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fb: add a line_length value to struct fb_info 

Add support for framebuffers with noncontiguous horizontal lines.

Video drivers can set this value if the hardware requires it.
In case a driver does not set it, the current value of
xres * (bpp / 8) is used instead.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andre Heider 2013-11-05 00:00:59 +01:00 committed by Sascha Hauer
parent 7a305b2d8a
commit 485544f0fb
2 changed files with 10 additions and 2 deletions
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11
drivers/video/fb.c
View File

@ -72,12 +72,16 @@ static int fb_setup_mode(struct device_d *dev, struct param_d *param,
info->xres = info->mode->xres;
info->yres = info->mode->yres;
info->line_length = 0;
ret = info->fbops->fb_activate_var(info);
if (!info->line_length)
info->line_length = info->xres * (info->bits_per_pixel >> 3);
if (!ret) {
dev->resource[0].start = (resource_size_t)info->screen_base;
info->cdev.size = info->xres * info->yres * (info->bits_per_pixel >> 3);
info->cdev.size = info->line_length * info->yres;
dev->resource[0].end = dev->resource[0].start + info->cdev.size - 1;
dev_param_set_generic(dev, param, val);
} else
@ -122,9 +126,12 @@ int register_framebuffer(struct fb_info *info)
dev = &info->dev;
if (!info->line_length)
info->line_length = info->xres * (info->bits_per_pixel >> 3);
info->cdev.ops = &fb_ops;
info->cdev.name = asprintf("fb%d", id);
info->cdev.size = info->xres * info->yres * (info->bits_per_pixel >> 3);
info->cdev.size = info->line_length * info->yres;
info->cdev.dev = dev;
info->cdev.priv = info;
dev->resource = xzalloc(sizeof(struct resource));

1
include/fb.h
View File

@ -94,6 +94,7 @@ struct fb_info {
u32 xres; /* visible resolution */
u32 yres;
u32 bits_per_pixel; /* guess what */
u32 line_length; /* length of a line in bytes */
u32 grayscale; /* != 0 Graylevels instead of colors */