[deliverable/linux.git] / drivers / gpu / drm / vc4 / vc4_dpi.c

/*
 * Copyright (C) 2016 Broadcom Limited
 *
 * 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 DPI module
 *
 * The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI
 * signals, which are routed out to GPIO0-27 with the ALT2 function.
 */

#include "drm_atomic_helper.h"
#include "drm_crtc_helper.h"
#include "drm_edid.h"
#include "drm_panel.h"
#include "linux/clk.h"
#include "linux/component.h"
#include "linux/of_graph.h"
#include "linux/of_platform.h"
#include "vc4_drv.h"
#include "vc4_regs.h"

#define DPI_C			0x00
# define DPI_OUTPUT_ENABLE_MODE		BIT(16)

/* The order field takes the incoming 24 bit RGB from the pixel valve
 * and shuffles the 3 channels.
 */
# define DPI_ORDER_MASK			VC4_MASK(15, 14)
# define DPI_ORDER_SHIFT		14
# define DPI_ORDER_RGB			0
# define DPI_ORDER_BGR			1
# define DPI_ORDER_GRB			2
# define DPI_ORDER_BRG			3

/* The format field takes the ORDER-shuffled pixel valve data and
 * formats it onto the output lines.
 */
# define DPI_FORMAT_MASK		VC4_MASK(13, 11)
# define DPI_FORMAT_SHIFT		11
/* This define is named in the hardware, but actually just outputs 0. */
# define DPI_FORMAT_9BIT_666_RGB	0
/* Outputs 00000000rrrrrggggggbbbbb */
# define DPI_FORMAT_16BIT_565_RGB_1	1
/* Outputs 000rrrrr00gggggg000bbbbb */
# define DPI_FORMAT_16BIT_565_RGB_2	2
/* Outputs 00rrrrr000gggggg00bbbbb0 */
# define DPI_FORMAT_16BIT_565_RGB_3	3
/* Outputs 000000rrrrrrggggggbbbbbb */
# define DPI_FORMAT_18BIT_666_RGB_1	4
/* Outputs 00rrrrrr00gggggg00bbbbbb */
# define DPI_FORMAT_18BIT_666_RGB_2	5
/* Outputs rrrrrrrrggggggggbbbbbbbb */
# define DPI_FORMAT_24BIT_888_RGB	6

/* Reverses the polarity of the corresponding signal */
# define DPI_PIXEL_CLK_INVERT		BIT(10)
# define DPI_HSYNC_INVERT		BIT(9)
# define DPI_VSYNC_INVERT		BIT(8)
# define DPI_OUTPUT_ENABLE_INVERT	BIT(7)

/* Outputs the signal the falling clock edge instead of rising. */
# define DPI_HSYNC_NEGATE		BIT(6)
# define DPI_VSYNC_NEGATE		BIT(5)
# define DPI_OUTPUT_ENABLE_NEGATE	BIT(4)

/* Disables the signal */
# define DPI_HSYNC_DISABLE		BIT(3)
# define DPI_VSYNC_DISABLE		BIT(2)
# define DPI_OUTPUT_ENABLE_DISABLE	BIT(1)

/* Power gate to the device, full reset at 0 -> 1 transition */
# define DPI_ENABLE			BIT(0)

/* All other registers besides DPI_C return the ID */
#define DPI_ID			0x04
# define DPI_ID_VALUE		0x00647069

/* General DPI hardware state. */
struct vc4_dpi {
	struct platform_device *pdev;

	struct drm_encoder *encoder;
	struct drm_connector *connector;
	struct drm_panel *panel;

	void __iomem *regs;

	struct clk *pixel_clock;
	struct clk *core_clock;
};

#define DPI_READ(offset) readl(dpi->regs + (offset))
#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))

/* VC4 DPI encoder KMS struct */
struct vc4_dpi_encoder {
	struct vc4_encoder base;
	struct vc4_dpi *dpi;
};

static inline struct vc4_dpi_encoder *
to_vc4_dpi_encoder(struct drm_encoder *encoder)
{
	return container_of(encoder, struct vc4_dpi_encoder, base.base);
}

/* VC4 DPI connector KMS struct */
struct vc4_dpi_connector {
	struct drm_connector base;
	struct vc4_dpi *dpi;

	/* 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_dpi_connector *
to_vc4_dpi_connector(struct drm_connector *connector)
{
	return container_of(connector, struct vc4_dpi_connector, base);
}

#define DPI_REG(reg) { reg, #reg }
static const struct {
	u32 reg;
	const char *name;
} dpi_regs[] = {
	DPI_REG(DPI_C),
	DPI_REG(DPI_ID),
};

static void vc4_dpi_dump_regs(struct vc4_dpi *dpi)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
		DRM_INFO("0x%04x (%s): 0x%08x\n",
			 dpi_regs[i].reg, dpi_regs[i].name,
			 DPI_READ(dpi_regs[i].reg));
	}
}

#ifdef CONFIG_DEBUG_FS
int vc4_dpi_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);
	struct vc4_dpi *dpi = vc4->dpi;
	int i;

	if (!dpi)
		return 0;

	for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
		seq_printf(m, "%s (0x%04x): 0x%08x\n",
			   dpi_regs[i].name, dpi_regs[i].reg,
			   DPI_READ(dpi_regs[i].reg));
	}

	return 0;
}
#endif

static enum drm_connector_status
vc4_dpi_connector_detect(struct drm_connector *connector, bool force)
{
	struct vc4_dpi_connector *vc4_connector =
		to_vc4_dpi_connector(connector);
	struct vc4_dpi *dpi = vc4_connector->dpi;

	if (dpi->panel)
		return connector_status_connected;
	else
		return connector_status_disconnected;
}

static void vc4_dpi_connector_destroy(struct drm_connector *connector)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static int vc4_dpi_connector_get_modes(struct drm_connector *connector)
{
	struct vc4_dpi_connector *vc4_connector =
		to_vc4_dpi_connector(connector);
	struct vc4_dpi *dpi = vc4_connector->dpi;

	if (dpi->panel)
		return drm_panel_get_modes(dpi->panel);

	return 0;
}

static struct drm_encoder *
vc4_dpi_connector_best_encoder(struct drm_connector *connector)
{
	struct vc4_dpi_connector *dpi_connector =
		to_vc4_dpi_connector(connector);
	return dpi_connector->encoder;
}

static const struct drm_connector_funcs vc4_dpi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.detect = vc4_dpi_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = vc4_dpi_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_dpi_connector_helper_funcs = {
	.get_modes = vc4_dpi_connector_get_modes,
	.best_encoder = vc4_dpi_connector_best_encoder,
};

static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev,
						    struct vc4_dpi *dpi)
{
	struct drm_connector *connector = NULL;
	struct vc4_dpi_connector *dpi_connector;
	int ret = 0;

	dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector),
				     GFP_KERNEL);
	if (!dpi_connector) {
		ret = -ENOMEM;
		goto fail;
	}
	connector = &dpi_connector->base;

	dpi_connector->encoder = dpi->encoder;
	dpi_connector->dpi = dpi;

	drm_connector_init(dev, connector, &vc4_dpi_connector_funcs,
			   DRM_MODE_CONNECTOR_DPI);
	drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs);

	connector->polled = 0;
	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	drm_mode_connector_attach_encoder(connector, dpi->encoder);

	return connector;

 fail:
	if (connector)
		vc4_dpi_connector_destroy(connector);

	return ERR_PTR(ret);
}

static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
{
	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
	struct vc4_dpi *dpi = vc4_encoder->dpi;

	drm_panel_disable(dpi->panel);

	clk_disable_unprepare(dpi->pixel_clock);

	drm_panel_unprepare(dpi->panel);
}

static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
{
	struct drm_display_mode *mode = &encoder->crtc->mode;
	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
	struct vc4_dpi *dpi = vc4_encoder->dpi;
	u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
	int ret;

	ret = drm_panel_prepare(dpi->panel);
	if (ret) {
		DRM_ERROR("Panel failed to prepare\n");
		return;
	}

	if (dpi->connector->display_info.num_bus_formats) {
		u32 bus_format = dpi->connector->display_info.bus_formats[0];

		switch (bus_format) {
		case MEDIA_BUS_FMT_RGB888_1X24:
			dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
					       DPI_FORMAT);
			break;
		case MEDIA_BUS_FMT_BGR888_1X24:
			dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
					       DPI_FORMAT);
			dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER);
			break;
		case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
			dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2,
					       DPI_FORMAT);
			break;
		case MEDIA_BUS_FMT_RGB666_1X18:
			dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1,
					       DPI_FORMAT);
			break;
		case MEDIA_BUS_FMT_RGB565_1X16:
			dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3,
					       DPI_FORMAT);
			break;
		default:
			DRM_ERROR("Unknown media bus format %d\n", bus_format);
			break;
		}
	}

	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
		dpi_c |= DPI_HSYNC_INVERT;
	else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
		dpi_c |= DPI_HSYNC_DISABLE;

	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
		dpi_c |= DPI_VSYNC_INVERT;
	else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
		dpi_c |= DPI_VSYNC_DISABLE;

	DPI_WRITE(DPI_C, dpi_c);

	ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000);
	if (ret)
		DRM_ERROR("Failed to set clock rate: %d\n", ret);

	ret = clk_prepare_enable(dpi->pixel_clock);
	if (ret)
		DRM_ERROR("Failed to set clock rate: %d\n", ret);

	ret = drm_panel_enable(dpi->panel);
	if (ret) {
		DRM_ERROR("Panel failed to enable\n");
		drm_panel_unprepare(dpi->panel);
		return;
	}
}

static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
	.disable = vc4_dpi_encoder_disable,
	.enable = vc4_dpi_encoder_enable,
};

static const struct of_device_id vc4_dpi_dt_match[] = {
	{ .compatible = "brcm,bcm2835-dpi", .data = NULL },
	{}
};

/* Walks the OF graph to find the panel node and then asks DRM to look
 * up the panel.
 */
static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
{
	struct device_node *endpoint, *panel_node;
	struct device_node *np = dev->of_node;
	struct drm_panel *panel;

	endpoint = of_graph_get_next_endpoint(np, NULL);
	if (!endpoint) {
		dev_err(dev, "no endpoint to fetch DPI panel\n");
		return NULL;
	}

	/* don't proceed if we have an endpoint but no panel_node tied to it */
	panel_node = of_graph_get_remote_port_parent(endpoint);
	of_node_put(endpoint);
	if (!panel_node) {
		dev_err(dev, "no valid panel node\n");
		return NULL;
	}

	panel = of_drm_find_panel(panel_node);
	of_node_put(panel_node);

	return panel;
}

static int vc4_dpi_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 = to_vc4_dev(drm);
	struct vc4_dpi *dpi;
	struct vc4_dpi_encoder *vc4_dpi_encoder;
	int ret;

	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
	if (!dpi)
		return -ENOMEM;

	vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder),
				       GFP_KERNEL);
	if (!vc4_dpi_encoder)
		return -ENOMEM;
	vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI;
	vc4_dpi_encoder->dpi = dpi;
	dpi->encoder = &vc4_dpi_encoder->base.base;

	dpi->pdev = pdev;
	dpi->regs = vc4_ioremap_regs(pdev, 0);
	if (IS_ERR(dpi->regs))
		return PTR_ERR(dpi->regs);

	vc4_dpi_dump_regs(dpi);

	if (DPI_READ(DPI_ID) != DPI_ID_VALUE) {
		dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n",
			DPI_READ(DPI_ID), DPI_ID_VALUE);
		return -ENODEV;
	}

	dpi->core_clock = devm_clk_get(dev, "core");
	if (IS_ERR(dpi->core_clock)) {
		ret = PTR_ERR(dpi->core_clock);
		if (ret != -EPROBE_DEFER)
			DRM_ERROR("Failed to get core clock: %d\n", ret);
		return ret;
	}
	dpi->pixel_clock = devm_clk_get(dev, "pixel");
	if (IS_ERR(dpi->pixel_clock)) {
		ret = PTR_ERR(dpi->pixel_clock);
		if (ret != -EPROBE_DEFER)
			DRM_ERROR("Failed to get pixel clock: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(dpi->core_clock);
	if (ret)
		DRM_ERROR("Failed to turn on core clock: %d\n", ret);

	dpi->panel = vc4_dpi_get_panel(dev);

	drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs,
			 DRM_MODE_ENCODER_DPI, NULL);
	drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);

	dpi->connector = vc4_dpi_connector_init(drm, dpi);
	if (IS_ERR(dpi->connector)) {
		ret = PTR_ERR(dpi->connector);
		goto err_destroy_encoder;
	}

	if (dpi->panel)
		drm_panel_attach(dpi->panel, dpi->connector);

	dev_set_drvdata(dev, dpi);

	vc4->dpi = dpi;

	return 0;

err_destroy_encoder:
	drm_encoder_cleanup(dpi->encoder);
	clk_disable_unprepare(dpi->core_clock);
	return ret;
}

static void vc4_dpi_unbind(struct device *dev, struct device *master,
			   void *data)
{
	struct drm_device *drm = dev_get_drvdata(master);
	struct vc4_dev *vc4 = to_vc4_dev(drm);
	struct vc4_dpi *dpi = dev_get_drvdata(dev);

	if (dpi->panel)
		drm_panel_detach(dpi->panel);

	vc4_dpi_connector_destroy(dpi->connector);
	drm_encoder_cleanup(dpi->encoder);

	clk_disable_unprepare(dpi->core_clock);

	vc4->dpi = NULL;
}

static const struct component_ops vc4_dpi_ops = {
	.bind   = vc4_dpi_bind,
	.unbind = vc4_dpi_unbind,
};

static int vc4_dpi_dev_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &vc4_dpi_ops);
}

static int vc4_dpi_dev_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &vc4_dpi_ops);
	return 0;
}

struct platform_driver vc4_dpi_driver = {
	.probe = vc4_dpi_dev_probe,
	.remove = vc4_dpi_dev_remove,
	.driver = {
		.name = "vc4_dpi",
		.of_match_table = vc4_dpi_dt_match,
	},
};
Commit	Line	Data
08302c35 EA	1	/*
	2	* Copyright (C) 2016 Broadcom Limited
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program. If not, see <http://www.gnu.org/licenses/>.
	15	*/
	16
	17	/**
	18	* DOC: VC4 DPI module
	19	*
	20	* The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI
	21	* signals, which are routed out to GPIO0-27 with the ALT2 function.
	22	*/
	23
	24	#include "drm_atomic_helper.h"
	25	#include "drm_crtc_helper.h"
	26	#include "drm_edid.h"
	27	#include "drm_panel.h"
	28	#include "linux/clk.h"
	29	#include "linux/component.h"
	30	#include "linux/of_graph.h"
	31	#include "linux/of_platform.h"
	32	#include "vc4_drv.h"
	33	#include "vc4_regs.h"
	34
	35	#define DPI_C 0x00
	36	# define DPI_OUTPUT_ENABLE_MODE BIT(16)
	37
	38	/* The order field takes the incoming 24 bit RGB from the pixel valve
	39	* and shuffles the 3 channels.
	40	*/
	41	# define DPI_ORDER_MASK VC4_MASK(15, 14)
	42	# define DPI_ORDER_SHIFT 14
	43	# define DPI_ORDER_RGB 0
	44	# define DPI_ORDER_BGR 1
	45	# define DPI_ORDER_GRB 2
	46	# define DPI_ORDER_BRG 3
	47
	48	/* The format field takes the ORDER-shuffled pixel valve data and
	49	* formats it onto the output lines.
	50	*/
	51	# define DPI_FORMAT_MASK VC4_MASK(13, 11)
	52	# define DPI_FORMAT_SHIFT 11
	53	/* This define is named in the hardware, but actually just outputs 0. */
	54	# define DPI_FORMAT_9BIT_666_RGB 0
	55	/* Outputs 00000000rrrrrggggggbbbbb */
	56	# define DPI_FORMAT_16BIT_565_RGB_1 1
	57	/* Outputs 000rrrrr00gggggg000bbbbb */
	58	# define DPI_FORMAT_16BIT_565_RGB_2 2
	59	/* Outputs 00rrrrr000gggggg00bbbbb0 */
	60	# define DPI_FORMAT_16BIT_565_RGB_3 3
	61	/* Outputs 000000rrrrrrggggggbbbbbb */
	62	# define DPI_FORMAT_18BIT_666_RGB_1 4
	63	/* Outputs 00rrrrrr00gggggg00bbbbbb */
	64	# define DPI_FORMAT_18BIT_666_RGB_2 5
65	/* Outputs rrrrrrrrggggggggbbbbbbbb */
66	# define DPI_FORMAT_24BIT_888_RGB 6
67
68	/* Reverses the polarity of the corresponding signal */
69	# define DPI_PIXEL_CLK_INVERT BIT(10)
70	# define DPI_HSYNC_INVERT BIT(9)
71	# define DPI_VSYNC_INVERT BIT(8)
72	# define DPI_OUTPUT_ENABLE_INVERT BIT(7)
73
74	/* Outputs the signal the falling clock edge instead of rising. */
75	# define DPI_HSYNC_NEGATE BIT(6)
76	# define DPI_VSYNC_NEGATE BIT(5)
77	# define DPI_OUTPUT_ENABLE_NEGATE BIT(4)
78
79	/* Disables the signal */
80	# define DPI_HSYNC_DISABLE BIT(3)
81	# define DPI_VSYNC_DISABLE BIT(2)
82	# define DPI_OUTPUT_ENABLE_DISABLE BIT(1)
83
84	/* Power gate to the device, full reset at 0 -> 1 transition */
85	# define DPI_ENABLE BIT(0)
86
87	/* All other registers besides DPI_C return the ID */
88	#define DPI_ID 0x04
89	# define DPI_ID_VALUE 0x00647069
90
91	/* General DPI hardware state. */
92	struct vc4_dpi {
93	struct platform_device *pdev;
94
95	struct drm_encoder *encoder;
96	struct drm_connector *connector;
97	struct drm_panel *panel;
98
99	void __iomem *regs;
100
101	struct clk *pixel_clock;
102	struct clk *core_clock;
103	};
104
105	#define DPI_READ(offset) readl(dpi->regs + (offset))
106	#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))
107
108	/* VC4 DPI encoder KMS struct */
109	struct vc4_dpi_encoder {
110	struct vc4_encoder base;
111	struct vc4_dpi *dpi;
112	};
113
114	static inline struct vc4_dpi_encoder *
115	to_vc4_dpi_encoder(struct drm_encoder *encoder)
116	{
117	return container_of(encoder, struct vc4_dpi_encoder, base.base);
118	}
119
120	/* VC4 DPI connector KMS struct */
121	struct vc4_dpi_connector {
122	struct drm_connector base;
123	struct vc4_dpi *dpi;
124
125	/* Since the connector is attached to just the one encoder,
126	* this is the reference to it so we can do the best_encoder()
127	* hook.
128	*/
129	struct drm_encoder *encoder;
130	};
131
132	static inline struct vc4_dpi_connector *
133	to_vc4_dpi_connector(struct drm_connector *connector)
134	{
135	return container_of(connector, struct vc4_dpi_connector, base);
136	}
137
138	#define DPI_REG(reg) { reg, #reg }
139	static const struct {
140	u32 reg;
141	const char *name;
142	} dpi_regs[] = {
143	DPI_REG(DPI_C),
144	DPI_REG(DPI_ID),
145	};
146
147	static void vc4_dpi_dump_regs(struct vc4_dpi *dpi)
148	{
149	int i;
150
151	for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
152	DRM_INFO("0x%04x (%s): 0x%08x\n",
153	dpi_regs[i].reg, dpi_regs[i].name,
154	DPI_READ(dpi_regs[i].reg));
155	}
156	}
157
158	#ifdef CONFIG_DEBUG_FS
159	int vc4_dpi_debugfs_regs(struct seq_file m, void unused)
160	{
161	struct drm_info_node node = (struct drm_info_node )m->private;
162	struct drm_device *dev = node->minor->dev;
163	struct vc4_dev *vc4 = to_vc4_dev(dev);
164	struct vc4_dpi *dpi = vc4->dpi;
165	int i;
166
167	if (!dpi)
168	return 0;
169
170	for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
171	seq_printf(m, "%s (0x%04x): 0x%08x\n",
172	dpi_regs[i].name, dpi_regs[i].reg,
173	DPI_READ(dpi_regs[i].reg));
174	}
175
176	return 0;
177	}
178	#endif
179
180	static enum drm_connector_status
181	vc4_dpi_connector_detect(struct drm_connector *connector, bool force)
182	{
183	struct vc4_dpi_connector *vc4_connector =
184	to_vc4_dpi_connector(connector);
185	struct vc4_dpi *dpi = vc4_connector->dpi;
186
187	if (dpi->panel)
188	return connector_status_connected;
189	else
190	return connector_status_disconnected;
191	}
192
193	static void vc4_dpi_connector_destroy(struct drm_connector *connector)
194	{
195	drm_connector_unregister(connector);
196	drm_connector_cleanup(connector);
197	}
198
199	static int vc4_dpi_connector_get_modes(struct drm_connector *connector)
200	{
201	struct vc4_dpi_connector *vc4_connector =
202	to_vc4_dpi_connector(connector);
203	struct vc4_dpi *dpi = vc4_connector->dpi;
204
205	if (dpi->panel)
206	return drm_panel_get_modes(dpi->panel);
207
208	return 0;
209	}
210
211	static struct drm_encoder *
212	vc4_dpi_connector_best_encoder(struct drm_connector *connector)
213	{
214	struct vc4_dpi_connector *dpi_connector =
215	to_vc4_dpi_connector(connector);
216	return dpi_connector->encoder;
217	}
218
219	static const struct drm_connector_funcs vc4_dpi_connector_funcs = {
220	.dpms = drm_atomic_helper_connector_dpms,
221	.detect = vc4_dpi_connector_detect,
222	.fill_modes = drm_helper_probe_single_connector_modes,
223	.destroy = vc4_dpi_connector_destroy,
224	.reset = drm_atomic_helper_connector_reset,
225	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
226	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
227	};
228
229	static const struct drm_connector_helper_funcs vc4_dpi_connector_helper_funcs = {
230	.get_modes = vc4_dpi_connector_get_modes,
231	.best_encoder = vc4_dpi_connector_best_encoder,
232	};
233
234	static struct drm_connector vc4_dpi_connector_init(struct drm_device dev,
235	struct vc4_dpi *dpi)
236	{
237	struct drm_connector *connector = NULL;
238	struct vc4_dpi_connector *dpi_connector;
239	int ret = 0;
240
241	dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector),
242	GFP_KERNEL);
243	if (!dpi_connector) {
244	ret = -ENOMEM;
245	goto fail;
246	}
247	connector = &dpi_connector->base;
248
249	dpi_connector->encoder = dpi->encoder;
250	dpi_connector->dpi = dpi;
251
252	drm_connector_init(dev, connector, &vc4_dpi_connector_funcs,
253	DRM_MODE_CONNECTOR_DPI);
254	drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs);
255
256	connector->polled = 0;
257	connector->interlace_allowed = 0;
258	connector->doublescan_allowed = 0;
259
260	drm_mode_connector_attach_encoder(connector, dpi->encoder);
261
262	return connector;
263
264	fail:
265	if (connector)
266	vc4_dpi_connector_destroy(connector);
267
268	return ERR_PTR(ret);
269	}
270
271	static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
272	.destroy = drm_encoder_cleanup,
273	};
274
275	static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
276	{
277	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
278	struct vc4_dpi *dpi = vc4_encoder->dpi;
279
280	drm_panel_disable(dpi->panel);
281
282	clk_disable_unprepare(dpi->pixel_clock);
283
284	drm_panel_unprepare(dpi->panel);
285	}
286
287	static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
288	{
289	struct drm_display_mode *mode = &encoder->crtc->mode;
290	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
291	struct vc4_dpi *dpi = vc4_encoder->dpi;
292	u32 dpi_c = DPI_ENABLE \| DPI_OUTPUT_ENABLE_MODE;
293	int ret;
294
295	ret = drm_panel_prepare(dpi->panel);
296	if (ret) {
297	DRM_ERROR("Panel failed to prepare\n");
298	return;
299	}
300
301	if (dpi->connector->display_info.num_bus_formats) {
302	u32 bus_format = dpi->connector->display_info.bus_formats[0];
303
304	switch (bus_format) {
305	case MEDIA_BUS_FMT_RGB888_1X24:
306	dpi_c \|= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
307	DPI_FORMAT);
308	break;
309	case MEDIA_BUS_FMT_BGR888_1X24:
310	dpi_c \|= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
311	DPI_FORMAT);
312	dpi_c \|= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER);
313	break;
314	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
315	dpi_c \|= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2,
316	DPI_FORMAT);
317	break;
318	case MEDIA_BUS_FMT_RGB666_1X18:
319	dpi_c \|= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1,
320	DPI_FORMAT);
321	break;
322	case MEDIA_BUS_FMT_RGB565_1X16:
323	dpi_c \|= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3,
324	DPI_FORMAT);
325	break;
326	default:
327	DRM_ERROR("Unknown media bus format %d\n", bus_format);
328	break;
329	}
330	}
331
332	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
333	dpi_c \|= DPI_HSYNC_INVERT;
334	else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
335	dpi_c \|= DPI_HSYNC_DISABLE;
336
337	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
338	dpi_c \|= DPI_VSYNC_INVERT;
339	else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
340	dpi_c \|= DPI_VSYNC_DISABLE;
341
342	DPI_WRITE(DPI_C, dpi_c);
343
344	ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000);
345	if (ret)
346	DRM_ERROR("Failed to set clock rate: %d\n", ret);
347
348	ret = clk_prepare_enable(dpi->pixel_clock);
349	if (ret)
350	DRM_ERROR("Failed to set clock rate: %d\n", ret);
351
352	ret = drm_panel_enable(dpi->panel);
353	if (ret) {
354	DRM_ERROR("Panel failed to enable\n");
355	drm_panel_unprepare(dpi->panel);
356	return;
357	}
358	}
359
360	static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
361	.disable = vc4_dpi_encoder_disable,
362	.enable = vc4_dpi_encoder_enable,
363	};
364
365	static const struct of_device_id vc4_dpi_dt_match[] = {
366	{ .compatible = "brcm,bcm2835-dpi", .data = NULL },
367	{}
368	};
369
370	/* Walks the OF graph to find the panel node and then asks DRM to look
371	* up the panel.
372	*/
373	static struct drm_panel vc4_dpi_get_panel(struct device dev)
374	{
375	struct device_node endpoint, panel_node;
376	struct device_node *np = dev->of_node;
377	struct drm_panel *panel;
378
379	endpoint = of_graph_get_next_endpoint(np, NULL);
380	if (!endpoint) {
381	dev_err(dev, "no endpoint to fetch DPI panel\n");
382	return NULL;
383	}
384
385	/* don't proceed if we have an endpoint but no panel_node tied to it */
386	panel_node = of_graph_get_remote_port_parent(endpoint);
387	of_node_put(endpoint);
388	if (!panel_node) {
389	dev_err(dev, "no valid panel node\n");
390	return NULL;
391	}
392
393	panel = of_drm_find_panel(panel_node);
394	of_node_put(panel_node);
395
396	return panel;
397	}
398
399	static int vc4_dpi_bind(struct device dev, struct device master, void *data)
400	{
401	struct platform_device *pdev = to_platform_device(dev);
402	struct drm_device *drm = dev_get_drvdata(master);
403	struct vc4_dev *vc4 = to_vc4_dev(drm);
404	struct vc4_dpi *dpi;
405	struct vc4_dpi_encoder *vc4_dpi_encoder;
406	int ret;
407
408	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
409	if (!dpi)
410	return -ENOMEM;
411
412	vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder),
413	GFP_KERNEL);
414	if (!vc4_dpi_encoder)
415	return -ENOMEM;
416	vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI;
417	vc4_dpi_encoder->dpi = dpi;
418	dpi->encoder = &vc4_dpi_encoder->base.base;
419
420	dpi->pdev = pdev;
421	dpi->regs = vc4_ioremap_regs(pdev, 0);
422	if (IS_ERR(dpi->regs))
423	return PTR_ERR(dpi->regs);
424
425	vc4_dpi_dump_regs(dpi);
426
427	if (DPI_READ(DPI_ID) != DPI_ID_VALUE) {
428	dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n",
429	DPI_READ(DPI_ID), DPI_ID_VALUE);
430	return -ENODEV;
431	}
432
433	dpi->core_clock = devm_clk_get(dev, "core");
434	if (IS_ERR(dpi->core_clock)) {
435	ret = PTR_ERR(dpi->core_clock);
436	if (ret != -EPROBE_DEFER)
437	DRM_ERROR("Failed to get core clock: %d\n", ret);
438	return ret;
439	}
440	dpi->pixel_clock = devm_clk_get(dev, "pixel");
441	if (IS_ERR(dpi->pixel_clock)) {
442	ret = PTR_ERR(dpi->pixel_clock);
443	if (ret != -EPROBE_DEFER)
444	DRM_ERROR("Failed to get pixel clock: %d\n", ret);
445	return ret;
446	}
447
448	ret = clk_prepare_enable(dpi->core_clock);
449	if (ret)
450	DRM_ERROR("Failed to turn on core clock: %d\n", ret);
451
452	dpi->panel = vc4_dpi_get_panel(dev);
453
454	drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs,
455	DRM_MODE_ENCODER_DPI, NULL);
456	drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);
457
458	dpi->connector = vc4_dpi_connector_init(drm, dpi);
459	if (IS_ERR(dpi->connector)) {
460	ret = PTR_ERR(dpi->connector);
461	goto err_destroy_encoder;
462	}
463
464	if (dpi->panel)
465	drm_panel_attach(dpi->panel, dpi->connector);
466
467	dev_set_drvdata(dev, dpi);
468
469	vc4->dpi = dpi;
470
471	return 0;
472
473	err_destroy_encoder:
474	drm_encoder_cleanup(dpi->encoder);
475	clk_disable_unprepare(dpi->core_clock);
476	return ret;
477	}
478
479	static void vc4_dpi_unbind(struct device dev, struct device master,
480	void *data)
481	{
482	struct drm_device *drm = dev_get_drvdata(master);
483	struct vc4_dev *vc4 = to_vc4_dev(drm);
484	struct vc4_dpi *dpi = dev_get_drvdata(dev);
485
486	if (dpi->panel)
487	drm_panel_detach(dpi->panel);
488
489	vc4_dpi_connector_destroy(dpi->connector);
490	drm_encoder_cleanup(dpi->encoder);
491
492	clk_disable_unprepare(dpi->core_clock);
493
494	vc4->dpi = NULL;
495	}
496
497	static const struct component_ops vc4_dpi_ops = {
498	.bind = vc4_dpi_bind,
499	.unbind = vc4_dpi_unbind,
500	};
501
502	static int vc4_dpi_dev_probe(struct platform_device *pdev)
503	{
504	return component_add(&pdev->dev, &vc4_dpi_ops);
505	}
506
507	static int vc4_dpi_dev_remove(struct platform_device *pdev)
508	{
509	component_del(&pdev->dev, &vc4_dpi_ops);
510	return 0;
511	}
512
513	struct platform_driver vc4_dpi_driver = {
514	.probe = vc4_dpi_dev_probe,
515	.remove = vc4_dpi_dev_remove,
516	.driver = {
517	.name = "vc4_dpi",
518	.of_match_table = vc4_dpi_dt_match,
519	},
520	};