linux-kernel - [PATCH v2 8/8] [RFC] drm/ingenic: convert to component framework for jz4780 hdmi

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Date:   Thu,  5 Aug 2021 16:07:57 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Paul Cercueil <paul@...pouillou.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Harry Wentland <harry.wentland@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime@...no.tech>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
        Paul Boddie <paul@...die.org.uk>,
        Jonas Karlman <jonas@...boo.se>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 8/8] [RFC] drm/ingenic: convert to component framework for jz4780 hdmi

This patch attempts to convert the ingenic-dw-hdmi driver
into a version that uses the component framework.

Unfortunately the new version does not work.

Debugging shows that ingenic_dw_hdmi_bind() is never called.

Suggestions for reasons and fixes are welcome.

Signed-off-by: Paul Boddie <paul@...die.org.uk>
Co-authored-by: Paul Boddie <paul@...die.org.uk>
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c | 57 ++++++++++++++++++-----
 1 file changed, 46 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
index 61e7a57d7cec1..a5ba0b69baa8c 100644
--- a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
+++ b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
@@ -1,17 +1,24 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
- * Copyright (C) 2019, 2020 Paul Boddie <paul@...die.org.uk>
+ * Copyright (C) 2019, 2020, 2021 Paul Boddie <paul@...die.org.uk>
  *
  * Derived from dw_hdmi-imx.c with i.MX portions removed.
- * Probe and remove operations derived from rcar_dw_hdmi.c.
  */
 
+#include <linux/component.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 
 #include <drm/bridge/dw_hdmi.h>
 #include <drm/drm_of.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_simple_kms_helper.h>
+
+struct ingenic_dw_hdmi_encoder {
+	struct drm_encoder encoder;
+	struct dw_hdmi *hdmi;
+};
 
 static const struct dw_hdmi_mpll_config ingenic_mpll_cfg[] = {
 	{ 45250000,  { { 0x01e0, 0x0000 }, { 0x21e1, 0x0000 }, { 0x41e2, 0x0000 } } },
@@ -87,24 +94,52 @@ static const struct of_device_id ingenic_dw_hdmi_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, ingenic_dw_hdmi_dt_ids);
 
-static int ingenic_dw_hdmi_probe(struct platform_device *pdev)
+static int ingenic_dw_hdmi_bind(struct device *dev, struct device *master,
+				void *data)
 {
-	struct dw_hdmi *hdmi;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = data;
+	struct drm_encoder *enc;
+	struct ingenic_dw_hdmi_encoder *hdmi_encoder;
 
-	hdmi = dw_hdmi_probe(pdev, &ingenic_dw_hdmi_plat_data);
-	if (IS_ERR(hdmi))
-		return PTR_ERR(hdmi);
+	hdmi_encoder = drmm_simple_encoder_alloc(drm, struct ingenic_dw_hdmi_encoder,
+						 encoder, DRM_MODE_ENCODER_TMDS);
+	if (IS_ERR(hdmi_encoder))
+		return PTR_ERR(hdmi_encoder);
 
-	platform_set_drvdata(pdev, hdmi);
+	enc = &hdmi_encoder->encoder;
+	drm_encoder_helper_add(enc, NULL);
+	hdmi_encoder->hdmi = dw_hdmi_bind(pdev, enc, &ingenic_dw_hdmi_plat_data);
+
+	if (IS_ERR(hdmi_encoder->hdmi))
+		return PTR_ERR(hdmi_encoder->hdmi);
+
+	dev_set_drvdata(dev, hdmi_encoder->hdmi);
 
 	return 0;
 }
 
-static int ingenic_dw_hdmi_remove(struct platform_device *pdev)
+static void ingenic_dw_hdmi_unbind(struct device *dev, struct device *master,
+				   void *data)
+{
+	struct dw_hdmi *hdmi = dev_get_drvdata(dev);
+
+	dw_hdmi_unbind(hdmi);
+}
+
+static const struct component_ops ingenic_dw_hdmi_ops = {
+	.bind	= ingenic_dw_hdmi_bind,
+	.unbind	= ingenic_dw_hdmi_unbind,
+};
+
+static int ingenic_dw_hdmi_probe(struct platform_device *pdev)
 {
-	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
+	return component_add(&pdev->dev, &ingenic_dw_hdmi_ops);
+}
 
-	dw_hdmi_remove(hdmi);
+static int ingenic_dw_hdmi_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &ingenic_dw_hdmi_ops);
 
 	return 0;
 }
-- 
2.31.1