drm/i915: prevent FIFO calculation overflows on 32 bits with high dotclocks

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A very high dotclock (e.g. 229500kHz as reported by Anton) can cause
the entries_required variable to overflow, potentially leading to a
FIFO watermark value that's too low to support the given mode.  Split
the division across the calculation to avoid this.

Cc: stable@kernel.org
Reported-by: Anton Khirnov <wyskas@gmail.com>
Tested-by: Anton Khirnov <wyskas@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

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This commit is contained in:

Jesse Barnes 2009-09-11 12:25:56 -07:00

parent decbbcda29

commit d660467c3f

1 changed files with 8 additions and 1 deletions

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9

drivers/gpu/drm/i915/intel_display.c

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