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fbdev: sh_mobile_lcdc: Adjust requested parameters in .fb_check_var 

Instead of failing when the requested fb_var_screeninfo parameters are
not supported, adjust the parameters according to the hardware
capabilities.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Laurent Pinchart 2011-08-31 13:00:53 +02:00 committed by Florian Tobias Schandinat
parent da6cf5125f
commit 0386219441
1 changed files with 88 additions and 15 deletions
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103
drivers/video/sh_mobile_lcdcfb.c
View File

@ -1055,29 +1055,102 @@ static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *in
{
struct sh_mobile_lcdc_chan *ch = info->par;
struct sh_mobile_lcdc_priv *p = ch->lcdc;
unsigned int best_dist = (unsigned int)-1;
unsigned int best_xres = 0;
unsigned int best_yres = 0;
unsigned int i;
if (var->xres > MAX_XRES || var->yres > MAX_YRES ||
var->xres * var->yres * (ch->cfg.bpp / 8) * 2 > info->fix.smem_len) {
dev_warn(info->dev, "Invalid info: %u-%u-%u-%u x %u-%u-%u-%u @ %lukHz!\n",
var->left_margin, var->xres, var->right_margin, var->hsync_len,
var->upper_margin, var->yres, var->lower_margin, var->vsync_len,
PICOS2KHZ(var->pixclock));
if (var->xres > MAX_XRES || var->yres > MAX_YRES)
return -EINVAL;
/* If board code provides us with a list of available modes, make sure
* we use one of them. Find the mode closest to the requested one. The
* distance between two modes is defined as the size of the
* non-overlapping parts of the two rectangles.
*/
for (i = 0; i < ch->cfg.num_cfg; ++i) {
const struct fb_videomode *mode = &ch->cfg.lcd_cfg[i];
unsigned int dist;
/* We can only round up. */
if (var->xres > mode->xres || var->yres > mode->yres)
continue;
dist = var->xres * var->yres + mode->xres * mode->yres
- 2 * min(var->xres, mode->xres)
* min(var->yres, mode->yres);
if (dist < best_dist) {
best_xres = mode->xres;
best_yres = mode->yres;
best_dist = dist;
}
}
/* If no available mode can be used, return an error. */
if (ch->cfg.num_cfg != 0) {
if (best_dist == (unsigned int)-1)
return -EINVAL;
var->xres = best_xres;
var->yres = best_yres;
}
/* Make sure the virtual resolution is at least as big as the visible
* resolution.
*/
if (var->xres_virtual < var->xres)
var->xres_virtual = var->xres;
if (var->yres_virtual < var->yres)
var->yres_virtual = var->yres;
if (var->bits_per_pixel <= 16) { /* RGB 565 */
var->bits_per_pixel = 16;
var->red.offset = 11;
var->red.length = 5;
var->green.offset = 5;
var->green.length = 6;
var->blue.offset = 0;
var->blue.length = 5;
var->transp.offset = 0;
var->transp.length = 0;
} else if (var->bits_per_pixel <= 24) { /* RGB 888 */
var->bits_per_pixel = 24;
var->red.offset = 16;
var->red.length = 8;
var->green.offset = 8;
var->green.length = 8;
var->blue.offset = 0;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
} else if (var->bits_per_pixel <= 32) { /* RGBA 888 */
var->bits_per_pixel = 32;
var->red.offset = 16;
var->red.length = 8;
var->green.offset = 8;
var->green.length = 8;
var->blue.offset = 0;
var->blue.length = 8;
var->transp.offset = 24;
var->transp.length = 8;
} else
return -EINVAL;
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
var->transp.msb_right = 0;
/* Make sure we don't exceed our allocated memory. */
if (var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8 >
info->fix.smem_len)
return -EINVAL;
/* only accept the forced_bpp for dual channel configurations */
if (p->forced_bpp && p->forced_bpp != var->bits_per_pixel)
return -EINVAL;
switch (var->bits_per_pixel) {
case 16: /* PKF[4:0] = 00011 - RGB 565 */
case 24: /* PKF[4:0] = 01011 - RGB 888 */
case 32: /* PKF[4:0] = 00000 - RGBA 888 */
break;
default:
return -EINVAL;
}
return 0;
}