path: root/drivers/gpu/drm/msm/dp/dp_display.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/component.h>
#include <linux/of_irq.h>
#include <linux/delay.h>
#include <drm/drm_panel.h>

#include "msm_drv.h"
#include "msm_kms.h"
#include "dp_hpd.h"
#include "dp_parser.h"
#include "dp_power.h"
#include "dp_catalog.h"
#include "dp_aux.h"
#include "dp_reg.h"
#include "dp_link.h"
#include "dp_panel.h"
#include "dp_ctrl.h"
#include "dp_display.h"
#include "dp_drm.h"
#include "dp_audio.h"
#include "dp_debug.h"

#define HPD_STRING_SIZE 30

enum {
	ISR_DISCONNECTED,
	ISR_CONNECT_PENDING,
	ISR_CONNECTED,
	ISR_HPD_REPLUG_COUNT,
	ISR_IRQ_HPD_PULSE_COUNT,
	ISR_HPD_LO_GLITH_COUNT,
};

/* event thread connection state */
enum {
	ST_DISCONNECTED,
	ST_CONNECT_PENDING,
	ST_CONNECTED,
	ST_DISCONNECT_PENDING,
	ST_DISPLAY_OFF,
	ST_SUSPENDED,
};

enum {
	EV_NO_EVENT,
	/* hpd events */
	EV_HPD_INIT_SETUP,
	EV_HPD_PLUG_INT,
	EV_IRQ_HPD_INT,
	EV_HPD_UNPLUG_INT,
	EV_USER_NOTIFICATION,
	EV_CONNECT_PENDING_TIMEOUT,
	EV_DISCONNECT_PENDING_TIMEOUT,
};

#define EVENT_TIMEOUT	(HZ/10)	/* 100ms */
#define DP_EVENT_Q_MAX	8

#define DP_TIMEOUT_5_SECOND	(5000/EVENT_TIMEOUT)
#define DP_TIMEOUT_NONE		0

#define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)

struct dp_event {
	u32 event_id;
	u32 data;
	u32 delay;
};

struct dp_display_private {
	char *name;
	int irq;

	unsigned int id;

	/* state variables */
	bool core_initialized;
	bool hpd_irq_on;
	bool audio_supported;

	struct platform_device *pdev;
	struct dentry *root;

	struct dp_usbpd   *usbpd;
	struct dp_parser  *parser;
	struct dp_power   *power;
	struct dp_catalog *catalog;
	struct drm_dp_aux *aux;
	struct dp_link    *link;
	struct dp_panel   *panel;
	struct dp_ctrl    *ctrl;
	struct dp_debug   *debug;

	struct dp_usbpd_cb usbpd_cb;
	struct dp_display_mode dp_mode;
	struct msm_dp dp_display;

	/* wait for audio signaling */
	struct completion audio_comp;

	/* event related only access by event thread */
	struct mutex event_mutex;
	wait_queue_head_t event_q;
	u32 hpd_state;
	u32 event_pndx;
	u32 event_gndx;
	struct dp_event event_list[DP_EVENT_Q_MAX];
	spinlock_t event_lock;

	struct dp_audio *audio;
};

struct msm_dp_desc {
	phys_addr_t io_start;
	unsigned int connector_type;
};

struct msm_dp_config {
	const struct msm_dp_desc *descs;
	size_t num_descs;
};

static const struct msm_dp_config sc7180_dp_cfg = {
	.descs = (const struct msm_dp_desc[]) {
		[MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
	},
	.num_descs = 1,
};

static const struct msm_dp_config sc7280_dp_cfg = {
	.descs = (const struct msm_dp_desc[]) {
		[MSM_DP_CONTROLLER_0] =	{ .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
		[MSM_DP_CONTROLLER_1] =	{ .io_start = 0x0aea0000, .connector_type = DRM_MODE_CONNECTOR_eDP },
	},
	.num_descs = 2,
};

static const struct of_device_id dp_dt_match[] = {
	{ .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
	{ .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_cfg },
	{}
};

static struct dp_display_private *dev_get_dp_display_private(struct device *dev)
{
	struct msm_dp *dp = dev_get_drvdata(dev);

	return container_of(dp, struct dp_display_private, dp_display);
}

static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
						u32 data, u32 delay)
{
	unsigned long flag;
	struct dp_event *todo;
	int pndx;

	spin_lock_irqsave(&dp_priv->event_lock, flag);
	pndx = dp_priv->event_pndx + 1;
	pndx %= DP_EVENT_Q_MAX;
	if (pndx == dp_priv->event_gndx) {
		pr_err("event_q is full: pndx=%d gndx=%d\n",
			dp_priv->event_pndx, dp_priv->event_gndx);
		spin_unlock_irqrestore(&dp_priv->event_lock, flag);
		return -EPERM;
	}
	todo = &dp_priv->event_list[dp_priv->event_pndx++];
	dp_priv->event_pndx %= DP_EVENT_Q_MAX;
	todo->event_id = event;
	todo->data = data;
	todo->del