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: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index e040e46..bf2629f 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -69,6 +69,7 @@
[LDSM1R] = 0x428,
[LDSM2R] = 0x42c,
[LDSA1R] = 0x430,
+ [LDSA2R] = 0x434,
[LDMLSR] = 0x438,
[LDHCNR] = 0x448,
[LDHSYNR] = 0x44c,
@@ -153,6 +154,7 @@
case LDDFR:
case LDSM1R:
case LDSA1R:
+ case LDSA2R:
case LDMLSR:
case LDHCNR:
case LDHSYNR:
@@ -465,6 +467,7 @@
struct sh_mobile_lcdc_board_cfg *board_cfg;
unsigned long tmp;
int bpp = 0;
+ unsigned long ldddsr;
int k, m;
int ret = 0;
@@ -543,16 +546,21 @@
}
/* word and long word swap */
- switch (bpp) {
- case 16:
- lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
- break;
- case 24:
- lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 7);
- break;
- case 32:
- lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 4);
- break;
+ 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, ldddsr | 6);
+ break;
+ case 24:
+ lcdc_write(priv, _LDDDSR, ldddsr | 7);
+ break;
+ case 32:
+ lcdc_write(priv, _LDDDSR, ldddsr | 4);
+ break;
+ }
}
for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
@@ -563,21 +571,40 @@
/* set bpp format in PKF[4:0] */
tmp = lcdc_read_chan(ch, LDDFR);
- tmp &= ~0x0001001f;
- switch (ch->info->var.bits_per_pixel) {
- case 16:
- tmp |= 0x03;
- break;
- case 24:
- tmp |= 0x0b;
- break;
- case 32:
- break;
+ 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;
+ break;
+ case 24:
+ tmp |= 0x0b;
+ break;
+ 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 @@
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;
- new_pan_offset = (var->yoffset * info->fix.line_length) +
- (var->xoffset * (info->var.bits_per_pixel / 8));
+ 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 @@
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
@@ -897,7 +949,10 @@
/* Couldn't reconfigure, hopefully, can continue as before */
return;
- info->fix.line_length = mode1.xres * (ch->cfg.bpp / 8);
+ if (info->var.nonstd)
+ info->fix.line_length = mode1.xres;
+ else
+ info->fix.line_length = mode1.xres * (ch->cfg.bpp / 8);
/*
* fb_set_var() calls the notifier change internally, only if
@@ -1050,8 +1105,22 @@
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 @@
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 @@
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 @@
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 @@
}
info->fix.smem_start = ch->dma_handle;
- info->fix.line_length = var->xres * (cfg->bpp / 8);
+ 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;