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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2018-02-14 09:17:47 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-02-14 12:02:44 +0000 |
| commit | 5af4ce7d81a5945ad11ca04a68e7f1febd67d59f (patch) | |
| tree | 1395f74ce714f0e040aef83cd3e6ca598825b8c5 /drivers/gpu/drm/i915/intel_panel.c | |
| parent | drm/i915/panel: Add missing parameters to kerneldoc (diff) | |
| download | linux-dev-5af4ce7d81a5945ad11ca04a68e7f1febd67d59f.tar.xz linux-dev-5af4ce7d81a5945ad11ca04a68e7f1febd67d59f.zip | |
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
Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 41296935ef11..41d00b1603e3 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -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; |