2.17.1

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[PATCH v2 1/3] drm/mediatek: Switch the hdmi bridge ops to the atomic versions

[Dafna Hirschfeld]

The bridge operation '.enable' and the audio cb '.get_eld'
access hdmi->conn. In the future we will want to support
the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR and then we will
not have direct access to the connector.
The atomic version '.atomic_enable' allows accessing the
current connector from the state.
This patch switches the bridge to the atomic version to
prepare access to the connector in later patches.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 8ee55f9e2954..f2c810b767ef 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1357,7 +1357,8 @@ static bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
 	return true;
 }
 
-static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
+					   struct drm_bridge_state *old_bridge_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1371,7 +1372,8 @@ static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
 	hdmi->enabled = false;
 }
 
-static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
+						struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1406,7 +1408,8 @@ static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
 	drm_mode_copy(&hdmi->mode, adjusted_mode);
 }
 
-static void mtk_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+					      struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1426,7 +1429,8 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
 		mtk_hdmi_setup_vendor_specific_infoframe(hdmi, mode);
 }
 
-static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
+					  struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1440,13 +1444,16 @@ static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
 }
 
 static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.attach = mtk_hdmi_bridge_attach,
 	.mode_fixup = mtk_hdmi_bridge_mode_fixup,
-	.disable = mtk_hdmi_bridge_disable,
-	.post_disable = mtk_hdmi_bridge_post_disable,
+	.atomic_disable = mtk_hdmi_bridge_atomic_disable,
+	.atomic_post_disable = mtk_hdmi_bridge_atomic_post_disable,
 	.mode_set = mtk_hdmi_bridge_mode_set,
-	.pre_enable = mtk_hdmi_bridge_pre_enable,
-	.enable = mtk_hdmi_bridge_enable,
+	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
+	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
 };
 
 static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
-- 
2.17.1

[PATCH v2 1/3] drm/mediatek: Switch the hdmi bridge ops to the atomic versions

[Dafna Hirschfeld]

The bridge operation '.enable' and the audio cb '.get_eld'
access hdmi->conn. In the future we will want to support
the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR and then we will
not have direct access to the connector.
The atomic version '.atomic_enable' allows accessing the
current connector from the state.
This patch switches the bridge to the atomic version to
prepare access to the connector in later patches.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 8ee55f9e2954..f2c810b767ef 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1357,7 +1357,8 @@ static bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
 	return true;
 }
 
-static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
+					   struct drm_bridge_state *old_bridge_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1371,7 +1372,8 @@ static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
 	hdmi->enabled = false;
 }
 
-static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
+						struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1406,7 +1408,8 @@ static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
 	drm_mode_copy(&hdmi->mode, adjusted_mode);
 }
 
-static void mtk_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+					      struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1426,7 +1429,8 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
 		mtk_hdmi_setup_vendor_specific_infoframe(hdmi, mode);
 }
 
-static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
+					  struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1440,13 +1444,16 @@ static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
 }
 
 static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.attach = mtk_hdmi_bridge_attach,
 	.mode_fixup = mtk_hdmi_bridge_mode_fixup,
-	.disable = mtk_hdmi_bridge_disable,
-	.post_disable = mtk_hdmi_bridge_post_disable,
+	.atomic_disable = mtk_hdmi_bridge_atomic_disable,
+	.atomic_post_disable = mtk_hdmi_bridge_atomic_post_disable,
 	.mode_set = mtk_hdmi_bridge_mode_set,
-	.pre_enable = mtk_hdmi_bridge_pre_enable,
-	.enable = mtk_hdmi_bridge_enable,
+	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
+	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
 };
 
 static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
-- 
2.17.1


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Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

[PATCH v2 1/3] drm/mediatek: Switch the hdmi bridge ops to the atomic versions

[Dafna Hirschfeld]

The bridge operation '.enable' and the audio cb '.get_eld'
access hdmi->conn. In the future we will want to support
the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR and then we will
not have direct access to the connector.
The atomic version '.atomic_enable' allows accessing the
current connector from the state.
This patch switches the bridge to the atomic version to
prepare access to the connector in later patches.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 8ee55f9e2954..f2c810b767ef 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1357,7 +1357,8 @@ static bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
 	return true;
 }
 
-static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
+					   struct drm_bridge_state *old_bridge_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1371,7 +1372,8 @@ static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
 	hdmi->enabled = false;
 }
 
-static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
+						struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1406,7 +1408,8 @@ static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
 	drm_mode_copy(&hdmi->mode, adjusted_mode);
 }
 
-static void mtk_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+					      struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1426,7 +1429,8 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
 		mtk_hdmi_setup_vendor_specific_infoframe(hdmi, mode);
 }
 
-static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
+static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
+					  struct drm_bridge_state *old_state)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
@@ -1440,13 +1444,16 @@ static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
 }
 
 static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.attach = mtk_hdmi_bridge_attach,
 	.mode_fixup = mtk_hdmi_bridge_mode_fixup,
-	.disable = mtk_hdmi_bridge_disable,
-	.post_disable = mtk_hdmi_bridge_post_disable,
+	.atomic_disable = mtk_hdmi_bridge_atomic_disable,
+	.atomic_post_disable = mtk_hdmi_bridge_atomic_post_disable,
 	.mode_set = mtk_hdmi_bridge_mode_set,
-	.pre_enable = mtk_hdmi_bridge_pre_enable,
-	.enable = mtk_hdmi_bridge_enable,
+	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
+	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
 };
 
 static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
-- 
2.17.1

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[PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
broke the display support for elm device since mtk_dpi calls
drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
while mtk_hdmi does not yet support this flag.

Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
call drm_bridge_hpd_notify() to report HPD. This provides the
necessary API to support disabling connector creation.

This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
But with the difference that in mtk-hdmi only the option of not creating
a connector is supported.

Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
 1 file changed, 44 insertions(+), 85 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index f2c810b767ef..1eeb211b1536 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
 	return container_of(b, struct mtk_hdmi, bridge);
 }
 
-static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
-{
-	return container_of(c, struct mtk_hdmi, conn);
-}
-
 static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
 {
 	return readl(hdmi->regs + offset);
@@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
 	       connector_status_connected : connector_status_disconnected;
 }
 
-static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
-						  bool force)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-	return mtk_hdmi_update_plugged_status(hdmi);
-}
-
-static void hdmi_conn_destroy(struct drm_connector *conn)
+static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
+				      struct drm_connector *connector)
 {
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-
-	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
-
-	drm_connector_cleanup(conn);
-}
-
-static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
 	struct edid *edid;
-	int ret;
 
 	if (!hdmi->ddc_adpt)
-		return -ENODEV;
-
-	edid = drm_get_edid(conn, hdmi->ddc_adpt);
+		return NULL;
+	edid = drm_get_edid(connector, hdmi->ddc_adpt);
 	if (!edid)
-		return -ENODEV;
-
+		return NULL;
 	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
+	return edid;
+}
 
-	drm_connector_update_edid_property(conn, edid);
-
-	ret = drm_add_edid_modes(conn, edid);
-	kfree(edid);
-	return ret;
+static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
+{
+	return mtk_hdmi_update_plugged_status(hdmi);
 }
 
-static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
-				    struct drm_display_mode *mode)
+static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
+				      const struct drm_display_info *info,
+				      const struct drm_display_mode *mode)
 {
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 	struct drm_bridge *next_bridge;
 
 	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
@@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
 	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
 }
 
-static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-
-	return hdmi->bridge.encoder;
-}
-
-static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
-	.detect = hdmi_conn_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = hdmi_conn_destroy,
-	.reset = drm_atomic_helper_connector_reset,
-	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
-static const struct drm_connector_helper_funcs
-		mtk_hdmi_connector_helper_funcs = {
-	.get_modes = mtk_hdmi_conn_get_modes,
-	.mode_valid = mtk_hdmi_conn_mode_valid,
-	.best_encoder = mtk_hdmi_conn_best_enc,
-};
-
 static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
+	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
+		static enum drm_connector_status status;
+
+		status = mtk_hdmi_detect(hdmi);
 		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
+		drm_bridge_hpd_notify(&hdmi->bridge, status);
+	}
 }
 
 /*
  * Bridge callbacks
  */
 
+static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
+{
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
+
+	return mtk_hdmi_detect(hdmi);
+}
+
+static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
+					     struct drm_connector *connector)
+{
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
+
+	return mtk_hdmi_get_edid(hdmi, connector);
+}
+
 static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
 				  enum drm_bridge_attach_flags flags)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 	int ret;
 
-	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
-		DRM_ERROR("Fix bridge driver to make connector optional!");
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
+			  __func__);
 		return -EINVAL;
 	}
 
-	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
-					  &mtk_hdmi_connector_funcs,
-					  DRM_MODE_CONNECTOR_HDMIA,
-					  hdmi->ddc_adpt);
-	if (ret) {
-		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
-		return ret;
-	}
-	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
-
-	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
-	hdmi->conn.interlace_allowed = true;
-	hdmi->conn.doublescan_allowed = false;
-
-	ret = drm_connector_attach_encoder(&hdmi->conn,
-						bridge->encoder);
-	if (ret) {
-		dev_err(hdmi->dev,
-			"Failed to attach connector to encoder: %d\n", ret);
-		return ret;
-	}
-
 	if (hdmi->next_bridge) {
 		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
 					bridge, flags);
@@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 }
 
 static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
+	.mode_valid = mtk_hdmi_bridge_mode_valid,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
@@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
 	.mode_set = mtk_hdmi_bridge_mode_set,
 	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
 	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
+	.detect = mtk_hdmi_bridge_detect,
+	.get_edid = mtk_hdmi_bridge_get_edid,
 };
 
 static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
@@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
 
 	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
 	hdmi->bridge.of_node = pdev->dev.of_node;
+	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
+			   | DRM_BRIDGE_OP_HPD;
+	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 	drm_bridge_add(&hdmi->bridge);
 
 	ret = mtk_hdmi_clk_enable_audio(hdmi);
-- 
2.17.1

[PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
broke the display support for elm device since mtk_dpi calls
drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
while mtk_hdmi does not yet support this flag.

Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
call drm_bridge_hpd_notify() to report HPD. This provides the
necessary API to support disabling connector creation.

This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
But with the difference that in mtk-hdmi only the option of not creating
a connector is supported.

Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
 1 file changed, 44 insertions(+), 85 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index f2c810b767ef..1eeb211b1536 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
 	return container_of(b, struct mtk_hdmi, bridge);
 }
 
-static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
-{
-	return container_of(c, struct mtk_hdmi, conn);
-}
-
 static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
 {
 	return readl(hdmi->regs + offset);
@@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
 	       connector_status_connected : connector_status_disconnected;
 }
 
-static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
-						  bool force)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-	return mtk_hdmi_update_plugged_status(hdmi);
-}
-
-static void hdmi_conn_destroy(struct drm_connector *conn)
+static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
+				      struct drm_connector *connector)
 {
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-
-	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
-
-	drm_connector_cleanup(conn);
-}
-
-static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
 	struct edid *edid;
-	int ret;
 
 	if (!hdmi->ddc_adpt)
-		return -ENODEV;
-
-	edid = drm_get_edid(conn, hdmi->ddc_adpt);
+		return NULL;
+	edid = drm_get_edid(connector, hdmi->ddc_adpt);
 	if (!edid)
-		return -ENODEV;
-
+		return NULL;
 	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
+	return edid;
+}
 
-	drm_connector_update_edid_property(conn, edid);
-
-	ret = drm_add_edid_modes(conn, edid);
-	kfree(edid);
-	return ret;
+static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
+{
+	return mtk_hdmi_update_plugged_status(hdmi);
 }
 
-static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
-				    struct drm_display_mode *mode)
+static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
+				      const struct drm_display_info *info,
+				      const struct drm_display_mode *mode)
 {
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 	struct drm_bridge *next_bridge;
 
 	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
@@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
 	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
 }
 
-static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-
-	return hdmi->bridge.encoder;
-}
-
-static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
-	.detect = hdmi_conn_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = hdmi_conn_destroy,
-	.reset = drm_atomic_helper_connector_reset,
-	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
-static const struct drm_connector_helper_funcs
-		mtk_hdmi_connector_helper_funcs = {
-	.get_modes = mtk_hdmi_conn_get_modes,
-	.mode_valid = mtk_hdmi_conn_mode_valid,
-	.best_encoder = mtk_hdmi_conn_best_enc,
-};
-
 static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
+	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
+		static enum drm_connector_status status;
+
+		status = mtk_hdmi_detect(hdmi);
 		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
+		drm_bridge_hpd_notify(&hdmi->bridge, status);
+	}
 }
 
 /*
  * Bridge callbacks
  */
 
+static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
+{
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
+
+	return mtk_hdmi_detect(hdmi);
+}
+
+static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
+					     struct drm_connector *connector)
+{
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
+
+	return mtk_hdmi_get_edid(hdmi, connector);
+}
+
 static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
 				  enum drm_bridge_attach_flags flags)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 	int ret;
 
-	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
-		DRM_ERROR("Fix bridge driver to make connector optional!");
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
+			  __func__);
 		return -EINVAL;
 	}
 
-	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
-					  &mtk_hdmi_connector_funcs,
-					  DRM_MODE_CONNECTOR_HDMIA,
-					  hdmi->ddc_adpt);
-	if (ret) {
-		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
-		return ret;
-	}
-	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
-
-	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
-	hdmi->conn.interlace_allowed = true;
-	hdmi->conn.doublescan_allowed = false;
-
-	ret = drm_connector_attach_encoder(&hdmi->conn,
-						bridge->encoder);
-	if (ret) {
-		dev_err(hdmi->dev,
-			"Failed to attach connector to encoder: %d\n", ret);
-		return ret;
-	}
-
 	if (hdmi->next_bridge) {
 		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
 					bridge, flags);
@@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 }
 
 static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
+	.mode_valid = mtk_hdmi_bridge_mode_valid,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
@@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
 	.mode_set = mtk_hdmi_bridge_mode_set,
 	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
 	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
+	.detect = mtk_hdmi_bridge_detect,
+	.get_edid = mtk_hdmi_bridge_get_edid,
 };
 
 static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
@@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
 
 	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
 	hdmi->bridge.of_node = pdev->dev.of_node;
+	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
+			   | DRM_BRIDGE_OP_HPD;
+	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 	drm_bridge_add(&hdmi->bridge);
 
 	ret = mtk_hdmi_clk_enable_audio(hdmi);
-- 
2.17.1


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

[PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
broke the display support for elm device since mtk_dpi calls
drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
while mtk_hdmi does not yet support this flag.

Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
call drm_bridge_hpd_notify() to report HPD. This provides the
necessary API to support disabling connector creation.

This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
But with the difference that in mtk-hdmi only the option of not creating
a connector is supported.

Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
 1 file changed, 44 insertions(+), 85 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index f2c810b767ef..1eeb211b1536 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
 	return container_of(b, struct mtk_hdmi, bridge);
 }
 
-static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
-{
-	return container_of(c, struct mtk_hdmi, conn);
-}
-
 static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
 {
 	return readl(hdmi->regs + offset);
@@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
 	       connector_status_connected : connector_status_disconnected;
 }
 
-static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
-						  bool force)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-	return mtk_hdmi_update_plugged_status(hdmi);
-}
-
-static void hdmi_conn_destroy(struct drm_connector *conn)
+static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
+				      struct drm_connector *connector)
 {
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-
-	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
-
-	drm_connector_cleanup(conn);
-}
-
-static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
 	struct edid *edid;
-	int ret;
 
 	if (!hdmi->ddc_adpt)
-		return -ENODEV;
-
-	edid = drm_get_edid(conn, hdmi->ddc_adpt);
+		return NULL;
+	edid = drm_get_edid(connector, hdmi->ddc_adpt);
 	if (!edid)
-		return -ENODEV;
-
+		return NULL;
 	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
+	return edid;
+}
 
-	drm_connector_update_edid_property(conn, edid);
-
-	ret = drm_add_edid_modes(conn, edid);
-	kfree(edid);
-	return ret;
+static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
+{
+	return mtk_hdmi_update_plugged_status(hdmi);
 }
 
-static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
-				    struct drm_display_mode *mode)
+static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
+				      const struct drm_display_info *info,
+				      const struct drm_display_mode *mode)
 {
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 	struct drm_bridge *next_bridge;
 
 	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
@@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
 	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
 }
 
-static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
-{
-	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
-
-	return hdmi->bridge.encoder;
-}
-
-static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
-	.detect = hdmi_conn_detect,
-	.fill_modes = drm_helper_probe_single_connector_modes,
-	.destroy = hdmi_conn_destroy,
-	.reset = drm_atomic_helper_connector_reset,
-	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
-static const struct drm_connector_helper_funcs
-		mtk_hdmi_connector_helper_funcs = {
-	.get_modes = mtk_hdmi_conn_get_modes,
-	.mode_valid = mtk_hdmi_conn_mode_valid,
-	.best_encoder = mtk_hdmi_conn_best_enc,
-};
-
 static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
+	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
+		static enum drm_connector_status status;
+
+		status = mtk_hdmi_detect(hdmi);
 		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
+		drm_bridge_hpd_notify(&hdmi->bridge, status);
+	}
 }
 
 /*
  * Bridge callbacks
  */
 
+static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
+{
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
+
+	return mtk_hdmi_detect(hdmi);
+}
+
+static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
+					     struct drm_connector *connector)
+{
+	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
+
+	return mtk_hdmi_get_edid(hdmi, connector);
+}
+
 static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
 				  enum drm_bridge_attach_flags flags)
 {
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 	int ret;
 
-	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
-		DRM_ERROR("Fix bridge driver to make connector optional!");
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
+			  __func__);
 		return -EINVAL;
 	}
 
-	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
-					  &mtk_hdmi_connector_funcs,
-					  DRM_MODE_CONNECTOR_HDMIA,
-					  hdmi->ddc_adpt);
-	if (ret) {
-		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
-		return ret;
-	}
-	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
-
-	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
-	hdmi->conn.interlace_allowed = true;
-	hdmi->conn.doublescan_allowed = false;
-
-	ret = drm_connector_attach_encoder(&hdmi->conn,
-						bridge->encoder);
-	if (ret) {
-		dev_err(hdmi->dev,
-			"Failed to attach connector to encoder: %d\n", ret);
-		return ret;
-	}
-
 	if (hdmi->next_bridge) {
 		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
 					bridge, flags);
@@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 }
 
 static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
+	.mode_valid = mtk_hdmi_bridge_mode_valid,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
@@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
 	.mode_set = mtk_hdmi_bridge_mode_set,
 	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
 	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
+	.detect = mtk_hdmi_bridge_detect,
+	.get_edid = mtk_hdmi_bridge_get_edid,
 };
 
 static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
@@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
 
 	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
 	hdmi->bridge.of_node = pdev->dev.of_node;
+	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
+			   | DRM_BRIDGE_OP_HPD;
+	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 	drm_bridge_add(&hdmi->bridge);
 
 	ret = mtk_hdmi_clk_enable_audio(hdmi);
-- 
2.17.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v2 3/3] drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn ptr

[Dafna Hirschfeld]

The mtk_hdmi does not support creating a bridge with a connector.
Therefore the field 'conn' should be removed from the mtk_hdmi struct.
It is replaced with a pointer curr_conn that points to the current
connector which can be access through the global state.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 1eeb211b1536..0d95d2cfe3de 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -153,7 +153,7 @@ struct mtk_hdmi_conf {
 struct mtk_hdmi {
 	struct drm_bridge bridge;
 	struct drm_bridge *next_bridge;
-	struct drm_connector conn;
+	struct drm_connector *curr_conn;/* current connector (only valid when 'enabled') */
 	struct device *dev;
 	const struct mtk_hdmi_conf *conf;
 	struct phy *phy;
@@ -969,7 +969,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
 	ssize_t err;
 
 	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
-						       &hdmi->conn, mode);
+						       hdmi->curr_conn, mode);
 	if (err < 0) {
 		dev_err(hdmi->dev,
 			"Failed to get AVI infoframe from mode: %zd\n", err);
@@ -1049,7 +1049,7 @@ static int mtk_hdmi_setup_vendor_specific_infoframe(struct mtk_hdmi *hdmi,
 	ssize_t err;
 
 	err = drm_hdmi_vendor_infoframe_from_display_mode(&frame,
-							  &hdmi->conn, mode);
+							  hdmi->curr_conn, mode);
 	if (err) {
 		dev_err(hdmi->dev,
 			"Failed to get vendor infoframe from mode: %zd\n", err);
@@ -1322,6 +1322,8 @@ static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
 	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
 	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
 
+	hdmi->curr_conn = NULL;
+
 	hdmi->enabled = false;
 }
 
@@ -1385,8 +1387,13 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
 static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 					  struct drm_bridge_state *old_state)
 {
+	struct drm_atomic_state *state = old_state->base.state;
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
+	/* Retrieve the connector through the atomic state. */
+	hdmi->curr_conn = drm_atomic_get_new_connector_for_encoder(state,
+								   bridge->encoder);
+
 	mtk_hdmi_output_set_display_mode(hdmi, &hdmi->mode);
 	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
 	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
@@ -1625,8 +1632,10 @@ static int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-	memcpy(buf, hdmi->conn.eld, min(sizeof(hdmi->conn.eld), len));
-
+	if (hdmi->enabled)
+		memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
+	else
+		memset(buf, 0, len);
 	return 0;
 }
 
-- 
2.17.1

[PATCH v2 3/3] drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn ptr

[Dafna Hirschfeld]

The mtk_hdmi does not support creating a bridge with a connector.
Therefore the field 'conn' should be removed from the mtk_hdmi struct.
It is replaced with a pointer curr_conn that points to the current
connector which can be access through the global state.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 1eeb211b1536..0d95d2cfe3de 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -153,7 +153,7 @@ struct mtk_hdmi_conf {
 struct mtk_hdmi {
 	struct drm_bridge bridge;
 	struct drm_bridge *next_bridge;
-	struct drm_connector conn;
+	struct drm_connector *curr_conn;/* current connector (only valid when 'enabled') */
 	struct device *dev;
 	const struct mtk_hdmi_conf *conf;
 	struct phy *phy;
@@ -969,7 +969,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
 	ssize_t err;
 
 	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
-						       &hdmi->conn, mode);
+						       hdmi->curr_conn, mode);
 	if (err < 0) {
 		dev_err(hdmi->dev,
 			"Failed to get AVI infoframe from mode: %zd\n", err);
@@ -1049,7 +1049,7 @@ static int mtk_hdmi_setup_vendor_specific_infoframe(struct mtk_hdmi *hdmi,
 	ssize_t err;
 
 	err = drm_hdmi_vendor_infoframe_from_display_mode(&frame,
-							  &hdmi->conn, mode);
+							  hdmi->curr_conn, mode);
 	if (err) {
 		dev_err(hdmi->dev,
 			"Failed to get vendor infoframe from mode: %zd\n", err);
@@ -1322,6 +1322,8 @@ static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
 	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
 	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
 
+	hdmi->curr_conn = NULL;
+
 	hdmi->enabled = false;
 }
 
@@ -1385,8 +1387,13 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
 static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 					  struct drm_bridge_state *old_state)
 {
+	struct drm_atomic_state *state = old_state->base.state;
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
+	/* Retrieve the connector through the atomic state. */
+	hdmi->curr_conn = drm_atomic_get_new_connector_for_encoder(state,
+								   bridge->encoder);
+
 	mtk_hdmi_output_set_display_mode(hdmi, &hdmi->mode);
 	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
 	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
@@ -1625,8 +1632,10 @@ static int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-	memcpy(buf, hdmi->conn.eld, min(sizeof(hdmi->conn.eld), len));
-
+	if (hdmi->enabled)
+		memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
+	else
+		memset(buf, 0, len);
 	return 0;
 }
 
-- 
2.17.1


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-mediatek

[PATCH v2 3/3] drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn ptr

[Dafna Hirschfeld]

The mtk_hdmi does not support creating a bridge with a connector.
Therefore the field 'conn' should be removed from the mtk_hdmi struct.
It is replaced with a pointer curr_conn that points to the current
connector which can be access through the global state.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 1eeb211b1536..0d95d2cfe3de 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -153,7 +153,7 @@ struct mtk_hdmi_conf {
 struct mtk_hdmi {
 	struct drm_bridge bridge;
 	struct drm_bridge *next_bridge;
-	struct drm_connector conn;
+	struct drm_connector *curr_conn;/* current connector (only valid when 'enabled') */
 	struct device *dev;
 	const struct mtk_hdmi_conf *conf;
 	struct phy *phy;
@@ -969,7 +969,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
 	ssize_t err;
 
 	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
-						       &hdmi->conn, mode);
+						       hdmi->curr_conn, mode);
 	if (err < 0) {
 		dev_err(hdmi->dev,
 			"Failed to get AVI infoframe from mode: %zd\n", err);
@@ -1049,7 +1049,7 @@ static int mtk_hdmi_setup_vendor_specific_infoframe(struct mtk_hdmi *hdmi,
 	ssize_t err;
 
 	err = drm_hdmi_vendor_infoframe_from_display_mode(&frame,
-							  &hdmi->conn, mode);
+							  hdmi->curr_conn, mode);
 	if (err) {
 		dev_err(hdmi->dev,
 			"Failed to get vendor infoframe from mode: %zd\n", err);
@@ -1322,6 +1322,8 @@ static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
 	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
 	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
 
+	hdmi->curr_conn = NULL;
+
 	hdmi->enabled = false;
 }
 
@@ -1385,8 +1387,13 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
 static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 					  struct drm_bridge_state *old_state)
 {
+	struct drm_atomic_state *state = old_state->base.state;
 	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
 
+	/* Retrieve the connector through the atomic state. */
+	hdmi->curr_conn = drm_atomic_get_new_connector_for_encoder(state,
+								   bridge->encoder);
+
 	mtk_hdmi_output_set_display_mode(hdmi, &hdmi->mode);
 	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
 	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
@@ -1625,8 +1632,10 @@ static int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-	memcpy(buf, hdmi->conn.eld, min(sizeof(hdmi->conn.eld), len));
-
+	if (hdmi->enabled)
+		memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
+	else
+		memset(buf, 0, len);
 	return 0;
 }
 
-- 
2.17.1

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Re: [PATCH v2 1/3] drm/mediatek: Switch the hdmi bridge ops to the atomic versions

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:30PM +0200, Dafna Hirschfeld wrote:
> The bridge operation '.enable' and the audio cb '.get_eld'
> access hdmi->conn. In the future we will want to support
> the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR and then we will
> not have direct access to the connector.
> The atomic version '.atomic_enable' allows accessing the
> current connector from the state.
> This patch switches the bridge to the atomic version to
> prepare access to the connector in later patches.
> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 8ee55f9e2954..f2c810b767ef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1357,7 +1357,8 @@ static bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
>  	return true;
>  }
>  
> -static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
> +					   struct drm_bridge_state *old_bridge_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1371,7 +1372,8 @@ static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
>  	hdmi->enabled = false;
>  }
>  
> -static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
> +						struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1406,7 +1408,8 @@ static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
>  	drm_mode_copy(&hdmi->mode, adjusted_mode);
>  }
>  
> -static void mtk_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
> +					      struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1426,7 +1429,8 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
>  		mtk_hdmi_setup_vendor_specific_infoframe(hdmi, mode);
>  }
>  
> -static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
> +					  struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1440,13 +1444,16 @@ static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
>  }
>  
>  static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> +	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> +	.atomic_reset = drm_atomic_helper_bridge_reset,
>  	.attach = mtk_hdmi_bridge_attach,
>  	.mode_fixup = mtk_hdmi_bridge_mode_fixup,
> -	.disable = mtk_hdmi_bridge_disable,
> -	.post_disable = mtk_hdmi_bridge_post_disable,
> +	.atomic_disable = mtk_hdmi_bridge_atomic_disable,
> +	.atomic_post_disable = mtk_hdmi_bridge_atomic_post_disable,
>  	.mode_set = mtk_hdmi_bridge_mode_set,
> -	.pre_enable = mtk_hdmi_bridge_pre_enable,
> -	.enable = mtk_hdmi_bridge_enable,
> +	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
> +	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
>  };
>  
>  static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,

-- 
Regards,

Laurent Pinchart

Re: [PATCH v2 1/3] drm/mediatek: Switch the hdmi bridge ops to the atomic versions

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:30PM +0200, Dafna Hirschfeld wrote:
> The bridge operation '.enable' and the audio cb '.get_eld'
> access hdmi->conn. In the future we will want to support
> the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR and then we will
> not have direct access to the connector.
> The atomic version '.atomic_enable' allows accessing the
> current connector from the state.
> This patch switches the bridge to the atomic version to
> prepare access to the connector in later patches.
> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 8ee55f9e2954..f2c810b767ef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1357,7 +1357,8 @@ static bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
>  	return true;
>  }
>  
> -static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
> +					   struct drm_bridge_state *old_bridge_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1371,7 +1372,8 @@ static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
>  	hdmi->enabled = false;
>  }
>  
> -static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
> +						struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1406,7 +1408,8 @@ static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
>  	drm_mode_copy(&hdmi->mode, adjusted_mode);
>  }
>  
> -static void mtk_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
> +					      struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1426,7 +1429,8 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
>  		mtk_hdmi_setup_vendor_specific_infoframe(hdmi, mode);
>  }
>  
> -static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
> +					  struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1440,13 +1444,16 @@ static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
>  }
>  
>  static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> +	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> +	.atomic_reset = drm_atomic_helper_bridge_reset,
>  	.attach = mtk_hdmi_bridge_attach,
>  	.mode_fixup = mtk_hdmi_bridge_mode_fixup,
> -	.disable = mtk_hdmi_bridge_disable,
> -	.post_disable = mtk_hdmi_bridge_post_disable,
> +	.atomic_disable = mtk_hdmi_bridge_atomic_disable,
> +	.atomic_post_disable = mtk_hdmi_bridge_atomic_post_disable,
>  	.mode_set = mtk_hdmi_bridge_mode_set,
> -	.pre_enable = mtk_hdmi_bridge_pre_enable,
> -	.enable = mtk_hdmi_bridge_enable,
> +	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
> +	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
>  };
>  
>  static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,

-- 
Regards,

Laurent Pinchart

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Re: [PATCH v2 1/3] drm/mediatek: Switch the hdmi bridge ops to the atomic versions

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:30PM +0200, Dafna Hirschfeld wrote:
> The bridge operation '.enable' and the audio cb '.get_eld'
> access hdmi->conn. In the future we will want to support
> the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR and then we will
> not have direct access to the connector.
> The atomic version '.atomic_enable' allows accessing the
> current connector from the state.
> This patch switches the bridge to the atomic version to
> prepare access to the connector in later patches.
> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 8ee55f9e2954..f2c810b767ef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1357,7 +1357,8 @@ static bool mtk_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
>  	return true;
>  }
>  
> -static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
> +					   struct drm_bridge_state *old_bridge_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1371,7 +1372,8 @@ static void mtk_hdmi_bridge_disable(struct drm_bridge *bridge)
>  	hdmi->enabled = false;
>  }
>  
> -static void mtk_hdmi_bridge_post_disable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_post_disable(struct drm_bridge *bridge,
> +						struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1406,7 +1408,8 @@ static void mtk_hdmi_bridge_mode_set(struct drm_bridge *bridge,
>  	drm_mode_copy(&hdmi->mode, adjusted_mode);
>  }
>  
> -static void mtk_hdmi_bridge_pre_enable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
> +					      struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1426,7 +1429,8 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
>  		mtk_hdmi_setup_vendor_specific_infoframe(hdmi, mode);
>  }
>  
> -static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
> +static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
> +					  struct drm_bridge_state *old_state)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> @@ -1440,13 +1444,16 @@ static void mtk_hdmi_bridge_enable(struct drm_bridge *bridge)
>  }
>  
>  static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> +	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> +	.atomic_reset = drm_atomic_helper_bridge_reset,
>  	.attach = mtk_hdmi_bridge_attach,
>  	.mode_fixup = mtk_hdmi_bridge_mode_fixup,
> -	.disable = mtk_hdmi_bridge_disable,
> -	.post_disable = mtk_hdmi_bridge_post_disable,
> +	.atomic_disable = mtk_hdmi_bridge_atomic_disable,
> +	.atomic_post_disable = mtk_hdmi_bridge_atomic_post_disable,
>  	.mode_set = mtk_hdmi_bridge_mode_set,
> -	.pre_enable = mtk_hdmi_bridge_pre_enable,
> -	.enable = mtk_hdmi_bridge_enable,
> +	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
> +	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
>  };
>  
>  static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,

-- 
Regards,

Laurent Pinchart
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Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> broke the display support for elm device since mtk_dpi calls
> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
> while mtk_hdmi does not yet support this flag.
> 
> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
> call drm_bridge_hpd_notify() to report HPD. This provides the
> necessary API to support disabling connector creation.
> 
> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
> But with the difference that in mtk-hdmi only the option of not creating
> a connector is supported.
> 
> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
>  1 file changed, 44 insertions(+), 85 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index f2c810b767ef..1eeb211b1536 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>  	return container_of(b, struct mtk_hdmi, bridge);
>  }
>  
> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
> -{
> -	return container_of(c, struct mtk_hdmi, conn);
> -}
> -
>  static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>  {
>  	return readl(hdmi->regs + offset);
> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
>  	       connector_status_connected : connector_status_disconnected;
>  }
>  
> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
> -						  bool force)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -	return mtk_hdmi_update_plugged_status(hdmi);
> -}
> -
> -static void hdmi_conn_destroy(struct drm_connector *conn)
> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
> +				      struct drm_connector *connector)
>  {
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> -	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
> -
> -	drm_connector_cleanup(conn);
> -}
> -
> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>  	struct edid *edid;
> -	int ret;
>  
>  	if (!hdmi->ddc_adpt)
> -		return -ENODEV;
> -
> -	edid = drm_get_edid(conn, hdmi->ddc_adpt);
> +		return NULL;
> +	edid = drm_get_edid(connector, hdmi->ddc_adpt);
>  	if (!edid)
> -		return -ENODEV;
> -
> +		return NULL;
>  	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
> +	return edid;
> +}
>  
> -	drm_connector_update_edid_property(conn, edid);
> -
> -	ret = drm_add_edid_modes(conn, edid);
> -	kfree(edid);
> -	return ret;
> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
> +{
> +	return mtk_hdmi_update_plugged_status(hdmi);
>  }
>  
> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
> -				    struct drm_display_mode *mode)
> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
> +				      const struct drm_display_info *info,
> +				      const struct drm_display_mode *mode)
>  {
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  	struct drm_bridge *next_bridge;
>  
>  	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>  	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
>  }
>  
> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> -	return hdmi->bridge.encoder;
> -}
> -
> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
> -	.detect = hdmi_conn_detect,
> -	.fill_modes = drm_helper_probe_single_connector_modes,
> -	.destroy = hdmi_conn_destroy,
> -	.reset = drm_atomic_helper_connector_reset,
> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -};
> -
> -static const struct drm_connector_helper_funcs
> -		mtk_hdmi_connector_helper_funcs = {
> -	.get_modes = mtk_hdmi_conn_get_modes,
> -	.mode_valid = mtk_hdmi_conn_mode_valid,
> -	.best_encoder = mtk_hdmi_conn_best_enc,
> -};
> -
>  static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
>  {
>  	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>  
> -	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
> +	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
> +		static enum drm_connector_status status;
> +
> +		status = mtk_hdmi_detect(hdmi);
>  		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);

I think you can drop this, as drm_bridge_connector_hpd_cb() calls
drm_kms_helper_hotplug_event().

> +		drm_bridge_hpd_notify(&hdmi->bridge, status);
> +	}
>  }
>  
>  /*
>   * Bridge callbacks
>   */
>  
> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
> +{
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> +	return mtk_hdmi_detect(hdmi);
> +}
> +
> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
> +					     struct drm_connector *connector)
> +{
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> +	return mtk_hdmi_get_edid(hdmi, connector);

As mtk_hdmi_get_edid() is only called here, you could inline it in this
function. Up to you.

> +}
> +
>  static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
>  				  enum drm_bridge_attach_flags flags)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  	int ret;
>  
> -	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> -		DRM_ERROR("Fix bridge driver to make connector optional!");
> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> +		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
> +			  __func__);
>  		return -EINVAL;
>  	}
>  
> -	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
> -					  &mtk_hdmi_connector_funcs,
> -					  DRM_MODE_CONNECTOR_HDMIA,
> -					  hdmi->ddc_adpt);
> -	if (ret) {
> -		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
> -		return ret;
> -	}
> -	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
> -
> -	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
> -	hdmi->conn.interlace_allowed = true;
> -	hdmi->conn.doublescan_allowed = false;
> -
> -	ret = drm_connector_attach_encoder(&hdmi->conn,
> -						bridge->encoder);
> -	if (ret) {
> -		dev_err(hdmi->dev,
> -			"Failed to attach connector to encoder: %d\n", ret);
> -		return ret;
> -	}
> -
>  	if (hdmi->next_bridge) {
>  		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>  					bridge, flags);
> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>  }
>  
>  static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> +	.mode_valid = mtk_hdmi_bridge_mode_valid,
>  	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>  	.atomic_reset = drm_atomic_helper_bridge_reset,
> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>  	.mode_set = mtk_hdmi_bridge_mode_set,
>  	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
>  	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
> +	.detect = mtk_hdmi_bridge_detect,
> +	.get_edid = mtk_hdmi_bridge_get_edid,
>  };
>  
>  static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>  
>  	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
>  	hdmi->bridge.of_node = pdev->dev.of_node;
> +	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
> +			   | DRM_BRIDGE_OP_HPD;

Nitpicking, I'd align the | to the =.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>  	drm_bridge_add(&hdmi->bridge);
>  
>  	ret = mtk_hdmi_clk_enable_audio(hdmi);

-- 
Regards,

Laurent Pinchart

Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> broke the display support for elm device since mtk_dpi calls
> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
> while mtk_hdmi does not yet support this flag.
> 
> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
> call drm_bridge_hpd_notify() to report HPD. This provides the
> necessary API to support disabling connector creation.
> 
> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
> But with the difference that in mtk-hdmi only the option of not creating
> a connector is supported.
> 
> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
>  1 file changed, 44 insertions(+), 85 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index f2c810b767ef..1eeb211b1536 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>  	return container_of(b, struct mtk_hdmi, bridge);
>  }
>  
> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
> -{
> -	return container_of(c, struct mtk_hdmi, conn);
> -}
> -
>  static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>  {
>  	return readl(hdmi->regs + offset);
> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
>  	       connector_status_connected : connector_status_disconnected;
>  }
>  
> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
> -						  bool force)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -	return mtk_hdmi_update_plugged_status(hdmi);
> -}
> -
> -static void hdmi_conn_destroy(struct drm_connector *conn)
> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
> +				      struct drm_connector *connector)
>  {
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> -	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
> -
> -	drm_connector_cleanup(conn);
> -}
> -
> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>  	struct edid *edid;
> -	int ret;
>  
>  	if (!hdmi->ddc_adpt)
> -		return -ENODEV;
> -
> -	edid = drm_get_edid(conn, hdmi->ddc_adpt);
> +		return NULL;
> +	edid = drm_get_edid(connector, hdmi->ddc_adpt);
>  	if (!edid)
> -		return -ENODEV;
> -
> +		return NULL;
>  	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
> +	return edid;
> +}
>  
> -	drm_connector_update_edid_property(conn, edid);
> -
> -	ret = drm_add_edid_modes(conn, edid);
> -	kfree(edid);
> -	return ret;
> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
> +{
> +	return mtk_hdmi_update_plugged_status(hdmi);
>  }
>  
> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
> -				    struct drm_display_mode *mode)
> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
> +				      const struct drm_display_info *info,
> +				      const struct drm_display_mode *mode)
>  {
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  	struct drm_bridge *next_bridge;
>  
>  	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>  	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
>  }
>  
> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> -	return hdmi->bridge.encoder;
> -}
> -
> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
> -	.detect = hdmi_conn_detect,
> -	.fill_modes = drm_helper_probe_single_connector_modes,
> -	.destroy = hdmi_conn_destroy,
> -	.reset = drm_atomic_helper_connector_reset,
> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -};
> -
> -static const struct drm_connector_helper_funcs
> -		mtk_hdmi_connector_helper_funcs = {
> -	.get_modes = mtk_hdmi_conn_get_modes,
> -	.mode_valid = mtk_hdmi_conn_mode_valid,
> -	.best_encoder = mtk_hdmi_conn_best_enc,
> -};
> -
>  static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
>  {
>  	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>  
> -	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
> +	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
> +		static enum drm_connector_status status;
> +
> +		status = mtk_hdmi_detect(hdmi);
>  		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);

I think you can drop this, as drm_bridge_connector_hpd_cb() calls
drm_kms_helper_hotplug_event().

> +		drm_bridge_hpd_notify(&hdmi->bridge, status);
> +	}
>  }
>  
>  /*
>   * Bridge callbacks
>   */
>  
> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
> +{
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> +	return mtk_hdmi_detect(hdmi);
> +}
> +
> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
> +					     struct drm_connector *connector)
> +{
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> +	return mtk_hdmi_get_edid(hdmi, connector);

As mtk_hdmi_get_edid() is only called here, you could inline it in this
function. Up to you.

> +}
> +
>  static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
>  				  enum drm_bridge_attach_flags flags)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  	int ret;
>  
> -	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> -		DRM_ERROR("Fix bridge driver to make connector optional!");
> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> +		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
> +			  __func__);
>  		return -EINVAL;
>  	}
>  
> -	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
> -					  &mtk_hdmi_connector_funcs,
> -					  DRM_MODE_CONNECTOR_HDMIA,
> -					  hdmi->ddc_adpt);
> -	if (ret) {
> -		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
> -		return ret;
> -	}
> -	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
> -
> -	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
> -	hdmi->conn.interlace_allowed = true;
> -	hdmi->conn.doublescan_allowed = false;
> -
> -	ret = drm_connector_attach_encoder(&hdmi->conn,
> -						bridge->encoder);
> -	if (ret) {
> -		dev_err(hdmi->dev,
> -			"Failed to attach connector to encoder: %d\n", ret);
> -		return ret;
> -	}
> -
>  	if (hdmi->next_bridge) {
>  		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>  					bridge, flags);
> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>  }
>  
>  static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> +	.mode_valid = mtk_hdmi_bridge_mode_valid,
>  	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>  	.atomic_reset = drm_atomic_helper_bridge_reset,
> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>  	.mode_set = mtk_hdmi_bridge_mode_set,
>  	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
>  	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
> +	.detect = mtk_hdmi_bridge_detect,
> +	.get_edid = mtk_hdmi_bridge_get_edid,
>  };
>  
>  static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>  
>  	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
>  	hdmi->bridge.of_node = pdev->dev.of_node;
> +	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
> +			   | DRM_BRIDGE_OP_HPD;

Nitpicking, I'd align the | to the =.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>  	drm_bridge_add(&hdmi->bridge);
>  
>  	ret = mtk_hdmi_clk_enable_audio(hdmi);

-- 
Regards,

Laurent Pinchart

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Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> broke the display support for elm device since mtk_dpi calls
> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
> while mtk_hdmi does not yet support this flag.
> 
> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
> call drm_bridge_hpd_notify() to report HPD. This provides the
> necessary API to support disabling connector creation.
> 
> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
> But with the difference that in mtk-hdmi only the option of not creating
> a connector is supported.
> 
> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
>  1 file changed, 44 insertions(+), 85 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index f2c810b767ef..1eeb211b1536 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>  	return container_of(b, struct mtk_hdmi, bridge);
>  }
>  
> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
> -{
> -	return container_of(c, struct mtk_hdmi, conn);
> -}
> -
>  static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>  {
>  	return readl(hdmi->regs + offset);
> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
>  	       connector_status_connected : connector_status_disconnected;
>  }
>  
> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
> -						  bool force)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -	return mtk_hdmi_update_plugged_status(hdmi);
> -}
> -
> -static void hdmi_conn_destroy(struct drm_connector *conn)
> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
> +				      struct drm_connector *connector)
>  {
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> -	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
> -
> -	drm_connector_cleanup(conn);
> -}
> -
> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>  	struct edid *edid;
> -	int ret;
>  
>  	if (!hdmi->ddc_adpt)
> -		return -ENODEV;
> -
> -	edid = drm_get_edid(conn, hdmi->ddc_adpt);
> +		return NULL;
> +	edid = drm_get_edid(connector, hdmi->ddc_adpt);
>  	if (!edid)
> -		return -ENODEV;
> -
> +		return NULL;
>  	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
> +	return edid;
> +}
>  
> -	drm_connector_update_edid_property(conn, edid);
> -
> -	ret = drm_add_edid_modes(conn, edid);
> -	kfree(edid);
> -	return ret;
> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
> +{
> +	return mtk_hdmi_update_plugged_status(hdmi);
>  }
>  
> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
> -				    struct drm_display_mode *mode)
> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
> +				      const struct drm_display_info *info,
> +				      const struct drm_display_mode *mode)
>  {
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  	struct drm_bridge *next_bridge;
>  
>  	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>  	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
>  }
>  
> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
> -{
> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> -	return hdmi->bridge.encoder;
> -}
> -
> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
> -	.detect = hdmi_conn_detect,
> -	.fill_modes = drm_helper_probe_single_connector_modes,
> -	.destroy = hdmi_conn_destroy,
> -	.reset = drm_atomic_helper_connector_reset,
> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -};
> -
> -static const struct drm_connector_helper_funcs
> -		mtk_hdmi_connector_helper_funcs = {
> -	.get_modes = mtk_hdmi_conn_get_modes,
> -	.mode_valid = mtk_hdmi_conn_mode_valid,
> -	.best_encoder = mtk_hdmi_conn_best_enc,
> -};
> -
>  static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
>  {
>  	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>  
> -	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
> +	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
> +		static enum drm_connector_status status;
> +
> +		status = mtk_hdmi_detect(hdmi);
>  		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);

I think you can drop this, as drm_bridge_connector_hpd_cb() calls
drm_kms_helper_hotplug_event().

> +		drm_bridge_hpd_notify(&hdmi->bridge, status);
> +	}
>  }
>  
>  /*
>   * Bridge callbacks
>   */
>  
> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
> +{
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> +	return mtk_hdmi_detect(hdmi);
> +}
> +
> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
> +					     struct drm_connector *connector)
> +{
> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> +	return mtk_hdmi_get_edid(hdmi, connector);

As mtk_hdmi_get_edid() is only called here, you could inline it in this
function. Up to you.

> +}
> +
>  static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
>  				  enum drm_bridge_attach_flags flags)
>  {
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  	int ret;
>  
> -	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> -		DRM_ERROR("Fix bridge driver to make connector optional!");
> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> +		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
> +			  __func__);
>  		return -EINVAL;
>  	}
>  
> -	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
> -					  &mtk_hdmi_connector_funcs,
> -					  DRM_MODE_CONNECTOR_HDMIA,
> -					  hdmi->ddc_adpt);
> -	if (ret) {
> -		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
> -		return ret;
> -	}
> -	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
> -
> -	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
> -	hdmi->conn.interlace_allowed = true;
> -	hdmi->conn.doublescan_allowed = false;
> -
> -	ret = drm_connector_attach_encoder(&hdmi->conn,
> -						bridge->encoder);
> -	if (ret) {
> -		dev_err(hdmi->dev,
> -			"Failed to attach connector to encoder: %d\n", ret);
> -		return ret;
> -	}
> -
>  	if (hdmi->next_bridge) {
>  		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>  					bridge, flags);
> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>  }
>  
>  static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> +	.mode_valid = mtk_hdmi_bridge_mode_valid,
>  	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>  	.atomic_reset = drm_atomic_helper_bridge_reset,
> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>  	.mode_set = mtk_hdmi_bridge_mode_set,
>  	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
>  	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
> +	.detect = mtk_hdmi_bridge_detect,
> +	.get_edid = mtk_hdmi_bridge_get_edid,
>  };
>  
>  static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>  
>  	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
>  	hdmi->bridge.of_node = pdev->dev.of_node;
> +	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
> +			   | DRM_BRIDGE_OP_HPD;

Nitpicking, I'd align the | to the =.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>  	drm_bridge_add(&hdmi->bridge);
>  
>  	ret = mtk_hdmi_clk_enable_audio(hdmi);

-- 
Regards,

Laurent Pinchart
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Re: [PATCH v2 3/3] drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn ptr

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:32PM +0200, Dafna Hirschfeld wrote:
> The mtk_hdmi does not support creating a bridge with a connector.
> Therefore the field 'conn' should be removed from the mtk_hdmi struct.
> It is replaced with a pointer curr_conn that points to the current
> connector which can be access through the global state.
> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

The patch looks good to me, but I'd squash it with 2/3 otherwise I think
you'll break bisection. On the other hand, given that the HDMI support
is already broken... :-)

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

But you need to make sure this patch will get backported to stable along
2/3, probably by adding a fixes tag. Or squashing it with 2/3, up to
you.

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 1eeb211b1536..0d95d2cfe3de 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -153,7 +153,7 @@ struct mtk_hdmi_conf {
>  struct mtk_hdmi {
>  	struct drm_bridge bridge;
>  	struct drm_bridge *next_bridge;
> -	struct drm_connector conn;
> +	struct drm_connector *curr_conn;/* current connector (only valid when 'enabled') */
>  	struct device *dev;
>  	const struct mtk_hdmi_conf *conf;
>  	struct phy *phy;
> @@ -969,7 +969,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
>  	ssize_t err;
>  
>  	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
> -						       &hdmi->conn, mode);
> +						       hdmi->curr_conn, mode);
>  	if (err < 0) {
>  		dev_err(hdmi->dev,
>  			"Failed to get AVI infoframe from mode: %zd\n", err);
> @@ -1049,7 +1049,7 @@ static int mtk_hdmi_setup_vendor_specific_infoframe(struct mtk_hdmi *hdmi,
>  	ssize_t err;
>  
>  	err = drm_hdmi_vendor_infoframe_from_display_mode(&frame,
> -							  &hdmi->conn, mode);
> +							  hdmi->curr_conn, mode);
>  	if (err) {
>  		dev_err(hdmi->dev,
>  			"Failed to get vendor infoframe from mode: %zd\n", err);
> @@ -1322,6 +1322,8 @@ static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
>  	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
>  	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
>  
> +	hdmi->curr_conn = NULL;
> +
>  	hdmi->enabled = false;
>  }
>  
> @@ -1385,8 +1387,13 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
>  static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>  					  struct drm_bridge_state *old_state)
>  {
> +	struct drm_atomic_state *state = old_state->base.state;
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> +	/* Retrieve the connector through the atomic state. */
> +	hdmi->curr_conn = drm_atomic_get_new_connector_for_encoder(state,
> +								   bridge->encoder);
> +
>  	mtk_hdmi_output_set_display_mode(hdmi, &hdmi->mode);
>  	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
>  	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
> @@ -1625,8 +1632,10 @@ static int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
>  {
>  	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>  
> -	memcpy(buf, hdmi->conn.eld, min(sizeof(hdmi->conn.eld), len));
> -
> +	if (hdmi->enabled)
> +		memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
> +	else
> +		memset(buf, 0, len);
>  	return 0;
>  }
>  

-- 
Regards,

Laurent Pinchart

Re: [PATCH v2 3/3] drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn ptr

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:32PM +0200, Dafna Hirschfeld wrote:
> The mtk_hdmi does not support creating a bridge with a connector.
> Therefore the field 'conn' should be removed from the mtk_hdmi struct.
> It is replaced with a pointer curr_conn that points to the current
> connector which can be access through the global state.
> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

The patch looks good to me, but I'd squash it with 2/3 otherwise I think
you'll break bisection. On the other hand, given that the HDMI support
is already broken... :-)

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

But you need to make sure this patch will get backported to stable along
2/3, probably by adding a fixes tag. Or squashing it with 2/3, up to
you.

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 1eeb211b1536..0d95d2cfe3de 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -153,7 +153,7 @@ struct mtk_hdmi_conf {
>  struct mtk_hdmi {
>  	struct drm_bridge bridge;
>  	struct drm_bridge *next_bridge;
> -	struct drm_connector conn;
> +	struct drm_connector *curr_conn;/* current connector (only valid when 'enabled') */
>  	struct device *dev;
>  	const struct mtk_hdmi_conf *conf;
>  	struct phy *phy;
> @@ -969,7 +969,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
>  	ssize_t err;
>  
>  	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
> -						       &hdmi->conn, mode);
> +						       hdmi->curr_conn, mode);
>  	if (err < 0) {
>  		dev_err(hdmi->dev,
>  			"Failed to get AVI infoframe from mode: %zd\n", err);
> @@ -1049,7 +1049,7 @@ static int mtk_hdmi_setup_vendor_specific_infoframe(struct mtk_hdmi *hdmi,
>  	ssize_t err;
>  
>  	err = drm_hdmi_vendor_infoframe_from_display_mode(&frame,
> -							  &hdmi->conn, mode);
> +							  hdmi->curr_conn, mode);
>  	if (err) {
>  		dev_err(hdmi->dev,
>  			"Failed to get vendor infoframe from mode: %zd\n", err);
> @@ -1322,6 +1322,8 @@ static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
>  	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
>  	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
>  
> +	hdmi->curr_conn = NULL;
> +
>  	hdmi->enabled = false;
>  }
>  
> @@ -1385,8 +1387,13 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
>  static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>  					  struct drm_bridge_state *old_state)
>  {
> +	struct drm_atomic_state *state = old_state->base.state;
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> +	/* Retrieve the connector through the atomic state. */
> +	hdmi->curr_conn = drm_atomic_get_new_connector_for_encoder(state,
> +								   bridge->encoder);
> +
>  	mtk_hdmi_output_set_display_mode(hdmi, &hdmi->mode);
>  	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
>  	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
> @@ -1625,8 +1632,10 @@ static int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
>  {
>  	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>  
> -	memcpy(buf, hdmi->conn.eld, min(sizeof(hdmi->conn.eld), len));
> -
> +	if (hdmi->enabled)
> +		memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
> +	else
> +		memset(buf, 0, len);
>  	return 0;
>  }
>  

-- 
Regards,

Laurent Pinchart

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Re: [PATCH v2 3/3] drm/mediatek: in struct mtk_hdmi, replace conn field with curr_conn ptr

[Laurent Pinchart]

Hi Dafna,

Thank you for the patch.

On Mon, Mar 29, 2021 at 05:36:32PM +0200, Dafna Hirschfeld wrote:
> The mtk_hdmi does not support creating a bridge with a connector.
> Therefore the field 'conn' should be removed from the mtk_hdmi struct.
> It is replaced with a pointer curr_conn that points to the current
> connector which can be access through the global state.
> 
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>

The patch looks good to me, but I'd squash it with 2/3 otherwise I think
you'll break bisection. On the other hand, given that the HDMI support
is already broken... :-)

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

But you need to make sure this patch will get backported to stable along
2/3, probably by adding a fixes tag. Or squashing it with 2/3, up to
you.

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 1eeb211b1536..0d95d2cfe3de 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -153,7 +153,7 @@ struct mtk_hdmi_conf {
>  struct mtk_hdmi {
>  	struct drm_bridge bridge;
>  	struct drm_bridge *next_bridge;
> -	struct drm_connector conn;
> +	struct drm_connector *curr_conn;/* current connector (only valid when 'enabled') */
>  	struct device *dev;
>  	const struct mtk_hdmi_conf *conf;
>  	struct phy *phy;
> @@ -969,7 +969,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hdmi *hdmi,
>  	ssize_t err;
>  
>  	err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
> -						       &hdmi->conn, mode);
> +						       hdmi->curr_conn, mode);
>  	if (err < 0) {
>  		dev_err(hdmi->dev,
>  			"Failed to get AVI infoframe from mode: %zd\n", err);
> @@ -1049,7 +1049,7 @@ static int mtk_hdmi_setup_vendor_specific_infoframe(struct mtk_hdmi *hdmi,
>  	ssize_t err;
>  
>  	err = drm_hdmi_vendor_infoframe_from_display_mode(&frame,
> -							  &hdmi->conn, mode);
> +							  hdmi->curr_conn, mode);
>  	if (err) {
>  		dev_err(hdmi->dev,
>  			"Failed to get vendor infoframe from mode: %zd\n", err);
> @@ -1322,6 +1322,8 @@ static void mtk_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
>  	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
>  	clk_disable_unprepare(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
>  
> +	hdmi->curr_conn = NULL;
> +
>  	hdmi->enabled = false;
>  }
>  
> @@ -1385,8 +1387,13 @@ static void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi,
>  static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>  					  struct drm_bridge_state *old_state)
>  {
> +	struct drm_atomic_state *state = old_state->base.state;
>  	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>  
> +	/* Retrieve the connector through the atomic state. */
> +	hdmi->curr_conn = drm_atomic_get_new_connector_for_encoder(state,
> +								   bridge->encoder);
> +
>  	mtk_hdmi_output_set_display_mode(hdmi, &hdmi->mode);
>  	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PLL]);
>  	clk_prepare_enable(hdmi->clk[MTK_HDMI_CLK_HDMI_PIXEL]);
> @@ -1625,8 +1632,10 @@ static int mtk_hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
>  {
>  	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>  
> -	memcpy(buf, hdmi->conn.eld, min(sizeof(hdmi->conn.eld), len));
> -
> +	if (hdmi->enabled)
> +		memcpy(buf, hdmi->curr_conn->eld, min(sizeof(hdmi->curr_conn->eld), len));
> +	else
> +		memset(buf, 0, len);
>  	return 0;
>  }
>  

-- 
Regards,

Laurent Pinchart
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Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

Hi,

On 30.03.21 02:08, Laurent Pinchart wrote:
> Hi Dafna,
> 
> Thank you for the patch.
> 
> On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
>> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
>> broke the display support for elm device since mtk_dpi calls
>> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
>> while mtk_hdmi does not yet support this flag.
>>
>> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
>> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
>> call drm_bridge_hpd_notify() to report HPD. This provides the
>> necessary API to support disabling connector creation.
>>
>> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
>> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
>> But with the difference that in mtk-hdmi only the option of not creating
>> a connector is supported.
>>
>> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
>> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
>>   1 file changed, 44 insertions(+), 85 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index f2c810b767ef..1eeb211b1536 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>>   	return container_of(b, struct mtk_hdmi, bridge);
>>   }
>>   
>> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
>> -{
>> -	return container_of(c, struct mtk_hdmi, conn);
>> -}
>> -
>>   static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>>   {
>>   	return readl(hdmi->regs + offset);
>> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
>>   	       connector_status_connected : connector_status_disconnected;
>>   }
>>   
>> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
>> -						  bool force)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -	return mtk_hdmi_update_plugged_status(hdmi);
>> -}
>> -
>> -static void hdmi_conn_destroy(struct drm_connector *conn)
>> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
>> +				      struct drm_connector *connector)
>>   {
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -
>> -	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
>> -
>> -	drm_connector_cleanup(conn);
>> -}
>> -
>> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>>   	struct edid *edid;
>> -	int ret;
>>   
>>   	if (!hdmi->ddc_adpt)
>> -		return -ENODEV;
>> -
>> -	edid = drm_get_edid(conn, hdmi->ddc_adpt);
>> +		return NULL;
>> +	edid = drm_get_edid(connector, hdmi->ddc_adpt);
>>   	if (!edid)
>> -		return -ENODEV;
>> -
>> +		return NULL;
>>   	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
>> +	return edid;
>> +}
>>   
>> -	drm_connector_update_edid_property(conn, edid);
>> -
>> -	ret = drm_add_edid_modes(conn, edid);
>> -	kfree(edid);
>> -	return ret;
>> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
>> +{
>> +	return mtk_hdmi_update_plugged_status(hdmi);
>>   }
>>   
>> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>> -				    struct drm_display_mode *mode)
>> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
>> +				      const struct drm_display_info *info,
>> +				      const struct drm_display_mode *mode)
>>   {
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>>   	struct drm_bridge *next_bridge;
>>   
>>   	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
>> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>>   	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
>>   }
>>   
>> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -
>> -	return hdmi->bridge.encoder;
>> -}
>> -
>> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
>> -	.detect = hdmi_conn_detect,
>> -	.fill_modes = drm_helper_probe_single_connector_modes,
>> -	.destroy = hdmi_conn_destroy,
>> -	.reset = drm_atomic_helper_connector_reset,
>> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>> -};
>> -
>> -static const struct drm_connector_helper_funcs
>> -		mtk_hdmi_connector_helper_funcs = {
>> -	.get_modes = mtk_hdmi_conn_get_modes,
>> -	.mode_valid = mtk_hdmi_conn_mode_valid,
>> -	.best_encoder = mtk_hdmi_conn_best_enc,
>> -};
>> -
>>   static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
>>   {
>>   	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>>   
>> -	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
>> +	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
>> +		static enum drm_connector_status status;
>> +
>> +		status = mtk_hdmi_detect(hdmi);
>>   		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
> 
> I think you can drop this, as drm_bridge_connector_hpd_cb() calls
> drm_kms_helper_hotplug_event().

I see that drm_kms_helper_hotplug_event is called from drm_bridge_connector_hpd_cb,
which is set as a birdge's 'hpd_cb' when calling drm_bridge_connector_enable_hpd,
but mkt_dpi does not call this funcion for the drm_bridge_connector.

I also wonder why bridges have both 'hpd_cb' and a function 'hpd_notify'.
It seems that both are called upon hot-plug event.
It is also confusing that the function drm_bridge_hpd_notify calls the 'hpd_cb'
and not the 'hpd_notfiy'. I can send a patch to change the name to 'drm_bridge_hpd_cb'

Thanks,
Dafna

> 
>> +		drm_bridge_hpd_notify(&hdmi->bridge, status);
>> +	}
>>   }
>>   
>>   /*
>>    * Bridge callbacks
>>    */
>>   
>> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
>> +{
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>> +
>> +	return mtk_hdmi_detect(hdmi);
>> +}
>> +
>> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
>> +					     struct drm_connector *connector)
>> +{
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>> +
>> +	return mtk_hdmi_get_edid(hdmi, connector);
> 
> As mtk_hdmi_get_edid() is only called here, you could inline it in this
> function. Up to you.
> 
>> +}
>> +
>>   static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
>>   				  enum drm_bridge_attach_flags flags)
>>   {
>>   	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>>   	int ret;
>>   
>> -	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
>> -		DRM_ERROR("Fix bridge driver to make connector optional!");
>> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
>> +		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
>> +			  __func__);
>>   		return -EINVAL;
>>   	}
>>   
>> -	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
>> -					  &mtk_hdmi_connector_funcs,
>> -					  DRM_MODE_CONNECTOR_HDMIA,
>> -					  hdmi->ddc_adpt);
>> -	if (ret) {
>> -		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
>> -		return ret;
>> -	}
>> -	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
>> -
>> -	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
>> -	hdmi->conn.interlace_allowed = true;
>> -	hdmi->conn.doublescan_allowed = false;
>> -
>> -	ret = drm_connector_attach_encoder(&hdmi->conn,
>> -						bridge->encoder);
>> -	if (ret) {
>> -		dev_err(hdmi->dev,
>> -			"Failed to attach connector to encoder: %d\n", ret);
>> -		return ret;
>> -	}
>> -
>>   	if (hdmi->next_bridge) {
>>   		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>>   					bridge, flags);
>> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>>   }
>>   
>>   static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>> +	.mode_valid = mtk_hdmi_bridge_mode_valid,
>>   	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>>   	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>>   	.atomic_reset = drm_atomic_helper_bridge_reset,
>> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>>   	.mode_set = mtk_hdmi_bridge_mode_set,
>>   	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
>>   	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
>> +	.detect = mtk_hdmi_bridge_detect,
>> +	.get_edid = mtk_hdmi_bridge_get_edid,
>>   };
>>   
>>   static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>>   
>>   	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
>>   	hdmi->bridge.of_node = pdev->dev.of_node;
>> +	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
>> +			   | DRM_BRIDGE_OP_HPD;
> 
> Nitpicking, I'd align the | to the =.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
>> +	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>>   	drm_bridge_add(&hdmi->bridge);
>>   
>>   	ret = mtk_hdmi_clk_enable_audio(hdmi);
> 

Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

Hi,

On 30.03.21 02:08, Laurent Pinchart wrote:
> Hi Dafna,
> 
> Thank you for the patch.
> 
> On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
>> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
>> broke the display support for elm device since mtk_dpi calls
>> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
>> while mtk_hdmi does not yet support this flag.
>>
>> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
>> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
>> call drm_bridge_hpd_notify() to report HPD. This provides the
>> necessary API to support disabling connector creation.
>>
>> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
>> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
>> But with the difference that in mtk-hdmi only the option of not creating
>> a connector is supported.
>>
>> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
>> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
>>   1 file changed, 44 insertions(+), 85 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index f2c810b767ef..1eeb211b1536 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>>   	return container_of(b, struct mtk_hdmi, bridge);
>>   }
>>   
>> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
>> -{
>> -	return container_of(c, struct mtk_hdmi, conn);
>> -}
>> -
>>   static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>>   {
>>   	return readl(hdmi->regs + offset);
>> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
>>   	       connector_status_connected : connector_status_disconnected;
>>   }
>>   
>> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
>> -						  bool force)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -	return mtk_hdmi_update_plugged_status(hdmi);
>> -}
>> -
>> -static void hdmi_conn_destroy(struct drm_connector *conn)
>> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
>> +				      struct drm_connector *connector)
>>   {
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -
>> -	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
>> -
>> -	drm_connector_cleanup(conn);
>> -}
>> -
>> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>>   	struct edid *edid;
>> -	int ret;
>>   
>>   	if (!hdmi->ddc_adpt)
>> -		return -ENODEV;
>> -
>> -	edid = drm_get_edid(conn, hdmi->ddc_adpt);
>> +		return NULL;
>> +	edid = drm_get_edid(connector, hdmi->ddc_adpt);
>>   	if (!edid)
>> -		return -ENODEV;
>> -
>> +		return NULL;
>>   	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
>> +	return edid;
>> +}
>>   
>> -	drm_connector_update_edid_property(conn, edid);
>> -
>> -	ret = drm_add_edid_modes(conn, edid);
>> -	kfree(edid);
>> -	return ret;
>> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
>> +{
>> +	return mtk_hdmi_update_plugged_status(hdmi);
>>   }
>>   
>> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>> -				    struct drm_display_mode *mode)
>> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
>> +				      const struct drm_display_info *info,
>> +				      const struct drm_display_mode *mode)
>>   {
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>>   	struct drm_bridge *next_bridge;
>>   
>>   	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
>> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>>   	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
>>   }
>>   
>> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -
>> -	return hdmi->bridge.encoder;
>> -}
>> -
>> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
>> -	.detect = hdmi_conn_detect,
>> -	.fill_modes = drm_helper_probe_single_connector_modes,
>> -	.destroy = hdmi_conn_destroy,
>> -	.reset = drm_atomic_helper_connector_reset,
>> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>> -};
>> -
>> -static const struct drm_connector_helper_funcs
>> -		mtk_hdmi_connector_helper_funcs = {
>> -	.get_modes = mtk_hdmi_conn_get_modes,
>> -	.mode_valid = mtk_hdmi_conn_mode_valid,
>> -	.best_encoder = mtk_hdmi_conn_best_enc,
>> -};
>> -
>>   static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
>>   {
>>   	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>>   
>> -	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
>> +	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
>> +		static enum drm_connector_status status;
>> +
>> +		status = mtk_hdmi_detect(hdmi);
>>   		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
> 
> I think you can drop this, as drm_bridge_connector_hpd_cb() calls
> drm_kms_helper_hotplug_event().

I see that drm_kms_helper_hotplug_event is called from drm_bridge_connector_hpd_cb,
which is set as a birdge's 'hpd_cb' when calling drm_bridge_connector_enable_hpd,
but mkt_dpi does not call this funcion for the drm_bridge_connector.

I also wonder why bridges have both 'hpd_cb' and a function 'hpd_notify'.
It seems that both are called upon hot-plug event.
It is also confusing that the function drm_bridge_hpd_notify calls the 'hpd_cb'
and not the 'hpd_notfiy'. I can send a patch to change the name to 'drm_bridge_hpd_cb'

Thanks,
Dafna

> 
>> +		drm_bridge_hpd_notify(&hdmi->bridge, status);
>> +	}
>>   }
>>   
>>   /*
>>    * Bridge callbacks
>>    */
>>   
>> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
>> +{
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>> +
>> +	return mtk_hdmi_detect(hdmi);
>> +}
>> +
>> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
>> +					     struct drm_connector *connector)
>> +{
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>> +
>> +	return mtk_hdmi_get_edid(hdmi, connector);
> 
> As mtk_hdmi_get_edid() is only called here, you could inline it in this
> function. Up to you.
> 
>> +}
>> +
>>   static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
>>   				  enum drm_bridge_attach_flags flags)
>>   {
>>   	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>>   	int ret;
>>   
>> -	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
>> -		DRM_ERROR("Fix bridge driver to make connector optional!");
>> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
>> +		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
>> +			  __func__);
>>   		return -EINVAL;
>>   	}
>>   
>> -	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
>> -					  &mtk_hdmi_connector_funcs,
>> -					  DRM_MODE_CONNECTOR_HDMIA,
>> -					  hdmi->ddc_adpt);
>> -	if (ret) {
>> -		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
>> -		return ret;
>> -	}
>> -	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
>> -
>> -	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
>> -	hdmi->conn.interlace_allowed = true;
>> -	hdmi->conn.doublescan_allowed = false;
>> -
>> -	ret = drm_connector_attach_encoder(&hdmi->conn,
>> -						bridge->encoder);
>> -	if (ret) {
>> -		dev_err(hdmi->dev,
>> -			"Failed to attach connector to encoder: %d\n", ret);
>> -		return ret;
>> -	}
>> -
>>   	if (hdmi->next_bridge) {
>>   		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>>   					bridge, flags);
>> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>>   }
>>   
>>   static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>> +	.mode_valid = mtk_hdmi_bridge_mode_valid,
>>   	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>>   	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>>   	.atomic_reset = drm_atomic_helper_bridge_reset,
>> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>>   	.mode_set = mtk_hdmi_bridge_mode_set,
>>   	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
>>   	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
>> +	.detect = mtk_hdmi_bridge_detect,
>> +	.get_edid = mtk_hdmi_bridge_get_edid,
>>   };
>>   
>>   static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>>   
>>   	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
>>   	hdmi->bridge.of_node = pdev->dev.of_node;
>> +	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
>> +			   | DRM_BRIDGE_OP_HPD;
> 
> Nitpicking, I'd align the | to the =.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
>> +	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>>   	drm_bridge_add(&hdmi->bridge);
>>   
>>   	ret = mtk_hdmi_clk_enable_audio(hdmi);
> 

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Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector creation

[Dafna Hirschfeld]

Hi,

On 30.03.21 02:08, Laurent Pinchart wrote:
> Hi Dafna,
> 
> Thank you for the patch.
> 
> On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
>> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
>> broke the display support for elm device since mtk_dpi calls
>> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
>> while mtk_hdmi does not yet support this flag.
>>
>> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
>> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
>> call drm_bridge_hpd_notify() to report HPD. This provides the
>> necessary API to support disabling connector creation.
>>
>> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
>> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
>> But with the difference that in mtk-hdmi only the option of not creating
>> a connector is supported.
>>
>> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
>> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
>>   1 file changed, 44 insertions(+), 85 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index f2c810b767ef..1eeb211b1536 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>>   	return container_of(b, struct mtk_hdmi, bridge);
>>   }
>>   
>> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
>> -{
>> -	return container_of(c, struct mtk_hdmi, conn);
>> -}
>> -
>>   static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>>   {
>>   	return readl(hdmi->regs + offset);
>> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
>>   	       connector_status_connected : connector_status_disconnected;
>>   }
>>   
>> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
>> -						  bool force)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -	return mtk_hdmi_update_plugged_status(hdmi);
>> -}
>> -
>> -static void hdmi_conn_destroy(struct drm_connector *conn)
>> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
>> +				      struct drm_connector *connector)
>>   {
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -
>> -	mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
>> -
>> -	drm_connector_cleanup(conn);
>> -}
>> -
>> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>>   	struct edid *edid;
>> -	int ret;
>>   
>>   	if (!hdmi->ddc_adpt)
>> -		return -ENODEV;
>> -
>> -	edid = drm_get_edid(conn, hdmi->ddc_adpt);
>> +		return NULL;
>> +	edid = drm_get_edid(connector, hdmi->ddc_adpt);
>>   	if (!edid)
>> -		return -ENODEV;
>> -
>> +		return NULL;
>>   	hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
>> +	return edid;
>> +}
>>   
>> -	drm_connector_update_edid_property(conn, edid);
>> -
>> -	ret = drm_add_edid_modes(conn, edid);
>> -	kfree(edid);
>> -	return ret;
>> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
>> +{
>> +	return mtk_hdmi_update_plugged_status(hdmi);
>>   }
>>   
>> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>> -				    struct drm_display_mode *mode)
>> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
>> +				      const struct drm_display_info *info,
>> +				      const struct drm_display_mode *mode)
>>   {
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>>   	struct drm_bridge *next_bridge;
>>   
>>   	dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
>> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>>   	return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
>>   }
>>   
>> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
>> -{
>> -	struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
>> -
>> -	return hdmi->bridge.encoder;
>> -}
>> -
>> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
>> -	.detect = hdmi_conn_detect,
>> -	.fill_modes = drm_helper_probe_single_connector_modes,
>> -	.destroy = hdmi_conn_destroy,
>> -	.reset = drm_atomic_helper_connector_reset,
>> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>> -};
>> -
>> -static const struct drm_connector_helper_funcs
>> -		mtk_hdmi_connector_helper_funcs = {
>> -	.get_modes = mtk_hdmi_conn_get_modes,
>> -	.mode_valid = mtk_hdmi_conn_mode_valid,
>> -	.best_encoder = mtk_hdmi_conn_best_enc,
>> -};
>> -
>>   static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
>>   {
>>   	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>>   
>> -	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
>> +	if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
>> +		static enum drm_connector_status status;
>> +
>> +		status = mtk_hdmi_detect(hdmi);
>>   		drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
> 
> I think you can drop this, as drm_bridge_connector_hpd_cb() calls
> drm_kms_helper_hotplug_event().

I see that drm_kms_helper_hotplug_event is called from drm_bridge_connector_hpd_cb,
which is set as a birdge's 'hpd_cb' when calling drm_bridge_connector_enable_hpd,
but mkt_dpi does not call this funcion for the drm_bridge_connector.

I also wonder why bridges have both 'hpd_cb' and a function 'hpd_notify'.
It seems that both are called upon hot-plug event.
It is also confusing that the function drm_bridge_hpd_notify calls the 'hpd_cb'
and not the 'hpd_notfiy'. I can send a patch to change the name to 'drm_bridge_hpd_cb'

Thanks,
Dafna

> 
>> +		drm_bridge_hpd_notify(&hdmi->bridge, status);
>> +	}
>>   }
>>   
>>   /*
>>    * Bridge callbacks
>>    */
>>   
>> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
>> +{
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>> +
>> +	return mtk_hdmi_detect(hdmi);
>> +}
>> +
>> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
>> +					     struct drm_connector *connector)
>> +{
>> +	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>> +
>> +	return mtk_hdmi_get_edid(hdmi, connector);
> 
> As mtk_hdmi_get_edid() is only called here, you could inline it in this
> function. Up to you.
> 
>> +}
>> +
>>   static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
>>   				  enum drm_bridge_attach_flags flags)
>>   {
>>   	struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
>>   	int ret;
>>   
>> -	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
>> -		DRM_ERROR("Fix bridge driver to make connector optional!");
>> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
>> +		DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
>> +			  __func__);
>>   		return -EINVAL;
>>   	}
>>   
>> -	ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
>> -					  &mtk_hdmi_connector_funcs,
>> -					  DRM_MODE_CONNECTOR_HDMIA,
>> -					  hdmi->ddc_adpt);
>> -	if (ret) {
>> -		dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
>> -		return ret;
>> -	}
>> -	drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
>> -
>> -	hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
>> -	hdmi->conn.interlace_allowed = true;
>> -	hdmi->conn.doublescan_allowed = false;
>> -
>> -	ret = drm_connector_attach_encoder(&hdmi->conn,
>> -						bridge->encoder);
>> -	if (ret) {
>> -		dev_err(hdmi->dev,
>> -			"Failed to attach connector to encoder: %d\n", ret);
>> -		return ret;
>> -	}
>> -
>>   	if (hdmi->next_bridge) {
>>   		ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
>>   					bridge, flags);
>> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
>>   }
>>   
>>   static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>> +	.mode_valid = mtk_hdmi_bridge_mode_valid,
>>   	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>>   	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>>   	.atomic_reset = drm_atomic_helper_bridge_reset,
>> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
>>   	.mode_set = mtk_hdmi_bridge_mode_set,
>>   	.atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
>>   	.atomic_enable = mtk_hdmi_bridge_atomic_enable,
>> +	.detect = mtk_hdmi_bridge_detect,
>> +	.get_edid = mtk_hdmi_bridge_get_edid,
>>   };
>>   
>>   static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>>   
>>   	hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
>>   	hdmi->bridge.of_node = pdev->dev.of_node;
>> +	hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
>> +			   | DRM_BRIDGE_OP_HPD;
> 
> Nitpicking, I'd align the | to the =.
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
>> +	hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
>>   	drm_bridge_add(&hdmi->bridge);
>>   
>>   	ret = mtk_hdmi_clk_enable_audio(hdmi);
> 
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