xref: /OK3568_Linux_fs/kernel/drivers/video/fbdev/omap2/omapfb/dss/venc.c (revision 4882a59341e53eb6f0b4789bf948001014eff981)

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/drivers/video/omap2/dss/venc.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * VENC settings from TI's DSS driver
 */

#define DSS_SUBSYS_NAME "VENC"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/component.h>

#include <video/omapfb_dss.h>

#include "dss.h"
#include "dss_features.h"

/* Venc registers */
#define VENC_REV_ID				0x00
#define VENC_STATUS				0x04
#define VENC_F_CONTROL				0x08
#define VENC_VIDOUT_CTRL			0x10
#define VENC_SYNC_CTRL				0x14
#define VENC_LLEN				0x1C
#define VENC_FLENS				0x20
#define VENC_HFLTR_CTRL				0x24
#define VENC_CC_CARR_WSS_CARR			0x28
#define VENC_C_PHASE				0x2C
#define VENC_GAIN_U				0x30
#define VENC_GAIN_V				0x34
#define VENC_GAIN_Y				0x38
#define VENC_BLACK_LEVEL			0x3C
#define VENC_BLANK_LEVEL			0x40
#define VENC_X_COLOR				0x44
#define VENC_M_CONTROL				0x48
#define VENC_BSTAMP_WSS_DATA			0x4C
#define VENC_S_CARR				0x50
#define VENC_LINE21				0x54
#define VENC_LN_SEL				0x58
#define VENC_L21__WC_CTL			0x5C
#define VENC_HTRIGGER_VTRIGGER			0x60
#define VENC_SAVID__EAVID			0x64
#define VENC_FLEN__FAL				0x68
#define VENC_LAL__PHASE_RESET			0x6C
#define VENC_HS_INT_START_STOP_X		0x70
#define VENC_HS_EXT_START_STOP_X		0x74
#define VENC_VS_INT_START_X			0x78
#define VENC_VS_INT_STOP_X__VS_INT_START_Y	0x7C
#define VENC_VS_INT_STOP_Y__VS_EXT_START_X	0x80
#define VENC_VS_EXT_STOP_X__VS_EXT_START_Y	0x84
#define VENC_VS_EXT_STOP_Y			0x88
#define VENC_AVID_START_STOP_X			0x90
#define VENC_AVID_START_STOP_Y			0x94
#define VENC_FID_INT_START_X__FID_INT_START_Y	0xA0
#define VENC_FID_INT_OFFSET_Y__FID_EXT_START_X	0xA4
#define VENC_FID_EXT_START_Y__FID_EXT_OFFSET_Y	0xA8
#define VENC_TVDETGP_INT_START_STOP_X		0xB0
#define VENC_TVDETGP_INT_START_STOP_Y		0xB4
#define VENC_GEN_CTRL				0xB8
#define VENC_OUTPUT_CONTROL			0xC4
#define VENC_OUTPUT_TEST			0xC8
#define VENC_DAC_B__DAC_C			0xC8

struct venc_config {
	u32 f_control;
	u32 vidout_ctrl;
	u32 sync_ctrl;
	u32 llen;
	u32 flens;
	u32 hfltr_ctrl;
	u32 cc_carr_wss_carr;
	u32 c_phase;
	u32 gain_u;
	u32 gain_v;
	u32 gain_y;
	u32 black_level;
	u32 blank_level;
	u32 x_color;
	u32 m_control;
	u32 bstamp_wss_data;
	u32 s_carr;
	u32 line21;
	u32 ln_sel;
	u32 l21__wc_ctl;
	u32 htrigger_vtrigger;
	u32 savid__eavid;
	u32 flen__fal;
	u32 lal__phase_reset;
	u32 hs_int_start_stop_x;
	u32 hs_ext_start_stop_x;
	u32 vs_int_start_x;
	u32 vs_int_stop_x__vs_int_start_y;
	u32 vs_int_stop_y__vs_ext_start_x;
	u32 vs_ext_stop_x__vs_ext_start_y;
	u32 vs_ext_stop_y;
	u32 avid_start_stop_x;
	u32 avid_start_stop_y;
	u32 fid_int_start_x__fid_int_start_y;
	u32 fid_int_offset_y__fid_ext_start_x;
	u32 fid_ext_start_y__fid_ext_offset_y;
	u32 tvdetgp_int_start_stop_x;
	u32 tvdetgp_int_start_stop_y;
	u32 gen_ctrl;
};

/* from TRM */
static const struct venc_config venc_config_pal_trm = {
	.f_control				= 0,
	.vidout_ctrl				= 1,
	.sync_ctrl				= 0x40,
	.llen					= 0x35F, /* 863 */
	.flens					= 0x270, /* 624 */
	.hfltr_ctrl				= 0,
	.cc_carr_wss_carr			= 0x2F7225ED,
	.c_phase				= 0,
	.gain_u					= 0x111,
	.gain_v					= 0x181,
	.gain_y					= 0x140,
	.black_level				= 0x3B,
	.blank_level				= 0x3B,
	.x_color				= 0x7,
	.m_control				= 0x2,
	.bstamp_wss_data			= 0x3F,
	.s_carr					= 0x2A098ACB,
	.line21					= 0,
	.ln_sel					= 0x01290015,
	.l21__wc_ctl				= 0x0000F603,
	.htrigger_vtrigger			= 0,

	.savid__eavid				= 0x06A70108,
	.flen__fal				= 0x00180270,
	.lal__phase_reset			= 0x00040135,
	.hs_int_start_stop_x			= 0x00880358,
	.hs_ext_start_stop_x			= 0x000F035F,
	.vs_int_start_x				= 0x01A70000,
	.vs_int_stop_x__vs_int_start_y		= 0x000001A7,
	.vs_int_stop_y__vs_ext_start_x		= 0x01AF0000,
	.vs_ext_stop_x__vs_ext_start_y		= 0x000101AF,
	.vs_ext_stop_y				= 0x00000025,
	.avid_start_stop_x			= 0x03530083,
	.avid_start_stop_y			= 0x026C002E,
	.fid_int_start_x__fid_int_start_y	= 0x0001008A,
	.fid_int_offset_y__fid_ext_start_x	= 0x002E0138,
	.fid_ext_start_y__fid_ext_offset_y	= 0x01380001,

	.tvdetgp_int_start_stop_x		= 0x00140001,
	.tvdetgp_int_start_stop_y		= 0x00010001,
	.gen_ctrl				= 0x00FF0000,
};

/* from TRM */
static const struct venc_config venc_config_ntsc_trm = {
	.f_control				= 0,
	.vidout_ctrl				= 1,
	.sync_ctrl				= 0x8040,
	.llen					= 0x359,
	.flens					= 0x20C,
	.hfltr_ctrl				= 0,
	.cc_carr_wss_carr			= 0x043F2631,
	.c_phase				= 0,
	.gain_u					= 0x102,
	.gain_v					= 0x16C,
	.gain_y					= 0x12F,
	.black_level				= 0x43,
	.blank_level				= 0x38,
	.x_color				= 0x7,
	.m_control				= 0x1,
	.bstamp_wss_data			= 0x38,
	.s_carr					= 0x21F07C1F,
	.line21					= 0,
	.ln_sel					= 0x01310011,
	.l21__wc_ctl				= 0x0000F003,
	.htrigger_vtrigger			= 0,

	.savid__eavid				= 0x069300F4,
	.flen__fal				= 0x0016020C,
	.lal__phase_reset			= 0x00060107,
	.hs_int_start_stop_x			= 0x008E0350,
	.hs_ext_start_stop_x			= 0x000F0359,
	.vs_int_start_x				= 0x01A00000,
	.vs_int_stop_x__vs_int_start_y		= 0x020701A0,
	.vs_int_stop_y__vs_ext_start_x		= 0x01AC0024,
	.vs_ext_stop_x__vs_ext_start_y		= 0x020D01AC,
	.vs_ext_stop_y				= 0x00000006,
	.avid_start_stop_x			= 0x03480078,
	.avid_start_stop_y			= 0x02060024,
	.fid_int_start_x__fid_int_start_y	= 0x0001008A,
	.fid_int_offset_y__fid_ext_start_x	= 0x01AC0106,
	.fid_ext_start_y__fid_ext_offset_y	= 0x01060006,

	.tvdetgp_int_start_stop_x		= 0x00140001,
	.tvdetgp_int_start_stop_y		= 0x00010001,
	.gen_ctrl				= 0x00F90000,
};

const struct omap_video_timings omap_dss_pal_timings = {
	.x_res		= 720,
	.y_res		= 574,
	.pixelclock	= 13500000,
	.hsw		= 64,
	.hfp		= 12,
	.hbp		= 68,
	.vsw		= 5,
	.vfp		= 5,
	.vbp		= 41,

	.interlace	= true,
};
EXPORT_SYMBOL(omap_dss_pal_timings);

const struct omap_video_timings omap_dss_ntsc_timings = {
	.x_res		= 720,
	.y_res		= 482,
	.pixelclock	= 13500000,
	.hsw		= 64,
	.hfp		= 16,
	.hbp		= 58,
	.vsw		= 6,
	.vfp		= 6,
	.vbp		= 31,

	.interlace	= true,
};
EXPORT_SYMBOL(omap_dss_ntsc_timings);

static struct {
	struct platform_device *pdev;
	void __iomem *base;
	struct mutex venc_lock;
	u32 wss_data;
	struct regulator *vdda_dac_reg;

	struct clk	*tv_dac_clk;

	struct omap_video_timings timings;
	enum omap_dss_venc_type type;
	bool invert_polarity;

	struct omap_dss_device output;
} venc;

static inline void venc_write_reg(int idx, u32 val)
{
	__raw_writel(val, venc.base + idx);
}

static inline u32 venc_read_reg(int idx)
{
	u32 l = __raw_readl(venc.base + idx);
	return l;
}

static void venc_write_config(const struct venc_config *config)
{
	DSSDBG("write venc conf\n");

	venc_write_reg(VENC_LLEN, config->llen);
	venc_write_reg(VENC_FLENS, config->flens);
	venc_write_reg(VENC_CC_CARR_WSS_CARR, config->cc_carr_wss_carr);
	venc_write_reg(VENC_C_PHASE, config->c_phase);
	venc_write_reg(VENC_GAIN_U, config->gain_u);
	venc_write_reg(VENC_GAIN_V, config->gain_v);
	venc_write_reg(VENC_GAIN_Y, config->gain_y);
	venc_write_reg(VENC_BLACK_LEVEL, config->black_level);
	venc_write_reg(VENC_BLANK_LEVEL, config->blank_level);
	venc_write_reg(VENC_M_CONTROL, config->m_control);
	venc_write_reg(VENC_BSTAMP_WSS_DATA, config->bstamp_wss_data |
			venc.wss_data);
	venc_write_reg(VENC_S_CARR, config->s_carr);
	venc_write_reg(VENC_L21__WC_CTL, config->l21__wc_ctl);
	venc_write_reg(VENC_SAVID__EAVID, config->savid__eavid);
	venc_write_reg(VENC_FLEN__FAL, config->flen__fal);
	venc_write_reg(VENC_LAL__PHASE_RESET, config->lal__phase_reset);
	venc_write_reg(VENC_HS_INT_START_STOP_X, config->hs_int_start_stop_x);
	venc_write_reg(VENC_HS_EXT_START_STOP_X, config->hs_ext_start_stop_x);
	venc_write_reg(VENC_VS_INT_START_X, config->vs_int_start_x);
	venc_write_reg(VENC_VS_INT_STOP_X__VS_INT_START_Y,
		       config->vs_int_stop_x__vs_int_start_y);
	venc_write_reg(VENC_VS_INT_STOP_Y__VS_EXT_START_X,
		       config->vs_int_stop_y__vs_ext_start_x);
	venc_write_reg(VENC_VS_EXT_STOP_X__VS_EXT_START_Y,
		       config->vs_ext_stop_x__vs_ext_start_y);
	venc_write_reg(VENC_VS_EXT_STOP_Y, config->vs_ext_stop_y);
	venc_write_reg(VENC_AVID_START_STOP_X, config->avid_start_stop_x);
	venc_write_reg(VENC_AVID_START_STOP_Y, config->avid_start_stop_y);
	venc_write_reg(VENC_FID_INT_START_X__FID_INT_START_Y,
		       config->fid_int_start_x__fid_int_start_y);
	venc_write_reg(VENC_FID_INT_OFFSET_Y__FID_EXT_START_X,
		       config->fid_int_offset_y__fid_ext_start_x);
	venc_write_reg(VENC_FID_EXT_START_Y__FID_EXT_OFFSET_Y,
		       config->fid_ext_start_y__fid_ext_offset_y);

	venc_write_reg(VENC_DAC_B__DAC_C,  venc_read_reg(VENC_DAC_B__DAC_C));
	venc_write_reg(VENC_VIDOUT_CTRL, config->vidout_ctrl);
	venc_write_reg(VENC_HFLTR_CTRL, config->hfltr_ctrl);
	venc_write_reg(VENC_X_COLOR, config->x_color);
	venc_write_reg(VENC_LINE21, config->line21);
	venc_write_reg(VENC_LN_SEL, config->ln_sel);
	venc_write_reg(VENC_HTRIGGER_VTRIGGER, config->htrigger_vtrigger);
	venc_write_reg(VENC_TVDETGP_INT_START_STOP_X,
		       config->tvdetgp_int_start_stop_x);
	venc_write_reg(VENC_TVDETGP_INT_START_STOP_Y,
		       config->tvdetgp_int_start_stop_y);
	venc_write_reg(VENC_GEN_CTRL, config->gen_ctrl);
	venc_write_reg(VENC_F_CONTROL, config->f_control);
	venc_write_reg(VENC_SYNC_CTRL, config->sync_ctrl);
}

static void venc_reset(void)
{
	int t = 1000;

	venc_write_reg(VENC_F_CONTROL, 1<<8);
	while (venc_read_reg(VENC_F_CONTROL) & (1<<8)) {
		if (--t == 0) {
			DSSERR("Failed to reset venc\n");
			return;
		}
	}

#ifdef CONFIG_FB_OMAP2_DSS_SLEEP_AFTER_VENC_RESET
	/* the magical sleep that makes things work */
	/* XXX more info? What bug this circumvents? */
	msleep(20);
#endif
}

static int venc_runtime_get(void)
{
	int r;

	DSSDBG("venc_runtime_get\n");

	r = pm_runtime_get_sync(&venc.pdev->dev);
	if (WARN_ON(r < 0)) {
		pm_runtime_put_sync(&venc.pdev->dev);
		return r;
	}
	return 0;
}

static void venc_runtime_put(void)
{
	int r;

	DSSDBG("venc_runtime_put\n");

	r = pm_runtime_put_sync(&venc.pdev->dev);
	WARN_ON(r < 0 && r != -ENOSYS);
}

static const struct venc_config *venc_timings_to_config(
		struct omap_video_timings *timings)
{
	if (memcmp(&omap_dss_pal_timings, timings, sizeof(*timings)) == 0)
		return &venc_config_pal_trm;

	if (memcmp(&omap_dss_ntsc_timings, timings, sizeof(*timings)) == 0)
		return &venc_config_ntsc_trm;

	BUG();
	return NULL;
}

static int venc_power_on(struct omap_dss_device *dssdev)
{
	struct omap_overlay_manager *mgr = venc.output.manager;
	u32 l;
	int r;

	r = venc_runtime_get();
	if (r)
		goto err0;

	venc_reset();
	venc_write_config(venc_timings_to_config(&venc.timings));

	dss_set_venc_output(venc.type);
	dss_set_dac_pwrdn_bgz(1);

	l = 0;

	if (venc.type == OMAP_DSS_VENC_TYPE_COMPOSITE)
		l |= 1 << 1;
	else /* S-Video */
		l |= (1 << 0) | (1 << 2);

	if (venc.invert_polarity == false)
		l |= 1 << 3;

	venc_write_reg(VENC_OUTPUT_CONTROL, l);

	dss_mgr_set_timings(mgr, &venc.timings);

	r = regulator_enable(venc.vdda_dac_reg);
	if (r)
		goto err1;

	r = dss_mgr_enable(mgr);
	if (r)
		goto err2;

	return 0;

err2:
	regulator_disable(venc.vdda_dac_reg);
err1:
	venc_write_reg(VENC_OUTPUT_CONTROL, 0);
	dss_set_dac_pwrdn_bgz(0);

	venc_runtime_put();
err0:
	return r;
}

static void venc_power_off(struct omap_dss_device *dssdev)
{
	struct omap_overlay_manager *mgr = venc.output.manager;

	venc_write_reg(VENC_OUTPUT_CONTROL, 0);
	dss_set_dac_pwrdn_bgz(0);

	dss_mgr_disable(mgr);

	regulator_disable(venc.vdda_dac_reg);

	venc_runtime_put();
}

static int venc_display_enable(struct omap_dss_device *dssdev)
{
	struct omap_dss_device *out = &venc.output;
	int r;

	DSSDBG("venc_display_enable\n");

	mutex_lock(&venc.venc_lock);

	if (out->manager == NULL) {
		DSSERR("Failed to enable display: no output/manager\n");
		r = -ENODEV;
		goto err0;
	}

	r = venc_power_on(dssdev);
	if (r)
		goto err0;

	venc.wss_data = 0;

	mutex_unlock(&venc.venc_lock);

	return 0;
err0:
	mutex_unlock(&venc.venc_lock);
	return r;
}

static void venc_display_disable(struct omap_dss_device *dssdev)
{
	DSSDBG("venc_display_disable\n");

	mutex_lock(&venc.venc_lock);

	venc_power_off(dssdev);

	mutex_unlock(&venc.venc_lock);
}

static void venc_set_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	DSSDBG("venc_set_timings\n");

	mutex_lock(&venc.venc_lock);

	/* Reset WSS data when the TV standard changes. */
	if (memcmp(&venc.timings, timings, sizeof(*timings)))
		venc.wss_data = 0;

	venc.timings = *timings;

	dispc_set_tv_pclk(13500000);

	mutex_unlock(&venc.venc_lock);
}

static int venc_check_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	DSSDBG("venc_check_timings\n");

	if (memcmp(&omap_dss_pal_timings, timings, sizeof(*timings)) == 0)
		return 0;

	if (memcmp(&omap_dss_ntsc_timings, timings, sizeof(*timings)) == 0)
		return 0;

	return -EINVAL;
}

static void venc_get_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	mutex_lock(&venc.venc_lock);

	*timings = venc.timings;

	mutex_unlock(&venc.venc_lock);
}

static u32 venc_get_wss(struct omap_dss_device *dssdev)
{
	/* Invert due to VENC_L21_WC_CTL:INV=1 */
	return (venc.wss_data >> 8) ^ 0xfffff;
}

static int venc_set_wss(struct omap_dss_device *dssdev, u32 wss)
{
	const struct venc_config *config;
	int r;

	DSSDBG("venc_set_wss\n");

	mutex_lock(&venc.venc_lock);

	config = venc_timings_to_config(&venc.timings);

	/* Invert due to VENC_L21_WC_CTL:INV=1 */
	venc.wss_data = (wss ^ 0xfffff) << 8;

	r = venc_runtime_get();
	if (r)
		goto err;

	venc_write_reg(VENC_BSTAMP_WSS_DATA, config->bstamp_wss_data |
			venc.wss_data);

	venc_runtime_put();

err:
	mutex_unlock(&venc.venc_lock);

	return r;
}

static void venc_set_type(struct omap_dss_device *dssdev,
		enum omap_dss_venc_type type)
{
	mutex_lock(&venc.venc_lock);

	venc.type = type;

	mutex_unlock(&venc.venc_lock);
}

static void venc_invert_vid_out_polarity(struct omap_dss_device *dssdev,
		bool invert_polarity)
{
	mutex_lock(&venc.venc_lock);

	venc.invert_polarity = invert_polarity;

	mutex_unlock(&venc.venc_lock);
}

static int venc_init_regulator(void)
{
	struct regulator *vdda_dac;

	if (venc.vdda_dac_reg != NULL)
		return 0;

	if (venc.pdev->dev.of_node)
		vdda_dac = devm_regulator_get(&venc.pdev->dev, "vdda");
	else
		vdda_dac = devm_regulator_get(&venc.pdev->dev, "vdda_dac");

	if (IS_ERR(vdda_dac)) {
		if (PTR_ERR(vdda_dac) != -EPROBE_DEFER)
			DSSERR("can't get VDDA_DAC regulator\n");
		return PTR_ERR(vdda_dac);
	}

	venc.vdda_dac_reg = vdda_dac;

	return 0;
}

static void venc_dump_regs(struct seq_file *s)
{
#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, venc_read_reg(r))

	if (venc_runtime_get())
		return;

	DUMPREG(VENC_F_CONTROL);
	DUMPREG(VENC_VIDOUT_CTRL);
	DUMPREG(VENC_SYNC_CTRL);
	DUMPREG(VENC_LLEN);
	DUMPREG(VENC_FLENS);
	DUMPREG(VENC_HFLTR_CTRL);
	DUMPREG(VENC_CC_CARR_WSS_CARR);
	DUMPREG(VENC_C_PHASE);
	DUMPREG(VENC_GAIN_U);
	DUMPREG(VENC_GAIN_V);
	DUMPREG(VENC_GAIN_Y);
	DUMPREG(VENC_BLACK_LEVEL);
	DUMPREG(VENC_BLANK_LEVEL);
	DUMPREG(VENC_X_COLOR);
	DUMPREG(VENC_M_CONTROL);
	DUMPREG(VENC_BSTAMP_WSS_DATA);
	DUMPREG(VENC_S_CARR);
	DUMPREG(VENC_LINE21);
	DUMPREG(VENC_LN_SEL);
	DUMPREG(VENC_L21__WC_CTL);
	DUMPREG(VENC_HTRIGGER_VTRIGGER);
	DUMPREG(VENC_SAVID__EAVID);
	DUMPREG(VENC_FLEN__FAL);
	DUMPREG(VENC_LAL__PHASE_RESET);
	DUMPREG(VENC_HS_INT_START_STOP_X);
	DUMPREG(VENC_HS_EXT_START_STOP_X);
	DUMPREG(VENC_VS_INT_START_X);
	DUMPREG(VENC_VS_INT_STOP_X__VS_INT_START_Y);
	DUMPREG(VENC_VS_INT_STOP_Y__VS_EXT_START_X);
	DUMPREG(VENC_VS_EXT_STOP_X__VS_EXT_START_Y);
	DUMPREG(VENC_VS_EXT_STOP_Y);
	DUMPREG(VENC_AVID_START_STOP_X);
	DUMPREG(VENC_AVID_START_STOP_Y);
	DUMPREG(VENC_FID_INT_START_X__FID_INT_START_Y);
	DUMPREG(VENC_FID_INT_OFFSET_Y__FID_EXT_START_X);
	DUMPREG(VENC_FID_EXT_START_Y__FID_EXT_OFFSET_Y);
	DUMPREG(VENC_TVDETGP_INT_START_STOP_X);
	DUMPREG(VENC_TVDETGP_INT_START_STOP_Y);
	DUMPREG(VENC_GEN_CTRL);
	DUMPREG(VENC_OUTPUT_CONTROL);
	DUMPREG(VENC_OUTPUT_TEST);

	venc_runtime_put();

#undef DUMPREG
}

static int venc_get_clocks(struct platform_device *pdev)
{
	struct clk *clk;

	if (dss_has_feature(FEAT_VENC_REQUIRES_TV_DAC_CLK)) {
		clk = devm_clk_get(&pdev->dev, "tv_dac_clk");
		if (IS_ERR(clk)) {
			DSSERR("can't get tv_dac_clk\n");
			return PTR_ERR(clk);
		}
	} else {
		clk = NULL;
	}

	venc.tv_dac_clk = clk;

	return 0;
}

static int venc_connect(struct omap_dss_device *dssdev,
		struct omap_dss_device *dst)
{
	struct omap_overlay_manager *mgr;
	int r;

	r = venc_init_regulator();
	if (r)
		return r;

	mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel);
	if (!mgr)
		return -ENODEV;

	r = dss_mgr_connect(mgr, dssdev);
	if (r)
		return r;

	r = omapdss_output_set_device(dssdev, dst);
	if (r) {
		DSSERR("failed to connect output to new device: %s\n",
				dst->name);
		dss_mgr_disconnect(mgr, dssdev);
		return r;
	}

	return 0;
}

static void venc_disconnect(struct omap_dss_device *dssdev,
		struct omap_dss_device *dst)
{
	WARN_ON(dst != dssdev->dst);

	if (dst != dssdev->dst)
		return;

	omapdss_output_unset_device(dssdev);

	if (dssdev->manager)
		dss_mgr_disconnect(dssdev->manager, dssdev);
}

static const struct omapdss_atv_ops venc_ops = {
	.connect = venc_connect,
	.disconnect = venc_disconnect,

	.enable = venc_display_enable,
	.disable = venc_display_disable,

	.check_timings = venc_check_timings,
	.set_timings = venc_set_timings,
	.get_timings = venc_get_timings,

	.set_type = venc_set_type,
	.invert_vid_out_polarity = venc_invert_vid_out_polarity,

	.set_wss = venc_set_wss,
	.get_wss = venc_get_wss,
};

static void venc_init_output(struct platform_device *pdev)
{
	struct omap_dss_device *out = &venc.output;

	out->dev = &pdev->dev;
	out->id = OMAP_DSS_OUTPUT_VENC;
	out->output_type = OMAP_DISPLAY_TYPE_VENC;
	out->name = "venc.0";
	out->dispc_channel = OMAP_DSS_CHANNEL_DIGIT;
	out->ops.atv = &venc_ops;
	out->owner = THIS_MODULE;

	omapdss_register_output(out);
}

static void venc_uninit_output(struct platform_device *pdev)
{
	struct omap_dss_device *out = &venc.output;

	omapdss_unregister_output(out);
}

static int venc_probe_of(struct platform_device *pdev)
{
	struct device_node *node = pdev->dev.of_node;
	struct device_node *ep;
	u32 channels;
	int r;

	ep = omapdss_of_get_first_endpoint(node);
	if (!ep)
		return 0;

	venc.invert_polarity = of_property_read_bool(ep, "ti,invert-polarity");

	r = of_property_read_u32(ep, "ti,channels", &channels);
	if (r) {
		dev_err(&pdev->dev,
			"failed to read property 'ti,channels': %d\n", r);
		goto err;
	}

	switch (channels) {
	case 1:
		venc.type = OMAP_DSS_VENC_TYPE_COMPOSITE;
		break;
	case 2:
		venc.type = OMAP_DSS_VENC_TYPE_SVIDEO;
		break;
	default:
		dev_err(&pdev->dev, "bad channel property '%d'\n", channels);
		r = -EINVAL;
		goto err;
	}

	of_node_put(ep);

	return 0;
err:
	of_node_put(ep);

	return 0;
}

/* VENC HW IP initialisation */
static int venc_bind(struct device *dev, struct device *master, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	u8 rev_id;
	struct resource *venc_mem;
	int r;

	venc.pdev = pdev;

	mutex_init(&venc.venc_lock);

	venc.wss_data = 0;

	venc_mem = platform_get_resource(venc.pdev, IORESOURCE_MEM, 0);
	if (!venc_mem) {
		DSSERR("can't get IORESOURCE_MEM VENC\n");
		return -EINVAL;
	}

	venc.base = devm_ioremap(&pdev->dev, venc_mem->start,
				 resource_size(venc_mem));
	if (!venc.base) {
		DSSERR("can't ioremap VENC\n");
		return -ENOMEM;
	}

	r = venc_get_clocks(pdev);
	if (r)
		return r;

	pm_runtime_enable(&pdev->dev);

	r = venc_runtime_get();
	if (r)
		goto err_runtime_get;

	rev_id = (u8)(venc_read_reg(VENC_REV_ID) & 0xff);
	dev_dbg(&pdev->dev, "OMAP VENC rev %d\n", rev_id);

	venc_runtime_put();

	if (pdev->dev.of_node) {
		r = venc_probe_of(pdev);
		if (r) {
			DSSERR("Invalid DT data\n");
			goto err_probe_of;
		}
	}

	dss_debugfs_create_file("venc", venc_dump_regs);

	venc_init_output(pdev);

	return 0;

err_probe_of:
err_runtime_get:
	pm_runtime_disable(&pdev->dev);
	return r;
}

static void venc_unbind(struct device *dev, struct device *master, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);

	venc_uninit_output(pdev);

	pm_runtime_disable(&pdev->dev);
}

static const struct component_ops venc_component_ops = {
	.bind	= venc_bind,
	.unbind	= venc_unbind,
};

static int venc_probe(struct platform_device *pdev)
{
	return component_add(&pdev->dev, &venc_component_ops);
}

static int venc_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &venc_component_ops);
	return 0;
}

static int venc_runtime_suspend(struct device *dev)
{
	if (venc.tv_dac_clk)
		clk_disable_unprepare(venc.tv_dac_clk);

	dispc_runtime_put();

	return 0;
}

static int venc_runtime_resume(struct device *dev)
{
	int r;

	r = dispc_runtime_get();
	if (r < 0)
		return r;

	if (venc.tv_dac_clk)
		clk_prepare_enable(venc.tv_dac_clk);

	return 0;
}

static const struct dev_pm_ops venc_pm_ops = {
	.runtime_suspend = venc_runtime_suspend,
	.runtime_resume = venc_runtime_resume,
};

static const struct of_device_id venc_of_match[] = {
	{ .compatible = "ti,omap2-venc", },
	{ .compatible = "ti,omap3-venc", },
	{ .compatible = "ti,omap4-venc", },
	{},
};

static struct platform_driver omap_venchw_driver = {
	.probe		= venc_probe,
	.remove		= venc_remove,
	.driver         = {
		.name   = "omapdss_venc",
		.pm	= &venc_pm_ops,
		.of_match_table = venc_of_match,
		.suppress_bind_attrs = true,
	},
};

int __init venc_init_platform_driver(void)
{
	return platform_driver_register(&omap_venchw_driver);
}

void venc_uninit_platform_driver(void)
{
	platform_driver_unregister(&omap_venchw_driver);
}