Commit 5af4ce7d authored by Chris Wilson's avatar Chris Wilson
Browse files

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: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214091747.12753-2-chris@chris-wilson.co.uk
parent e9a744fa

drivers/gpu/drm/i915/intel_panel.c

+3 −2
Original line number Diff line number Diff line
@@ -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;

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