[PATCH v4 00/10] Synopsys DisplayPort Controller improvements for Rockchip platforms

[PATCH v4 00/10] Synopsys DisplayPort Controller improvements for Rockchip platforms

[Sebastian Reichel]

This patch series updates the Synopsys Designware DisplayPort bridge
together with the only existing user: The Rockchip RK3576/RK3588:

 1. follow-up bridges (PHY, USB-C connector)
    this is needed to get USB-C DP AltMode working; I've followed the
    Qualcomm driver as reference

 2. runtime PM
    the initial driver has been upstreamed without RPM; add it to
    avoid wasting power when nothing is plugged

 3. audio
    the initial driver has been upstreamed without audio support;
    this adds all missing bits for audio with single stream transport

To properly make use of the bridge code the following USBDP PHY series
is also needed:

https://lore.kernel.org/all/20260714-rockchip-usbdp-cleanup-v13-0-6cb3e769d4c5@collabora.com/

There are two parts, which possibly need some discussion:

 1. I added a dedicated bridge callback for out-of-band hotplug events,
    which is separate from the hotplug_notify. I have a feeling, that
    there might be a better solution, but haven't found it.

 2. The DT binding for audio support works perfectly fine, but is not
    really ready for MST. I don't intend to implement MST right now,
    but the binding should obviously take it into consideration to
    avoid breaking it in the future. I've put different options into
    the patch description and went with the easy one, which is easy to
    test.

Changes in PATCHv4:
 - Link to v3: https://lore.kernel.org/all/20260612-synopsys-dw-dp-improvements-v3-0-dc61e6352508@collabora.com/
 - Drop "Simplify driver data setting" (effectively reverted later on)
 - Add "Fix incorrect resource lifetimes in bind callback", which
   affects all following patches quite a bit (Sashiko)
 - Update "Add follow-up bridge support" to mention that fatal errors
   are fine (Sashiko)
 - Update "Add out-of-band HPD notify handler" to use
   drm_for_each_bridge_in_chain() instead of
   drm_for_each_bridge_in_chain_scoped() required after rebase to
   latest drm-misc-next
 - Add 100ms sleep in hpd detect functions after runtime resume in the
   "Add Runtime PM support" patch (Andy Yan)
 - Keep runtime PM enabled if DP is used without USB-C to avoid missing
   HPD signals in "Add Runtime PM support" patch (Andy Yan)
 - Update patch description of DT binding patch and drop RFC tag
 - Use pm_runtime_resume_and_get() in the audio startup function, which
   allows easy error handling (Sashiko)
 - Avoid updating audio_interface in the audio prepare function when
   an error related early exit happens (Sashiko)
 - Add error handling for clock prepare calls in audio prepare function
   (Sashiko)

Changes in PATCHv3:
- Link to v2: https://lore.kernel.org/r/20260501-synopsys-dw-dp-improvements-v2-0-d7e7f6bac77f@collabora.com
- Collect Reviewed-by on "Simplify driver data setting" patch (Andy Yan)
- Use of_drm_get_bridge_by_endpoint instead of devm_drm_of_get_bridge (Luca Ceresoli)
- Use FIELD_PREP_WM16 instead of FIELD_PREP_WM16_CONST (Chaoyi Chen)
- Rebase to latest drm-misc-next (Dropped Cristian's patches)

Changes in PATCHv2:
 * Link to v1: https://lore.kernel.org/r/20260326-synopsys-dw-dp-improvements-v1-0-501849162290@collabora.com
 * rebased to latest drm-misc-next
 * prepended the Patches from Cristian's cleanup series, as they also
   needed a rebase and should be merged first
   https://lore.kernel.org/dri-devel/20260327-drm-rk-fixes-v3-0-fd2e6900c08c@collabora.com/
 * fix issue with the audio stream (un)prepare handling in last patch

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
Sebastian Reichel (10):
      drm/bridge: synopsys: dw-dp: Fix incorrect resource lifetimes in bind callback
      drm/bridge: synopsys: dw-dp: Support MEDIA_BUS_FMT_FIXED
      drm/bridge: synopsys: dw-dp: Add follow-up bridge support
      drm/bridge: Add out-of-band HPD notify handler
      drm/bridge: synopsys: dw-dp: Support software triggered OOB HPD
      drm/rockchip: dw_dp: Implement out-of-band HPD handling
      drm/bridge: synopsys: dw-dp: Add Runtime PM support
      drm/rockchip: dw_dp: Add runtime PM support
      dt-bindings: display: rockchip: dw-dp: Fix sound DAI cells
      drm/bridge: synopsys: dw-dp: Add audio support

 .../bindings/display/rockchip/rockchip,dw-dp.yaml  |   9 +-
 drivers/gpu/drm/bridge/synopsys/dw-dp.c            | 456 ++++++++++++++++++---
 drivers/gpu/drm/display/drm_bridge_connector.c     |   6 +
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c          | 223 ++++++++--
 include/drm/bridge/dw_dp.h                         |  11 +-
 include/drm/drm_bridge.h                           |  14 +
 6 files changed, 629 insertions(+), 90 deletions(-)
---
base-commit: 7296004bd2ceb1284fb557399f0134361f8e34af
change-id: 20260325-synopsys-dw-dp-improvements-7da2e98df1dd

Best regards,
-- 
Sebastian Reichel <sebastian.reichel@collabora.com>


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[PATCH v4 01/10] drm/bridge: synopsys: dw-dp: Fix incorrect resource lifetimes in bind callback

[Sebastian Reichel]

Currently the Synopsys DesignWare DP controller driver's bind function
requests lots of resources using device managed functions. These are
free'd on driver removal instead of at unbind time. Fix this discrepancy
by introducing a new probe helper function and moving over most of the
early resource acquisitions.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c   | 128 +++++++++++++++---------------
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c |  53 ++++++++-----
 include/drm/bridge/dw_dp.h                |   5 +-
 3 files changed, 99 insertions(+), 87 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index 3445c82e6f50..368e1f85e625 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -1954,20 +1954,72 @@ static const struct regmap_config dw_dp_regmap_config = {
 	.rd_table = &dw_dp_readable_table,
 };
 
-static void dw_dp_phy_exit(void *data)
+int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder)
 {
-	struct dw_dp *dp = data;
+	struct device *dev = dp->dev;
+	struct drm_bridge *bridge;
+	int ret;
+
+	bridge = &dp->bridge;
+	bridge->of_node = dev->of_node;
+	bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
+	bridge->type = DRM_MODE_CONNECTOR_DisplayPort;
+	bridge->ycbcr_420_allowed = true;
+
+	drm_bridge_add(bridge);
+
+	dp->aux.dev = dev;
+	dp->aux.drm_dev = encoder->dev;
+	dp->aux.name = dev_name(dev);
+	dp->aux.transfer = dw_dp_aux_transfer;
+	ret = drm_dp_aux_register(&dp->aux);
+	if (ret) {
+		dev_err_probe(dev, ret, "Aux register failed\n");
+		goto unregister_bridge;
+	}
+
+	ret = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+	if (ret) {
+		dev_err_probe(dev, ret, "Failed to attach bridge\n");
+		goto unregister_aux;
+	}
+
+	dw_dp_init_hw(dp);
 
+	ret = phy_init(dp->phy);
+	if (ret) {
+		dev_err_probe(dev, ret, "phy init failed\n");
+		goto unregister_aux;
+	}
+
+	enable_irq(dp->irq);
+
+	return 0;
+
+unregister_aux:
+	drm_dp_aux_unregister(&dp->aux);
+
+unregister_bridge:
+	drm_bridge_remove(bridge);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dw_dp_bind);
+
+void dw_dp_unbind(struct dw_dp *dp)
+{
+	disable_irq(dp->irq);
 	phy_exit(dp->phy);
+	drm_dp_aux_unregister(&dp->aux);
+	drm_bridge_remove(&dp->bridge);
 }
+EXPORT_SYMBOL_GPL(dw_dp_unbind);
 
-struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder,
-			 const struct dw_dp_plat_data *plat_data)
+struct dw_dp *dw_dp_probe(struct platform_device *pdev, const struct dw_dp_plat_data *plat_data)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct dw_dp *dp;
-	struct drm_bridge *bridge;
+	struct device *dev = &pdev->dev;
 	void __iomem *res;
+	struct dw_dp *dp;
 	int ret;
 
 	dp = devm_drm_bridge_alloc(dev, struct dw_dp, bridge, &dw_dp_bridge_funcs);
@@ -1976,9 +2028,8 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder,
 
 	dp->dev = dev;
 	dp->pixel_mode = plat_data->pixel_mode;
-
 	dp->plat_data.max_link_rate = plat_data->max_link_rate;
-	bridge = &dp->bridge;
+
 	mutex_init(&dp->irq_lock);
 	INIT_WORK(&dp->hpd_work, dw_dp_hpd_work);
 	init_completion(&dp->complete);
@@ -2035,69 +2086,20 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder,
 		return ERR_CAST(dp->rstc);
 	}
 
-	bridge->of_node = dev->of_node;
-	bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
-	bridge->type = DRM_MODE_CONNECTOR_DisplayPort;
-	bridge->ycbcr_420_allowed = true;
-
-	ret = devm_drm_bridge_add(dev, bridge);
-	if (ret)
-		return ERR_PTR(ret);
-
-	dp->aux.dev = dev;
-	dp->aux.drm_dev = encoder->dev;
-	dp->aux.name = dev_name(dev);
-	dp->aux.transfer = dw_dp_aux_transfer;
-	ret = drm_dp_aux_register(&dp->aux);
-	if (ret) {
-		dev_err_probe(dev, ret, "Aux register failed\n");
-		return ERR_PTR(ret);
-	}
-
-	ret = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
-	if (ret) {
-		dev_err_probe(dev, ret, "Failed to attach bridge\n");
-		goto unregister_aux;
-	}
-
-	dw_dp_init_hw(dp);
-
-	ret = phy_init(dp->phy);
-	if (ret) {
-		dev_err_probe(dev, ret, "phy init failed\n");
-		goto unregister_aux;
-	}
-
-	ret = devm_add_action_or_reset(dev, dw_dp_phy_exit, dp);
-	if (ret)
-		goto unregister_aux;
-
 	dp->irq = platform_get_irq(pdev, 0);
-	if (dp->irq < 0) {
-		ret = dp->irq;
-		goto unregister_aux;
-	}
+	if (dp->irq < 0)
+		return ERR_PTR(dp->irq);
 
 	ret = devm_request_threaded_irq(dev, dp->irq, NULL, dw_dp_irq,
-					IRQF_ONESHOT, dev_name(dev), dp);
+					IRQF_ONESHOT | IRQF_NO_AUTOEN, dev_name(dev), dp);
 	if (ret) {
 		dev_err_probe(dev, ret, "failed to request irq\n");
-		goto unregister_aux;
+		return ERR_PTR(ret);
 	}
 
 	return dp;
-
-unregister_aux:
-	drm_dp_aux_unregister(&dp->aux);
-	return ERR_PTR(ret);
 }
-EXPORT_SYMBOL_GPL(dw_dp_bind);
-
-void dw_dp_unbind(struct dw_dp *dp)
-{
-	drm_dp_aux_unregister(&dp->aux);
-}
-EXPORT_SYMBOL_GPL(dw_dp_unbind);
+EXPORT_SYMBOL_GPL(dw_dp_probe);
 
 MODULE_AUTHOR("Andy Yan <andyshrk@163.com>");
 MODULE_DESCRIPTION("DW DP Core Library");
diff --git a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
index b23efb153c9e..005938dc66c9 100644
--- a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
@@ -26,7 +26,7 @@
 struct rockchip_dw_dp {
 	struct dw_dp *base;
 	struct device *dev;
-	struct rockchip_encoder encoder;
+	struct rockchip_encoder *encoder;
 };
 
 static int dw_dp_encoder_atomic_check(struct drm_encoder *encoder,
@@ -73,37 +73,28 @@ static const struct drm_encoder_helper_funcs dw_dp_encoder_helper_funcs = {
 
 static int dw_dp_rockchip_bind(struct device *dev, struct device *master, void *data)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	const struct dw_dp_plat_data *plat_data;
+	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
 	struct drm_device *drm_dev = data;
-	struct rockchip_dw_dp *dp;
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
 	int ret;
 
-	dp = drmm_kzalloc(drm_dev, sizeof(*dp), GFP_KERNEL);
-	if (!dp)
+	dp->encoder = drmm_kzalloc(drm_dev, sizeof(*dp->encoder), GFP_KERNEL);
+	if (!dp->encoder)
 		return -ENOMEM;
 
-	dp->dev = dev;
-	platform_set_drvdata(pdev, dp);
-
-	plat_data = of_device_get_match_data(dev);
-	if (!plat_data)
-		return -ENODEV;
-
-	encoder = &dp->encoder.encoder;
+	encoder = &dp->encoder->encoder;
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev, dev->of_node);
-	rockchip_drm_encoder_set_crtc_endpoint_id(&dp->encoder, dev->of_node, 0, 0);
+	rockchip_drm_encoder_set_crtc_endpoint_id(dp->encoder, dev->of_node, 0, 0);
 
 	ret = drmm_encoder_init(drm_dev, encoder, NULL, DRM_MODE_ENCODER_TMDS, NULL);
 	if (ret)
 		return ret;
 	drm_encoder_helper_add(encoder, &dw_dp_encoder_helper_funcs);
 
-	dp->base = dw_dp_bind(dev, encoder, plat_data);
-	if (IS_ERR(dp->base))
-		return PTR_ERR(dp->base);
+	ret = dw_dp_bind(dp->base, encoder);
+	if (ret)
+		return ret;
 
 	connector = drm_bridge_connector_init(drm_dev, encoder);
 	if (IS_ERR(connector)) {
@@ -128,12 +119,30 @@ static const struct component_ops dw_dp_rockchip_component_ops = {
 	.unbind = dw_dp_rockchip_unbind,
 };
 
-static int dw_dp_probe(struct platform_device *pdev)
+static int dw_dp_rockchip_probe(struct platform_device *pdev)
 {
+	const struct dw_dp_plat_data *plat_data;
+	struct device *dev = &pdev->dev;
+	struct rockchip_dw_dp *dp;
+
+	plat_data = of_device_get_match_data(dev);
+	if (!plat_data)
+		return -ENODEV;
+
+	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
+	if (!dp)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, dp);
+	dp->dev = dev;
+
+	dp->base = dw_dp_probe(pdev, plat_data);
+	if (IS_ERR(dp->base))
+		return PTR_ERR(dp->base);
+
 	return component_add(&pdev->dev, &dw_dp_rockchip_component_ops);
 }
 
-static void dw_dp_remove(struct platform_device *pdev)
+static void dw_dp_rockchip_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &dw_dp_rockchip_component_ops);
 }
@@ -161,8 +170,8 @@ static const struct of_device_id dw_dp_of_match[] = {
 MODULE_DEVICE_TABLE(of, dw_dp_of_match);
 
 struct platform_driver dw_dp_driver = {
-	.probe	= dw_dp_probe,
-	.remove = dw_dp_remove,
+	.probe	= dw_dp_rockchip_probe,
+	.remove = dw_dp_rockchip_remove,
 	.driver = {
 		.name = "dw-dp",
 		.of_match_table = dw_dp_of_match,
diff --git a/include/drm/bridge/dw_dp.h b/include/drm/bridge/dw_dp.h
index 22105c3e8e4d..a82412a9e769 100644
--- a/include/drm/bridge/dw_dp.h
+++ b/include/drm/bridge/dw_dp.h
@@ -22,7 +22,8 @@ struct dw_dp_plat_data {
 	u8 pixel_mode;
 };
 
-struct dw_dp *dw_dp_bind(struct device *dev, struct drm_encoder *encoder,
-			 const struct dw_dp_plat_data *plat_data);
+int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder);
 void dw_dp_unbind(struct dw_dp *dp);
+
+struct dw_dp *dw_dp_probe(struct platform_device *pdev, const struct dw_dp_plat_data *plat_data);
 #endif /* __DW_DP__ */

-- 
2.53.0


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[PATCH v4 02/10] drm/bridge: synopsys: dw-dp: Support MEDIA_BUS_FMT_FIXED

[Sebastian Reichel]

Add support for MEDIA_BUS_FMT_FIXED, which is e.g. requested for USB-C
DP chains as the last bridge in the chain (aux-hpd-bridge) does not
implement atomic_get_output_bus_fmts(), which results in the generic
drm_atomic_bridge_chain_select_bus_fmts() code using MEDIA_BUS_FMT_FIXED
instead.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index 368e1f85e625..aca6816febe6 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -1528,6 +1528,7 @@ static int dw_dp_bridge_atomic_check(struct drm_bridge *bridge,
 				     struct drm_connector_state *conn_state)
 {
 	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+	unsigned int out_bus_format = bridge_state->output_bus_cfg.format;
 	struct dw_dp *dp = bridge_to_dp(bridge);
 	struct dw_dp_bridge_state *state;
 	const struct dw_dp_output_format *fmt;
@@ -1538,7 +1539,10 @@ static int dw_dp_bridge_atomic_check(struct drm_bridge *bridge,
 	state = to_dw_dp_bridge_state(bridge_state);
 	mode = &state->mode;
 
-	fmt = dw_dp_get_output_format(bridge_state->output_bus_cfg.format);
+	if (out_bus_format == MEDIA_BUS_FMT_FIXED)
+		out_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+
+	fmt = dw_dp_get_output_format(out_bus_format);
 	if (!fmt)
 		return -EINVAL;
 

-- 
2.53.0


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[PATCH v4 03/10] drm/bridge: synopsys: dw-dp: Add follow-up bridge support

[Sebastian Reichel]

Add support to use USB-C connectors with the DP altmode helper code on
devicetree based platforms. To get this working there must be a DRM
bridge chain from the DisplayPort controller to the USB-C connector.
E.g. on Rockchip RK3576:

root@rk3576 # cat /sys/kernel/debug/dri/0/encoder-0/bridges
bridge[0]: dw_dp_bridge_funcs
        refcount: 7
        type: [10] DP
        OF: /soc/dp@27e40000:rockchip,rk3576-dp
        ops: [0x47] detect edid hpd
bridge[1]: drm_aux_bridge_funcs
        refcount: 4
        type: [0] Unknown
        OF: /soc/phy@2b010000:rockchip,rk3576-usbdp-phy
        ops: [0x0]
bridge[2]: drm_aux_hpd_bridge_funcs
        refcount: 5
        type: [10] DP
        OF: /soc/i2c@2ac50000/typec-portc@22/connector:usb-c-connector
        ops: [0x4] hpd

It's fine to fatally error out when there is no follow-up bridge
as the Rockchip Designware Displayport controller is the only
user of the bridge helper and has the port marked as required
in its binding.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index aca6816febe6..0e8ecd73a000 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -329,6 +329,8 @@ struct dw_dp {
 	struct dw_dp_plat_data plat_data;
 	u8 pixel_mode;
 
+	struct drm_bridge *next_bridge;
+
 	DECLARE_BITMAP(sdp_reg_bank, SDP_REG_BANK_SIZE);
 };
 
@@ -1988,18 +1990,35 @@ int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder)
 		goto unregister_aux;
 	}
 
+	dp->next_bridge = of_drm_get_bridge_by_endpoint(dev->of_node, 1, 0);
+	if (IS_ERR(dp->next_bridge)) {
+		ret = PTR_ERR(dp->next_bridge);
+		dev_err_probe(dev, ret, "failed to get follow-up bridge.\n");
+		goto unregister_aux;
+	}
+
+	ret = drm_bridge_attach(encoder, dp->next_bridge, bridge,
+				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+	if (ret) {
+		dev_err_probe(dev, ret, "Failed to attach next bridge\n");
+		goto put_next_bridge;
+	}
+
 	dw_dp_init_hw(dp);
 
 	ret = phy_init(dp->phy);
 	if (ret) {
 		dev_err_probe(dev, ret, "phy init failed\n");
-		goto unregister_aux;
+		goto put_next_bridge;
 	}
 
 	enable_irq(dp->irq);
 
 	return 0;
 
+put_next_bridge:
+	drm_bridge_put(dp->next_bridge);
+
 unregister_aux:
 	drm_dp_aux_unregister(&dp->aux);
 
@@ -2014,6 +2033,7 @@ void dw_dp_unbind(struct dw_dp *dp)
 {
 	disable_irq(dp->irq);
 	phy_exit(dp->phy);
+	drm_bridge_put(dp->next_bridge);
 	drm_dp_aux_unregister(&dp->aux);
 	drm_bridge_remove(&dp->bridge);
 }

-- 
2.53.0


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[PATCH v4 04/10] drm/bridge: Add out-of-band HPD notify handler

[Sebastian Reichel]

For DP bridges, that can be used for DP AltMode, it might be necessary
to enforce HPD status. There is an existing ->oob_hotplug_event() on
the DRM connector, but it currently just calls into hpd_notify().

As DP bridge drivers usually also implement .detect and that also
generates calls into hpd_notify, this is a bad place to force the
HPD status as the follow-up detect call might force it off again
resulting in all follow-up calls to the detection routine also
failing.

Avoid this by having a dedicated function for OOB events.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/display/drm_bridge_connector.c |  6 ++++++
 include/drm/drm_bridge.h                       | 14 ++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 8b54069fa53a..632cc3ae3b54 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -180,6 +180,12 @@ static void drm_bridge_connector_oob_hotplug_event(struct drm_connector *connect
 	struct drm_bridge_connector *bridge_connector =
 		to_drm_bridge_connector(connector);
 
+	/* Notify all bridges in the pipeline of hotplug events. */
+	drm_for_each_bridge_in_chain(bridge_connector->encoder, bridge) {
+		if (bridge->funcs->oob_notify)
+			bridge->funcs->oob_notify(bridge, connector, status);
+	}
+
 	drm_bridge_connector_handle_hpd(bridge_connector, status);
 }
 
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 3ac84ed57ab2..f38010d2edd1 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -540,6 +540,20 @@ struct drm_bridge_funcs {
 	 */
 	void (*hpd_disable)(struct drm_bridge *bridge);
 
+	/**
+	 * @oob_notify:
+	 *
+	 * Notify the bridge of out of band hot plug detection.
+	 *
+	 * This callback is optional, it may be implemented by bridges that
+	 * need to be notified of display connection or disconnection for
+	 * internal reasons. One use case is to force the DP controllers HPD
+	 * signal for USB-C DP AltMode.
+	 */
+	void (*oob_notify)(struct drm_bridge *bridge,
+			   struct drm_connector *connector,
+			   enum drm_connector_status status);
+
 	/**
 	 * @hdmi_tmds_char_rate_valid:
 	 *

-- 
2.53.0


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[PATCH v4 05/10] drm/bridge: synopsys: dw-dp: Support software triggered OOB HPD

[Sebastian Reichel]

Add support for USB-C DP AltMode out-of-band hotplug handling. The
handling itself is implemented in the platform specific driver as the
registers to force HPD state are not part of the Designware DisplayPort
IP itself. Instead the platform integration might provide the necessary
functionality to mux the HPD signal.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c | 38 +++++++++++++++++++++++++++++++++
 include/drm/bridge/dw_dp.h              |  3 +++
 2 files changed, 41 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index 0e8ecd73a000..8eb2699dc7ab 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -1819,6 +1819,19 @@ static struct drm_bridge_state *dw_dp_bridge_atomic_duplicate_state(struct drm_b
 	return &state->base;
 }
 
+static void dw_dp_bridge_oob_notify(struct drm_bridge *bridge,
+				    struct drm_connector *connector,
+				    enum drm_connector_status status)
+{
+	bool hpd_high = status != connector_status_disconnected;
+	struct dw_dp *dp = bridge_to_dp(bridge);
+
+	if (dp->plat_data.hpd_sw_cfg)
+		dp->plat_data.hpd_sw_cfg(dp->plat_data.data, hpd_high);
+	else
+		dev_err_once(dp->dev, "Missing platform handler for OOB HPD handling\n");
+}
+
 static const struct drm_bridge_funcs dw_dp_bridge_funcs = {
 	.atomic_duplicate_state = dw_dp_bridge_atomic_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -1831,6 +1844,7 @@ static const struct drm_bridge_funcs dw_dp_bridge_funcs = {
 	.atomic_disable = dw_dp_bridge_atomic_disable,
 	.detect = dw_dp_bridge_detect,
 	.edid_read = dw_dp_bridge_edid_read,
+	.oob_notify = dw_dp_bridge_oob_notify,
 };
 
 static int dw_dp_link_retrain(struct dw_dp *dp)
@@ -1960,6 +1974,19 @@ static const struct regmap_config dw_dp_regmap_config = {
 	.rd_table = &dw_dp_readable_table,
 };
 
+static bool dw_dp_is_routed_to_usb_c(struct drm_encoder *encoder)
+{
+	struct drm_bridge *last_bridge __free(drm_bridge_put) = NULL;
+	struct fwnode_handle *fwnode;
+
+	last_bridge = drm_bridge_chain_get_last_bridge(encoder);
+	if (!last_bridge)
+		return false;
+
+	fwnode = of_fwnode_handle(last_bridge->of_node);
+	return fwnode_device_is_compatible(fwnode, "usb-c-connector");
+}
+
 int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder)
 {
 	struct device *dev = dp->dev;
@@ -2004,6 +2031,13 @@ int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder)
 		goto put_next_bridge;
 	}
 
+	if (dw_dp_is_routed_to_usb_c(encoder)) {
+		dev_dbg(dev, "USB-C mode\n");
+
+		if (dp->plat_data.hpd_sw_sel)
+			dp->plat_data.hpd_sw_sel(dp->plat_data.data, 1);
+	}
+
 	dw_dp_init_hw(dp);
 
 	ret = phy_init(dp->phy);
@@ -2052,6 +2086,10 @@ struct dw_dp *dw_dp_probe(struct platform_device *pdev, const struct dw_dp_plat_
 
 	dp->dev = dev;
 	dp->pixel_mode = plat_data->pixel_mode;
+
+	dp->plat_data.hpd_sw_sel = plat_data->hpd_sw_sel;
+	dp->plat_data.hpd_sw_cfg = plat_data->hpd_sw_cfg;
+	dp->plat_data.data = plat_data->data;
 	dp->plat_data.max_link_rate = plat_data->max_link_rate;
 
 	mutex_init(&dp->irq_lock);
diff --git a/include/drm/bridge/dw_dp.h b/include/drm/bridge/dw_dp.h
index a82412a9e769..79b2cdf0df99 100644
--- a/include/drm/bridge/dw_dp.h
+++ b/include/drm/bridge/dw_dp.h
@@ -20,6 +20,9 @@ enum {
 struct dw_dp_plat_data {
 	u32 max_link_rate;
 	u8 pixel_mode;
+	void *data;
+	void (*hpd_sw_sel)(void *data, bool hpd);
+	void (*hpd_sw_cfg)(void *data, bool hpd);
 };
 
 int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder);

-- 
2.53.0


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[PATCH v4 06/10] drm/rockchip: dw_dp: Implement out-of-band HPD handling

[Sebastian Reichel]

Implement out-of-band hotplug handling, which will be used to receive
external hotplug information from the USB-C state machine. This is
currently handled by the USBDP PHY, which brings quite some trouble
as the register being accessed requires the power-domain from the DP
controller and also requires custom TypeC HPD info parsing in the
USBDP PHY driver.

In contrast to the USBDP PHY this does not just enable the hotplug
signal when a DP AltMode capable adapter is plugged in, but instead
properly detects if a cable is plugged in for things like USB-C to
HDMI adapters.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c | 123 ++++++++++++++++++++++++++++--
 1 file changed, 118 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
index 005938dc66c9..0ecbad24dd4e 100644
--- a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
@@ -7,9 +7,12 @@
  */
 
 #include <linux/component.h>
+#include <linux/hw_bitfield.h>
 #include <linux/media-bus-format.h>
+#include <linux/mfd/syscon.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
 #include <linux/videodev2.h>
 
 #include <drm/bridge/dw_dp.h>
@@ -23,12 +26,54 @@
 
 #include "rockchip_drm_drv.h"
 
+#define ROCKCHIP_MAX_CTRLS 2
+
+#define ROCKCHIP_VO_GRF_DP_SINK_HPD_SEL BIT(10)
+#define ROCKCHIP_VO_GRF_DP_SINK_HPD_CFG BIT(11)
+
+struct rockchip_dw_dp_plat_data {
+	u8 num_ctrls;
+	u32 ctrl_ids[ROCKCHIP_MAX_CTRLS];
+	u32 max_link_rate;
+	u8 pixel_mode;
+	u32 hpd_reg[ROCKCHIP_MAX_CTRLS];
+};
+
 struct rockchip_dw_dp {
 	struct dw_dp *base;
 	struct device *dev;
+	const struct rockchip_dw_dp_plat_data *pdata;
+	struct regmap *vo_grf;
 	struct rockchip_encoder *encoder;
+	int id;
+	bool hpd_sel;
+	bool hpd_cfg;
 };
 
+static void dw_dp_rockchip_hpd_sw_sel(void *data, bool force_hpd_from_sw)
+{
+	struct rockchip_dw_dp *dp = data;
+	u32 hpd_reg = dp->pdata->hpd_reg[dp->id];
+
+	dp->hpd_sel = force_hpd_from_sw;
+
+	regmap_write(dp->vo_grf, hpd_reg,
+		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_SEL, dp->hpd_sel));
+}
+
+static void dw_dp_rockchip_hpd_sw_cfg(void *data, bool hpd)
+{
+	struct rockchip_dw_dp *dp = data;
+	u32 hpd_reg = dp->pdata->hpd_reg[dp->id];
+
+	dev_dbg(dp->dev, "Force HPD connected=%s\n", str_yes_no(hpd));
+
+	dp->hpd_cfg = hpd;
+
+	regmap_write(dp->vo_grf, hpd_reg,
+		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_CFG, dp->hpd_cfg));
+}
+
 static int dw_dp_encoder_atomic_check(struct drm_encoder *encoder,
 				      struct drm_crtc_state *crtc_state,
 				      struct drm_connector_state *conn_state)
@@ -71,6 +116,34 @@ static const struct drm_encoder_helper_funcs dw_dp_encoder_helper_funcs = {
 	.atomic_check		= dw_dp_encoder_atomic_check,
 };
 
+static struct regmap *dp_dp_rockchip_get_vo_grf(struct rockchip_dw_dp *dp)
+{
+	struct device_node *np = dev_of_node(dp->dev);
+	struct of_phandle_args args;
+	struct regmap *regmap;
+	int ret;
+
+	ret = of_parse_phandle_with_args(np, "phys", "#phy-cells", 0, &args);
+	if (ret)
+		return ERR_PTR(-ENODEV);
+
+	/*
+	 * Limit this workaround to RK3576 and RK3588, new platforms should
+	 * add a VO GRF phandle in the DisplayPort DT node.
+	 */
+	if (!of_device_is_compatible(args.np, "rockchip,rk3576-usbdp-phy") &&
+	    !of_device_is_compatible(args.np, "rockchip,rk3588-usbdp-phy")) {
+		regmap = ERR_PTR(-ENODEV);
+		goto out_put_node;
+	}
+
+	regmap = syscon_regmap_lookup_by_phandle(args.np, "rockchip,vo-grf");
+
+out_put_node:
+	of_node_put(args.np);
+	return regmap;
+}
+
 static int dw_dp_rockchip_bind(struct device *dev, struct device *master, void *data)
 {
 	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
@@ -121,19 +194,53 @@ static const struct component_ops dw_dp_rockchip_component_ops = {
 
 static int dw_dp_rockchip_probe(struct platform_device *pdev)
 {
-	const struct dw_dp_plat_data *plat_data;
+	const struct rockchip_dw_dp_plat_data *plat_data_const;
+	struct dw_dp_plat_data *plat_data;
 	struct device *dev = &pdev->dev;
 	struct rockchip_dw_dp *dp;
+	struct resource *res;
+	int id;
 
-	plat_data = of_device_get_match_data(dev);
-	if (!plat_data)
+	plat_data_const = device_get_match_data(dev);
+	if (!plat_data_const)
 		return -ENODEV;
 
+	plat_data = devm_kzalloc(dev, sizeof(*plat_data), GFP_KERNEL);
+	if (!plat_data)
+		return -ENOMEM;
+
 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 	if (!dp)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, dp);
 	dp->dev = dev;
+	dp->pdata = plat_data_const;
+
+	res = platform_get_mem_or_io(pdev, 0);
+	if (!res)
+		return -ENODEV;
+
+	/* find the DisplayPort ID from the io address */
+	dp->id = -ENODEV;
+	for (id = 0; id < plat_data_const->num_ctrls; id++) {
+		if (res->start == plat_data_const->ctrl_ids[id]) {
+			dp->id = id;
+			break;
+		}
+	}
+
+	if (dp->id < 0)
+		return dp->id;
+
+	dp->vo_grf = dp_dp_rockchip_get_vo_grf(dp);
+	if (IS_ERR(dp->vo_grf))
+		return PTR_ERR(dp->vo_grf);
+
+	plat_data->max_link_rate = plat_data_const->max_link_rate;
+	plat_data->pixel_mode = plat_data_const->pixel_mode;
+	plat_data->hpd_sw_sel = dw_dp_rockchip_hpd_sw_sel;
+	plat_data->hpd_sw_cfg = dw_dp_rockchip_hpd_sw_cfg;
+	plat_data->data = dp;
 
 	dp->base = dw_dp_probe(pdev, plat_data);
 	if (IS_ERR(dp->base))
@@ -147,14 +254,20 @@ static void dw_dp_rockchip_remove(struct platform_device *pdev)
 	component_del(&pdev->dev, &dw_dp_rockchip_component_ops);
 }
 
-static const struct dw_dp_plat_data rk3588_dp_plat_data = {
+static const struct rockchip_dw_dp_plat_data rk3588_dp_plat_data = {
+	.num_ctrls = 2,
+	.ctrl_ids = {0xfde50000, 0xfde60000},
 	.max_link_rate = 810000,
 	.pixel_mode = DW_DP_MP_QUAD_PIXEL,
+	.hpd_reg = {0x0000, 0x0008},
 };
 
-static const struct dw_dp_plat_data rk3576_dp_plat_data = {
+static const struct rockchip_dw_dp_plat_data rk3576_dp_plat_data = {
+	.num_ctrls = 1,
+	.ctrl_ids = {0x27e40000},
 	.max_link_rate = 810000,
 	.pixel_mode = DW_DP_MP_DUAL_PIXEL,
+	.hpd_reg = {0x0000},
 };
 
 static const struct of_device_id dw_dp_of_match[] = {

-- 
2.53.0


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[PATCH v4 07/10] drm/bridge: synopsys: dw-dp: Add Runtime PM support

[Sebastian Reichel]

Add runtime PM stubs to the Synopsys DesignWare DisplayPort bridge
driver. Support is not enabled automatically and must be hooked up
in the vendor specific glue code.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c | 50 +++++++++++++++++++++++++++++++++
 include/drm/bridge/dw_dp.h              |  3 ++
 2 files changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index 8eb2699dc7ab..636b9e105297 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -328,6 +328,7 @@ struct dw_dp {
 	struct dw_dp_link link;
 	struct dw_dp_plat_data plat_data;
 	u8 pixel_mode;
+	bool usbc_mode;
 
 	struct drm_bridge *next_bridge;
 
@@ -1467,6 +1468,8 @@ static ssize_t dw_dp_aux_transfer(struct drm_dp_aux *aux,
 	if (WARN_ON(msg->size > 16))
 		return -E2BIG;
 
+	ACQUIRE(pm_runtime_active_auto, pm)(dp->dev);
+
 	switch (msg->request & ~DP_AUX_I2C_MOT) {
 	case DP_AUX_NATIVE_WRITE:
 	case DP_AUX_I2C_WRITE:
@@ -1657,6 +1660,8 @@ static void dw_dp_bridge_atomic_enable(struct drm_bridge *bridge,
 	struct drm_connector_state *conn_state;
 	int ret;
 
+	pm_runtime_get_sync(dp->dev);
+
 	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 	if (!connector) {
 		dev_err(dp->dev, "failed to get connector\n");
@@ -1711,6 +1716,7 @@ static void dw_dp_bridge_atomic_disable(struct drm_bridge *bridge,
 	dw_dp_link_disable(dp);
 	bitmap_zero(dp->sdp_reg_bank, SDP_REG_BANK_SIZE);
 	dw_dp_reset(dp);
+	pm_runtime_put_autosuspend(dp->dev);
 }
 
 static bool dw_dp_hpd_detect_link(struct dw_dp *dp, struct drm_connector *connector)
@@ -1731,6 +1737,14 @@ static enum drm_connector_status dw_dp_bridge_detect(struct drm_bridge *bridge,
 {
 	struct dw_dp *dp = bridge_to_dp(bridge);
 
+	ACQUIRE(pm_runtime_active_auto, pm)(dp->dev);
+
+	/*
+	 * HPD_HOT_PLUG bit is asserted only after the sink holds HPD high for
+	 * at least 100ms. Thus we need to wait 100ms after runtime PM resume.
+	 */
+	msleep(110);
+
 	if (!dw_dp_hpd_detect(dp))
 		return connector_status_disconnected;
 
@@ -2032,10 +2046,15 @@ int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder)
 	}
 
 	if (dw_dp_is_routed_to_usb_c(encoder)) {
+		dp->usbc_mode = true;
 		dev_dbg(dev, "USB-C mode\n");
 
 		if (dp->plat_data.hpd_sw_sel)
 			dp->plat_data.hpd_sw_sel(dp->plat_data.data, 1);
+	} else {
+		dp->usbc_mode = false;
+		/* Keep runtime PM enabled to have working native HPD IRQ */
+		pm_runtime_get_sync(dp->dev);
 	}
 
 	dw_dp_init_hw(dp);
@@ -2065,6 +2084,8 @@ EXPORT_SYMBOL_GPL(dw_dp_bind);
 
 void dw_dp_unbind(struct dw_dp *dp)
 {
+	if (dp->usbc_mode)
+		pm_runtime_put_autosuspend(dp->dev);
 	disable_irq(dp->irq);
 	phy_exit(dp->phy);
 	drm_bridge_put(dp->next_bridge);
@@ -2163,6 +2184,35 @@ struct dw_dp *dw_dp_probe(struct platform_device *pdev, const struct dw_dp_plat_
 }
 EXPORT_SYMBOL_GPL(dw_dp_probe);
 
+int dw_dp_runtime_suspend(struct dw_dp *dp)
+{
+	clk_disable_unprepare(dp->aux_clk);
+	clk_disable_unprepare(dp->apb_clk);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dw_dp_runtime_suspend);
+
+int dw_dp_runtime_resume(struct dw_dp *dp)
+{
+	int ret;
+
+	ret = clk_prepare_enable(dp->apb_clk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(dp->aux_clk);
+	if (ret) {
+		clk_disable_unprepare(dp->apb_clk);
+		return ret;
+	}
+
+	dw_dp_init_hw(dp);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dw_dp_runtime_resume);
+
 MODULE_AUTHOR("Andy Yan <andyshrk@163.com>");
 MODULE_DESCRIPTION("DW DP Core Library");
 MODULE_LICENSE("GPL");
diff --git a/include/drm/bridge/dw_dp.h b/include/drm/bridge/dw_dp.h
index 79b2cdf0df99..f20d2c2c40ca 100644
--- a/include/drm/bridge/dw_dp.h
+++ b/include/drm/bridge/dw_dp.h
@@ -29,4 +29,7 @@ int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder);
 void dw_dp_unbind(struct dw_dp *dp);
 
 struct dw_dp *dw_dp_probe(struct platform_device *pdev, const struct dw_dp_plat_data *plat_data);
+
+int dw_dp_runtime_suspend(struct dw_dp *dp);
+int dw_dp_runtime_resume(struct dw_dp *dp);
 #endif /* __DW_DP__ */

-- 
2.53.0


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[PATCH v4 08/10] drm/rockchip: dw_dp: Add runtime PM support

[Sebastian Reichel]

Add support for runtime PM to the Rockchip RK3576/3588 Synopsys
DesignWare DisplayPort driver.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c | 53 +++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
index 0ecbad24dd4e..d7e1704fd980 100644
--- a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
@@ -12,6 +12,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/videodev2.h>
 
@@ -57,6 +58,8 @@ static void dw_dp_rockchip_hpd_sw_sel(void *data, bool force_hpd_from_sw)
 
 	dp->hpd_sel = force_hpd_from_sw;
 
+	ACQUIRE(pm_runtime_active_auto, pm)(dp->dev);
+
 	regmap_write(dp->vo_grf, hpd_reg,
 		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_SEL, dp->hpd_sel));
 }
@@ -70,6 +73,8 @@ static void dw_dp_rockchip_hpd_sw_cfg(void *data, bool hpd)
 
 	dp->hpd_cfg = hpd;
 
+	ACQUIRE(pm_runtime_active_auto, pm)(dp->dev);
+
 	regmap_write(dp->vo_grf, hpd_reg,
 		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_CFG, dp->hpd_cfg));
 }
@@ -169,14 +174,25 @@ static int dw_dp_rockchip_bind(struct device *dev, struct device *master, void *
 	if (ret)
 		return ret;
 
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, 500);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	connector = drm_bridge_connector_init(drm_dev, encoder);
 	if (IS_ERR(connector)) {
-		dw_dp_unbind(dp->base);
-		return dev_err_probe(dev, PTR_ERR(connector),
-				     "Failed to init bridge connector\n");
+		ret = PTR_ERR(connector);
+		dev_err_probe(dev, ret, "Failed to init bridge connector\n");
+		goto error;
 	}
 
 	return 0;
+
+error:
+	pm_runtime_dont_use_autosuspend(dev);
+	pm_runtime_disable(dev);
+	dw_dp_unbind(dp->base);
+	return ret;
 }
 
 static void dw_dp_rockchip_unbind(struct device *dev, struct device *master,
@@ -184,6 +200,8 @@ static void dw_dp_rockchip_unbind(struct device *dev, struct device *master,
 {
 	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
 
+	pm_runtime_dont_use_autosuspend(dev);
+	pm_runtime_disable(dev);
 	dw_dp_unbind(dp->base);
 }
 
@@ -254,6 +272,34 @@ static void dw_dp_rockchip_remove(struct platform_device *pdev)
 	component_del(&pdev->dev, &dw_dp_rockchip_component_ops);
 }
 
+static int dw_dp_rockchip_runtime_suspend(struct device *dev)
+{
+	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
+
+	return dw_dp_runtime_suspend(dp->base);
+}
+
+static int dw_dp_rockchip_runtime_resume(struct device *dev)
+{
+	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
+	u32 hpd_reg = dp->pdata->hpd_reg[dp->id];
+	int ret;
+
+	ret = dw_dp_runtime_resume(dp->base);
+	if (ret)
+		return ret;
+
+	regmap_write(dp->vo_grf, hpd_reg,
+		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_SEL, dp->hpd_sel) |
+		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_CFG, dp->hpd_cfg));
+
+	return 0;
+}
+
+static const struct dev_pm_ops dw_dp_pm_ops = {
+	RUNTIME_PM_OPS(dw_dp_rockchip_runtime_suspend, dw_dp_rockchip_runtime_resume, NULL)
+};
+
 static const struct rockchip_dw_dp_plat_data rk3588_dp_plat_data = {
 	.num_ctrls = 2,
 	.ctrl_ids = {0xfde50000, 0xfde60000},
@@ -288,5 +334,6 @@ struct platform_driver dw_dp_driver = {
 	.driver = {
 		.name = "dw-dp",
 		.of_match_table = dw_dp_of_match,
+		.pm = pm_ptr(&dw_dp_pm_ops),
 	},
 };

-- 
2.53.0


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[PATCH v4 09/10] dt-bindings: display: rockchip: dw-dp: Fix sound DAI cells

[Sebastian Reichel]

The RK3588 and RK3576 DesignWare DisplayPort controllers both have two
possible DAI interfaces: I2S and S/PDIF. Thus an argument is needed to
to select the right interface.

In addition to that the RK3576 has the same IP as RK3588, but configured
with Multi Stream Transport (MST) enabled for up to 3 displays and thus
has a total of 6 DAI interfaces (I2S and S/PDIF for each possible
stream). Meanwhile the RK3588 does not support MST and thus has only 2
DAI interfaces.

The binding update from this patch has only been tested with the simple
single stream transport (SST) setup as the Linux driver does not yet
support MST.

For MST it is unclear what a good binding should look like. Technically
there are a couple of options:

1. Stay with the single cell, but add more numbers. I.e.
   0 = I2S on stream 0,
   1 = S/PDIF on stream 0
   2 = I2S on stream 1,
   3 = S/PDIF on stream 1
   4 = I2S on stream 2,
   5 = S/PDIF on stream 2

2. Add yet another cell, so that there is one argument for the stream ID
   and one argument to select between S/PDIF and I2S. I.e.
   0 0 = I2S on stream 0
   0 1 = S/PDIF on stream 0
   1 0 = I2S on stream 1
   1 1 = S/PDIF on stream 1
   2 0 = I2S on stream 2
   2 1 = S/PDIF on stream 2

3. Create one subnode for each stream in the DP controller with its
   own graph for the video streams. This would mean the MST binding
   is quite different from the SST one.

As it is unclear which way is the most sensible at this point in time,
just go with the most simple option for now and revisit this once MST
is added.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 .../devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml     | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
index 2b0d9e23e943..c4f8959dd65d 100644
--- a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
+++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
@@ -25,7 +25,7 @@ description: |
   * Supports up to 8/10 bits per color component
   * Supports RBG, YCbCr4:4:4, YCbCr4:2:2, YCbCr4:2:0
   * Pixel clock up to 594MHz
-  * I2S, SPDIF audio interface
+  * I2S, S/PDIF audio interface
 
 properties:
   compatible:
@@ -46,7 +46,7 @@ properties:
       - description: DisplayPort AUX clock
       - description: HDCP clock
       - description: I2S interface clock
-      - description: SPDIF interfce clock
+      - description: S/PDIF interfce clock
 
   clock-names:
     minItems: 3
@@ -83,7 +83,8 @@ properties:
     maxItems: 1
 
   "#sound-dai-cells":
-    const: 0
+    const: 1
+    description: 0 for I2S, 1 for S/PDIF
 
 required:
   - compatible
@@ -144,7 +145,7 @@ examples:
         resets = <&cru SRST_DP0>;
         phys = <&usbdp_phy0 PHY_TYPE_DP>;
         power-domains = <&power RK3588_PD_VO0>;
-        #sound-dai-cells = <0>;
+        #sound-dai-cells = <1>;
 
         ports {
           #address-cells = <1>;

-- 
2.53.0


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[PATCH v4 10/10] drm/bridge: synopsys: dw-dp: Add audio support

[Sebastian Reichel]

Implement audio support for the Synopsys DesignWare DisplayPort
controller.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-dp.c | 230 +++++++++++++++++++++++++++++++-
 1 file changed, 229 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
index 636b9e105297..8d6a52135e54 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c
@@ -23,17 +23,21 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_bridge_connector.h>
 #include <drm/display/drm_dp_helper.h>
+#include <drm/display/drm_hdmi_audio_helper.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_of.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
 
+#include <sound/hdmi-codec.h>
+
 #define DW_DP_VERSION_NUMBER			0x0000
 #define DW_DP_VERSION_TYPE			0x0004
 #define DW_DP_ID				0x0008
 
 #define DW_DP_CONFIG_REG1			0x0100
+#define AUDIO_SELECT				GENMASK(2, 1)
 #define DW_DP_CONFIG_REG2			0x0104
 #define DW_DP_CONFIG_REG3			0x0108
 
@@ -110,6 +114,10 @@
 #define HBR_MODE_ENABLE				BIT(10)
 #define AUDIO_DATA_WIDTH			GENMASK(9, 5)
 #define AUDIO_DATA_IN_EN			GENMASK(4, 1)
+#define AUDIO_DATA_IN_EN_CHANNEL12		BIT(0)
+#define AUDIO_DATA_IN_EN_CHANNEL34		BIT(1)
+#define AUDIO_DATA_IN_EN_CHANNEL56		BIT(2)
+#define AUDIO_DATA_IN_EN_CHANNEL78		BIT(3)
 #define AUDIO_INF_SELECT			BIT(0)
 
 #define DW_DP_SDP_VERTICAL_CTRL			0x0500
@@ -253,6 +261,8 @@
 
 #define SDP_REG_BANK_SIZE			16
 
+#define DW_DP_SDP_VERSION			0x12
+
 struct dw_dp_link_caps {
 	bool enhanced_framing;
 	bool tps3_supported;
@@ -305,6 +315,19 @@ struct dw_dp_hotplug {
 	bool long_hpd;
 };
 
+enum dw_dp_audio_interface_support {
+	DW_DP_AUDIO_I2S_ONLY = 0,
+	DW_DP_AUDIO_SPDIF_ONLY = 1,
+	DW_DP_AUDIO_I2S_AND_SPDIF = 2,
+	DW_DP_AUDIO_NONE = 3,
+};
+
+enum dw_dp_audio_interface {
+	DW_DP_AUDIO_I2S = 0,
+	DW_DP_AUDIO_SPDIF = 1,
+	DW_DP_AUDIO_UNUSED,
+};
+
 struct dw_dp {
 	struct drm_bridge bridge;
 	struct device *dev;
@@ -320,6 +343,8 @@ struct dw_dp {
 	int irq;
 	struct work_struct hpd_work;
 	struct dw_dp_hotplug hotplug;
+	enum dw_dp_audio_interface audio_interface;
+	int audio_channels;
 	/* Serialize hpd status access */
 	struct mutex irq_lock;
 
@@ -1846,6 +1871,195 @@ static void dw_dp_bridge_oob_notify(struct drm_bridge *bridge,
 		dev_err_once(dp->dev, "Missing platform handler for OOB HPD handling\n");
 }
 
+static int dw_dp_audio_infoframe_send(struct dw_dp *dp)
+{
+	struct hdmi_audio_infoframe frame;
+	struct dw_dp_sdp sdp;
+	int ret;
+
+	ret = hdmi_audio_infoframe_init(&frame);
+	if (ret < 0)
+		return ret;
+
+	frame.coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
+	frame.sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
+	frame.sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
+	frame.channels = dp->audio_channels;
+
+	ret = hdmi_audio_infoframe_pack_for_dp(&frame, &sdp.base, DW_DP_SDP_VERSION);
+	if (ret < 0)
+		return ret;
+
+	sdp.flags = DW_DP_SDP_VERTICAL_INTERVAL;
+
+	return dw_dp_send_sdp(dp, &sdp);
+}
+
+static int dw_dp_audio_startup(struct drm_bridge *bridge,
+			       struct drm_connector *connector)
+{
+	struct dw_dp *dp = bridge_to_dp(bridge);
+
+	dev_dbg(dp->dev, "audio startup\n");
+
+	return pm_runtime_resume_and_get(dp->dev);
+}
+
+static void dw_dp_audio_unprepare(struct drm_bridge *bridge,
+				  struct drm_connector *connector)
+{
+	struct dw_dp *dp = bridge_to_dp(bridge);
+
+	/* Disable all audio streams */
+	regmap_update_bits(dp->regmap, DW_DP_AUD_CONFIG1, AUDIO_DATA_IN_EN,
+			   FIELD_PREP(AUDIO_DATA_IN_EN, 0));
+
+	if (dp->audio_interface == DW_DP_AUDIO_SPDIF)
+		clk_disable_unprepare(dp->spdif_clk);
+	else if (dp->audio_interface == DW_DP_AUDIO_I2S)
+		clk_disable_unprepare(dp->i2s_clk);
+
+	dp->audio_interface = DW_DP_AUDIO_UNUSED;
+}
+
+static int dw_dp_audio_prepare(struct drm_bridge *bridge,
+			       struct drm_connector *connector,
+			       struct hdmi_codec_daifmt *daifmt,
+			       struct hdmi_codec_params *params)
+{
+	struct dw_dp *dp = bridge_to_dp(bridge);
+	u8 audio_data_in_en, supported_audio_interfaces;
+	enum dw_dp_audio_interface audio_interface;
+	u32 cfg1;
+	int ret;
+
+	/*
+	 * prepare might be called multiple times, so release the clocks
+	 * from previous calls to keep the calls in balance.
+	 */
+	if (dp->audio_interface != DW_DP_AUDIO_UNUSED)
+		dw_dp_audio_unprepare(bridge, connector);
+
+	dp->audio_channels = params->cea.channels;
+	switch (params->cea.channels) {
+	case 1:
+	case 2:
+		audio_data_in_en = AUDIO_DATA_IN_EN_CHANNEL12;
+		break;
+	case 8:
+		audio_data_in_en = AUDIO_DATA_IN_EN_CHANNEL12 |
+				   AUDIO_DATA_IN_EN_CHANNEL34 |
+				   AUDIO_DATA_IN_EN_CHANNEL56 |
+				   AUDIO_DATA_IN_EN_CHANNEL78;
+		break;
+	default:
+		dev_err(dp->dev, "invalid audio channels %d\n", dp->audio_channels);
+		return -EINVAL;
+	}
+
+	switch (daifmt->fmt) {
+	case HDMI_SPDIF:
+		audio_interface = DW_DP_AUDIO_SPDIF;
+		break;
+	case HDMI_I2S:
+		/*
+		 * It is recommended to use SPDIF instead of I2S, since I2S mode requires
+		 * manually inserting PCUV control bits from userspace and this is done
+		 * automatically in hardware for SPDIF mode.
+		 */
+		audio_interface = DW_DP_AUDIO_I2S;
+		break;
+	default:
+		dev_err(dp->dev, "invalid DAI format %d\n", daifmt->fmt);
+		return -EINVAL;
+	}
+
+	regmap_read(dp->regmap, DW_DP_CONFIG_REG1, &cfg1);
+	supported_audio_interfaces = FIELD_GET(AUDIO_SELECT, cfg1);
+
+	if (supported_audio_interfaces != DW_DP_AUDIO_I2S_AND_SPDIF &&
+	    supported_audio_interfaces != audio_interface) {
+		dev_err(dp->dev, "unsupported DAI %d\n", daifmt->fmt);
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dp->spdif_clk);
+	if (ret)
+		return ret;
+
+	clk_prepare_enable(dp->i2s_clk);
+	if (ret) {
+		clk_disable_unprepare(dp->spdif_clk);
+		return ret;
+	}
+
+	regmap_update_bits(dp->regmap, DW_DP_AUD_CONFIG1,
+			   AUDIO_DATA_IN_EN | NUM_CHANNELS | AUDIO_DATA_WIDTH |
+			   AUDIO_INF_SELECT | HBR_MODE_ENABLE,
+			   FIELD_PREP(AUDIO_DATA_IN_EN, audio_data_in_en) |
+			   FIELD_PREP(NUM_CHANNELS, dp->audio_channels - 1) |
+			   FIELD_PREP(AUDIO_DATA_WIDTH, params->sample_width) |
+			   FIELD_PREP(AUDIO_INF_SELECT, audio_interface) |
+			   FIELD_PREP(HBR_MODE_ENABLE, 0));
+
+	/* Wait for inf switch */
+	usleep_range(20, 40);
+
+	if (audio_interface == DW_DP_AUDIO_I2S)
+		clk_disable_unprepare(dp->spdif_clk);
+	else if (audio_interface == DW_DP_AUDIO_SPDIF)
+		clk_disable_unprepare(dp->i2s_clk);
+
+	dp->audio_interface = audio_interface;
+
+	/*
+	 * Send audio stream during vertical and horizontal blanking periods.
+	 * Send out audio timestamp SDP once per video frame during the vertical
+	 * blanking period
+	 */
+	regmap_update_bits(dp->regmap, DW_DP_SDP_VERTICAL_CTRL,
+			   EN_AUDIO_STREAM_SDP | EN_AUDIO_TIMESTAMP_SDP,
+			   FIELD_PREP(EN_AUDIO_STREAM_SDP, 1) |
+			   FIELD_PREP(EN_AUDIO_TIMESTAMP_SDP, 1));
+	regmap_update_bits(dp->regmap, DW_DP_SDP_HORIZONTAL_CTRL,
+			   EN_AUDIO_STREAM_SDP,
+			   FIELD_PREP(EN_AUDIO_STREAM_SDP, 1));
+
+	ret = dw_dp_audio_infoframe_send(dp);
+	if (ret < 0)
+		dev_err(dp->dev, "failed to send audio infoframe\n");
+
+	dev_dbg(dp->dev, "audio prepare with %d channels using DAI=%d\n",
+		dp->audio_channels, dp->audio_interface);
+
+	return 0;
+}
+
+static void dw_dp_audio_shutdown(struct drm_bridge *bridge,
+				 struct drm_connector *connector)
+{
+	struct dw_dp *dp = bridge_to_dp(bridge);
+
+	dev_dbg(dp->dev, "audio shutdown\n");
+
+	dw_dp_audio_unprepare(bridge, connector);
+	pm_runtime_put_autosuspend(dp->dev);
+}
+
+static int dw_dp_audio_mute_stream(struct drm_bridge *bridge,
+				   struct drm_connector *connector,
+				   bool enable, int direction)
+{
+	struct dw_dp *dp = bridge_to_dp(bridge);
+
+	dev_dbg(dp->dev, "audio %smute\n", enable ? "" : "un");
+
+	regmap_update_bits(dp->regmap, DW_DP_AUD_CONFIG1, AUDIO_MUTE,
+			   FIELD_PREP(AUDIO_MUTE, enable));
+
+	return 0;
+}
+
 static const struct drm_bridge_funcs dw_dp_bridge_funcs = {
 	.atomic_duplicate_state = dw_dp_bridge_atomic_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -1859,6 +2073,11 @@ static const struct drm_bridge_funcs dw_dp_bridge_funcs = {
 	.detect = dw_dp_bridge_detect,
 	.edid_read = dw_dp_bridge_edid_read,
 	.oob_notify = dw_dp_bridge_oob_notify,
+
+	.dp_audio_startup = dw_dp_audio_startup,
+	.dp_audio_prepare = dw_dp_audio_prepare,
+	.dp_audio_shutdown = dw_dp_audio_shutdown,
+	.dp_audio_mute_stream = dw_dp_audio_mute_stream,
 };
 
 static int dw_dp_link_retrain(struct dw_dp *dp)
@@ -2009,10 +2228,19 @@ int dw_dp_bind(struct dw_dp *dp, struct drm_encoder *encoder)
 
 	bridge = &dp->bridge;
 	bridge->of_node = dev->of_node;
-	bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
+	bridge->ops = DRM_BRIDGE_OP_DP_AUDIO |
+		      DRM_BRIDGE_OP_DETECT |
+		      DRM_BRIDGE_OP_EDID |
+		      DRM_BRIDGE_OP_HPD;
 	bridge->type = DRM_MODE_CONNECTOR_DisplayPort;
 	bridge->ycbcr_420_allowed = true;
 
+	dp->audio_interface = DW_DP_AUDIO_UNUSED;
+	bridge->hdmi_audio_dev = dev;
+	bridge->hdmi_audio_max_i2s_playback_channels = 8;
+	bridge->hdmi_audio_dai_port = 1;
+	bridge->hdmi_audio_spdif_playback = true;
+
 	drm_bridge_add(bridge);
 
 	dp->aux.dev = dev;

-- 
2.53.0


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Re: [PATCH v4 09/10] dt-bindings: display: rockchip: dw-dp: Fix sound DAI cells

[Krzysztof Kozlowski]

On Tue, Jul 21, 2026 at 07:52:39PM +0200, Sebastian Reichel wrote:
> The RK3588 and RK3576 DesignWare DisplayPort controllers both have two
> possible DAI interfaces: I2S and S/PDIF. Thus an argument is needed to
> to select the right interface.
> 
> In addition to that the RK3576 has the same IP as RK3588, but configured
> with Multi Stream Transport (MST) enabled for up to 3 displays and thus
> has a total of 6 DAI interfaces (I2S and S/PDIF for each possible
> stream). Meanwhile the RK3588 does not support MST and thus has only 2
> DAI interfaces.
> 
> The binding update from this patch has only been tested with the simple
> single stream transport (SST) setup as the Linux driver does not yet
> support MST.
> 
> For MST it is unclear what a good binding should look like. Technically
> there are a couple of options:
> 
> 1. Stay with the single cell, but add more numbers. I.e.
>    0 = I2S on stream 0,
>    1 = S/PDIF on stream 0
>    2 = I2S on stream 1,
>    3 = S/PDIF on stream 1
>    4 = I2S on stream 2,
>    5 = S/PDIF on stream 2

This looks simpler and anyway the numbers are abstract, so they do not
need to match "stream X".

> 
> 2. Add yet another cell, so that there is one argument for the stream ID
>    and one argument to select between S/PDIF and I2S. I.e.
>    0 0 = I2S on stream 0
>    0 1 = S/PDIF on stream 0
>    1 0 = I2S on stream 1
>    1 1 = S/PDIF on stream 1
>    2 0 = I2S on stream 2
>    2 1 = S/PDIF on stream 2
> 
> 3. Create one subnode for each stream in the DP controller with its
>    own graph for the video streams. This would mean the MST binding
>    is quite different from the SST one.
> 
> As it is unclear which way is the most sensible at this point in time,
> just go with the most simple option for now and revisit this once MST
> is added.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  .../devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml     | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
> index 2b0d9e23e943..c4f8959dd65d 100644
> --- a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
> @@ -25,7 +25,7 @@ description: |
>    * Supports up to 8/10 bits per color component
>    * Supports RBG, YCbCr4:4:4, YCbCr4:2:2, YCbCr4:2:0
>    * Pixel clock up to 594MHz
> -  * I2S, SPDIF audio interface
> +  * I2S, S/PDIF audio interface
>  
>  properties:
>    compatible:
> @@ -46,7 +46,7 @@ properties:
>        - description: DisplayPort AUX clock
>        - description: HDCP clock
>        - description: I2S interface clock
> -      - description: SPDIF interfce clock
> +      - description: S/PDIF interfce clock
>  
>    clock-names:
>      minItems: 3
> @@ -83,7 +83,8 @@ properties:
>      maxItems: 1
>  
>    "#sound-dai-cells":
> -    const: 0
> +    const: 1
> +    description: 0 for I2S, 1 for S/PDIF

This is ABI change, which might be backwards compatible or not, but
commit msg should explain that. I can easily imagine drivers where
written that way that they will fail with an old DTB.

Best regards,
Krzysztof


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Re: [PATCH v4 10/10] drm/bridge: synopsys: dw-dp: Add audio support

[Alexey Charkov]

Hi Sebastian,

On Tue, Jul 21, 2026 at 9:52 PM Sebastian Reichel
<sebastian.reichel@collabora.com> wrote:
>
> Implement audio support for the Synopsys DesignWare DisplayPort
> controller.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-dp.c | 230 +++++++++++++++++++++++++++++++-
>  1 file changed, 229 insertions(+), 1 deletion(-)

Thanks for your work on this!

Quick question. It looks like the audio-related change along with the
DT binding update is independent of the hotplug/PM part, and shouldn't
really depend on the (large!) USBDP PHY changes. Would it be possible
to split it out as a separate mini-series, so that the whole thing
doesn't have to wait for the fate of the USBDP PHY series?

Best regards,
Alexey

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Re: [PATCH v4 09/10] dt-bindings: display: rockchip: dw-dp: Fix sound DAI cells

[Sebastian Reichel]

[-- Attachment #1.1: Type: text/plain, Size: 2469 bytes --]

Hi,

On Wed, Jul 22, 2026 at 09:22:03AM +0200, Krzysztof Kozlowski wrote:
> > diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
> > index 2b0d9e23e943..c4f8959dd65d 100644
> > --- a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
> > +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
> > @@ -25,7 +25,7 @@ description: |
> >    * Supports up to 8/10 bits per color component
> >    * Supports RBG, YCbCr4:4:4, YCbCr4:2:2, YCbCr4:2:0
> >    * Pixel clock up to 594MHz
> > -  * I2S, SPDIF audio interface
> > +  * I2S, S/PDIF audio interface
> >  
> >  properties:
> >    compatible:
> > @@ -46,7 +46,7 @@ properties:
> >        - description: DisplayPort AUX clock
> >        - description: HDCP clock
> >        - description: I2S interface clock
> > -      - description: SPDIF interfce clock
> > +      - description: S/PDIF interfce clock
> >  
> >    clock-names:
> >      minItems: 3
> > @@ -83,7 +83,8 @@ properties:
> >      maxItems: 1
> >  
> >    "#sound-dai-cells":
> > -    const: 0
> > +    const: 1
> > +    description: 0 for I2S, 1 for S/PDIF
> 
> This is ABI change, which might be backwards compatible or not, but
> commit msg should explain that. I can easily imagine drivers where
> written that way that they will fail with an old DTB.

It sure is an ABI break on paper, but I don't think it makes sense
to have an enum allowing 0 or 1.

mainline kernel:
At the moment mainline RK3576 dtsi does not have any
#sound-dai-cells in its DP node and RK3588 has it set to <0>
(Which will complain after this change. I have a fix for that
updating it to <1>). But the mainline kernel has absolutely no
driver support for audio and doesn't use the property at all.
Not having the cell means the driver would have to assume that
either I2S or S/PDIF is meant implicitly. But that is also not
documented.

vendor kernel:
The only other driver for the DP controller that I am aware of is
from the vendor kernel tree. That does have #sound-dai-cells = 1 on
RK3588 and uses subnodes for RK3576 (and thus no #sound-dai-cells at
all).

Thus I argue this is a theoretical ABI break, which affects nothing.
I will look into adding this info to the commit message after
dropping the other ideas for <2> and the subnodes.

Greetings,

-- Sebastian

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