linux-kernel - [PATCH v5 12/20] drm/rockchip: analogix_dp: Add support to get panel from the DP AUX bus

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Message-Id: <20250109032725.1102465-13-damon.ding@rock-chips.com>
Date: Thu,  9 Jan 2025 11:27:17 +0800
From: Damon Ding <damon.ding@...k-chips.com>
To: heiko@...ech.de
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	rfoss@...nel.org,
	vkoul@...nel.org,
	sebastian.reichel@...labora.com,
	cristian.ciocaltea@...labora.com,
	l.stach@...gutronix.de,
	dmitry.baryshkov@...aro.org,
	andy.yan@...k-chips.com,
	hjc@...k-chips.com,
	algea.cao@...k-chips.com,
	kever.yang@...k-chips.com,
	dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	Damon Ding <damon.ding@...k-chips.com>
Subject: [PATCH v5 12/20] drm/rockchip: analogix_dp: Add support to get panel from the DP AUX bus

Move drm_of_find_panel_or_bridge() a little later and combine it with
component_add() into a new function rockchip_dp_link_panel(). The function
will serve as done_probing() callback of devm_of_dp_aux_populate_bus(),
aiding to support for obtaining the eDP panel via the DP AUX bus.

If failed to get the panel from the DP AUX bus, it will then try the other
way to get panel information through the platform bus.

In addition, use dev_err() instead of drm_err() in rockchip_dp_poweron()
, which will be called before rockchip_dp_bind().

Signed-off-by: Damon Ding <damon.ding@...k-chips.com>

---

Changes in v4:
- Use done_probing() to call drm_of_find_panel_or_bridge() and
  component_add() when getting panel from the DP AUX bus

Changes in v5:
- Use the functions exported by the Analogix side to get the pointers of
  struct analogix_dp_plat_data and struct drm_dp_aux.
- Use dev_err() instead of drm_err() in rockchip_dp_poweron().

---
 .../gpu/drm/rockchip/analogix_dp-rockchip.c   | 41 ++++++++++++++-----
 1 file changed, 30 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 0957d3c5d31d..3ae01b870f49 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -124,13 +124,13 @@ static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
 
 	ret = clk_prepare_enable(dp->pclk);
 	if (ret < 0) {
-		drm_err(dp->drm_dev, "failed to enable pclk %d\n", ret);
+		dev_err(dp->dev, "failed to enable pclk %d\n", ret);
 		return ret;
 	}
 
 	ret = rockchip_dp_pre_init(dp);
 	if (ret < 0) {
-		drm_err(dp->drm_dev, "failed to dp pre init %d\n", ret);
+		dev_err(dp->dev, "failed to dp pre init %d\n", ret);
 		clk_disable_unprepare(dp->pclk);
 		return ret;
 	}
@@ -392,11 +392,27 @@ static const struct component_ops rockchip_dp_component_ops = {
 	.unbind = rockchip_dp_unbind,
 };
 
+static int rockchip_dp_link_panel(struct drm_dp_aux *aux)
+{
+	struct analogix_dp_plat_data *plat_data = analogix_dp_aux_to_plat_data(aux);
+	struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(dp->dev->of_node, 1, 0, &plat_data->panel, NULL);
+	if (ret)
+		return ret;
+
+	ret = component_add(dp->dev, &rockchip_dp_component_ops);
+	if (ret)
+		return ret;
+
+	return ret;
+}
+
 static int rockchip_dp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	const struct rockchip_dp_chip_data *dp_data;
-	struct drm_panel *panel = NULL;
 	struct rockchip_dp_device *dp;
 	struct resource *res;
 	int i;
@@ -406,10 +422,6 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 	if (!dp_data)
 		return -ENODEV;
 
-	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
-	if (ret < 0)
-		return ret;
-
 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 	if (!dp)
 		return -ENOMEM;
@@ -433,7 +445,6 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 
 	dp->dev = dev;
 	dp->adp = ERR_PTR(-ENODEV);
-	dp->plat_data.panel = panel;
 	dp->plat_data.dev_type = dp->data->chip_type;
 	dp->plat_data.power_on = rockchip_dp_poweron;
 	dp->plat_data.power_off = rockchip_dp_powerdown;
@@ -449,9 +460,17 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 	if (IS_ERR(dp->adp))
 		return PTR_ERR(dp->adp);
 
-	ret = component_add(dev, &rockchip_dp_component_ops);
-	if (ret)
-		return ret;
+	ret = devm_of_dp_aux_populate_bus(analogix_dp_get_aux(dp->adp), rockchip_dp_link_panel);
+	if (ret) {
+		if (ret != -ENODEV) {
+			dev_err(dev, "failed to populate aux bus : %d\n", ret);
+			return ret;
+		}
+
+		ret = rockchip_dp_link_panel(analogix_dp_get_aux(dp->adp));
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }
-- 
2.34.1