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atmel_lcdfb: validate display timings

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Setting a display timing parameter too high or too low may cause it to
wrap around and thus become completely wrong. Validate the timings in
atmel_lcdfb_check_var() and saturate to the highest or lowest possible
value if necessary.

Signed-off-by: Haavard Skinnemoen <[email protected]>
Cc: "Antonino A. Daplas" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Haavard Skinnemoen 2008-02-06 01:39:11 -08:00 • committed by Linus Torvalds
commit 162b3a0849
2 changed files with 27 additions and 7 deletions
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20
drivers/video/atmel_lcdfb.c
View file

@ -203,6 +203,26 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
var->transp.offset = var->transp.length = 0;
var->xoffset = var->yoffset = 0;
/* Saturate vertical and horizontal timings at maximum values */
var->vsync_len = min_t(u32, var->vsync_len,
(ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
var->upper_margin = min_t(u32, var->upper_margin,
ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
var->lower_margin = min_t(u32, var->lower_margin,
ATMEL_LCDC_VFP);
var->right_margin = min_t(u32, var->right_margin,
(ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
var->hsync_len = min_t(u32, var->hsync_len,
(ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
var->left_margin = min_t(u32, var->left_margin,
ATMEL_LCDC_HBP + 1);
/* Some parameters can't be zero */
var->vsync_len = max_t(u32, var->vsync_len, 1);
var->right_margin = max_t(u32, var->right_margin, 1);
var->hsync_len = max_t(u32, var->hsync_len, 1);
var->left_margin = max_t(u32, var->left_margin, 1);
switch (var->bits_per_pixel) {
case 1:
case 2: