Commit 53b50314 authored by Damian Hobson-Garcia's avatar Damian Hobson-Garcia Committed by Paul Mundt
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fbdev: sh_mobile_lcdc: Add YUV framebuffer support 



Supports YCbCr420sp, YCbCr422sp, and YCbCr44sp, formats
(bpp = 12, 16, and 24) respectively.

When double-buffering both Y planes appear before the C planes (Y-Y-C-C),
as opposed to  Y-C-Y-C.

Set .nonstd in struct sh_mobile_lcdc_chan_cfg to enable YUV mode, and use
.bpp to distiguish between the 3 modes.
The value of .nonstd is copied to bits 16-31 of LDDFR in the LCDC and
should be set accordingly.
.nonstd must be set to 0 for RGB mode.

Due to the encoding of YUV data, the framebuffer will clear to green
instead of black.

In YUV 420 mode, panning is only possible in 2 line increments.
Additionally in YUV 420 mode the vertical resolution of the framebuffer
must be an even number.

Signed-off-by: default avatarDamian Hobson-Garcia <dhobsong@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 3b0fd9d7

drivers/video/sh_mobile_lcdcfb.c

+113 −28
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = { 
	[LDSM1R] = 0x428,

	[LDSM2R] = 0x42c,

	[LDSA1R] = 0x430,

	[LDSA2R] = 0x434,

	[LDMLSR] = 0x438,

	[LDHCNR] = 0x448,

	[LDHSYNR] = 0x44c,
@@ -153,6 +154,7 @@ static bool banked(int reg_nr) 
	case LDDFR:

	case LDSM1R:

	case LDSA1R:

	case LDSA2R:

	case LDMLSR:

	case LDHCNR:

	case LDHSYNR:
@@ -465,6 +467,7 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) 
	struct sh_mobile_lcdc_board_cfg	*board_cfg;

	unsigned long tmp;

	int bpp = 0;

	unsigned long ldddsr;

	int k, m;

	int ret = 0;
@@ -543,17 +546,22 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) 
	}



	/* word and long word swap */

	ldddsr = lcdc_read(priv, _LDDDSR);

	if  (priv->ch[0].info->var.nonstd)

		lcdc_write(priv, _LDDDSR, ldddsr | 7);

	else {

		switch (bpp) {

		case 16:

		lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);

			lcdc_write(priv, _LDDDSR, ldddsr | 6);

			break;

		case 24:

		lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 7);

			lcdc_write(priv, _LDDDSR, ldddsr | 7);

			break;

		case 32:

		lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 4);

			lcdc_write(priv, _LDDDSR, ldddsr | 4);

			break;

		}

	}



	for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {

		ch = &priv->ch[k];
@@ -563,7 +571,20 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) 


		/* set bpp format in PKF[4:0] */

		tmp = lcdc_read_chan(ch, LDDFR);

		tmp &= ~0x0001001f;

		tmp &= ~0x0003031f;

		if (ch->info->var.nonstd) {

			tmp |= (ch->info->var.nonstd << 16);

			switch (ch->info->var.bits_per_pixel) {

			case 12:

				break;

			case 16:

				tmp |= (0x1 << 8);

				break;

			case 24:

				tmp |= (0x2 << 8);

				break;

			}

		} else {

			switch (ch->info->var.bits_per_pixel) {

			case 16:

				tmp |= 0x03;
@@ -574,10 +595,16 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) 
			case 32:

				break;

			}

		}

		lcdc_write_chan(ch, LDDFR, tmp);



		/* point out our frame buffer */

		lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);

		if (ch->info->var.nonstd)

			lcdc_write_chan(ch, LDSA2R,

				ch->info->fix.smem_start +

				ch->info->var.xres *

				ch->info->var.yres_virtual);



		/* set line size */

		lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
@@ -816,9 +843,15 @@ static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var, 
	struct sh_mobile_lcdc_priv *priv = ch->lcdc;

	unsigned long ldrcntr;

	unsigned long new_pan_offset;

	unsigned long base_addr_y, base_addr_c;

	unsigned long c_offset;



	if (!var->nonstd)

		new_pan_offset = (var->yoffset * info->fix.line_length) +

			(var->xoffset * (info->var.bits_per_pixel / 8));

	else

		new_pan_offset = (var->yoffset * info->fix.line_length) +

			(var->xoffset);



	if (new_pan_offset == ch->pan_offset)

		return 0;	/* No change, do nothing */
@@ -826,7 +859,26 @@ static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var, 
	ldrcntr = lcdc_read(priv, _LDRCNTR);



	/* Set the source address for the next refresh */

	lcdc_write_chan_mirror(ch, LDSA1R, ch->dma_handle + new_pan_offset);

	base_addr_y = ch->dma_handle + new_pan_offset;

	if (var->nonstd) {

		/* Set y offset */

		c_offset = (var->yoffset *

			info->fix.line_length *

			(info->var.bits_per_pixel - 8)) / 8;

		base_addr_c = ch->dma_handle + var->xres * var->yres_virtual +

			c_offset;

		/* Set x offset */

		if (info->var.bits_per_pixel == 24)

			base_addr_c += 2 * var->xoffset;

		else

			base_addr_c += var->xoffset;

	} else

		base_addr_c = 0;



	lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);

	if (base_addr_c)

		lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);



	if (lcdc_chan_is_sublcd(ch))

		lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);

	else
@@ -897,6 +949,9 @@ static void sh_mobile_fb_reconfig(struct fb_info *info) 
		/* Couldn't reconfigure, hopefully, can continue as before */

		return;



	if (info->var.nonstd)

		info->fix.line_length = mode1.xres;

	else

		info->fix.line_length = mode1.xres * (ch->cfg.bpp / 8);



	/*
@@ -1050,8 +1105,22 @@ static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev) 
	backlight_device_unregister(bdev);

}



static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)

static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp,

				   int nonstd)

{

	if (nonstd) {

		switch (bpp) {

		case 12:

		case 16:

		case 24:

			var->bits_per_pixel = bpp;

			var->nonstd = nonstd;

			return 0;

		default:

			return -EINVAL;

		}

	}



	switch (bpp) {

	case 16: /* PKF[4:0] = 00011 - RGB 565 */

		var->red.offset = 11;
@@ -1334,6 +1403,14 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) 
		     k < cfg->num_cfg && lcd_cfg;

		     k++, lcd_cfg++) {

			unsigned long size = lcd_cfg->yres * lcd_cfg->xres;

			/* NV12 buffers must have even number of lines */

			if ((cfg->nonstd) && cfg->bpp == 12 &&

					(lcd_cfg->yres & 0x1)) {

				dev_err(&pdev->dev, "yres must be multiple of 2"

						" for YCbCr420 mode.\n");

				error = -EINVAL;

				goto err1;

			}



			if (size > max_size) {

				max_cfg = lcd_cfg;
@@ -1348,7 +1425,11 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) 
				max_cfg->xres, max_cfg->yres);



		info->fix = sh_mobile_lcdc_fix;

		info->fix.smem_len = max_size * (cfg->bpp / 8) * 2;

		info->fix.smem_len = max_size * 2 * cfg->bpp / 8;



		 /* Only pan in 2 line steps for NV12 */

		if (cfg->nonstd && cfg->bpp == 12)

			info->fix.ypanstep = 2;



		if (!mode) {

			mode = &default_720p;
@@ -1366,7 +1447,7 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) 
		var->yres_virtual = var->yres * 2;

		var->activate = FB_ACTIVATE_NOW;



		error = sh_mobile_lcdc_set_bpp(var, cfg->bpp);

		error = sh_mobile_lcdc_set_bpp(var, cfg->bpp, cfg->nonstd);

		if (error)

			break;
@@ -1390,7 +1471,11 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) 
		}



		info->fix.smem_start = ch->dma_handle;

		if (var->nonstd)

			info->fix.line_length = var->xres;

		else

			info->fix.line_length = var->xres * (cfg->bpp / 8);



		info->screen_base = buf;

		info->device = &pdev->dev;

		ch->display_var = *var;

drivers/video/sh_mobile_lcdcfb.h

+1 −1
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ 


/* per-channel registers */

enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,

       LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR,

       LDSM2R, LDSA1R, LDSA2R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR,

       LDHAJR,

       NR_CH_REGS };

include/video/sh_mobile_lcdc.h

+1 −0
Original line number Diff line number Diff line
@@ -86,6 +86,7 @@ struct sh_mobile_lcdc_chan_cfg { 
	struct sh_mobile_lcdc_board_cfg board_cfg;

	struct sh_mobile_lcdc_bl_info bl_info;

	struct sh_mobile_lcdc_sys_bus_cfg sys_bus_cfg; /* only for SYSn I/F */

	int nonstd;

};



struct sh_mobile_lcdc_info {

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