Message-Id: <20170920193831.20268-6-jernej.skrabec@siol.net>
Date:   Wed, 20 Sep 2017 21:38:29 +0200
From:   Jernej Skrabec <jernej.skrabec@...l.net>
To:     maxime.ripard@...e-electrons.com, wens@...e.org
Cc:     Laurent.pinchart@...asonboard.com, narmstrong@...libre.com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, icenowy@...c.io,
        linux-sunxi@...glegroups.com
Subject: [RFC PATCH 5/7] drm: sun4i: Add a glue for the DesignWare HDMI controller in H3

Allwinner H3 features DesignWare HDMI Transmitter paired with custom
PHY.

Add a glue driver for it.

For now, only video and CEC are supported. Audio will be supported at
a later time.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
---
 drivers/gpu/drm/sun4i/Kconfig         |   9 +
 drivers/gpu/drm/sun4i/Makefile        |   1 +
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 500 ++++++++++++++++++++++++++++++++++
 3 files changed, 510 insertions(+)
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c

diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
index 06f05302ee75..589502ffe31a 100644
--- a/drivers/gpu/drm/sun4i/Kconfig
+++ b/drivers/gpu/drm/sun4i/Kconfig
@@ -40,6 +40,15 @@ config DRM_SUN4I_BACKEND
 	  do some alpha blending and feed graphics to TCON. If M is
 	  selected the module will be called sun4i-backend.
 
+config DRM_SUN8I_DW_HDMI
+	tristate "Support for Allwinner version of DesignWare HDMI"
+	depends on DRM_SUN4I
+	select DRM_DW_HDMI
+	help
+	  Choose this option if you have an Allwinner SoC with the
+	  DesignWare HDMI controller with custom HDMI PHY. If M is
+	  selected the module will be called sun8i_dw_hdmi.
+
 config DRM_SUN8I_MIXER
 	tristate "Support for Allwinner Display Engine 2.0 Mixer"
 	default MACH_SUN8I
diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index 43c753cafc88..9c56173bf140 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
 obj-$(CONFIG_DRM_SUN4I_BACKEND)		+= sun4i-backend.o
 obj-$(CONFIG_DRM_SUN4I_HDMI)	+= sun4i-drm-hdmi.o
 obj-$(CONFIG_DRM_SUN8I_MIXER)		+= sun8i-mixer.o
+obj-$(CONFIG_DRM_SUN8I_DW_HDMI)	+= sun8i_dw_hdmi.o
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
new file mode 100644
index 000000000000..65db3e10e311
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -0,0 +1,500 @@
+/*
+ * Copyright (c) 2017, Jernej Skrabec <jernej.skrabec@...l.net>
+ *
+ * Based on hdmi_bsp_sun8iw7.c which is:
+ * Copyright (c) 2016 Allwinnertech Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include <drm/drm_of.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/bridge/dw_hdmi.h>
+
+#include "sun4i_crtc.h"
+#include "sun4i_tcon.h"
+
+#define SUN8I_HDMI_PHY_REG_POL		0x0000
+
+#define SUN8I_HDMI_PHY_REG_READ_EN	0x0010
+#define SUN8I_HDMI_PHY_REG_READ_EN_MAGIC	0x54524545
+
+#define SUN8I_HDMI_PHY_REG_UNSCRAMBLE	0x0014
+#define SUN8I_HDMI_PHY_REG_UNSCRAMBLE_MAGIC	0x42494E47
+
+#define SUN8I_HDMI_PHY_REG_CTRL		0x0020
+#define SUN8I_HDMI_PHY_REG_UNK1		0x0024
+#define SUN8I_HDMI_PHY_REG_UNK2		0x0028
+#define SUN8I_HDMI_PHY_REG_PLL		0x002c
+#define SUN8I_HDMI_PHY_REG_CLK		0x0030
+#define SUN8I_HDMI_PHY_REG_UNK3		0x0034
+
+#define SUN8I_HDMI_PHY_REG_STATUS	0x0038
+#define SUN8I_HDMI_PHY_REG_STATUS_READY		BIT(7)
+#define SUN8I_HDMI_PHY_REG_STATUS_HPD		BIT(19)
+
+#define SUN8I_HDMI_PHY_REG_CEC		0x003c
+
+#define to_sun8i_dw_hdmi(x)	container_of(x, struct sun8i_dw_hdmi, x)
+#define set_bits(p, v)		writel(readl(p) | (v), p)
+
+struct sun8i_dw_hdmi {
+	struct clk *clk_ahb;
+	struct clk *clk_ddc;
+	struct clk *clk_sfr;
+	struct device *dev;
+	struct drm_encoder encoder;
+	void __iomem *phy_base;
+	struct dw_hdmi_plat_data plat_data;
+	struct reset_control *rst_ddc;
+	struct reset_control *rst_hdmi;
+};
+
+static u32 sun8i_dw_hdmi_get_divider(int clk_khz)
+{
+	/*
+	 * Due to missing documentation of HDMI PHY, we know correct
+	 * settings only for following four PHY dividers. Select one
+	 * based on pixel clock.
+	 */
+	if (clk_khz <= 27000)
+		return 11;
+	else if (clk_khz <= 74250)
+		return 4;
+	else if (clk_khz <= 148500)
+		return 2;
+	else
+		return 1;
+}
+
+static void sun8i_dw_hdmi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
+	struct sun4i_tcon *tcon = crtc->tcon;
+
+	DRM_DEBUG_DRIVER("Disabling HDMI Output\n");
+
+	sun4i_tcon_channel_disable(tcon, 1);
+}
+
+static void sun8i_dw_hdmi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
+	struct sun4i_tcon *tcon = crtc->tcon;
+
+	DRM_DEBUG_DRIVER("Enabling HDMI Output\n");
+
+	sun4i_tcon_channel_enable(tcon, 1);
+}
+
+static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
+					   struct drm_display_mode *mode,
+					   struct drm_display_mode *adj_mode)
+{
+	struct sun8i_dw_hdmi *hdmi = to_sun8i_dw_hdmi(encoder);
+	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
+	struct sun4i_tcon *tcon = crtc->tcon;
+	u32 div;
+
+	sun4i_tcon1_mode_set(tcon, mode);
+
+	div = sun8i_dw_hdmi_get_divider(mode->crtc_clock);
+	clk_set_rate(hdmi->clk_sfr, mode->crtc_clock * 1000 * div);
+	clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
+}
+
+static const struct drm_encoder_helper_funcs
+				sun8i_dw_hdmi_encoder_helper_funcs = {
+	.mode_set = sun8i_dw_hdmi_encoder_mode_set,
+	.enable   = sun8i_dw_hdmi_encoder_enable,
+	.disable  = sun8i_dw_hdmi_encoder_disable,
+};
+
+static int sun8i_dw_hdmi_phy_init(struct dw_hdmi *hdmi_data, void *data,
+				  struct drm_display_mode *mode)
+{
+	struct sun8i_dw_hdmi *hdmi = (struct sun8i_dw_hdmi *)data;
+	u32 div = sun8i_dw_hdmi_get_divider(mode->crtc_clock);
+	u32 val;
+
+	/*
+	 * Unfortunately, we don't know much about those magic
+	 * numbers. They are taken from Allwinner BSP driver.
+	 */
+
+	val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+	writel(val & ~0xf000, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+
+	switch (div) {
+	case 1:
+		writel(0x30dc5fc0, hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL);
+		writel(0x800863C0, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CLK);
+		usleep_range(10000, 15000);
+		writel(1, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK3);
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, BIT(25));
+		msleep(200);
+		val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS);
+		val = (val & 0x1f800) >> 11;
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL,
+			 BIT(31) | BIT(30));
+		if (val < 0x3d)
+			set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL,
+				 val + 2);
+		else
+			set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, 0x3f);
+		msleep(100);
+		writel(0x01FFFF7F, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+		writel(0x8063b000, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK1);
+		writel(0x0F8246B5, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK2);
+		break;
+	case 2:
+		writel(0x39dc5040, hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL);
+		writel(0x80084381, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CLK);
+		usleep_range(10000, 15000);
+		writel(1, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK3);
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, BIT(25));
+		msleep(100);
+		val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS);
+		val = (val & 0x1f800) >> 11;
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL,
+			 BIT(31) | BIT(30));
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, val);
+		writel(0x01FFFF7F, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+		writel(0x8063a800, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK1);
+		writel(0x0F81C485, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK2);
+		break;
+	case 4:
+		writel(0x39dc5040, hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL);
+		writel(0x80084343, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CLK);
+		usleep_range(10000, 15000);
+		writel(1, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK3);
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, BIT(25));
+		msleep(100);
+		val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS);
+		val = (val & 0x1f800) >> 11;
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL,
+			 BIT(31) | BIT(30));
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, val);
+		writel(0x01FFFF7F, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+		writel(0x8063b000, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK1);
+		writel(0x0F81C405, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK2);
+		break;
+	case 11:
+		writel(0x39dc5040, hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL);
+		writel(0x8008430a, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CLK);
+		usleep_range(10000, 15000);
+		writel(1, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK3);
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, BIT(25));
+		msleep(100);
+		val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS);
+		val = (val & 0x1f800) >> 11;
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL,
+			 BIT(31) | BIT(30));
+		set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, val);
+		writel(0x01FFFF7F, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+		writel(0x8063b000, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK1);
+		writel(0x0F81C405, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK2);
+		break;
+	}
+
+	/* clear polarity bits */
+	val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_POL);
+	val &= ~0x300;
+
+	/*
+	 * Set polarity bits if necessary. Condition in original code
+	 * is a bit weird. This is attempt to make it more reasonable
+	 * and it works. It could be that bits and conditions are
+	 * related and should be separated.
+	 */
+	if (!(mode->flags & DRM_MODE_FLAG_PHSYNC) ||
+	    !(mode->flags & DRM_MODE_FLAG_PVSYNC)) {
+		val |= 0x300;
+	}
+
+	writel(val, hdmi->phy_base + SUN8I_HDMI_PHY_REG_POL);
+
+	return 0;
+}
+
+static void sun8i_dw_hdmi_phy_disable(struct dw_hdmi *hdmi_data, void *data)
+{
+	struct sun8i_dw_hdmi *hdmi = (struct sun8i_dw_hdmi *)data;
+
+	/* Disable output and stop PLL */
+	writel(7, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+	writel(0, hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL);
+}
+
+static enum drm_connector_status
+			sun8i_dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi_data,
+						   void *data)
+{
+	struct sun8i_dw_hdmi *hdmi = (struct sun8i_dw_hdmi *)data;
+	u32 reg_val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS);
+
+	return (reg_val & SUN8I_HDMI_PHY_REG_STATUS_HPD) ?
+		connector_status_connected : connector_status_disconnected;
+}
+
+static const struct dw_hdmi_phy_ops sun8i_dw_hdmi_phy_ops = {
+	.init = &sun8i_dw_hdmi_phy_init,
+	.disable = &sun8i_dw_hdmi_phy_disable,
+	.read_hpd = &sun8i_dw_hdmi_phy_read_hpd,
+};
+
+static void sun8i_dw_hdmi_init(struct sun8i_dw_hdmi *hdmi)
+{
+	u32 timeout = 20;
+	u32 val;
+
+	/*
+	 * HDMI PHY settings are taken as-is from Allwinner BSP code.
+	 * There is no documentation.
+	 */
+	writel(0, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(0));
+	udelay(5);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(16));
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(1));
+	usleep_range(10, 20);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(2));
+	udelay(5);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(3));
+	usleep_range(40, 100);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(19));
+	usleep_range(100, 200);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(18));
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, 7 << 4);
+
+	/* Note that Allwinner code doesn't fail in case of timeout */
+	while (!(readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS) &
+		SUN8I_HDMI_PHY_REG_STATUS_READY)) {
+		if (!timeout--) {
+			dev_warn(hdmi->dev, "HDMI PHY init timeout!\n");
+			break;
+		}
+		usleep_range(100, 200);
+	}
+
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, 0xf << 8);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL, BIT(7));
+
+	writel(0x39dc5040, hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL);
+	writel(0x80084343, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CLK);
+	usleep_range(10000, 15000);
+	writel(1, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK3);
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, BIT(25));
+	msleep(100);
+	val = readl(hdmi->phy_base + SUN8I_HDMI_PHY_REG_STATUS);
+	val = (val & 0x1f800) >> 11;
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, BIT(31) | BIT(30));
+	set_bits(hdmi->phy_base + SUN8I_HDMI_PHY_REG_PLL, val);
+	writel(0x01FF0F7F, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CTRL);
+	writel(0x80639000, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK1);
+	writel(0x0F81C405, hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNK2);
+
+	/* enable read access to HDMI controller */
+	writel(SUN8I_HDMI_PHY_REG_READ_EN_MAGIC,
+	       hdmi->phy_base + SUN8I_HDMI_PHY_REG_READ_EN);
+
+	/* unscramble register offsets */
+	writel(SUN8I_HDMI_PHY_REG_UNSCRAMBLE_MAGIC,
+	       hdmi->phy_base + SUN8I_HDMI_PHY_REG_UNSCRAMBLE);
+
+	/* Reset PHY CEC settings. This gives dw hdmi total control over CEC. */
+	writel(0, hdmi->phy_base + SUN8I_HDMI_PHY_REG_CEC);
+}
+
+static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
+			      void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct dw_hdmi_plat_data *plat_data;
+	struct drm_device *drm = data;
+	struct drm_encoder *encoder;
+	struct sun8i_dw_hdmi *hdmi;
+	struct resource *res;
+	int ret;
+
+	if (!pdev->dev.of_node)
+		return -ENODEV;
+
+	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
+	if (!hdmi)
+		return -ENOMEM;
+
+	plat_data = &hdmi->plat_data;
+	hdmi->dev = &pdev->dev;
+	encoder = &hdmi->encoder;
+
+	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
+	/*
+	 * If we failed to find the CRTC(s) which this encoder is
+	 * supposed to be connected to, it's because the CRTC has
+	 * not been registered yet.  Defer probing, and hope that
+	 * the required CRTC is added later.
+	 */
+	if (encoder->possible_crtcs == 0)
+		return -EPROBE_DEFER;
+
+	/* resource 0 is the memory region for the core controller */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	hdmi->phy_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(hdmi->phy_base))
+		return PTR_ERR(hdmi->phy_base);
+
+	hdmi->clk_ahb = devm_clk_get(dev, "iahb");
+	if (IS_ERR(hdmi->clk_ahb)) {
+		dev_err(dev, "Could not get iahb clock\n");
+		return PTR_ERR(hdmi->clk_ahb);
+	}
+
+	hdmi->clk_sfr = devm_clk_get(dev, "isfr");
+	if (IS_ERR(hdmi->clk_sfr)) {
+		dev_err(dev, "Could not get isfr clock\n");
+		return PTR_ERR(hdmi->clk_sfr);
+	}
+
+	hdmi->clk_ddc = devm_clk_get(dev, "ddc");
+	if (IS_ERR(hdmi->clk_ddc)) {
+		dev_err(dev, "Could not get ddc clock\n");
+		return PTR_ERR(hdmi->clk_ddc);
+	}
+
+	hdmi->rst_hdmi = devm_reset_control_get(dev, "hdmi");
+	if (IS_ERR(hdmi->rst_hdmi)) {
+		dev_err(dev, "Could not get hdmi reset control\n");
+		return PTR_ERR(hdmi->rst_hdmi);
+	}
+
+	hdmi->rst_ddc = devm_reset_control_get(dev, "ddc");
+	if (IS_ERR(hdmi->rst_ddc)) {
+		dev_err(dev, "Could not get ddc reset control\n");
+		return PTR_ERR(hdmi->rst_ddc);
+	}
+
+	ret = clk_prepare_enable(hdmi->clk_ahb);
+	if (ret) {
+		dev_err(dev, "Cannot enable ahb clock: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(hdmi->clk_sfr);
+	if (ret) {
+		dev_err(dev, "Cannot enable isfr clock: %d\n", ret);
+		goto err_ahb_clk;
+	}
+
+	ret = clk_prepare_enable(hdmi->clk_ddc);
+	if (ret) {
+		dev_err(dev, "Cannot enable ddc clock: %d\n", ret);
+		goto err_sfr_clk;
+	}
+
+	ret = reset_control_deassert(hdmi->rst_hdmi);
+	if (ret) {
+		dev_err(dev, "Could not deassert hdmi reset control\n");
+		goto err_ddc_clk;
+	}
+
+	ret = reset_control_deassert(hdmi->rst_ddc);
+	if (ret) {
+		dev_err(dev, "Could not deassert ddc reset control\n");
+		goto err_assert_hdmi_reset;
+	}
+
+	drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
+	drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
+			 DRM_MODE_ENCODER_TMDS, NULL);
+
+	sun8i_dw_hdmi_init(hdmi);
+
+	plat_data->phy_ops = &sun8i_dw_hdmi_phy_ops,
+	plat_data->phy_name = "sun8i_dw_hdmi_phy",
+	plat_data->phy_data = hdmi;
+
+	ret = dw_hdmi_bind(pdev, encoder, plat_data);
+
+	/*
+	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
+	 * which would have called the encoder cleanup.  Do it manually.
+	 */
+	if (ret)
+		goto cleanup_encoder;
+
+	return 0;
+
+cleanup_encoder:
+	drm_encoder_cleanup(encoder);
+	reset_control_assert(hdmi->rst_ddc);
+err_assert_hdmi_reset:
+	reset_control_assert(hdmi->rst_hdmi);
+err_ddc_clk:
+	clk_disable_unprepare(hdmi->clk_ddc);
+err_sfr_clk:
+	clk_disable_unprepare(hdmi->clk_sfr);
+err_ahb_clk:
+	clk_disable_unprepare(hdmi->clk_ahb);
+
+	return ret;
+}
+
+static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
+				 void *data)
+{
+	return dw_hdmi_unbind(dev);
+}
+
+static const struct component_ops sun8i_dw_hdmi_ops = {
+	.bind	= sun8i_dw_hdmi_bind,
+	.unbind	= sun8i_dw_hdmi_unbind,
+};
+
+static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
+}
+
+static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
+
+	return 0;
+}
+
+static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
+	{ .compatible = "allwinner,sun8i-h3-dw-hdmi" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
+
+struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
+	.probe  = sun8i_dw_hdmi_probe,
+	.remove = sun8i_dw_hdmi_remove,
+	.driver = {
+		.name = "sun8i-dw-hdmi",
+		.of_match_table = sun8i_dw_hdmi_dt_ids,
+	},
+};
+module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
+
+MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@...l.net>");
+MODULE_DESCRIPTION("Allwinner H3 DW HDMI bridge");
+MODULE_LICENSE("GPL");
-- 
2.14.1

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