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From:   Samuel Holland <samuel@sholland.org>
To:     Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>
Cc:     Samuel Holland <samuel@sholland.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        "H. Nikolaus Schaller" <hns@goldelico.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Paul Cercueil <paul@crapouillou.net>,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-sunxi@lists.linux.dev
Subject: [PATCH] drm/sun4i: dw-hdmi: Fix ddc-en GPIO consumer conflict
Date:   Tue, 14 Jun 2022 02:31:00 -0500
Message-Id: <20220614073100.11550-1-samuel@sholland.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

commit 6de79dd3a920 ("drm/bridge: display-connector: add ddc-en gpio
support") added a consumer for this GPIO in the HDMI connector device.
This new consumer conflicts with the pre-existing GPIO consumer in the
sun8i HDMI controller driver, which prevents the driver from probing:

  [    4.983358] display-connector connector: GPIO lookup for consumer ddc-en
  [    4.983364] display-connector connector: using device tree for GPIO lookup
  [    4.983392] gpio-226 (ddc-en): gpiod_request: status -16
  [    4.983399] sun8i-dw-hdmi 6000000.hdmi: Couldn't get ddc-en gpio
  [    4.983618] sun4i-drm display-engine: failed to bind 6000000.hdmi (ops sun8i_dw_hdmi_ops [sun8i_drm_hdmi]): -16
  [    4.984082] sun4i-drm display-engine: Couldn't bind all pipelines components
  [    4.984171] sun4i-drm display-engine: adev bind failed: -16
  [    4.984179] sun8i-dw-hdmi: probe of 6000000.hdmi failed with error -16

Both drivers have the same behavior: they leave the GPIO active for the
life of the device. Let's take advantage of the new implementation, and
drop the now-obsolete code from the HDMI controller driver.

Fixes: 6de79dd3a920 ("drm/bridge: display-connector: add ddc-en gpio support")
Signed-off-by: Samuel Holland <samuel@sholland.org>
---

 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 54 ++-------------------------
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h |  2 -
 2 files changed, 4 insertions(+), 52 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
index a8d75fd7e9f4..477cb6985b4d 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -93,34 +93,10 @@ static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
 	return crtcs;
 }
 
-static int sun8i_dw_hdmi_find_connector_pdev(struct device *dev,
-					     struct platform_device **pdev_out)
-{
-	struct platform_device *pdev;
-	struct device_node *remote;
-
-	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
-	if (!remote)
-		return -ENODEV;
-
-	if (!of_device_is_compatible(remote, "hdmi-connector")) {
-		of_node_put(remote);
-		return -ENODEV;
-	}
-
-	pdev = of_find_device_by_node(remote);
-	of_node_put(remote);
-	if (!pdev)
-		return -ENODEV;
-
-	*pdev_out = pdev;
-	return 0;
-}
-
 static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 			      void *data)
 {
-	struct platform_device *pdev = to_platform_device(dev), *connector_pdev;
+	struct platform_device *pdev = to_platform_device(dev);
 	struct dw_hdmi_plat_data *plat_data;
 	struct drm_device *drm = data;
 	struct device_node *phy_node;
@@ -167,30 +143,16 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 		return dev_err_probe(dev, PTR_ERR(hdmi->regulator),
 				     "Couldn't get regulator\n");
 
-	ret = sun8i_dw_hdmi_find_connector_pdev(dev, &connector_pdev);
-	if (!ret) {
-		hdmi->ddc_en = gpiod_get_optional(&connector_pdev->dev,
-						  "ddc-en", GPIOD_OUT_HIGH);
-		platform_device_put(connector_pdev);
-
-		if (IS_ERR(hdmi->ddc_en)) {
-			dev_err(dev, "Couldn't get ddc-en gpio\n");
-			return PTR_ERR(hdmi->ddc_en);
-		}
-	}
-
 	ret = regulator_enable(hdmi->regulator);
 	if (ret) {
 		dev_err(dev, "Failed to enable regulator\n");
-		goto err_unref_ddc_en;
+		return ret;
 	}
 
-	gpiod_set_value(hdmi->ddc_en, 1);
-
 	ret = reset_control_deassert(hdmi->rst_ctrl);
 	if (ret) {
 		dev_err(dev, "Could not deassert ctrl reset control\n");
-		goto err_disable_ddc_en;
+		goto err_disable_regulator;
 	}
 
 	ret = clk_prepare_enable(hdmi->clk_tmds);
@@ -245,12 +207,8 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 	clk_disable_unprepare(hdmi->clk_tmds);
 err_assert_ctrl_reset:
 	reset_control_assert(hdmi->rst_ctrl);
-err_disable_ddc_en:
-	gpiod_set_value(hdmi->ddc_en, 0);
+err_disable_regulator:
 	regulator_disable(hdmi->regulator);
-err_unref_ddc_en:
-	if (hdmi->ddc_en)
-		gpiod_put(hdmi->ddc_en);
 
 	return ret;
 }
@@ -264,11 +222,7 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
 	sun8i_hdmi_phy_deinit(hdmi->phy);
 	clk_disable_unprepare(hdmi->clk_tmds);
 	reset_control_assert(hdmi->rst_ctrl);
-	gpiod_set_value(hdmi->ddc_en, 0);
 	regulator_disable(hdmi->regulator);
-
-	if (hdmi->ddc_en)
-		gpiod_put(hdmi->ddc_en);
 }
 
 static const struct component_ops sun8i_dw_hdmi_ops = {
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
index bffe1b9cd3dc..9ad09522947a 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
@@ -9,7 +9,6 @@
 #include <drm/bridge/dw_hdmi.h>
 #include <drm/drm_encoder.h>
 #include <linux/clk.h>
-#include <linux/gpio/consumer.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
@@ -193,7 +192,6 @@ struct sun8i_dw_hdmi {
 	struct regulator		*regulator;
 	const struct sun8i_dw_hdmi_quirks *quirks;
 	struct reset_control		*rst_ctrl;
-	struct gpio_desc		*ddc_en;
 };
 
 extern struct platform_driver sun8i_hdmi_phy_driver;
-- 
2.35.1