ivtv-yuv.c

trident tm5600的linux驱动

	reg_2964_base = (src_minor_y * ((f->dst_h << 16) / f->src_h)) >> 14;
	reg_2968_base = (src_minor_uv * ((f->dst_h << 16) / f->src_h)) >> 14;

	if (f->dst_h / 2 >= f->src_h && !f->interlaced_y) {
		master_height = (f->src_h * 0x00400000) / f->dst_h;
		if ((f->src_h * 0x00400000) - (master_height * f->dst_h) >= f->dst_h / 2)
			master_height++;
		reg_2920 = master_height >> 2;
		reg_2928 = master_height >> 3;
		reg_2930 = master_height;
		reg_2940 = master_height >> 1;
		reg_2964_base >>= 3;
		reg_2968_base >>= 3;
		reg_296c = 0x00000000;
	} else if (f->dst_h >= f->src_h) {
		master_height = (f->src_h * 0x00400000) / f->dst_h;
		master_height = (master_height >> 1) + (master_height & 1);
		reg_2920 = master_height >> 2;
		reg_2928 = master_height >> 2;
		reg_2930 = master_height;
		reg_2940 = master_height >> 1;
		reg_296c = 0x00000000;
		if (f->interlaced_y) {
			reg_2964_base >>= 3;
		} else {
			reg_296c++;
			reg_2964_base >>= 2;
		}
		if (f->interlaced_uv)
			reg_2928 >>= 1;
		reg_2968_base >>= 3;
	} else if (f->dst_h >= f->src_h / 2) {
		master_height = (f->src_h * 0x00200000) / f->dst_h;
		master_height = (master_height >> 1) + (master_height & 1);
		reg_2920 = master_height >> 2;
		reg_2928 = master_height >> 2;
		reg_2930 = master_height;
		reg_2940 = master_height;
		reg_296c = 0x00000101;
		if (f->interlaced_y) {
			reg_2964_base >>= 2;
		} else {
			reg_296c++;
			reg_2964_base >>= 1;
		}
		if (f->interlaced_uv)
			reg_2928 >>= 1;
		reg_2968_base >>= 2;
	} else {
		master_height = (f->src_h * 0x00100000) / f->dst_h;
		master_height = (master_height >> 1) + (master_height & 1);
		reg_2920 = master_height >> 2;
		reg_2928 = master_height >> 2;
		reg_2930 = master_height;
		reg_2940 = master_height;
		reg_2964_base >>= 1;
		reg_2968_base >>= 2;
		reg_296c = 0x00000102;
	}

	/* FIXME These registers change depending on scaled / unscaled output
	   We really need to work out what they should be */
	if (f->src_h == f->dst_h) {
		reg_2934 = 0x00020000;
		reg_293c = 0x00100000;
		reg_2944 = 0x00040000;
		reg_294c = 0x000b0000;
	} else {
		reg_2934 = 0x00000FF0;
		reg_293c = 0x00000FF0;
		reg_2944 = 0x00000FF0;
		reg_294c = 0x00000FF0;
	}

	/* The first line to be displayed */
	reg_2950 = 0x00010000 + src_major_y;
	if (f->interlaced_y)
		reg_2950 += 0x00010000;
	reg_2954 = reg_2950 + 1;

	reg_2958 = 0x00010000 + (src_major_y >> 1);
	if (f->interlaced_uv)
		reg_2958 += 0x00010000;
	reg_295c = reg_2958 + 1;

	if (yi->decode_height == 480)
		reg_289c = 0x011e0017;
	else
		reg_289c = 0x01500017;

	if (f->dst_y < 0)
		reg_289c = (reg_289c - ((f->dst_y & ~1)<<15))-(f->dst_y >>1);
	else
		reg_289c = (reg_289c + ((f->dst_y & ~1)<<15))+(f->dst_y >>1);

	/* How much of the source to decode.
	   Take into account the source offset */
	reg_2960 = ((src_minor_y + f->src_h + src_major_y) - 1) |
		(((src_minor_uv + f->src_h + src_major_uv - 1) & ~1) << 15);

	/* Calculate correct value for register 2964 */
	if (f->src_h == f->dst_h) {
		reg_2964 = 1;
	} else {
		reg_2964 = 2 + ((f->dst_h << 1) / f->src_h);
		reg_2964 = (reg_2964 >> 1) + (reg_2964 & 1);
	}
	reg_2968 = (reg_2964 << 16) + reg_2964 + (reg_2964 >> 1);
	reg_2964 = (reg_2964 << 16) + reg_2964 + (reg_2964 * 46 / 94);

	/* Okay, we've wasted time working out the correct value,
	   but if we use it, it fouls the the window alignment.
	   Fudge it to what we want... */
	reg_2964 = 0x00010001 + ((reg_2964 & 0x0000FFFF) - (reg_2964 >> 16));
	reg_2968 = 0x00010001 + ((reg_2968 & 0x0000FFFF) - (reg_2968 >> 16));

	/* Deviate further from what it should be. I find the flicker headache
	   inducing so try to reduce it slightly. Leave 2968 as-is otherwise
	   colours foul. */
	if ((reg_2964 != 0x00010001) && (f->dst_h / 2 <= f->src_h))
		reg_2964 = (reg_2964 & 0xFFFF0000) + ((reg_2964 & 0x0000FFFF) / 2);

	if (!f->interlaced_y)
		reg_2964 -= 0x00010001;
	if (!f->interlaced_uv)
		reg_2968 -= 0x00010001;

	reg_2964 += ((reg_2964_base << 16) | reg_2964_base);
	reg_2968 += ((reg_2968_base << 16) | reg_2968_base);

	/* Select the vertical filter */
	if (f->src_h == f->dst_h) {
		/* An exact size match uses filter 0/1 */
		v_filter_1 = 0;
		v_filter_2 = 1;
	} else {
		/* Figure out which filter to use */
		v_filter_1 = ((f->src_h << 16) / f->dst_h) >> 15;
		v_filter_1 = (v_filter_1 >> 1) + (v_filter_1 & 1);
		/* Only an exact size match can use filter 0 */
		v_filter_1 += !v_filter_1;
		v_filter_2 = v_filter_1;
	}

	write_reg(reg_2934, 0x02934);
	write_reg(reg_293c, 0x0293c);
	IVTV_DEBUG_YUV("Update reg 0x2934 %08x->%08x 0x293c %08x->%08x\n",
		       yi->reg_2934, reg_2934, yi->reg_293c, reg_293c);
	write_reg(reg_2944, 0x02944);
	write_reg(reg_294c, 0x0294c);
	IVTV_DEBUG_YUV("Update reg 0x2944 %08x->%08x 0x294c %08x->%08x\n",
		       yi->reg_2944, reg_2944, yi->reg_294c, reg_294c);

	/* Ensure 2970 is 0 (does it ever change ?) */
/*	write_reg(0,0x02970); */
/*	IVTV_DEBUG_YUV("Update reg 0x2970 %08x->%08x\n", yi->reg_2970, 0); */

	write_reg(reg_2930, 0x02938);
	write_reg(reg_2930, 0x02930);
	IVTV_DEBUG_YUV("Update reg 0x2930 %08x->%08x 0x2938 %08x->%08x\n",
		       yi->reg_2930, reg_2930, yi->reg_2938, reg_2930);

	write_reg(reg_2928, 0x02928);
	write_reg(reg_2928 + 0x514, 0x0292C);
	IVTV_DEBUG_YUV("Update reg 0x2928 %08x->%08x 0x292c %08x->%08x\n",
		       yi->reg_2928, reg_2928, yi->reg_292c, reg_2928 + 0x514);

	write_reg(reg_2920, 0x02920);
	write_reg(reg_2920 + 0x514, 0x02924);
	IVTV_DEBUG_YUV("Update reg 0x2920 %08x->%08x 0x2924 %08x->%08x\n",
		       yi->reg_2920, reg_2920, yi->reg_2924, reg_2920 + 0x514);

	write_reg(reg_2918, 0x02918);
	write_reg(reg_291c, 0x0291C);
	IVTV_DEBUG_YUV("Update reg 0x2918 %08x->%08x 0x291C %08x->%08x\n",
		       yi->reg_2918, reg_2918, yi->reg_291c, reg_291c);

	write_reg(reg_296c, 0x0296c);
	IVTV_DEBUG_YUV("Update reg 0x296c %08x->%08x\n",
		       yi->reg_296c, reg_296c);

	write_reg(reg_2940, 0x02948);
	write_reg(reg_2940, 0x02940);
	IVTV_DEBUG_YUV("Update reg 0x2940 %08x->%08x 0x2948 %08x->%08x\n",
		       yi->reg_2940, reg_2940, yi->reg_2948, reg_2940);

	write_reg(reg_2950, 0x02950);
	write_reg(reg_2954, 0x02954);
	IVTV_DEBUG_YUV("Update reg 0x2950 %08x->%08x 0x2954 %08x->%08x\n",
		       yi->reg_2950, reg_2950, yi->reg_2954, reg_2954);

	write_reg(reg_2958, 0x02958);
	write_reg(reg_295c, 0x0295C);
	IVTV_DEBUG_YUV("Update reg 0x2958 %08x->%08x 0x295C %08x->%08x\n",
		       yi->reg_2958, reg_2958, yi->reg_295c, reg_295c);

	write_reg(reg_2960, 0x02960);
	IVTV_DEBUG_YUV("Update reg 0x2960 %08x->%08x \n",
		       yi->reg_2960, reg_2960);

	write_reg(reg_2964, 0x02964);
	write_reg(reg_2968, 0x02968);
	IVTV_DEBUG_YUV("Update reg 0x2964 %08x->%08x 0x2968 %08x->%08x\n",
		       yi->reg_2964, reg_2964, yi->reg_2968, reg_2968);

	write_reg(reg_289c, 0x0289c);
	IVTV_DEBUG_YUV("Update reg 0x289c %08x->%08x\n",
		       yi->reg_289c, reg_289c);

	/* Only update filter 1 if we really need to */
	if (v_filter_1 != yi->v_filter_1) {
		ivtv_yuv_filter(itv, -1, v_filter_1, -1);
		yi->v_filter_1 = v_filter_1;
	}

	/* Only update filter 2 if we really need to */
	if (v_filter_2 != yi->v_filter_2) {
		ivtv_yuv_filter(itv, -1, -1, v_filter_2);
		yi->v_filter_2 = v_filter_2;
	}
}

/* Modify the supplied coordinate information to fit the visible osd area */
static u32 ivtv_yuv_window_setup(struct ivtv *itv, struct yuv_frame_info *f)
{
	struct yuv_frame_info *of = &itv->yuv_info.old_frame_info;
	int osd_crop;
	u32 osd_scale;
	u32 yuv_update = 0;

	/* Sorry, but no negative coords for src */
	if (f->src_x < 0)
		f->src_x = 0;
	if (f->src_y < 0)
		f->src_y = 0;

	/* Can only reduce width down to 1/4 original size */
	if ((osd_crop = f->src_w - 4 * f->dst_w) > 0) {
		f->src_x += osd_crop / 2;
		f->src_w = (f->src_w - osd_crop) & ~3;
		f->dst_w = f->src_w / 4;
		f->dst_w += f->dst_w & 1;
	}

	/* Can only reduce height down to 1/4 original size */
	if (f->src_h / f->dst_h >= 2) {
		/* Overflow may be because we're running progressive,
		   so force mode switch */
		f->interlaced_y = 1;
		/* Make sure we're still within limits for interlace */
		if ((osd_crop = f->src_h - 4 * f->dst_h) > 0) {
			/* If we reach here we'll have to force the height. */
			f->src_y += osd_crop / 2;
			f->src_h = (f->src_h - osd_crop) & ~3;
			f->dst_h = f->src_h / 4;
			f->dst_h += f->dst_h & 1;
		}
	}

	/* If there's nothing to safe to display, we may as well stop now */
	if ((int)f->dst_w <= 2 || (int)f->dst_h <= 2 ||
	    (int)f->src_w <= 2 || (int)f->src_h <= 2) {
		return IVTV_YUV_UPDATE_INVALID;
	}

	/* Ensure video remains inside OSD area */
	osd_scale = (f->src_h << 16) / f->dst_h;

	if ((osd_crop = f->pan_y - f->dst_y) > 0) {
		/* Falls off the upper edge - crop */
		f->src_y += (osd_scale * osd_crop) >> 16;
		f->src_h -= (osd_scale * osd_crop) >> 16;
		f->dst_h -= osd_crop;
		f->dst_y = 0;
	} else {
		f->dst_y -= f->pan_y;
	}

	if ((osd_crop = f->dst_h + f->dst_y - f->vis_h) > 0) {
		/* Falls off the lower edge - crop */
		f->dst_h -= osd_crop;
		f->src_h -= (osd_scale * osd_crop) >> 16;
	}

	osd_scale = (f->src_w << 16) / f->dst_w;

	if ((osd_crop = f->pan_x - f->dst_x) > 0) {
		/* Fall off the left edge - crop */
		f->src_x += (osd_scale * osd_crop) >> 16;
		f->src_w -= (osd_scale * osd_crop) >> 16;
		f->dst_w -= osd_crop;
		f->dst_x = 0;
	} else {
		f->dst_x -= f->pan_x;
	}

	if ((osd_crop = f->dst_w + f->dst_x - f->vis_w) > 0) {
		/* Falls off the right edge - crop */
		f->dst_w -= osd_crop;
		f->src_w -= (osd_scale * osd_crop) >> 16;
	}

	if (itv->yuv_info.track_osd) {
		/* The OSD can be moved. Track to it */
		f->dst_x += itv->yuv_info.osd_x_offset;
		f->dst_y += itv->yuv_info.osd_y_offset;
	}

	/* Width & height for both src & dst must be even.
	   Same for coordinates. */
	f->dst_w &= ~1;
	f->dst_x &= ~1;

	f->src_w += f->src_x & 1;
	f->src_x &= ~1;

	f->src_w &= ~1;
	f->dst_w &= ~1;

	f->dst_h &= ~1;
	f->dst_y &= ~1;

	f->src_h += f->src_y & 1;
	f->src_y &= ~1;

	f->src_h &= ~1;
	f->dst_h &= ~1;

	/* Due to rounding, we may have reduced the output size to <1/4 of
	   the source. Check again, but this time just resize. Don't change
	   source coordinates */
	if (f->dst_w < f->src_w / 4) {
		f->src_w &= ~3;
		f->dst_w = f->src_w / 4;
		f->dst_w += f->dst_w & 1;
	}
	if (f->dst_h < f->src_h / 4) {
		f->src_h &= ~3;
		f->dst_h = f->src_h / 4;
		f->dst_h += f->dst_h & 1;
	}

	/* Check again. If there's nothing to safe to display, stop now */
	if ((int)f->dst_w <= 2 || (int)f->dst_h <= 2 ||
	    (int)f->src_w <= 2 || (int)f->src_h <= 2) {
		return IVTV_YUV_UPDATE_INVALID;
	}

	/* Both x offset & width are linked, so they have to be done together */
	if ((of->dst_w != f->dst_w) || (of->src_w != f->src_w) ||
	    (of->dst_x != f->dst_x) || (of->src_x != f->src_x) ||
	    (of->pan_x != f->pan_x) || (of->vis_w != f->vis_w)) {
		yuv_update |= IVTV_YUV_UPDATE_HORIZONTAL;
	}

	if ((of->src_h != f->src_h) || (of->dst_h != f->dst_h) ||
	    (of->dst_y != f->dst_y) || (of->src_y != f->src_y) ||
	    (of->pan_y != f->pan_y) || (of->vis_h != f->vis_h) ||
	    (of->lace_mode != f->lace_mode) ||
	    (of->interlaced_y != f->interlaced_y) ||
	    (of->interlaced_uv != f->interlaced_uv)) {
		yuv_update |= IVTV_YUV_UPDATE_VERTICAL;
	}

	return yuv_update;
}

/* Update the scaling register to the requested value */
void ivtv_yuv_work_handler(struct ivtv *itv)
{
	struct yuv_playback_info *yi = &itv->yuv_info;
	struct yuv_frame_info f;
	int frame = yi->update_frame;
	u32 yuv_update;

	IVTV_DEBUG_YUV("Update yuv registers for frame %d\n", frame);
	f = yi->new_frame_info[frame];

	if (yi->track_osd) {
		/* Snapshot the osd pan info */
		f.pan_x = yi->osd_x_pan;
		f.pan_y = yi->osd_y_pan;
		f.vis_w = yi->osd_vis_w;
		f.vis_h = yi->osd_vis_h;
	} else {
		/* Not tracking the osd, so assume full screen */
		f.pan_x = 0;
		f.pan_y = 0;
		f.vis_w = 720;
		f.vis_h = yi->decode_height;
	}

	/* Calculate the display window coordinates. Exit if nothing left */
	if (!(yuv_update = ivtv_yuv_window_setup(itv, &f)))
		return;

	if (yuv_update & IVTV_YUV_UPDATE_INVALID) {
		write_reg(0x01008080, 0x2898);
	} else if (yuv_update) {
		write_reg(0x00108080, 0x2898);

		if (yuv_update & IVTV_YUV_UPDATE_HORIZONTAL)
			ivtv_yuv_handle_horizontal(itv, &f);

		if (yuv_update & IVTV_YUV_UPDATE_VERTICAL)
			ivtv_yuv_handle_vertical(itv, &f);
	}
	yi->old_frame_info = f;
}

static void ivtv_yuv_init(struct ivtv *itv)
{
	struct yuv_playback_info *yi = &itv->yuv_info;

	IVTV_DEBUG_YUV("ivtv_yuv_init\n");

	/* Take a snapshot of the current register settings */
	yi->reg_2834 = read_reg(0x02834);