[PATCH v2 01/10] video: da8xx-fb: fb_check_var enhancement
From: Afzal Mohammed <hidden>
Date: 2013-01-07 05:04:05
Also in:
linux-devicetree, linux-omap, lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
Check whether "struct fb_var_screeninfo" fields are sane, if not update it to be within allowed limits. If user sends down buggy "var" values, this will bring those within allowable limits. And fb_set_par is not supposed to change "var" values, fb_check_var has to ensure that values are proper. Signed-off-by: Afzal Mohammed <redacted> --- drivers/video/da8xx-fb.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 46534e0..89446aa 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c@@ -888,6 +888,9 @@ static int fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { int err = 0; + struct da8xx_fb_par *par = info->par; + int bpp = var->bits_per_pixel >> 3; + unsigned long line_size = var->xres_virtual * bpp; if (var->bits_per_pixel > 16 && lcd_revision = LCD_VERSION_1) return -EINVAL;
@@ -955,6 +958,21 @@ static int fb_check_var(struct fb_var_screeninfo *var, var->green.msb_right = 0; var->blue.msb_right = 0; var->transp.msb_right = 0; + + if (line_size * var->yres_virtual > par->vram_size) + var->yres_virtual = par->vram_size / line_size; + + if (var->yres > var->yres_virtual) + var->yres = var->yres_virtual; + + if (var->xres > var->xres_virtual) + var->xres = var->xres_virtual; + + if (var->xres + var->xoffset > var->xres_virtual) + var->xoffset = var->xres_virtual - var->xres; + if (var->yres + var->yoffset > var->yres_virtual) + var->yoffset = var->yres_virtual - var->yres; + return err; }
--
1.7.9.5