path: root/drivers/video/omap2/displays-new/panel-dsi-cm.c

/*
 * Generic DSI Command Mode panel driver
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 *
 * 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.
 */

/* #define DEBUG */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include <video/omapdss.h>
#include <video/omap-panel-data.h>
#include <video/mipi_display.h>

/* DSI Virtual channel. Hardcoded for now. */
#define TCH 0

#define DCS_READ_NUM_ERRORS	0x05
#define DCS_BRIGHTNESS		0x51
#define DCS_CTRL_DISPLAY	0x53
#define DCS_GET_ID1		0xda
#define DCS_GET_ID2		0xdb
#define DCS_GET_ID3		0xdc

struct panel_drv_data {
	struct omap_dss_device dssdev;
	struct omap_dss_device *in;

	struct omap_video_timings timings;

	struct platform_device *pdev;

	struct mutex lock;

	struct backlight_device *bldev;

	unsigned long	hw_guard_end;	/* next value of jiffies when we can
					 * issue the next sleep in/out command
					 */
	unsigned long	hw_guard_wait;	/* max guard time in jiffies */

	/* panel HW configuration from DT or platform data */
	int reset_gpio;
	int ext_te_gpio;

	bool use_dsi_backlight;

	struct omap_dsi_pin_config pin_config;

	/* runtime variables */
	bool enabled;

	bool te_enabled;

	atomic_t do_update;
	int channel;

	struct delayed_work te_timeout_work;

	bool intro_printed;

	struct workqueue_struct *workqueue;

	bool ulps_enabled;
	unsigned ulps_timeout;
	struct delayed_work ulps_work;
};

#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)

static irqreturn_t dsicm_te_isr(int irq, void *data);
static void dsicm_te_timeout_work_callback(struct work_struct *work);
static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);

static int dsicm_panel_reset(struct panel_drv_data *ddata);

static void dsicm_ulps_work(struct work_struct *work);

static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
{
	ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
	ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
}

static void hw_guard_wait(struct