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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 <hskinnemoen@atmel.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Haavard Skinnemoen
2008-02-06 01:39:11 -08:00
committed by Linus Torvalds
parent 529e55b6a5
commit 162b3a0849
2 changed files with 27 additions and 7 deletions
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include/video/atmel_lcdc.h
+7 -7
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@@ -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)