drivers/staging/msm/mdp_vsync.c - kernel/skids - Git at Google

 /* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/time.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/hrtimer.h>
 #include <linux/vmalloc.h>
 #include <linux/clk.h>

 #include <mach/hardware.h>
 #include <linux/io.h>

 #include <asm/system.h>
 #include <asm/mach-types.h>
 #include <linux/semaphore.h>
 #include <linux/uaccess.h>
 #include <mach/gpio.h>

 #include "mdp.h"
 #include "msm_fb.h"
 #include "mddihost.h"

 #ifdef CONFIG_FB_MSM_MDP40
 #define MDP_SYNC_CFG_0		0x100
 #define MDP_SYNC_STATUS_0	0x10c
 #define MDP_PRIM_VSYNC_OUT_CTRL	0x118
 #define MDP_PRIM_VSYNC_INIT_VAL	0x128
 #else
 #define MDP_SYNC_CFG_0		0x300
 #define MDP_SYNC_STATUS_0	0x30c
 #define MDP_PRIM_VSYNC_OUT_CTRL	0x318
 #define MDP_PRIM_VSYNC_INIT_VAL	0x328
 #endif

 extern mddi_lcd_type mddi_lcd_idx;
 extern spinlock_t mdp_spin_lock;
 extern struct workqueue_struct *mdp_vsync_wq;
 extern int lcdc_mode;
 extern int vsync_mode;

 #ifdef MDP_HW_VSYNC
 int vsync_above_th = 4;
 int vsync_start_th = 1;
 int vsync_load_cnt;

 struct clk *mdp_vsync_clk;

 void mdp_hw_vsync_clk_enable(struct msm_fb_data_type *mfd)
 {
 	if (mfd->use_mdp_vsync)
 		clk_enable(mdp_vsync_clk);
 }

 void mdp_hw_vsync_clk_disable(struct msm_fb_data_type *mfd)
 {
 	if (mfd->use_mdp_vsync)
 		clk_disable(mdp_vsync_clk);
 }
 #endif

 static void mdp_set_vsync(unsigned long data)
 {
 	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)data;
 	struct msm_fb_panel_data *pdata = NULL;

 	pdata = (struct msm_fb_panel_data *)mfd->pdev->dev.platform_data;

 	if ((pdata) && (pdata->set_vsync_notifier == NULL))
 		return;

 	init_timer(&mfd->vsync_resync_timer);
 	mfd->vsync_resync_timer.function = mdp_set_vsync;
 	mfd->vsync_resync_timer.data = data;
 	mfd->vsync_resync_timer.expires =
 	    jiffies + mfd->panel_info.lcd.vsync_notifier_period;
 	add_timer(&mfd->vsync_resync_timer);

 	if ((mfd->panel_info.lcd.vsync_enable) && (mfd->panel_power_on)
 	    && (!mfd->vsync_handler_pending)) {
 		mfd->vsync_handler_pending = TRUE;
 		if (!queue_work(mdp_vsync_wq, &mfd->vsync_resync_worker)) {
 			MSM_FB_INFO
 			    ("mdp_set_vsync: can't queue_work! -> needs to increase vsync_resync_timer_duration\n");
 		}
 	} else {
 		MSM_FB_DEBUG
 		    ("mdp_set_vsync failed!  EN:%d  PWR:%d  PENDING:%d\n",
 		     mfd->panel_info.lcd.vsync_enable, mfd->panel_power_on,
 		     mfd->vsync_handler_pending);
 	}
 }

 static void mdp_vsync_handler(void *data)
 {
 	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)data;

 	if (mfd->use_mdp_vsync) {
 #ifdef MDP_HW_VSYNC
 		if (mfd->panel_power_on)
 			MDP_OUTP(MDP_BASE + MDP_SYNC_STATUS_0, vsync_load_cnt);

 		mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_OFF, TRUE);
 #endif
 	} else {
 		mfd->last_vsync_timetick = ktime_get_real();
 	}

 	mfd->vsync_handler_pending = FALSE;
 }

 irqreturn_t mdp_hw_vsync_handler_proxy(int irq, void *data)
 {
 	/*
 	 * ToDo: tried enabling/disabling GPIO MDP HW VSYNC interrupt
 	 * but getting inaccurate timing in mdp_vsync_handler()
 	 * disable_irq(MDP_HW_VSYNC_IRQ);
 	 */
 	mdp_vsync_handler(data);

 	return IRQ_HANDLED;
 }

 #ifdef MDP_HW_VSYNC
 static void mdp_set_sync_cfg_0(struct msm_fb_data_type *mfd, int vsync_cnt)
 {
 	unsigned long cfg;

 	cfg = mfd->total_lcd_lines - 1;
 	cfg <<= MDP_SYNCFG_HGT_LOC;
 	if (mfd->panel_info.lcd.hw_vsync_mode)
 		cfg |= MDP_SYNCFG_VSYNC_EXT_EN;
 	cfg |= (MDP_SYNCFG_VSYNC_INT_EN | vsync_cnt);

 	MDP_OUTP(MDP_BASE + MDP_SYNC_CFG_0, cfg);
 }
 #endif

 void mdp_config_vsync(struct msm_fb_data_type *mfd)
 {

 	/* vsync on primary lcd only for now */
 	if ((mfd->dest != DISPLAY_LCD) || (mfd->panel_info.pdest != DISPLAY_1)
 	    || (!vsync_mode)) {
 		goto err_handle;
 	}

 	if (mfd->panel_info.lcd.vsync_enable) {
 		mfd->total_porch_lines = mfd->panel_info.lcd.v_back_porch +
 		    mfd->panel_info.lcd.v_front_porch +
 		    mfd->panel_info.lcd.v_pulse_width;
 		mfd->total_lcd_lines =
 		    mfd->panel_info.yres + mfd->total_porch_lines;
 		mfd->lcd_ref_usec_time =
 		    100000000 / mfd->panel_info.lcd.refx100;
 		mfd->vsync_handler_pending = FALSE;
 		mfd->last_vsync_timetick.tv.sec = 0;
 		mfd->last_vsync_timetick.tv.nsec = 0;

 #ifdef MDP_HW_VSYNC
 		if (mdp_vsync_clk == NULL)
 			mdp_vsync_clk = clk_get(NULL, "mdp_vsync_clk");

 		if (IS_ERR(mdp_vsync_clk)) {
 			printk(KERN_ERR "error: can't get mdp_vsync_clk!\n");
 			mfd->use_mdp_vsync = 0;
 		} else
 			mfd->use_mdp_vsync = 1;

 		if (mfd->use_mdp_vsync) {
 			uint32 vsync_cnt_cfg, vsync_cnt_cfg_dem;
 			uint32 mdp_vsync_clk_speed_hz;

 			mdp_vsync_clk_speed_hz = clk_get_rate(mdp_vsync_clk);

 			if (mdp_vsync_clk_speed_hz == 0) {
 				mfd->use_mdp_vsync = 0;
 			} else {
 				/*
 				 * Do this calculation in 2 steps for
 				 * rounding uint32 properly.
 				 */
 				vsync_cnt_cfg_dem =
 				    (mfd->panel_info.lcd.refx100 *
 				     mfd->total_lcd_lines) / 100;
 				vsync_cnt_cfg =
 				    (mdp_vsync_clk_speed_hz) /
 				    vsync_cnt_cfg_dem;

 				/* MDP cmd block enable */
 				mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_ON,
 					      FALSE);
 				mdp_hw_vsync_clk_enable(mfd);

 				mdp_set_sync_cfg_0(mfd, vsync_cnt_cfg);

 				/*
 				 * load the last line + 1 to be in the
 				 * safety zone
 				 */
 				vsync_load_cnt = mfd->panel_info.yres;

 				/* line counter init value at the next pulse */
 				MDP_OUTP(MDP_BASE + MDP_PRIM_VSYNC_INIT_VAL,
 							vsync_load_cnt);

 				/*
 				 * external vsync source pulse width and
 				 * polarity flip
 				 */
 				MDP_OUTP(MDP_BASE + MDP_PRIM_VSYNC_OUT_CTRL,
 							BIT(30) | BIT(0));


 				/* threshold */
 				MDP_OUTP(MDP_BASE + 0x200,
 					 (vsync_above_th << 16) |
 					 (vsync_start_th));

 				mdp_hw_vsync_clk_disable(mfd);
 				/* MDP cmd block disable */
 				mdp_pipe_ctrl(MDP_CMD_BLOCK,
 					      MDP_BLOCK_POWER_OFF, FALSE);
 			}
 		}
 #else
 		mfd->use_mdp_vsync = 0;
 		hrtimer_init(&mfd->dma_hrtimer, CLOCK_MONOTONIC,
 			     HRTIMER_MODE_REL);
 		mfd->dma_hrtimer.function = mdp_dma2_vsync_hrtimer_handler;
 		mfd->vsync_width_boundary = vmalloc(mfd->panel_info.xres * 4);
 #endif

 		mfd->channel_irq = 0;
 		if (mfd->panel_info.lcd.hw_vsync_mode) {
 			u32 vsync_gpio = mfd->vsync_gpio;
 			u32 ret;

 			if (vsync_gpio == -1) {
 				MSM_FB_INFO("vsync_gpio not defined!\n");
 				goto err_handle;
 			}

 			ret = gpio_tlmm_config(GPIO_CFG
 					(vsync_gpio,
 					(mfd->use_mdp_vsync) ? 1 : 0,
 					GPIO_INPUT,
 					GPIO_PULL_DOWN,
 					GPIO_2MA),
 					GPIO_ENABLE);
 			if (ret)
 				goto err_handle;

 			if (!mfd->use_mdp_vsync) {
 				mfd->channel_irq = MSM_GPIO_TO_INT(vsync_gpio);
 				if (request_irq
 				    (mfd->channel_irq,
 				     &mdp_hw_vsync_handler_proxy,
 				     IRQF_TRIGGER_FALLING, "VSYNC_GPIO",
 				     (void *)mfd)) {
 					MSM_FB_INFO
 					("irq=%d failed! vsync_gpio=%d\n",
 						mfd->channel_irq,
 						vsync_gpio);
 					goto err_handle;
 				}
 			}
 		}

 		mdp_set_vsync((unsigned long)mfd);
 	}

 	return;

 err_handle:
 	if (mfd->vsync_width_boundary)
 		vfree(mfd->vsync_width_boundary);
 	mfd->panel_info.lcd.vsync_enable = FALSE;
 	printk(KERN_ERR "%s: failed!\n", __func__);
 }

 void mdp_vsync_resync_workqueue_handler(struct work_struct *work)
 {
 	struct msm_fb_data_type *mfd = NULL;
 	int vsync_fnc_enabled = FALSE;
 	struct msm_fb_panel_data *pdata = NULL;

 	mfd = container_of(work, struct msm_fb_data_type, vsync_resync_worker);

 	if (mfd) {
 		if (mfd->panel_power_on) {
 			pdata =
 			    (struct msm_fb_panel_data *)mfd->pdev->dev.
 			    platform_data;

 			/*
 			 * we need to turn on MDP power if it uses MDP vsync
 			 * HW block in SW mode
 			 */
 			if ((!mfd->panel_info.lcd.hw_vsync_mode) &&
 			    (mfd->use_mdp_vsync) &&
 			    (pdata) && (pdata->set_vsync_notifier != NULL)) {
 				/*
 				 * enable pwr here since we can't enable it in
 				 * vsync callback in isr mode
 				 */
 				mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_ON,
 					      FALSE);
 			}

 			if (pdata->set_vsync_notifier != NULL) {
 				vsync_fnc_enabled = TRUE;
 				pdata->set_vsync_notifier(mdp_vsync_handler,
 							  (void *)mfd);
 			}
 		}
 	}

 	if ((mfd) && (!vsync_fnc_enabled))
 		mfd->vsync_handler_pending = FALSE;
 }

 boolean mdp_hw_vsync_set_handler(msm_fb_vsync_handler_type handler, void *data)
 {
 	/*
 	 * ToDo: tried enabling/disabling GPIO MDP HW VSYNC interrupt
 	 * but getting inaccurate timing in mdp_vsync_handler()
 	 * enable_irq(MDP_HW_VSYNC_IRQ);
 	 */

 	return TRUE;
 }

 uint32 mdp_get_lcd_line_counter(struct msm_fb_data_type *mfd)
 {
 	uint32 elapsed_usec_time;
 	uint32 lcd_line;
 	ktime_t last_vsync_timetick_local;
 	ktime_t curr_time;
 	unsigned long flag;

 	if ((!mfd->panel_info.lcd.vsync_enable) || (!vsync_mode))
 		return 0;

 	spin_lock_irqsave(&mdp_spin_lock, flag);
 	last_vsync_timetick_local = mfd->last_vsync_timetick;
 	spin_unlock_irqrestore(&mdp_spin_lock, flag);

 	curr_time = ktime_get_real();
 	elapsed_usec_time =
 	    ((curr_time.tv.sec - last_vsync_timetick_local.tv.sec) * 1000000) +
 	    ((curr_time.tv.nsec - last_vsync_timetick_local.tv.nsec) / 1000);

 	elapsed_usec_time = elapsed_usec_time % mfd->lcd_ref_usec_time;

 	/* lcd line calculation referencing to line counter = 0 */
 	lcd_line =
 	    (elapsed_usec_time * mfd->total_lcd_lines) / mfd->lcd_ref_usec_time;

 	/* lcd line adjusment referencing to the actual line counter at vsync */
 	lcd_line =
 	    (mfd->total_lcd_lines - mfd->panel_info.lcd.v_back_porch +
 	     lcd_line) % (mfd->total_lcd_lines + 1);

 	if (lcd_line > mfd->total_lcd_lines) {
 		MSM_FB_INFO
 		    ("mdp_get_lcd_line_counter: mdp_lcd_rd_cnt >= mfd->total_lcd_lines error!\n");
 	}

 	return lcd_line;
 }
	/* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/time.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/spinlock.h>
	#include <linux/hrtimer.h>
	#include <linux/vmalloc.h>
	#include <linux/clk.h>

	#include <mach/hardware.h>
	#include <linux/io.h>

	#include <asm/system.h>
	#include <asm/mach-types.h>
	#include <linux/semaphore.h>
	#include <linux/uaccess.h>
	#include <mach/gpio.h>

	#include "mdp.h"
	#include "msm_fb.h"
	#include "mddihost.h"

	#ifdef CONFIG_FB_MSM_MDP40
	#define MDP_SYNC_CFG_0 0x100
	#define MDP_SYNC_STATUS_0 0x10c
	#define MDP_PRIM_VSYNC_OUT_CTRL 0x118
	#define MDP_PRIM_VSYNC_INIT_VAL 0x128
	#else
	#define MDP_SYNC_CFG_0 0x300
	#define MDP_SYNC_STATUS_0 0x30c
	#define MDP_PRIM_VSYNC_OUT_CTRL 0x318
	#define MDP_PRIM_VSYNC_INIT_VAL 0x328
	#endif

	extern mddi_lcd_type mddi_lcd_idx;
	extern spinlock_t mdp_spin_lock;
	extern struct workqueue_struct *mdp_vsync_wq;
	extern int lcdc_mode;
	extern int vsync_mode;

	#ifdef MDP_HW_VSYNC
	int vsync_above_th = 4;
	int vsync_start_th = 1;
	int vsync_load_cnt;

	struct clk *mdp_vsync_clk;

	void mdp_hw_vsync_clk_enable(struct msm_fb_data_type *mfd)
	{
	if (mfd->use_mdp_vsync)
	clk_enable(mdp_vsync_clk);
	}

	void mdp_hw_vsync_clk_disable(struct msm_fb_data_type *mfd)
	{
	if (mfd->use_mdp_vsync)
	clk_disable(mdp_vsync_clk);
	}
	#endif

	static void mdp_set_vsync(unsigned long data)
	{
	struct msm_fb_data_type mfd = (struct msm_fb_data_type )data;
	struct msm_fb_panel_data *pdata = NULL;

	pdata = (struct msm_fb_panel_data *)mfd->pdev->dev.platform_data;

	if ((pdata) && (pdata->set_vsync_notifier == NULL))
	return;

	init_timer(&mfd->vsync_resync_timer);
	mfd->vsync_resync_timer.function = mdp_set_vsync;
	mfd->vsync_resync_timer.data = data;
	mfd->vsync_resync_timer.expires =
	jiffies + mfd->panel_info.lcd.vsync_notifier_period;
	add_timer(&mfd->vsync_resync_timer);

	if ((mfd->panel_info.lcd.vsync_enable) && (mfd->panel_power_on)
	&& (!mfd->vsync_handler_pending)) {
	mfd->vsync_handler_pending = TRUE;
	if (!queue_work(mdp_vsync_wq, &mfd->vsync_resync_worker)) {
	MSM_FB_INFO
	("mdp_set_vsync: can't queue_work! -> needs to increase vsync_resync_timer_duration\n");
	}
	} else {
	MSM_FB_DEBUG
	("mdp_set_vsync failed! EN:%d PWR:%d PENDING:%d\n",
	mfd->panel_info.lcd.vsync_enable, mfd->panel_power_on,
	mfd->vsync_handler_pending);
	}
	}

	static void mdp_vsync_handler(void *data)
	{
	struct msm_fb_data_type mfd = (struct msm_fb_data_type )data;

	if (mfd->use_mdp_vsync) {
	#ifdef MDP_HW_VSYNC
	if (mfd->panel_power_on)
	MDP_OUTP(MDP_BASE + MDP_SYNC_STATUS_0, vsync_load_cnt);

	mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_OFF, TRUE);
	#endif
	} else {
	mfd->last_vsync_timetick = ktime_get_real();
	}

	mfd->vsync_handler_pending = FALSE;
	}

	irqreturn_t mdp_hw_vsync_handler_proxy(int irq, void *data)
	{
	/*
	* ToDo: tried enabling/disabling GPIO MDP HW VSYNC interrupt
	* but getting inaccurate timing in mdp_vsync_handler()
	* disable_irq(MDP_HW_VSYNC_IRQ);
	*/
	mdp_vsync_handler(data);

	return IRQ_HANDLED;
	}

	#ifdef MDP_HW_VSYNC
	static void mdp_set_sync_cfg_0(struct msm_fb_data_type *mfd, int vsync_cnt)
	{
	unsigned long cfg;

	cfg = mfd->total_lcd_lines - 1;
	cfg <<= MDP_SYNCFG_HGT_LOC;
	if (mfd->panel_info.lcd.hw_vsync_mode)
	cfg \|= MDP_SYNCFG_VSYNC_EXT_EN;
	cfg \|= (MDP_SYNCFG_VSYNC_INT_EN \| vsync_cnt);

	MDP_OUTP(MDP_BASE + MDP_SYNC_CFG_0, cfg);
	}
	#endif

	void mdp_config_vsync(struct msm_fb_data_type *mfd)
	{

	/* vsync on primary lcd only for now */
	if ((mfd->dest != DISPLAY_LCD) \|\| (mfd->panel_info.pdest != DISPLAY_1)
	\|\| (!vsync_mode)) {
	goto err_handle;
	}

	if (mfd->panel_info.lcd.vsync_enable) {
	mfd->total_porch_lines = mfd->panel_info.lcd.v_back_porch +
	mfd->panel_info.lcd.v_front_porch +
	mfd->panel_info.lcd.v_pulse_width;
	mfd->total_lcd_lines =
	mfd->panel_info.yres + mfd->total_porch_lines;
	mfd->lcd_ref_usec_time =
	100000000 / mfd->panel_info.lcd.refx100;
	mfd->vsync_handler_pending = FALSE;
	mfd->last_vsync_timetick.tv.sec = 0;
	mfd->last_vsync_timetick.tv.nsec = 0;

	#ifdef MDP_HW_VSYNC
	if (mdp_vsync_clk == NULL)
	mdp_vsync_clk = clk_get(NULL, "mdp_vsync_clk");

	if (IS_ERR(mdp_vsync_clk)) {
	printk(KERN_ERR "error: can't get mdp_vsync_clk!\n");
	mfd->use_mdp_vsync = 0;
	} else
	mfd->use_mdp_vsync = 1;

	if (mfd->use_mdp_vsync) {
	uint32 vsync_cnt_cfg, vsync_cnt_cfg_dem;
	uint32 mdp_vsync_clk_speed_hz;

	mdp_vsync_clk_speed_hz = clk_get_rate(mdp_vsync_clk);

	if (mdp_vsync_clk_speed_hz == 0) {
	mfd->use_mdp_vsync = 0;
	} else {
	/*
	* Do this calculation in 2 steps for
	* rounding uint32 properly.
	*/
	vsync_cnt_cfg_dem =
	(mfd->panel_info.lcd.refx100 *
	mfd->total_lcd_lines) / 100;
	vsync_cnt_cfg =
	(mdp_vsync_clk_speed_hz) /
	vsync_cnt_cfg_dem;

	/* MDP cmd block enable */
	mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_ON,
	FALSE);
	mdp_hw_vsync_clk_enable(mfd);

	mdp_set_sync_cfg_0(mfd, vsync_cnt_cfg);

	/*
	* load the last line + 1 to be in the
	* safety zone
	*/
	vsync_load_cnt = mfd->panel_info.yres;

	/* line counter init value at the next pulse */
	MDP_OUTP(MDP_BASE + MDP_PRIM_VSYNC_INIT_VAL,
	vsync_load_cnt);

	/*
	* external vsync source pulse width and
	* polarity flip
	*/
	MDP_OUTP(MDP_BASE + MDP_PRIM_VSYNC_OUT_CTRL,
	BIT(30) \| BIT(0));


	/* threshold */
	MDP_OUTP(MDP_BASE + 0x200,
	(vsync_above_th << 16) \|
	(vsync_start_th));

	mdp_hw_vsync_clk_disable(mfd);
	/* MDP cmd block disable */
	mdp_pipe_ctrl(MDP_CMD_BLOCK,
	MDP_BLOCK_POWER_OFF, FALSE);
	}
	}
	#else
	mfd->use_mdp_vsync = 0;
	hrtimer_init(&mfd->dma_hrtimer, CLOCK_MONOTONIC,
	HRTIMER_MODE_REL);
	mfd->dma_hrtimer.function = mdp_dma2_vsync_hrtimer_handler;
	mfd->vsync_width_boundary = vmalloc(mfd->panel_info.xres * 4);
	#endif

	mfd->channel_irq = 0;
	if (mfd->panel_info.lcd.hw_vsync_mode) {
	u32 vsync_gpio = mfd->vsync_gpio;
	u32 ret;

	if (vsync_gpio == -1) {
	MSM_FB_INFO("vsync_gpio not defined!\n");
	goto err_handle;
	}

	ret = gpio_tlmm_config(GPIO_CFG
	(vsync_gpio,
	(mfd->use_mdp_vsync) ? 1 : 0,
	GPIO_INPUT,
	GPIO_PULL_DOWN,
	GPIO_2MA),
	GPIO_ENABLE);
	if (ret)
	goto err_handle;

	if (!mfd->use_mdp_vsync) {
	mfd->channel_irq = MSM_GPIO_TO_INT(vsync_gpio);
	if (request_irq
	(mfd->channel_irq,
	&mdp_hw_vsync_handler_proxy,
	IRQF_TRIGGER_FALLING, "VSYNC_GPIO",
	(void *)mfd)) {
	MSM_FB_INFO
	("irq=%d failed! vsync_gpio=%d\n",
	mfd->channel_irq,
	vsync_gpio);
	goto err_handle;
	}
	}
	}

	mdp_set_vsync((unsigned long)mfd);
	}

	return;

	err_handle:
	if (mfd->vsync_width_boundary)
	vfree(mfd->vsync_width_boundary);
	mfd->panel_info.lcd.vsync_enable = FALSE;
	printk(KERN_ERR "%s: failed!\n", __func__);
	}

	void mdp_vsync_resync_workqueue_handler(struct work_struct *work)
	{
	struct msm_fb_data_type *mfd = NULL;
	int vsync_fnc_enabled = FALSE;
	struct msm_fb_panel_data *pdata = NULL;

	mfd = container_of(work, struct msm_fb_data_type, vsync_resync_worker);

	if (mfd) {
	if (mfd->panel_power_on) {
	pdata =
	(struct msm_fb_panel_data *)mfd->pdev->dev.
	platform_data;

	/*
	* we need to turn on MDP power if it uses MDP vsync
	* HW block in SW mode
	*/
	if ((!mfd->panel_info.lcd.hw_vsync_mode) &&
	(mfd->use_mdp_vsync) &&
	(pdata) && (pdata->set_vsync_notifier != NULL)) {
	/*
	* enable pwr here since we can't enable it in
	* vsync callback in isr mode
	*/
	mdp_pipe_ctrl(MDP_CMD_BLOCK, MDP_BLOCK_POWER_ON,
	FALSE);
	}

	if (pdata->set_vsync_notifier != NULL) {
	vsync_fnc_enabled = TRUE;
	pdata->set_vsync_notifier(mdp_vsync_handler,
	(void *)mfd);
	}
	}
	}

	if ((mfd) && (!vsync_fnc_enabled))
	mfd->vsync_handler_pending = FALSE;
	}

	boolean mdp_hw_vsync_set_handler(msm_fb_vsync_handler_type handler, void *data)
	{
	/*
	* ToDo: tried enabling/disabling GPIO MDP HW VSYNC interrupt
	* but getting inaccurate timing in mdp_vsync_handler()
	* enable_irq(MDP_HW_VSYNC_IRQ);
	*/

	return TRUE;
	}

	uint32 mdp_get_lcd_line_counter(struct msm_fb_data_type *mfd)
	{
	uint32 elapsed_usec_time;
	uint32 lcd_line;
	ktime_t last_vsync_timetick_local;
	ktime_t curr_time;
	unsigned long flag;

	if ((!mfd->panel_info.lcd.vsync_enable) \|\| (!vsync_mode))
	return 0;

	spin_lock_irqsave(&mdp_spin_lock, flag);
	last_vsync_timetick_local = mfd->last_vsync_timetick;
	spin_unlock_irqrestore(&mdp_spin_lock, flag);

	curr_time = ktime_get_real();
	elapsed_usec_time =
	((curr_time.tv.sec - last_vsync_timetick_local.tv.sec) * 1000000) +
	((curr_time.tv.nsec - last_vsync_timetick_local.tv.nsec) / 1000);

	elapsed_usec_time = elapsed_usec_time % mfd->lcd_ref_usec_time;

	/* lcd line calculation referencing to line counter = 0 */
	lcd_line =
	(elapsed_usec_time * mfd->total_lcd_lines) / mfd->lcd_ref_usec_time;

	/* lcd line adjusment referencing to the actual line counter at vsync */
	lcd_line =
	(mfd->total_lcd_lines - mfd->panel_info.lcd.v_back_porch +
	lcd_line) % (mfd->total_lcd_lines + 1);

	if (lcd_line > mfd->total_lcd_lines) {
	MSM_FB_INFO
	("mdp_get_lcd_line_counter: mdp_lcd_rd_cnt >= mfd->total_lcd_lines error!\n");
	}

	return lcd_line;
	}