[PATCH 5.10/5.15 0/1] drm/i915: Fix possible int overflow in skl_ddi_calculate_wrpll()

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This patch addresses issues of integer overflow and possibly erroneous
integer promotion in skl_ddi_calculate_wrpll() and
skl_ddi_hdmi_pll_dividers() in kernel versions 5.10 and 5.15.

The problem has been fixed in upstream and stable versions up to 6.1
with commit:
5b5115726601 ("drm/i915: Fix possible int overflow in skl_ddi_calculate_wrpll()")

Due to changes to skl_ddi_calculate_wrpll() return value the patch had
to be slightly modified during cherry-picking, leaving the original
fix intact, and can now be cleanly applied to 5.10 and 5.15 kernels.






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