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path: root/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
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/*
* Analogix DP (Display Port) core interface driver.
*
* Copyright (C) 2012 Samsung Electronics Co., Ltd.
* Author: Jingoo Han <jg1.han@samsung.com>
*
* 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/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/component.h>
#include <linux/phy/phy.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>

#include <drm/bridge/analogix_dp.h>

#include "analogix_dp_core.h"
#include "analogix_dp_reg.h"

#define to_dp(nm)	container_of(nm, struct analogix_dp_device, nm)

struct bridge_init {
	struct i2c_client *client;
	struct device_node *node;
};

static void analogix_dp_init_dp(struct analogix_dp_device *dp)
{
	analogix_dp_reset(dp);

	analogix_dp_swreset(dp);

	analogix_dp_init_analog_param(dp);
	analogix_dp_init_interrupt(dp);

	/* SW defined function Normal operation */
	analogix_dp_enable_sw_function(dp);

	analogix_dp_config_interrupt(dp);
	analogix_dp_init_analog_func(dp);

	analogix_dp_init_hpd(dp);
	analogix_dp_init_aux(dp);
}

static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
{
	int timeout_loop = 0;

	while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) {
		if (analogix_dp_get_plug_in_status(dp) == 0)
			return 0;

		timeout_loop++;
		usleep_range(10, 11);
	}

	/*
	 * Some edp screen do not have hpd signal, so we can't just
	 * return failed when hpd plug in detect failed, DT property
	 * "force-hpd" would indicate whether driver need this.
	 */
	if (!dp->force_hpd)
		return -ETIMEDOUT;

	/*
	 * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH
	 * will not work, so we need to give a force hpd action to
	 * set HPD_STATUS manually.
	 */
	dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n");

	analogix_dp_force_hpd(dp);

	if (analogix_dp_get_plug_in_status(dp) != 0) {
		dev_err(dp->dev, "failed to get hpd plug in status\n");
		return -EINVAL;
	}

	dev_dbg(dp->dev, "success to get plug in status after force hpd\n");

	return 0;
}

int analogix_dp_psr_supported(struct analogix_dp_device *dp)
{

	return dp->psr_support;
}
EXPORT_SYMBOL_GPL(analogix_dp_psr_supported);

int analogix_dp_enable_psr(struct analogix_dp_device *dp)
{
	struct edp_vsc_psr psr_vsc;

	if (!dp->psr_support)
		return 0;

	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
	memset(&psr_vsc, 0, sizeof(psr_vsc));
	psr_vsc.sdp_header.HB0 = 0;
	psr_vsc.sdp_header.HB1 = 0x7;
	psr_vsc.sdp_header.HB2 = 0x2;
	psr_vsc.sdp_header.HB3 = 0x8;

	psr_vsc.DB0 = 0;
	psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;

	analogix_dp_send_psr_spd(dp, &psr_vsc);
	return 0;
}
EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);

int analogix_dp_disable_psr(struct analogix_dp_device *dp)
{
	struct edp_vsc_psr psr_vsc;
	int ret;

	if (!dp->psr_support)
		return 0;

	/* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
	memset(&psr_vsc, 0, sizeof(psr_vsc));
	psr_vsc.sdp_header.HB0 = 0;
	psr_vsc.sdp_header.HB1 = 0x7;
	psr_vsc.sdp_header.HB2 = 0x2;
	psr_vsc.sdp_header.HB3 = 0x8;

	psr_vsc.DB0 = 0;
	psr_vsc.DB1 = 0;

	ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
	if (ret != 1)
		dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret);

	analogix_dp_send_psr_spd(dp, &psr_vsc);
	return 0;
}
EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);

static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
{
	unsigned char psr_version;

	drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version);
	dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version);

	return (psr_version & DP_PSR_IS_SUPPORTED) ? true : false;
}

static void analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
{
	unsigned char psr_en;

	/* Disable psr function */
	drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en);
	psr_en &= ~DP_PSR_ENABLE;
	drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);

	/* Main-Link transmitter remains active during PSR active states */
	psr_en = DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION;
	drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);

	/* Enable psr function */
	psr_en = DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE |
		 DP_PSR_CRC_VERIFICATION;
	drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);

	analogix_dp_enable_psr_crc(dp);
}

static void
analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp,
				       bool enable)
{
	u8 data;

	drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data);

	if (enable)
		drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
				   DP_LANE_COUNT_ENHANCED_FRAME_EN |
					DPCD_LANE_COUNT_SET(data));
	else
		drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
				   DPCD_LANE_COUNT_SET(data));
}

static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp)
{
	u8 data;
	int retval;

	drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
	retval = DPCD_ENHANCED_FRAME_CAP(data);

	return retval;
}

static void analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
{
	u8 data;

	data = analogix_dp_is_enhanced_mode_available(dp);
	analogix_dp_enable_rx_to_enhanced_mode(dp, data);
	analogix_dp_enable_enhanced_mode(dp, data);
}

static void analogix_dp_training_pattern_dis(struct analogix_dp_device *dp)
{
	analogix_dp_set_training_pattern(dp, DP_NONE);

	drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
			   DP_TRAINING_PATTERN_DISABLE);
}

static void
analogix_dp_set_lane_lane_pre_emphasis(struct analogix_dp_device *dp,
				       int pre_emphasis, int lane)
{
	switch (lane) {
	case 0:
		analogix_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
		break;
	case 1:
		analogix_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
		break;

	case 2:
		analogix_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
		break;

	case 3:
		analogix_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
		break;
	}
}

static int analogix_dp_link_start(struct analogix_dp_device *dp)
{
	u8 buf[4];
	int lane, lane_count, pll_tries, retval;

	lane_count = dp->link_train.lane_count;

	dp->link_train.lt_state = CLOCK_RECOVERY;
	dp->link_train.eq_loop = 0;

	for (lane = 0; lane < lane_count; lane++)
		dp->link_train.cr_loop[lane] = 0;

	/* Set link rate and count as you want to establish*/
	analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
	analogix_dp_set_lane_count(dp, dp->link_train.lane_count);

	/* Setup RX configuration */
	buf[0] = dp->link_train.link_rate;
	buf[1] = dp->link_train.lane_count;
	retval = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, 2);
	if (retval < 0)
		return retval;

	/* Set TX pre-emphasis to minimum */
	for (lane = 0; lane < lane_count; lane++)
		analogix_dp_set_lane_lane_pre_emphasis(dp,
			PRE_EMPHASIS_LEVEL_0, lane);

	/* Wait for PLL lock */
	pll_tries = 0;
	while (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
		if (pll_tries == DP_TIMEOUT_LOOP_COUNT) {
			dev_err(dp->dev, "Wait for PLL lock timed out\n");
			return -ETIMEDOUT;
		}

		pll_tries++;
		usleep_range(90, 120);
	}

	/* Set training pattern 1 */
	analogix_dp_set_training_pattern(dp, TRAINING_PTN1);

	/* Set RX training pattern */
	retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
				    DP_LINK_SCRAMBLING_DISABLE |
					DP_TRAINING_PATTERN_1);
	if (retval < 0)
		return retval;

	for (lane = 0; lane < lane_count; lane++)
		buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
			    DP_TRAIN_VOLTAGE_SWING_LEVEL_0;

	retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, buf,
				   lane_count);
	if (retval < 0)
		return retval;

	return 0;
}

static unsigned char analogix_dp_get_lane_status(u8 link_status[2], int lane)
{
	int shift = (lane & 1) * 4;
	u8 link_value = link_status[lane >> 1];

	return (link_value >> shift) & 0xf;
}

static int analogix_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
{
	int lane;
	u8 lane_status;

	for (lane = 0; lane < lane_count; lane++) {
		lane_status = analogix_dp_get_lane_status(link_status, lane);
		if ((lane_status & DP_LANE_CR_DONE) == 0)
			return -EINVAL;
	}
	return 0;
}

static int analogix_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
				     int lane_count)
{
	int lane;
	u8 lane_status;

	if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0)
		return -EINVAL;

	for (lane = 0; lane < lane_count; lane++) {
		lane_status = analogix_dp_get_lane_status(link_status, lane);
		lane_status &= DP_CHANNEL_EQ_BITS;
		if (lane_status != DP_CHANNEL_EQ_BITS)
			return -EINVAL;
	}

	return 0;
}

static unsigned char
analogix_dp_get_adjust_request_voltage(u8 adjust_request[2], int lane)
{
	int shift = (lane & 1) * 4;
	u8 link_value = adjust_request[lane >> 1];

	return (link_value >> shift) & 0x3;
}

static unsigned char analogix_dp_get_adjust_request_pre_emphasis(
					u8 adjust_request[2],
					int lane)
{
	int shift = (lane & 1) * 4;
	u8 link_value = adjust_request[lane >> 1];

	return ((link_value >> shift) & 0xc) >> 2;
}

static void analogix_dp_set_lane_link_training(struct analogix_dp_device *dp,
					       u8 training_lane_set, int lane)
{
	switch (lane) {
	case 0:
		analogix_dp_set_lane0_link_training(dp, training_lane_set);
		break;
	case 1:
		analogix_dp_set_lane1_link_training(dp, training_lane_set);
		break;

	case 2:
		analogix_dp_set_lane2_link_training(dp, training_lane_set);
		break;

	case 3:
		analogix_dp_set_lane3_link_training(dp, training_lane_set);
		break;
	}
}

static unsigned int
analogix_dp_get_lane_link_training(struct analogix_dp_device *dp,
				   int lane)
{
	u32 reg;

	switch (lane) {
	case 0:
		reg = analogix_dp_get_lane0_link_training(dp);
		break;
	case 1:
		reg = analogix_dp_get_lane1_link_training(dp);
		break;
	case 2:
		reg = analogix_dp_get_lane2_link_training(dp);
		break;
	case 3:
		reg = analogix_dp_get_lane3_link_training(dp);
		break;
	default:
		WARN_ON(1);
		return 0;
	}

	return reg;
}

static void analogix_dp_reduce_link_rate(struct analogix_dp_device *dp)
{
	analogix_dp_training_pattern_dis(dp);
	analogix_dp_set_enhanced_mode(dp);

	dp->link_train.lt_state = FAILED;
}

static void analogix_dp_get_adjust_training_lane(struct analogix_dp_device *dp,
						 u8 adjust_request[2])
{
	int lane, lane_count;
	u8 voltage_swing, pre_emphasis, training_lane;

	lane_count = dp->link_train.lane_count;
	for (lane = 0; lane < lane_count; lane++) {
		voltage_swing = analogix_dp_get_adjust_request_voltage(
						adjust_request, lane);
		pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
						adjust_request, lane);
		training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
				DPCD_PRE_EMPHASIS_SET(pre_emphasis);

		if (voltage_swing == VOLTAGE_LEVEL_3)
			training_lane |= DP_TRAIN_MAX_SWING_REACHED;
		if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
			training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;

		dp->link_train.training_lane[lane] = training_lane;
	}
}

static int analogix_dp_process_clock_recovery(struct analogix_dp_device *dp)
{
	int lane, lane_count, retval;
	u8 voltage_swing, pre_emphasis, training_lane;
	u8 link_status[2], adjust_request[2];

	usleep_range(100, 101);

	lane_count = dp->link_train.lane_count;

	retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
	if (retval < 0)
		return retval;

	retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
				  adjust_request, 2);
	if (retval < 0)
		return retval;

	if (analogix_dp_clock_recovery_ok(link_status, lane_count) == 0) {
		/* set training pattern 2 for EQ */
		analogix_dp_set_training_pattern(dp, TRAINING_PTN2);

		retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
					    DP_LINK_SCRAMBLING_DISABLE |
						DP_TRAINING_PATTERN_2);
		if (retval < 0)
			return retval;

		dev_info(dp->dev, "Link Training Clock Recovery success\n");
		dp->link_train.lt_state = EQUALIZER_TRAINING;
	} else {
		for (lane = 0; lane < lane_count; lane++) {
			training_lane = analogix_dp_get_lane_link_training(
							dp, lane);
			voltage_swing = analogix_dp_get_adjust_request_voltage(
							adjust_request, lane);
			pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis(
							adjust_request, lane);

			if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
					voltage_swing &&
			    DPCD_PRE_EMPHASIS_GET(training_lane) ==
					pre_emphasis)
				dp->link_train.cr_loop[lane]++;

			if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
			    voltage_swing == VOLTAGE_LEVEL_3 ||
			    pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
				dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
					dp->link_train.cr_loop[lane],
					voltage_swing, pre_emphasis);
				analogix_dp_reduce_link_rate(dp);
				return -EIO;
			}
		}
	}

	analogix_dp_get_adjust_training_lane(dp, adjust_request);

	for (lane = 0; lane < lane_count; lane++)
		analogix_dp_set_lane_link_training(dp,
			dp->link_train.training_lane[lane], lane);

	retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
				   dp->link_train.training_lane, lane_count);
	if (retval < 0)
		return retval;

	return 0;
}

static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
{
	int lane, lane_count, retval;
	u32 reg;
	u8 link_align, link_status[2], adjust_request[2];

	usleep_range(400, 401);

	lane_count = dp->link_train.lane_count;

	retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
	if (retval < 0)
		return retval;

	if (analogix_dp_clock_recovery_ok(link_status, lane_count)) {
		analogix_dp_reduce_link_rate(dp);
		return -EIO;
	}

	retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
				  adjust_request, 2);
	if (retval < 0)
		return retval;

	retval = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED,
				   &link_align);
	if (retval < 0)
		return retval;

	analogix_dp_get_adjust_training_lane(dp, adjust_request);

	if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) {
		/* traing pattern Set to Normal */
		analogix_dp_training_pattern_dis(dp);

		dev_info(dp->dev, "Link Training success!\n");

		analogix_dp_get_link_bandwidth(dp, &reg);
		dp->link_train.link_rate = reg;
		dev_dbg(dp->dev, "final bandwidth = %.2x\n",
			dp->link_train.link_rate);

		analogix_dp_get_lane_count(dp, &reg);
		dp->link_train.lane_count = reg;
		dev_dbg(dp->dev, "final lane count = %.2x\n",
			dp->link_train.lane_count);

		/* set enhanced mode if available */
		analogix_dp_set_enhanced_mode(dp);
		dp->link_train.lt_state = FINISHED;

		return 0;
	}

	/* not all locked */
	dp->link_train.eq_loop++;

	if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
		dev_err(dp->dev, "EQ Max loop\n");
		analogix_dp_reduce_link_rate(dp);
		return -EIO;
	}

	for (lane = 0; lane < lane_count; lane++)
		analogix_dp_set_lane_link_training(dp,
			dp->link_train.training_lane[lane], lane);

	retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
				   dp->link_train.training_lane, lane_count);
	if (retval < 0)
		return retval;

	return 0;
}

static void analogix_dp_get_max_rx_bandwidth(struct analogix_dp_device *dp,
					     u8 *bandwidth)
{
	u8 data;

	/*
	 * For DP rev.1.1, Maximum link rate of Main Link lanes
	 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
	 * For DP rev.1.2, Maximum link rate of Main Link lanes
	 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps
	 */
	drm_dp_dpcd_readb(&dp->aux, DP_MAX_LINK_RATE, &data);
	*bandwidth = data;
}

static void analogix_dp_get_max_rx_lane_count(struct analogix_dp_device *dp,
					      u8 *lane_count)
{
	u8 data;

	/*
	 * For DP rev.1.1, Maximum number of Main Link lanes
	 * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
	 */
	drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
	*lane_count = DPCD_MAX_LANE_COUNT(data);
}

static void analogix_dp_init_training(struct analogix_dp_device *dp,
				      enum link_lane_count_type max_lane,
				      int max_rate)
{
	/*
	 * MACRO_RST must be applied after the PLL_LOCK to avoid
	 * the DP inter pair skew issue for at least 10 us
	 */
	analogix_dp_reset_macro(dp);

	/* Initialize by reading RX's DPCD */
	analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
	analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);

	if ((dp->link_train.link_rate != DP_LINK_BW_1_62) &&
	    (dp->link_train.link_rate != DP_LINK_BW_2_7) &&
	    (dp->link_train.link_rate != DP_LINK_BW_5_4)) {
		dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
			dp->link_train.link_rate);
		dp->link_train.link_rate = DP_LINK_BW_1_62;
	}

	if (dp->link_train.lane_count == 0) {
		dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
			dp->link_train.lane_count);
		dp->link_train.lane_count = (u8)LANE_COUNT1;
	}

	/* Setup TX lane count & rate */
	if (dp->link_train.lane_count > max_lane)
		dp->link_train.lane_count = max_lane;
	if (dp->link_train.link_rate > max_rate)
		dp->link_train.link_rate = max_rate;

	/* All DP analog module power up */
	analogix_dp_set_analog_power_down(dp, POWER_ALL, 0);
}

static int analogix_dp_sw_link_training(struct analogix_dp_device *dp)
{
	int retval = 0, training_finished = 0;

	dp->link_train.lt_state = START;

	/* Process here */
	while (!retval && !training_finished) {
		switch (dp->link_train.lt_state) {
		case START:
			retval = analogix_dp_link_start(dp);
			if (retval)
				dev_err(dp->dev, "LT link start failed!\n");
			break;
		case CLOCK_RECOVERY:
			retval = analogix_dp_process_clock_recovery(dp);
			if (retval)
				dev_err(dp->dev, "LT CR failed!\n");
			break;
		case EQUALIZER_TRAINING:
			retval = analogix_dp_process_equalizer_training(dp);
			if (retval)
				dev_err(dp->dev, "LT EQ failed!\n");
			break;
		case FINISHED:
			training_finished = 1;
			break;
		case FAILED:
			return -EREMOTEIO;
		}
	}
	if (retval)
		dev_err(dp->dev, "eDP link training failed (%d)\n", retval);

	return retval;
}

static int analogix_dp_set_link_train(struct analogix_dp_device *dp,
				      u32 count, u32 bwtype)
{
	int i;
	int retval;

	for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
		analogix_dp_init_training(dp, count, bwtype);
		retval = analogix_dp_sw_link_training(dp);
		if (retval == 0)
			break;

		usleep_range(100, 110);
	}

	return retval;
}

static int analogix_dp_config_video(struct analogix_dp_device *dp)
{
	int timeout_loop = 0;
	int done_count = 0;

	analogix_dp_config_video_slave_mode(dp);

	analogix_dp_set_video_color_format(dp);

	if (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
		dev_err(dp->dev, "PLL is not locked yet.\n");
		return -EINVAL;
	}

	for (;;) {
		timeout_loop++;
		if (analogix_dp_is_slave_video_stream_clock_on(dp) == 0)
			break;
		if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
			dev_err(dp->dev, "Timeout of video streamclk ok\n");
			return -ETIMEDOUT;
		}

		usleep_range(1, 2);
	}

	/* Set to use the register calculated M/N video */
	analogix_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);

	/* For video bist, Video timing must be generated by register */
	analogix_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);

	/* Disable video mute */
	analogix_dp_enable_video_mute(dp, 0);

	/* Configure video slave mode */
	analogix_dp_enable_video_master(dp, 0);

	timeout_loop = 0;

	for (;;) {
		timeout_loop++;
		if (analogix_dp_is_video_stream_on(dp) == 0) {
			done_count++;
			if (done_count > 10)
				break;
		} else if (done_count) {
			done_count = 0;
		}
		if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
			dev_err(dp->dev, "Timeout of video streamclk ok\n");
			return -ETIMEDOUT;
		}

		usleep_range(1000, 1001);
	}

	return 0;
}

static void analogix_dp_enable_scramble(struct analogix_dp_device *dp,
					bool enable)
{
	u8 data;

	if (enable) {
		analogix_dp_enable_scrambling(dp);

		drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data);
		drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
				   (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
	} else {
		analogix_dp_disable_scrambling(dp);

		drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data);
		drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
				   (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
	}
}

static irqreturn_t analogix_dp_hardirq(int irq, void *arg)
{
	struct analogix_dp_device *dp = arg;
	irqreturn_t ret = IRQ_NONE;
	enum dp_irq_type irq_type;

	irq_type = analogix_dp_get_irq_type(dp);
	if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
		analogix_dp_mute_hpd_interrupt(dp);
		ret = IRQ_WAKE_THREAD;
	}

	return ret;
}

static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
{
	struct analogix_dp_device *dp = arg;
	enum dp_irq_type irq_type;

	irq_type = analogix_dp_get_irq_type(dp);
	if (irq_type & DP_IRQ_TYPE_HP_CABLE_IN ||
	    irq_type & DP_IRQ_TYPE_HP_CABLE_OUT) {
		dev_dbg(dp->dev, "Detected cable status changed!\n");
		if (dp->drm_dev)
			drm_helper_hpd_irq_event(dp->drm_dev);
	}

	if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
		analogix_dp_clear_hotplug_interrupts(dp);
		analogix_dp_unmute_hpd_interrupt(dp);
	}

	return IRQ_HANDLED;
}

static void analogix_dp_commit(struct analogix_dp_device *dp)
{
	int ret;

	/* Keep the panel disabled while we configure video */
	if (dp->plat_data->panel) {
		if (drm_panel_disable(dp->plat_data->panel))
			DRM_ERROR("failed to disable the panel\n");
	}

	ret = analogix_dp_set_link_train(dp, dp->video_info.max_lane_count,
					 dp->video_info.max_link_rate);
	if (ret) {
		dev_err(dp->dev, "unable to do link train\n");
		return;
	}

	analogix_dp_enable_scramble(dp, 1);
	analogix_dp_enable_rx_to_enhanced_mode(dp, 1);
	analogix_dp_enable_enhanced_mode(dp, 1);

	analogix_dp_init_video(dp);
	ret = analogix_dp_config_video(dp);
	if (ret)
		dev_err(dp->dev, "unable to config video\n");

	/* Safe to enable the panel now */
	if (dp->plat_data->panel) {
		if (drm_panel_enable(dp->plat_data->panel))
			DRM_ERROR("failed to enable the panel\n");
	}

	/* Enable video */
	analogix_dp_start_video(dp);

	dp->psr_support = analogix_dp_detect_sink_psr(dp);
	if (dp->psr_support)
		analogix_dp_enable_sink_psr(dp);
}

/*
 * This function is a bit of a catch-all for panel preparation, hopefully
 * simplifying the logic of functions that need to prepare/unprepare the panel
 * below.
 *
 * If @prepare is true, this function will prepare the panel. Conversely, if it
 * is false, the panel will be unprepared.
 *
 * If @is_modeset_prepare is true, the function will disregard the current state
 * of the panel and either prepare/unprepare the panel based on @prepare. Once
 * it finishes, it will update dp->panel_is_modeset to reflect the current state
 * of the panel.
 */
static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
				     bool prepare, bool is_modeset_prepare)
{
	int ret = 0;

	if (!dp->plat_data->panel)
		return 0;

	mutex_lock(&dp->panel_lock);

	/*
	 * Exit early if this is a temporary prepare/unprepare and we're already
	 * modeset (since we neither want to prepare twice or unprepare early).
	 */
	if (dp->panel_is_modeset && !is_modeset_prepare)
		goto out;

	if (prepare)
		ret = drm_panel_prepare(dp->plat_data->panel);
	else
		ret = drm_panel_unprepare(dp->plat_data->panel);

	if (ret)
		goto out;

	if (is_modeset_prepare)
		dp->panel_is_modeset = prepare;

out:
	mutex_unlock(&dp->panel_lock);
	return ret;
}

static int analogix_dp_get_modes(struct drm_connector *connector)
{
	struct analogix_dp_device *dp = to_dp(connector);
	struct edid *edid;
	int ret, num_modes = 0;

	if (dp->plat_data->panel) {
		num_modes += drm_panel_get_modes(dp->plat_data->panel);
	} else {
		ret = analogix_dp_prepare_panel(dp, true, false);
		if (ret) {
			DRM_ERROR("Failed to prepare panel (%d)\n", ret);
			return 0;
		}

		pm_runtime_get_sync(dp->dev);
		edid = drm_get_edid(connector, &dp->aux.ddc);
		pm_runtime_put(dp->dev);
		if (edid) {
			drm_mode_connector_update_edid_property(&dp->connector,
								edid);
			num_modes += drm_add_edid_modes(&dp->connector, edid);
			kfree(edid);
		}

		ret = analogix_dp_prepare_panel(dp, false, false);
		if (ret)
			DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
	}

	if (dp->plat_data->get_modes)
		num_modes += dp->plat_data->get_modes(dp->plat_data, connector);

	return num_modes;
}

static struct drm_encoder *
analogix_dp_best_encoder(struct drm_connector *connector)
{
	struct analogix_dp_device *dp = to_dp(connector);

	return dp->encoder;
}

static const struct drm_connector_helper_funcs analogix_dp_connector_helper_funcs = {
	.get_modes = analogix_dp_get_modes,
	.best_encoder = analogix_dp_best_encoder,
};

static enum drm_connector_status
analogix_dp_detect(struct drm_connector *connector, bool force)
{
	struct analogix_dp_device *dp = to_dp(connector);
	enum drm_connector_status status = connector_status_disconnected;
	int ret;

	if (dp->plat_data->panel)
		return connector_status_connected;

	ret = analogix_dp_prepare_panel(dp, true, false);
	if (ret) {
		DRM_ERROR("Failed to prepare panel (%d)\n", ret);
		return connector_status_disconnected;
	}

	if (!analogix_dp_detect_hpd(dp))
		status = connector_status_connected;

	ret = analogix_dp_prepare_panel(dp, false, false);
	if (ret)
		DRM_ERROR("Failed to unprepare panel (%d)\n", ret);

	return status;
}

static const struct drm_connector_funcs analogix_dp_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = analogix_dp_detect,
	.destroy = drm_connector_cleanup,
	.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 int analogix_dp_bridge_attach(struct drm_bridge *bridge)
{
	struct analogix_dp_device *dp = bridge->driver_private;
	struct drm_encoder *encoder = dp->encoder;
	struct drm_connector *connector = NULL;
	int ret = 0;

	if (!bridge->encoder) {
		DRM_ERROR("Parent encoder object not found");
		return -ENODEV;
	}

	if (!dp->plat_data->skip_connector) {
		connector = &dp->connector;
		connector->polled = DRM_CONNECTOR_POLL_HPD;

		ret = drm_connector_init(dp->drm_dev, connector,
					 &analogix_dp_connector_funcs,
					 DRM_MODE_CONNECTOR_eDP);
		if (ret) {
			DRM_ERROR("Failed to initialize connector with drm\n");
			return ret;
		}

		drm_connector_helper_add(connector,
					 &analogix_dp_connector_helper_funcs);
		drm_mode_connector_attach_encoder(connector, encoder);
	}

	/*
	 * NOTE: the connector registration is implemented in analogix
	 * platform driver, that to say connector would be exist after
	 * plat_data->attch return, that's why we record the connector
	 * point after plat attached.
	 */
	 if (dp->plat_data->attach) {
		 ret = dp->plat_data->attach(dp->plat_data, bridge, connector);
		 if (ret) {
			 DRM_ERROR("Failed at platform attch func\n");
			 return ret;
		 }
	}

	if (dp->plat_data->panel) {
		ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
		if (ret) {
			DRM_ERROR("Failed to attach panel\n");
			return ret;
		}
	}

	return 0;
}

static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
{
	struct analogix_dp_device *dp = bridge->driver_private;
	int ret;

	ret = analogix_dp_prepare_panel(dp, true, true);
	if (ret)
		DRM_ERROR("failed to setup the panel ret = %d\n", ret);
}

static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
{
	struct analogix_dp_device *dp = bridge->driver_private;

	if (dp->dpms_mode == DRM_MODE_DPMS_ON)
		return;

	pm_runtime_get_sync(dp->dev);

	if (dp->plat_data->power_on)
		dp->plat_data->power_on(dp->plat_data);

	phy_power_on(dp->phy);
	analogix_dp_init_dp(dp);
	enable_irq(dp->irq);
	analogix_dp_commit(dp);

	dp->dpms_mode = DRM_MODE_DPMS_ON;
}

static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
{
	struct analogix_dp_device *dp = bridge->driver_private;
	int ret;

	if (dp->dpms_mode != DRM_MODE_DPMS_ON)
		return;

	if (dp->plat_data->panel) {
		if (drm_panel_disable(dp->plat_data->panel)) {
			DRM_ERROR("failed to disable the panel\n");
			return;
		}
	}

	disable_irq(dp->irq);
	phy_power_off(dp->phy);

	if (dp->plat_data->power_off)
		dp->plat_data->power_off(dp->plat_data);

	pm_runtime_put_sync(dp->dev);

	ret = analogix_dp_prepare_panel(dp, false, true);
	if (ret)
		DRM_ERROR("failed to setup the panel ret = %d\n", ret);

	dp->dpms_mode = DRM_MODE_DPMS_OFF;
}

static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
					struct drm_display_mode *orig_mode,
					struct drm_display_mode *mode)
{
	struct analogix_dp_device *dp = bridge->driver_private;
	struct drm_display_info *display_info = &dp->connector.display_info;
	struct video_info *video = &dp->video_info;
	struct device_node *dp_node = dp->dev->of_node;
	int vic;

	/* Input video interlaces & hsync pol & vsync pol */
	video->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
	video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
	video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);

	/* Input video dynamic_range & colorimetry */
	vic = drm_match_cea_mode(mode);
	if ((vic == 6) || (vic == 7) || (vic == 21) || (vic == 22) ||
	    (vic == 2) || (vic == 3) || (vic == 17) || (vic == 18)) {
		video->dynamic_range = CEA;
		video->ycbcr_coeff = COLOR_YCBCR601;
	} else if (vic) {
		video->dynamic_range = CEA;
		video->ycbcr_coeff = COLOR_YCBCR709;
	} else {
		video->dynamic_range = VESA;
		video->ycbcr_coeff = COLOR_YCBCR709;
	}

	/* Input vide bpc and color_formats */
	switch (display_info->bpc) {
	case 12:
		video->color_depth = COLOR_12;
		break;
	case 10:
		video->color_depth = COLOR_10;
		break;
	case 8:
		video->color_depth = COLOR_8;
		break;
	case 6:
		video->color_depth = COLOR_6;
		break;
	default:
		video->color_depth = COLOR_8;
		break;
	}
	if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
		video->color_space = COLOR_YCBCR444;
	else if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
		video->color_space = COLOR_YCBCR422;
	else if (display_info->color_formats & DRM_COLOR_FORMAT_RGB444)
		video->color_space = COLOR_RGB;
	else
		video->color_space = COLOR_RGB;

	/*
	 * NOTE: those property parsing code is used for providing backward
	 * compatibility for samsung platform.
	 * Due to we used the "of_property_read_u32" interfaces, when this
	 * property isn't present, the "video_info" can keep the original
	 * values and wouldn't be modified.
	 */
	of_property_read_u32(dp_node, "samsung,color-space",
			     &video->color_space);
	of_property_read_u32(dp_node, "samsung,dynamic-range",
			     &video->dynamic_range);
	of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
			     &video->ycbcr_coeff);
	of_property_read_u32(dp_node, "samsung,color-depth",
			     &video->color_depth);
	if (of_property_read_bool(dp_node, "hsync-active-high"))
		video->h_sync_polarity = true;
	if (of_property_read_bool(dp_node, "vsync-active-high"))
		video->v_sync_polarity = true;
	if (of_property_read_bool(dp_node, "interlaced"))
		video->interlaced = true;
}

static void analogix_dp_bridge_nop(struct drm_bridge *bridge)
{
	/* do nothing */
}

static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
	.pre_enable = analogix_dp_bridge_pre_enable,
	.enable = analogix_dp_bridge_enable,
	.disable = analogix_dp_bridge_disable,
	.post_disable = analogix_dp_bridge_nop,
	.mode_set = analogix_dp_bridge_mode_set,
	.attach = analogix_dp_bridge_attach,
};

static int analogix_dp_create_bridge(struct drm_device *drm_dev,
				     struct analogix_dp_device *dp)
{
	struct drm_bridge *bridge;
	int ret;

	bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
	if (!bridge) {
		DRM_ERROR("failed to allocate for drm bridge\n");
		return -ENOMEM;
	}

	dp->bridge = bridge;

	bridge->driver_private = dp;
	bridge->funcs = &analogix_dp_bridge_funcs;

	ret = drm_bridge_attach(dp->encoder, bridge, NULL);
	if (ret) {
		DRM_ERROR("failed to attach drm bridge\n");
		return -EINVAL;
	}

	return 0;
}

static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
{
	struct device_node *dp_node = dp->dev->of_node;
	struct video_info *video_info = &dp->video_info;

	switch (dp->plat_data->dev_type) {
	case RK3288_DP:
	case RK3399_EDP:
		/*
		 * Like Rk3288 DisplayPort TRM indicate that "Main link
		 * containing 4 physical lanes of 2.7/1.62 Gbps/lane".
		 */
		video_info->max_link_rate = 0x0A;
		video_info->max_lane_count = 0x04;
		break;
	case EXYNOS_DP:
		/*
		 * NOTE: those property parseing code is used for
		 * providing backward compatibility for samsung platform.
		 */
		of_property_read_u32(dp_node, "samsung,link-rate",
				     &video_info->max_link_rate);
		of_property_read_u32(dp_node, "samsung,lane-count",
				     &video_info->max_lane_count);
		break;
	}

	return 0;
}

static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
				       struct drm_dp_aux_msg *msg)
{
	struct analogix_dp_device *dp = to_dp(aux);

	return analogix_dp_transfer(dp, msg);
}

struct analogix_dp_device *
analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
		 struct analogix_dp_plat_data *plat_data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct analogix_dp_device *dp;
	struct resource *res;
	unsigned int irq_flags;
	int ret;

	if (!plat_data) {
		dev_err(dev, "Invalided input plat_data\n");
		return ERR_PTR(-EINVAL);
	}

	dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL);
	if (!dp)
		return ERR_PTR(-ENOMEM);

	dp->dev = &pdev->dev;
	dp->dpms_mode = DRM_MODE_DPMS_OFF;

	mutex_init(&dp->panel_lock);
	dp->panel_is_modeset = false;

	/*
	 * platform dp driver need containor_of the plat_data to get
	 * the driver private data, so we need to store the point of
	 * plat_data, not the context of plat_data.
	 */
	dp->plat_data = plat_data;

	ret = analogix_dp_dt_parse_pdata(dp);
	if (ret)
		return ERR_PTR(ret);

	dp->phy = devm_phy_get(dp->dev, "dp");
	if (IS_ERR(dp->phy)) {
		dev_err(dp->dev, "no DP phy configured\n");
		ret = PTR_ERR(dp->phy);
		if (ret) {
			/*
			 * phy itself is not enabled, so we can move forward
			 * assigning NULL to phy pointer.
			 */
			if (ret == -ENOSYS || ret == -ENODEV)
				dp->phy = NULL;
			else
				return ERR_PTR(ret);
		}
	}

	dp->clock = devm_clk_get(&pdev->dev, "dp");
	if (IS_ERR(dp->clock)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		return ERR_CAST(dp->clock);
	}

	clk_prepare_enable(dp->clock);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(dp->reg_base))
		return ERR_CAST(dp->reg_base);

	dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");

	dp->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0);
	if (!gpio_is_valid(dp->hpd_gpio))
		dp->hpd_gpio = of_get_named_gpio(dev->of_node,
						 "samsung,hpd-gpio", 0);

	if (gpio_is_valid(dp->hpd_gpio)) {
		/*
		 * Set up the hotplug GPIO from the device tree as an interrupt.
		 * Simply specifying a different interrupt in the device tree
		 * doesn't work since we handle hotplug rather differently when
		 * using a GPIO.  We also need the actual GPIO specifier so
		 * that we can get the current state of the GPIO.
		 */
		ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN,
					    "hpd_gpio");
		if (ret) {
			dev_err(&pdev->dev, "failed to get hpd gpio\n");
			return ERR_PTR(ret);
		}
		dp->irq = gpio_to_irq(dp->hpd_gpio);
		irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
	} else {
		dp->hpd_gpio = -ENODEV;
		dp->irq = platform_get_irq(pdev, 0);
		irq_flags = 0;
	}

	if (dp->irq == -ENXIO) {
		dev_err(&pdev->dev, "failed to get irq\n");
		return ERR_PTR(-ENODEV);
	}

	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
					analogix_dp_hardirq,
					analogix_dp_irq_thread,
					irq_flags, "analogix-dp", dp);
	if (ret) {
		dev_err(&pdev->dev, "failed to request irq\n");
		goto err_disable_pm_runtime;
	}
	disable_irq(dp->irq);

	dp->drm_dev = drm_dev;
	dp->encoder = dp->plat_data->encoder;

	dp->aux.name = "DP-AUX";
	dp->aux.transfer = analogix_dpaux_transfer;
	dp->aux.dev = &pdev->dev;

	ret = drm_dp_aux_register(&dp->aux);
	if (ret)
		return ERR_PTR(ret);

	pm_runtime_enable(dev);

	ret = analogix_dp_create_bridge(drm_dev, dp);
	if (ret) {
		DRM_ERROR("failed to create bridge (%d)\n", ret);
		goto err_disable_pm_runtime;
	}

	return dp;

err_disable_pm_runtime:

	pm_runtime_disable(dev);

	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(analogix_dp_bind);

void analogix_dp_unbind(struct analogix_dp_device *dp)
{
	analogix_dp_bridge_disable(dp->bridge);
	dp->connector.funcs->destroy(&dp->connector);

	if (dp->plat_data->panel) {
		if (drm_panel_unprepare(dp->plat_data->panel))
			DRM_ERROR("failed to turnoff the panel\n");
		if (drm_panel_detach(dp->plat_data->panel))
			DRM_ERROR("failed to detach the panel\n");
	}

	drm_dp_aux_unregister(&dp->aux);
	pm_runtime_disable(dp->dev);
	clk_disable_unprepare(dp->clock);
}
EXPORT_SYMBOL_GPL(analogix_dp_unbind);

#ifdef CONFIG_PM
int analogix_dp_suspend(struct analogix_dp_device *dp)
{
	clk_disable_unprepare(dp->clock);

	if (dp->plat_data->panel) {
		if (drm_panel_unprepare(dp->plat_data->panel))
			DRM_ERROR("failed to turnoff the panel\n");
	}

	return 0;
}
EXPORT_SYMBOL_GPL(analogix_dp_suspend);

int analogix_dp_resume(struct analogix_dp_device *dp)
{
	int ret;

	ret = clk_prepare_enable(dp->clock);
	if (ret < 0) {
		DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
		return ret;
	}

	if (dp->plat_data->panel) {
		if (drm_panel_prepare(dp->plat_data->panel)) {
			DRM_ERROR("failed to setup the panel\n");
			return -EBUSY;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(analogix_dp_resume);
#endif

int analogix_dp_start_crc(struct drm_connector *connector)
{
	struct analogix_dp_device *dp = to_dp(connector);

	if (!connector->state->crtc) {
		DRM_ERROR("Connector %s doesn't currently have a CRTC.\n",
			  connector->name);
		return -EINVAL;
	}

	return drm_dp_start_crc(&dp->aux, connector->state->crtc);
}
EXPORT_SYMBOL_GPL(analogix_dp_start_crc);

int analogix_dp_stop_crc(struct drm_connector *connector)
{
	struct analogix_dp_device *dp = to_dp(connector);

	return drm_dp_stop_crc(&dp->aux);
}
EXPORT_SYMBOL_GPL(analogix_dp_stop_crc);

MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("Analogix DP Core Driver");
MODULE_LICENSE("GPL v2");