drm/vc4: Add KMS support for Raspberry Pi.

This is enough for fbcon and bringing up X using
xf86-video-modesetting.  It doesn't support the 3D accelerator or
power management yet.

v2: Drop FB_HELPER select thanks to Archit's patches.  Do manual init
    ordering instead of using the .load hook.  Structure registration
    more like tegra's, but still using the typical "component" code.
    Drop no-op hooks for atomic_begin and mode_fixup() now that
    they're optional.  Drop sentinel in Makefile.  Fix minor style
    nits I noticed on another reread.

v3: Use the new bcm2835 clk driver to manage pixel/HSM clocks instead
    of having a fixed video mode.  Use exynos-style component driver
    matching instead of devicetree nodes to list the component driver
    instances.  Rename compatibility strings to say bcm2835, and
    distinguish pv0/1/2.  Clean up some h/vsync code, and add in
    interlaced mode setup.  Fix up probe/bind error paths.  Use
    bitops.h macros for vc4_regs.h

v4: Include i2c.h, allow building under COMPILE_TEST, drop msleep now
    that other bugs have been fixed, add timeouts to cpu_relax()
    loops, rename hpd-gpio to hpd-gpios.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 590 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
new file mode 100644
index 000000000000..da9a36d6e1d1
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -0,0 +1,590 @@
+/*
+ * Copyright (C) 2015 Broadcom
+ * Copyright (c) 2014 The Linux Foundation. All rights reserved.
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * DOC: VC4 Falcon HDMI module
+ *
+ * The HDMI core has a state machine and a PHY.  Most of the unit
+ * operates off of the HSM clock from CPRMAN.  It also internally uses
+ * the PLLH_PIX clock for the PHY.
+ */
+
+#include "drm_atomic_helper.h"
+#include "drm_crtc_helper.h"
+#include "drm_edid.h"
+#include "linux/clk.h"
+#include "linux/component.h"
+#include "linux/i2c.h"
+#include "linux/of_gpio.h"
+#include "linux/of_platform.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+/* General HDMI hardware state. */
+struct vc4_hdmi {
+	struct platform_device *pdev;
+
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+
+	struct i2c_adapter *ddc;
+	void __iomem *hdmicore_regs;
+	void __iomem *hd_regs;
+	int hpd_gpio;
+
+	struct clk *pixel_clock;
+	struct clk *hsm_clock;
+};
+
+#define HDMI_READ(offset) readl(vc4->hdmi->hdmicore_regs + offset)
+#define HDMI_WRITE(offset, val) writel(val, vc4->hdmi->hdmicore_regs + offset)
+#define HD_READ(offset) readl(vc4->hdmi->hd_regs + offset)
+#define HD_WRITE(offset, val) writel(val, vc4->hdmi->hd_regs + offset)
+
+/* VC4 HDMI encoder KMS struct */
+struct vc4_hdmi_encoder {
+	struct vc4_encoder base;
+	bool hdmi_monitor;
+};
+
+static inline struct vc4_hdmi_encoder *
+to_vc4_hdmi_encoder(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct vc4_hdmi_encoder, base.base);
+}
+
+/* VC4 HDMI connector KMS struct */
+struct vc4_hdmi_connector {
+	struct drm_connector base;
+
+	/* Since the connector is attached to just the one encoder,
+	 * this is the reference to it so we can do the best_encoder()
+	 * hook.
+	 */
+	struct drm_encoder *encoder;
+};
+
+static inline struct vc4_hdmi_connector *
+to_vc4_hdmi_connector(struct drm_connector *connector)
+{
+	return container_of(connector, struct vc4_hdmi_connector, base);
+}
+
+#define HDMI_REG(reg) { reg, #reg }
+static const struct {
+	u32 reg;
+	const char *name;
+} hdmi_regs[] = {
+	HDMI_REG(VC4_HDMI_CORE_REV),
+	HDMI_REG(VC4_HDMI_SW_RESET_CONTROL),
+	HDMI_REG(VC4_HDMI_HOTPLUG_INT),
+	HDMI_REG(VC4_HDMI_HOTPLUG),
+	HDMI_REG(VC4_HDMI_HORZA),
+	HDMI_REG(VC4_HDMI_HORZB),
+	HDMI_REG(VC4_HDMI_FIFO_CTL),
+	HDMI_REG(VC4_HDMI_SCHEDULER_CONTROL),
+	HDMI_REG(VC4_HDMI_VERTA0),
+	HDMI_REG(VC4_HDMI_VERTA1),
+	HDMI_REG(VC4_HDMI_VERTB0),
+	HDMI_REG(VC4_HDMI_VERTB1),
+	HDMI_REG(VC4_HDMI_TX_PHY_RESET_CTL),
+};
+
+static const struct {
+	u32 reg;
+	const char *name;
+} hd_regs[] = {
+	HDMI_REG(VC4_HD_M_CTL),
+	HDMI_REG(VC4_HD_MAI_CTL),
+	HDMI_REG(VC4_HD_VID_CTL),
+	HDMI_REG(VC4_HD_CSC_CTL),
+	HDMI_REG(VC4_HD_FRAME_COUNT),
+};
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   hdmi_regs[i].name, hdmi_regs[i].reg,
+			   HDMI_READ(hdmi_regs[i].reg));
+	}
+
+	for (i = 0; i < ARRAY_SIZE(hd_regs); i++) {
+		seq_printf(m, "%s (0x%04x): 0x%08x\n",
+			   hd_regs[i].name, hd_regs[i].reg,
+			   HD_READ(hd_regs[i].reg));
+	}
+
+	return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static void vc4_hdmi_dump_regs(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) {
+		DRM_INFO("0x%04x (%s): 0x%08x\n",
+			 hdmi_regs[i].reg, hdmi_regs[i].name,
+			 HDMI_READ(hdmi_regs[i].reg));
+	}
+	for (i = 0; i < ARRAY_SIZE(hd_regs); i++) {
+		DRM_INFO("0x%04x (%s): 0x%08x\n",
+			 hd_regs[i].reg, hd_regs[i].name,
+			 HD_READ(hd_regs[i].reg));
+	}
+}
+
+static enum drm_connector_status
+vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct drm_device *dev = connector->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->hdmi->hpd_gpio) {
+		if (gpio_get_value(vc4->hdmi->hpd_gpio))
+			return connector_status_connected;
+		else
+			return connector_status_disconnected;
+	}
+
+	if (HDMI_READ(VC4_HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
+		return connector_status_connected;
+	else
+		return connector_status_disconnected;
+}
+
+static void vc4_hdmi_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
+{
+	struct vc4_hdmi_connector *vc4_connector =
+		to_vc4_hdmi_connector(connector);
+	struct drm_encoder *encoder = vc4_connector->encoder;
+	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
+	struct drm_device *dev = connector->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int ret = 0;
+	struct edid *edid;
+
+	edid = drm_get_edid(connector, vc4->hdmi->ddc);
+	if (!edid)
+		return -ENODEV;
+
+	vc4_encoder->hdmi_monitor = drm_detect_hdmi_monitor(edid);
+	drm_mode_connector_update_edid_property(connector, edid);
+	ret = drm_add_edid_modes(connector, edid);
+
+	return ret;
+}
+
+static struct drm_encoder *
+vc4_hdmi_connector_best_encoder(struct drm_connector *connector)
+{
+	struct vc4_hdmi_connector *hdmi_connector =
+		to_vc4_hdmi_connector(connector);
+	return hdmi_connector->encoder;
+}
+
+static const struct drm_connector_funcs vc4_hdmi_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.detect = vc4_hdmi_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = vc4_hdmi_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = {
+	.get_modes = vc4_hdmi_connector_get_modes,
+	.best_encoder = vc4_hdmi_connector_best_encoder,
+};
+
+static struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
+						     struct drm_encoder *encoder)
+{
+	struct drm_connector *connector = NULL;
+	struct vc4_hdmi_connector *hdmi_connector;
+	int ret = 0;
+
+	hdmi_connector = devm_kzalloc(dev->dev, sizeof(*hdmi_connector),
+				      GFP_KERNEL);
+	if (!hdmi_connector) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+	connector = &hdmi_connector->base;
+
+	hdmi_connector->encoder = encoder;
+
+	drm_connector_init(dev, connector, &vc4_hdmi_connector_funcs,
+			   DRM_MODE_CONNECTOR_HDMIA);
+	drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs);
+
+	connector->polled = (DRM_CONNECTOR_POLL_CONNECT |
+			     DRM_CONNECTOR_POLL_DISCONNECT);
+
+	connector->interlace_allowed = 0;
+	connector->doublescan_allowed = 0;
+
+	drm_mode_connector_attach_encoder(connector, encoder);
+
+	return connector;
+
+ fail:
+	if (connector)
+		vc4_hdmi_connector_destroy(connector);
+
+	return ERR_PTR(ret);
+}
+
+static void vc4_hdmi_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs vc4_hdmi_encoder_funcs = {
+	.destroy = vc4_hdmi_encoder_destroy,
+};
+
+static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
+				      struct drm_display_mode *unadjusted_mode,
+				      struct drm_display_mode *mode)
+{
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	bool debug_dump_regs = false;
+	bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
+	bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
+	u32 vactive = (mode->vdisplay >>
+		       ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0));
+	u32 verta = (VC4_SET_FIELD(mode->vsync_end - mode->vsync_start,
+				   VC4_HDMI_VERTA_VSP) |
+		     VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
+				   VC4_HDMI_VERTA_VFP) |
+		     VC4_SET_FIELD(vactive, VC4_HDMI_VERTA_VAL));
+	u32 vertb = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
+		     VC4_SET_FIELD(mode->vtotal - mode->vsync_end,
+				   VC4_HDMI_VERTB_VBP));
+
+	if (debug_dump_regs) {
+		DRM_INFO("HDMI regs before:\n");
+		vc4_hdmi_dump_regs(dev);
+	}
+
+	HD_WRITE(VC4_HD_VID_CTL, 0);
+
+	clk_set_rate(vc4->hdmi->pixel_clock, mode->clock * 1000);
+
+	HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+		   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
+		   VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT |
+		   VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS);
+
+	HDMI_WRITE(VC4_HDMI_HORZA,
+		   (vsync_pos ? VC4_HDMI_HORZA_VPOS : 0) |
+		   (hsync_pos ? VC4_HDMI_HORZA_HPOS : 0) |
+		   VC4_SET_FIELD(mode->hdisplay, VC4_HDMI_HORZA_HAP));
+
+	HDMI_WRITE(VC4_HDMI_HORZB,
+		   VC4_SET_FIELD(mode->htotal - mode->hsync_end,
+				 VC4_HDMI_HORZB_HBP) |
+		   VC4_SET_FIELD(mode->hsync_end - mode->hsync_start,
+				 VC4_HDMI_HORZB_HSP) |
+		   VC4_SET_FIELD(mode->hsync_start - mode->hdisplay,
+				 VC4_HDMI_HORZB_HFP));
+
+	HDMI_WRITE(VC4_HDMI_VERTA0, verta);
+	HDMI_WRITE(VC4_HDMI_VERTA1, verta);
+
+	HDMI_WRITE(VC4_HDMI_VERTB0, vertb);
+	HDMI_WRITE(VC4_HDMI_VERTB1, vertb);
+
+	HD_WRITE(VC4_HD_VID_CTL,
+		 (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
+		 (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
+
+	/* The RGB order applies even when CSC is disabled. */
+	HD_WRITE(VC4_HD_CSC_CTL, VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
+					       VC4_HD_CSC_CTL_ORDER));
+
+	HDMI_WRITE(VC4_HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
+
+	if (debug_dump_regs) {
+		DRM_INFO("HDMI regs after:\n");
+		vc4_hdmi_dump_regs(dev);
+	}
+}
+
+static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
+	HD_WRITE(VC4_HD_VID_CTL,
+		 HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
+}
+
+static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
+{
+	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
+	struct drm_device *dev = encoder->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	int ret;
+
+	HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0);
+
+	HD_WRITE(VC4_HD_VID_CTL,
+		 HD_READ(VC4_HD_VID_CTL) |
+		 VC4_HD_VID_CTL_ENABLE |
+		 VC4_HD_VID_CTL_UNDERFLOW_ENABLE |
+		 VC4_HD_VID_CTL_FRAME_COUNTER_RESET);
+
+	if (vc4_encoder->hdmi_monitor) {
+		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
+			   VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
+
+		ret = wait_for(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+			       VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE, 1);
+		WARN_ONCE(ret, "Timeout waiting for "
+			  "VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n");
+	} else {
+		HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG,
+			   HDMI_READ(VC4_HDMI_RAM_PACKET_CONFIG) &
+			   ~(VC4_HDMI_RAM_PACKET_ENABLE));
+		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+			   ~VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI);
+
+		ret = wait_for(!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+				 VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE), 1);
+		WARN_ONCE(ret, "Timeout waiting for "
+			  "!VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n");
+	}
+
+	if (vc4_encoder->hdmi_monitor) {
+		u32 drift;
+
+		WARN_ON(!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) &
+			  VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE));
+		HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
+			   HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
+			   VC4_HDMI_SCHEDULER_CONTROL_VERT_ALWAYS_KEEPOUT);
+
+		/* XXX: Set HDMI_RAM_PACKET_CONFIG (1 << 16) and set
+		 * up the infoframe.
+		 */
+
+		drift = HDMI_READ(VC4_HDMI_FIFO_CTL);
+		drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK;
+
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift | VC4_HDMI_FIFO_CTL_RECENTER);
+		udelay(1000);
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
+		HDMI_WRITE(VC4_HDMI_FIFO_CTL,
+			   drift | VC4_HDMI_FIFO_CTL_RECENTER);
+
+		ret = wait_for(HDMI_READ(VC4_HDMI_FIFO_CTL) &
+			       VC4_HDMI_FIFO_CTL_RECENTER_DONE, 1);
+		WARN_ONCE(ret, "Timeout waiting for "
+			  "VC4_HDMI_FIFO_CTL_RECENTER_DONE");
+	}
+}
+
+static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
+	.mode_set = vc4_hdmi_encoder_mode_set,
+	.disable = vc4_hdmi_encoder_disable,
+	.enable = vc4_hdmi_encoder_enable,
+};
+
+static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = drm->dev_private;
+	struct vc4_hdmi *hdmi;
+	struct vc4_hdmi_encoder *vc4_hdmi_encoder;
+	struct device_node *ddc_node;
+	u32 value;
+	int ret;
+
+	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
+	if (!hdmi)
+		return -ENOMEM;
+
+	vc4_hdmi_encoder = devm_kzalloc(dev, sizeof(*vc4_hdmi_encoder),
+					GFP_KERNEL);
+	if (!vc4_hdmi_encoder)
+		return -ENOMEM;
+	vc4_hdmi_encoder->base.type = VC4_ENCODER_TYPE_HDMI;
+	hdmi->encoder = &vc4_hdmi_encoder->base.base;
+
+	hdmi->pdev = pdev;
+	hdmi->hdmicore_regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(hdmi->hdmicore_regs))
+		return PTR_ERR(hdmi->hdmicore_regs);
+
+	hdmi->hd_regs = vc4_ioremap_regs(pdev, 1);
+	if (IS_ERR(hdmi->hd_regs))
+		return PTR_ERR(hdmi->hd_regs);
+
+	ddc_node = of_parse_phandle(dev->of_node, "ddc", 0);
+	if (!ddc_node) {
+		DRM_ERROR("Failed to find ddc node in device tree\n");
+		return -ENODEV;
+	}
+
+	hdmi->pixel_clock = devm_clk_get(dev, "pixel");
+	if (IS_ERR(hdmi->pixel_clock)) {
+		DRM_ERROR("Failed to get pixel clock\n");
+		return PTR_ERR(hdmi->pixel_clock);
+	}
+	hdmi->hsm_clock = devm_clk_get(dev, "hdmi");
+	if (IS_ERR(hdmi->hsm_clock)) {
+		DRM_ERROR("Failed to get HDMI state machine clock\n");
+		return PTR_ERR(hdmi->hsm_clock);
+	}
+
+	hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node);
+	if (!hdmi->ddc) {
+		DRM_DEBUG("Failed to get ddc i2c adapter by node\n");
+		return -EPROBE_DEFER;
+	}
+
+	/* Enable the clocks at startup.  We can't quite recover from
+	 * turning off the pixel clock during disable/enables yet, so
+	 * it's always running.
+	 */
+	ret = clk_prepare_enable(hdmi->pixel_clock);
+	if (ret) {
+		DRM_ERROR("Failed to turn on pixel clock: %d\n", ret);
+		goto err_put_i2c;
+	}
+
+	ret = clk_prepare_enable(hdmi->hsm_clock);
+	if (ret) {
+		DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n",
+			  ret);
+		goto err_unprepare_pix;
+	}
+
+	/* Only use the GPIO HPD pin if present in the DT, otherwise
+	 * we'll use the HDMI core's register.
+	 */
+	if (of_find_property(dev->of_node, "hpd-gpios", &value)) {
+		hdmi->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0);
+		if (hdmi->hpd_gpio < 0) {
+			ret = hdmi->hpd_gpio;
+			goto err_unprepare_hsm;
+		}
+	}
+
+	vc4->hdmi = hdmi;
+
+	/* HDMI core must be enabled. */
+	WARN_ON_ONCE((HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE) == 0);
+
+	drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs,
+			 DRM_MODE_ENCODER_TMDS);
+	drm_encoder_helper_add(hdmi->encoder, &vc4_hdmi_encoder_helper_funcs);
+
+	hdmi->connector = vc4_hdmi_connector_init(drm, hdmi->encoder);
+	if (IS_ERR(hdmi->connector)) {
+		ret = PTR_ERR(hdmi->connector);
+		goto err_destroy_encoder;
+	}
+
+	return 0;
+
+err_destroy_encoder:
+	vc4_hdmi_encoder_destroy(hdmi->encoder);
+err_unprepare_hsm:
+	clk_disable_unprepare(hdmi->hsm_clock);
+err_unprepare_pix:
+	clk_disable_unprepare(hdmi->pixel_clock);
+err_put_i2c:
+	put_device(&vc4->hdmi->ddc->dev);
+
+	return ret;
+}
+
+static void vc4_hdmi_unbind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = drm->dev_private;
+	struct vc4_hdmi *hdmi = vc4->hdmi;
+
+	vc4_hdmi_connector_destroy(hdmi->connector);
+	vc4_hdmi_encoder_destroy(hdmi->encoder);
+
+	clk_disable_unprepare(hdmi->pixel_clock);
+	clk_disable_unprepare(hdmi->hsm_clock);
+	put_device(&hdmi->ddc->dev);
+
+	vc4->hdmi = NULL;
+}
+
+static const struct component_ops vc4_hdmi_ops = {
+	.bind   = vc4_hdmi_bind,
+	.unbind = vc4_hdmi_unbind,
+};
+
+static int vc4_hdmi_dev_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &vc4_hdmi_ops);
+}
+
+static int vc4_hdmi_dev_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &vc4_hdmi_ops);
+	return 0;
+}
+
+static const struct of_device_id vc4_hdmi_dt_match[] = {
+	{ .compatible = "brcm,bcm2835-hdmi" },
+	{}
+};
+
+struct platform_driver vc4_hdmi_driver = {
+	.probe = vc4_hdmi_dev_probe,
+	.remove = vc4_hdmi_dev_remove,
+	.driver = {
+		.name = "vc4_hdmi",
+		.of_match_table = vc4_hdmi_dt_match,
+	},
+};