drm/i915/snps_hdmi_pll: Fix 64-bit divisor truncation by using div64_u64

DIV_ROUND_CLOSEST_ULL uses do_div(), which expects a 32-bit divisor.
When passing a 64-bit constant like CURVE2_MULTIPLIER, the value is
silently truncated to u32, potentially leading to incorrect results
on large divisors.

Replace DIV_ROUND_CLOSEST_ULL with DIV64_U64_ROUND_CLOSEST which correctly
handles full 64-bit division.

v2: Use DIV64_U64_ROUND_CLOSEST instead of div64_u64 macro. (Jani)

Fixes: 5947642004bf ("drm/i915/display: Add support for SNPS PHY HDMI PLL algorithm for DG2")
Reported-by: Vas Novikov <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Cc: Ankit Nautiyal <[email protected]>
Cc: Suraj Kandpal <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Vas Novikov <[email protected]>
Cc: [email protected] # v6.15+
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Ankit Nautiyal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
(cherry picked from commit b300a175a11e6a934d728317dc39787723cc7917)
Signed-off-by: Joonas Lahtinen <[email protected]>

0 files changed, 0 insertions, 0 deletions