inno_hdmi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
 *    Zheng Yang <zhengyang@rock-chips.com>
 *    Yakir Yang <ykk@rock-chips.com>
 */

#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/hdmi.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>

#include "rockchip_drm_drv.h"

#include "inno_hdmi.h"

#define INNO_HDMI_MIN_TMDS_CLOCK  25000000U

struct inno_hdmi_phy_config {
	unsigned long pixelclock;
	u8 pre_emphasis;
	u8 voltage_level_control;
};

struct inno_hdmi_variant {
	struct inno_hdmi_phy_config *phy_configs;
	struct inno_hdmi_phy_config *default_phy_config;
};

struct inno_hdmi_i2c {
	struct i2c_adapter adap;

	u8 ddc_addr;
	u8 segment_addr;

	struct mutex lock;
	struct completion cmp;
};

struct inno_hdmi {
	struct device *dev;

	struct clk *pclk;
	struct clk *refclk;
	void __iomem *regs;

	struct drm_connector	connector;
	struct rockchip_encoder	encoder;

	struct inno_hdmi_i2c *i2c;
	struct i2c_adapter *ddc;

	const struct inno_hdmi_variant *variant;
};

struct inno_hdmi_connector_state {
	struct drm_connector_state	base;
	unsigned int			enc_out_format;
	unsigned int			colorimetry;
	bool				rgb_limited_range;
};

static struct inno_hdmi *encoder_to_inno_hdmi(struct drm_encoder *encoder)
{
	struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder);

	return container_of(rkencoder, struct inno_hdmi, encoder);
}

static struct inno_hdmi *connector_to_inno_hdmi(struct drm_connector *connector)
{
	return container_of(connector, struct inno_hdmi, connector);
}

#define to_inno_hdmi_conn_state(conn_state) \
	container_of_const(conn_state, struct inno_hdmi_connector_state, base)

enum {
	CSC_RGB_0_255_TO_ITU601_16_235_8BIT,
	CSC_RGB_0_255_TO_ITU709_16_235_8BIT,
	CSC_RGB_0_255_TO_RGB_16_235_8BIT,
};

static const char coeff_csc[][24] = {
	/*
	 * RGB2YUV:601 SD mode:
	 *   Cb = -0.291G - 0.148R + 0.439B + 128
	 *   Y  = 0.504G  + 0.257R + 0.098B + 16
	 *   Cr = -0.368G + 0.439R - 0.071B + 128
	 */
	{
		0x11, 0x5f, 0x01, 0x82, 0x10, 0x23, 0x00, 0x80,
		0x02, 0x1c, 0x00, 0xa1, 0x00, 0x36, 0x00, 0x1e,
		0x11, 0x29, 0x10, 0x59, 0x01, 0x82, 0x00, 0x80
	},
	/*
	 * RGB2YUV:709 HD mode:
	 *   Cb = - 0.338G - 0.101R + 0.439B + 128
	 *   Y  = 0.614G   + 0.183R + 0.062B + 16
	 *   Cr = - 0.399G + 0.439R - 0.040B + 128
	 */
	{
		0x11, 0x98, 0x01, 0xc1, 0x10, 0x28, 0x00, 0x80,
		0x02, 0x74, 0x00, 0xbb, 0x00, 0x3f, 0x00, 0x10,
		0x11, 0x5a, 0x10, 0x67, 0x01, 0xc1, 0x00, 0x80
	},
	/*
	 * RGB[0:255]2RGB[16:235]:
	 *   R' = R x (235-16)/255 + 16;
	 *   G' = G x (235-16)/255 + 16;
	 *   B' = B x (235-16)/255 + 16;
	 */
	{
		0x00, 0x00, 0x03, 0x6F, 0x00, 0x00, 0x00, 0x10,
		0x03, 0x6F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
		0x00, 0x00, 0x00, 0x00, 0x03, 0x6F, 0x00, 0x10
	},
};

static struct inno_hdmi_phy_config rk3036_hdmi_phy_configs[] = {
	{  74250000, 0x3f, 0xbb },
	{ 165000000, 0x6f, 0xbb },
	{      ~0UL, 0x00, 0x00 }
};

static struct inno_hdmi_phy_config rk3128_hdmi_phy_configs[] = {
	{  74250000, 0x3f, 0xaa },
	{ 165000000, 0x5f, 0xaa },
	{      ~0UL, 0x00, 0x00 }
};

static int inno_hdmi_find_phy_config(struct inno_hdmi *hdmi,
				     unsigned long pixelclk)
{
	const struct inno_hdmi_phy_config *phy_configs =
						hdmi->variant->phy_configs;
	int i;

	for (i = 0; phy_configs[i].pixelclock != ~0UL; i++) {
		if (pixelclk <= phy_configs[i].pixelclock)
			return i;
	}

	DRM_DEV_DEBUG(hdmi->dev, "No phy configuration for pixelclock %lu\n",
		      pixelclk);

	return -EINVAL;
}

static inline u8 hdmi_readb(struct inno_hdmi *hdmi, u16 offset)
{
	return readl_relaxed(hdmi->regs + (offset) * 0x04);
}

static inline void hdmi_writeb(struct inno_hdmi *hdmi, u16 offset, u32 val)
{
	writel_relaxed(val, hdmi->regs + (offset) * 0x04);
}

static inline void hdmi_modb(struct inno_hdmi *hdmi, u16 offset,
			     u32 msk, u32 val)
{
	u8 temp = hdmi_readb(hdmi, offset) & ~msk;

	temp |= val & msk;
	hdmi_writeb(hdmi, offset, temp);
}

static void inno_hdmi_i2c_init(struct inno_hdmi *hdmi, unsigned long long rate)
{
	unsigned long long ddc_bus_freq = rate >> 2;

	do_div(ddc_bus_freq, HDMI_SCL_RATE);

	hdmi_writeb(hdmi, DDC_BUS_FREQ_L, ddc_bus_freq & 0xFF);
	hdmi_writeb(hdmi, DDC_BUS_FREQ_H, (ddc_bus_freq >> 8) & 0xFF);

	/* Clear the EDID interrupt flag and mute the interrupt */
	hdmi_writeb(hdmi, HDMI_INTERRUPT_MASK1, 0);
	hdmi_writeb(hdmi, HDMI_INTERRUPT_STATUS1, m_INT_EDID_READY);
}

static void inno_hdmi_sys_power(struct inno_hdmi *hdmi, bool enable)
{
	if (enable)
		hdmi_modb(hdmi, HDMI_SYS_CTRL, m_POWER, v_PWR_ON);
	else
		hdmi_modb(hdmi, HDMI_SYS_CTRL, m_POWER, v_PWR_OFF);