drm/i915/dp: fix integer overflow in 128b/132b data rate calculation
The intermediate value 1000000 * 10 * 9671 overflows 32 bits, so force promotion to a bigger type. From the logs: [drm:intel_dp_compute_config [i915]] DP link rate required 3657063 available -580783288 v2: Use mul_u32_u32() (Ville) Fixes: 48efd014f0ea ("drm/i915/dp: add max data rate calculation for UHBR rates") Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211026093407.11381-1-jani.nikula@intel.com (cherry picked from commit bf0d608b55d9b7f426031dfd9f08d9df36c94728) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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@ -287,7 +287,7 @@ intel_dp_max_data_rate(int max_link_rate, int max_lanes)
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*/
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int max_link_rate_kbps = max_link_rate * 10;
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max_link_rate_kbps = DIV_ROUND_CLOSEST_ULL(max_link_rate_kbps * 9671, 10000);
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max_link_rate_kbps = DIV_ROUND_CLOSEST_ULL(mul_u32_u32(max_link_rate_kbps, 9671), 10000);
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max_link_rate = max_link_rate_kbps / 8;
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}
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