linux_kernel/drivers/gpu/drm/imx/dw_hdmi-imx.c

/* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
 *
 * derived from imx-hdmi.c(renamed to bridge/dw_hdmi.c now)
 *
 * 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.
 */
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/component.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <drm/bridge/dw_hdmi.h>
#include <video/imx-ipu-v3.h>
#include <linux/regmap.h>
#include <drm/drm_of.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder_slave.h>

#include "imx-drm.h"

struct imx_hdmi {
	struct device *dev;
	struct drm_encoder encoder;
	struct regmap *regmap;
};

static inline struct imx_hdmi *enc_to_imx_hdmi(struct drm_encoder *e)
{
	return container_of(e, struct imx_hdmi, encoder);
}

static const struct dw_hdmi_mpll_config imx_mpll_cfg[] = {
	{
		45250000, {
			{ 0x01e0, 0x0000 },
			{ 0x21e1, 0x0000 },
			{ 0x41e2, 0x0000 }
		},
	}, {
		92500000, {
			{ 0x0140, 0x0005 },
			{ 0x2141, 0x0005 },
			{ 0x4142, 0x0005 },
	},
	}, {
		148500000, {
			{ 0x00a0, 0x000a },
			{ 0x20a1, 0x000a },
			{ 0x40a2, 0x000a },
		},
	}, {
		216000000, {
			{ 0x00a0, 0x000a },
			{ 0x2001, 0x000f },
			{ 0x4002, 0x000f },
		},
	}, {
		~0UL, {
			{ 0x0000, 0x0000 },
			{ 0x0000, 0x0000 },
			{ 0x0000, 0x0000 },
		},
	}
};

static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
	/*      pixelclk     bpp8    bpp10   bpp12 */
	{
		54000000, { 0x091c, 0x091c, 0x06dc },
	}, {
		58400000, { 0x091c, 0x06dc, 0x06dc },
	}, {
		72000000, { 0x06dc, 0x06dc, 0x091c },
	}, {
		74250000, { 0x06dc, 0x0b5c, 0x091c },
	}, {
		118800000, { 0x091c, 0x091c, 0x06dc },
	}, {
		216000000, { 0x06dc, 0x0b5c, 0x091c },
	}, {
		~0UL, { 0x0000, 0x0000, 0x0000 },
	},
};

/*
 * Resistance term 133Ohm Cfg
 * PREEMP config 0.00
 * TX/CK level 10
 */
static const struct dw_hdmi_phy_config imx_phy_config[] = {
	/*pixelclk   symbol   term   vlev */
	{ 216000000, 0x800d, 0x0005, 0x01ad},
	{ ~0UL,      0x0000, 0x0000, 0x0000}
};

static int dw_hdmi_imx_parse_dt(struct imx_hdmi *hdmi)
{
	struct device_node *np = hdmi->dev->of_node;

	hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
	if (IS_ERR(hdmi->regmap)) {
		dev_err(hdmi->dev, "Unable to get gpr\n");
		return PTR_ERR(hdmi->regmap);
	}

	return 0;
}

static void dw_hdmi_imx_encoder_disable(struct drm_encoder *encoder)
{
}

static void dw_hdmi_imx_encoder_enable(struct drm_encoder *encoder)
{
	struct imx_hdmi *hdmi = enc_to_imx_hdmi(encoder);
	int mux = drm_of_encoder_active_port_id(hdmi->dev->of_node, encoder);

	regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
			   IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
			   mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
}

static int dw_hdmi_imx_atomic_check(struct drm_encoder *encoder,
				    struct drm_crtc_state *crtc_state,
				    struct drm_connector_state *conn_state)
{
	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);

	imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
	imx_crtc_state->di_hsync_pin = 2;
	imx_crtc_state->di_vsync_pin = 3;

	return 0;
}

static const struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
	.enable     = dw_hdmi_imx_encoder_enable,
	.disable    = dw_hdmi_imx_encoder_disable,
	.atomic_check = dw_hdmi_imx_atomic_check,
};

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

static enum drm_mode_status
imx6q_hdmi_mode_valid(struct drm_connector *con,
		      const struct drm_display_mode *mode)
{
	if (mode->clock < 13500)
		return MODE_CLOCK_LOW;
	/* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
	if (mode->clock > 216000)
		return MODE_CLOCK_HIGH;

	return MODE_OK;
}

static enum drm_mode_status
imx6dl_hdmi_mode_valid(struct drm_connector *con,
		       const struct drm_display_mode *mode)
{
	if (mode->clock < 13500)
		return MODE_CLOCK_LOW;
	/* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
	if (mode->clock > 216000)
		return MODE_CLOCK_HIGH;

	return MODE_OK;
}

static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
	.mpll_cfg   = imx_mpll_cfg,
	.cur_ctr    = imx_cur_ctr,
	.phy_config = imx_phy_config,
	.mode_valid = imx6q_hdmi_mode_valid,
};

static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
	.mpll_cfg = imx_mpll_cfg,
	.cur_ctr  = imx_cur_ctr,
	.phy_config = imx_phy_config,
	.mode_valid = imx6dl_hdmi_mode_valid,
};

static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
	{ .compatible = "fsl,imx6q-hdmi",
	  .data = &imx6q_hdmi_drv_data
	}, {
	  .compatible = "fsl,imx6dl-hdmi",
	  .data = &imx6dl_hdmi_drv_data
	},
	{},
};
MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);

static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
			    void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	const struct dw_hdmi_plat_data *plat_data;
	const struct of_device_id *match;
	struct drm_device *drm = data;
	struct drm_encoder *encoder;
	struct imx_hdmi *hdmi;
	int ret;

	if (!pdev->dev.of_node)
		return -ENODEV;

	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
	if (!hdmi)
		return -ENOMEM;

	match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
	plat_data = match->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;

	ret = dw_hdmi_imx_parse_dt(hdmi);
	if (ret < 0)
		return ret;

	drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
	drm_encoder_init(drm, encoder, &dw_hdmi_imx_encoder_funcs,
			 DRM_MODE_ENCODER_TMDS, NULL);

	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)
		drm_encoder_cleanup(encoder);

	return ret;
}

static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
			       void *data)
{
	return dw_hdmi_unbind(dev);
}

static const struct component_ops dw_hdmi_imx_ops = {
	.bind	= dw_hdmi_imx_bind,
	.unbind	= dw_hdmi_imx_unbind,
};

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

static int dw_hdmi_imx_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &dw_hdmi_imx_ops);

	return 0;
}

static struct platform_driver dw_hdmi_imx_platform_driver = {
	.probe  = dw_hdmi_imx_probe,
	.remove = dw_hdmi_imx_remove,
	.driver = {
		.name = "dwhdmi-imx",
		.of_match_table = dw_hdmi_imx_dt_ids,
	},
};

module_platform_driver(dw_hdmi_imx_platform_driver);

MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dwhdmi-imx");