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drm/i915/color: Preserve sign bit when int_bits is Zero 

When int_bits == 0, we lose the sign bit when we do the range check
and apply the mask.

Fix this by ensuring a minimum of one integer bit, which guarantees space
for the sign bit in fully fractional representations (e.g. S0.12)

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20251203085211.3663374-7-uma.shankar@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chaitanya Kumar Borah 2025-12-03 14:22:02 +05:30 committed by Jani Nikula
parent a78f1b6baf
commit 6f1e094fb6
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/display/intel_color.c
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@ -613,6 +613,8 @@ static u16 ctm_to_twos_complement(u64 coeff, int int_bits, int frac_bits)
if (CTM_COEFF_NEGATIVE(coeff))
c = -c;
int_bits = max(int_bits, 1);
c = clamp(c, -(s64)BIT(int_bits + frac_bits - 1),
(s64)(BIT(int_bits + frac_bits - 1) - 1));