Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=162b3a084904a1d6ef1553782b8573885d5f900b
Commit: 162b3a084904a1d6ef1553782b8573885d5f900b
Parent: 529e55b6a57bda6df9e45eb268589efc70f63303
Author: Haavard Skinnemoen <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 6 01:39:11 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Feb 6 10:41:15 2008 -0800
atmel_lcdfb: validate display timings
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]>
---
drivers/video/atmel_lcdfb.c | 20 ++++++++++++++++++++
include/video/atmel_lcdc.h | 14 +++++++-------
2 files changed, 27 insertions(+), 7 deletions(-)
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index f8e7111..5d22ea5 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -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:
diff --git a/include/video/atmel_lcdc.h b/include/video/atmel_lcdc.h
index 4eea637..76095e7 100644
--- a/include/video/atmel_lcdc.h
+++ b/include/video/atmel_lcdc.h
@@ -115,20 +115,20 @@ struct atmel_lcdfb_info {
#define ATMEL_LCDC_MEMOR_LITTLE (1 << 31)
#define ATMEL_LCDC_TIM1 0x0808
-#define ATMEL_LCDC_VFP (0xff << 0)
+#define ATMEL_LCDC_VFP (0xffU << 0)
#define ATMEL_LCDC_VBP_OFFSET 8
-#define ATMEL_LCDC_VBP (0xff << ATMEL_LCDC_VBP_OFFSET)
+#define ATMEL_LCDC_VBP (0xffU << ATMEL_LCDC_VBP_OFFSET)
#define ATMEL_LCDC_VPW_OFFSET 16
-#define ATMEL_LCDC_VPW (0x3f << ATMEL_LCDC_VPW_OFFSET)
+#define ATMEL_LCDC_VPW (0x3fU << ATMEL_LCDC_VPW_OFFSET)
#define ATMEL_LCDC_VHDLY_OFFSET 24
-#define ATMEL_LCDC_VHDLY (0xf << ATMEL_LCDC_VHDLY_OFFSET)
+#define ATMEL_LCDC_VHDLY (0xfU << ATMEL_LCDC_VHDLY_OFFSET)
#define ATMEL_LCDC_TIM2 0x080c
-#define ATMEL_LCDC_HBP (0xff << 0)
+#define ATMEL_LCDC_HBP (0xffU << 0)
#define ATMEL_LCDC_HPW_OFFSET 8
-#define ATMEL_LCDC_HPW (0x3f << ATMEL_LCDC_HPW_OFFSET)
+#define ATMEL_LCDC_HPW (0x3fU << ATMEL_LCDC_HPW_OFFSET)
#define ATMEL_LCDC_HFP_OFFSET 21
-#define ATMEL_LCDC_HFP (0x7ff << ATMEL_LCDC_HFP_OFFSET)
+#define ATMEL_LCDC_HFP (0x7ffU << ATMEL_LCDC_HFP_OFFSET)
#define ATMEL_LCDC_LCDFRMCFG 0x0810
#define ATMEL_LCDC_LINEVAL (0x7ff << 0)
-
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