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drm/i915/panel: Split range scaling calculation for readiblity 

Split the 64b multiplication from the division so that it doesn't sprawl
across a couple of lines and use mul_u32_u32() instead of open-coding
the 64b conversion.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214091747.12753-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-02-14 09:17:47 +00:00
parent e9a744fa60
commit 5af4ce7d81
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/intel_panel.c
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@ -419,8 +419,9 @@ static uint32_t scale(uint32_t source_val,
source_val = clamp(source_val, source_min, source_max);
/* avoid overflows */
target_val = DIV_ROUND_CLOSEST_ULL((uint64_t)(source_val - source_min) *
(target_max - target_min), source_max - source_min);
target_val = mul_u32_u32(source_val - source_min,
target_max - target_min);
target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
target_val += target_min;
return target_val;