linux-kernel - [PATCH 4/4] drm/rockchip: dw_hdmi_qp: Do not send HPD events for all connectors

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Message-Id: <20251203-dw-hdmi-qp-scramb-v1-4-836fe7401a69@collabora.com>
Date: Wed, 03 Dec 2025 20:27:55 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Sandy Huang <hjc@...k-chips.com>, 
 Heiko Stübner <heiko@...ech.de>, 
 Andy Yan <andy.yan@...k-chips.com>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org
Subject: [PATCH 4/4] drm/rockchip: dw_hdmi_qp: Do not send HPD events for
 all connectors

In order to optimize the HPD event handling and run the detect cycle on
the affected connector only, make use of
drm_connector_helper_hpd_irq_event() instead of
drm_helper_hpd_irq_event().

Additionally, move devm_request_threaded_irq() after bridge connector
initialization.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 44 ++++++++++++--------------
 1 file changed, 20 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
index c9fe6aa3e3e3..a05f711f036a 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c
@@ -92,6 +92,7 @@ struct rockchip_hdmi_qp {
 	struct regmap *regmap;
 	struct regmap *vo_regmap;
 	struct rockchip_encoder encoder;
+	struct drm_connector *connector;
 	struct dw_hdmi_qp *hdmi;
 	struct phy *phy;
 	struct gpio_desc *frl_enable_gpio;
@@ -251,14 +252,10 @@ static void dw_hdmi_qp_rk3588_hpd_work(struct work_struct *work)
 	struct rockchip_hdmi_qp *hdmi = container_of(work,
 						     struct rockchip_hdmi_qp,
 						     hpd_work.work);
-	struct drm_device *drm = hdmi->encoder.encoder.dev;
-	bool changed;
+	bool changed = drm_connector_helper_hpd_irq_event(hdmi->connector);
 
-	if (drm) {
-		changed = drm_helper_hpd_irq_event(drm);
-		if (changed)
-			dev_dbg(hdmi->dev, "connector status changed\n");
-	}
+	if (changed)
+		dev_dbg(hdmi->dev, "connector status changed\n");
 }
 
 static irqreturn_t dw_hdmi_qp_rk3576_hardirq(int irq, void *dev_id)
@@ -475,13 +472,12 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
 	struct dw_hdmi_qp_plat_data plat_data = {};
 	const struct rockchip_hdmi_qp_cfg *cfg;
 	struct drm_device *drm = data;
-	struct drm_connector *connector;
 	struct drm_encoder *encoder;
 	struct rockchip_hdmi_qp *hdmi;
 	struct resource *res;
 	struct clk_bulk_data *clks;
 	struct clk *ref_clk;
-	int ret, irq, i;
+	int ret, hpd_irq, i;
 
 	if (!pdev->dev.of_node)
 		return -ENODEV;
@@ -582,17 +578,9 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
 	if (plat_data.cec_irq < 0)
 		return plat_data.cec_irq;
 
-	irq = platform_get_irq_byname(pdev, "hpd");
-	if (irq < 0)
-		return irq;
-
-	ret = devm_request_threaded_irq(hdmi->dev, irq,
-					cfg->ctrl_ops->hardirq_callback,
-					cfg->ctrl_ops->irq_callback,
-					IRQF_SHARED, "dw-hdmi-qp-hpd",
-					hdmi);
-	if (ret)
-		return ret;
+	hpd_irq = platform_get_irq_byname(pdev, "hpd");
+	if (hpd_irq < 0)
+		return hpd_irq;
 
 	drm_encoder_helper_add(encoder, &dw_hdmi_qp_rockchip_encoder_helper_funcs);
 	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
@@ -606,12 +594,20 @@ static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
 				     "Failed to bind dw-hdmi-qp");
 	}
 
-	connector = drm_bridge_connector_init(drm, encoder);
-	if (IS_ERR(connector))
-		return dev_err_probe(hdmi->dev, PTR_ERR(connector),
+	hdmi->connector = drm_bridge_connector_init(drm, encoder);
+	if (IS_ERR(hdmi->connector))
+		return dev_err_probe(hdmi->dev, PTR_ERR(hdmi->connector),
 				     "Failed to init bridge connector\n");
 
-	return drm_connector_attach_encoder(connector, encoder);
+	ret = drm_connector_attach_encoder(hdmi->connector, encoder);
+	if (ret)
+		return ret;
+
+	return devm_request_threaded_irq(hdmi->dev, hpd_irq,
+					 cfg->ctrl_ops->hardirq_callback,
+					 cfg->ctrl_ops->irq_callback,
+					 IRQF_SHARED, "dw-hdmi-qp-hpd",
+					 hdmi);
 }
 
 static void dw_hdmi_qp_rockchip_unbind(struct device *dev,

-- 
2.51.2