diff options
| author | Ankit Nautiyal <ankit.k.nautiyal@intel.com> | 2025-06-18 18:39:50 +0530 |
|---|---|---|
| committer | Joonas Lahtinen <joonas.lahtinen@linux.intel.com> | 2025-06-23 14:59:55 +0300 |
| commit | 9205999e9f13a07cb29d5a8836c25afdca186007 (patch) | |
| tree | b9ce6bf85c1222dd21bb0b038b2ff7b8175223cc /scripts/lib/kdoc/kdoc_parser.py | |
| parent | 86731a2a651e58953fc949573895f2fa6d456841 (diff) | |
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 <vasya.novikov@gmail.com>
Closes: https://lore.kernel.org/all/8d7c7958-9558-4c8a-a81a-e9310f2d8852@gmail.com/
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Vas Novikov <vasya.novikov@gmail.com>
Cc: stable@vger.kernel.org # v6.15+
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://lore.kernel.org/r/20250618130951.1596587-2-ankit.k.nautiyal@intel.com
(cherry picked from commit b300a175a11e6a934d728317dc39787723cc7917)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Diffstat (limited to 'scripts/lib/kdoc/kdoc_parser.py')
0 files changed, 0 insertions, 0 deletions