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| author | Dibin Moolakadan Subrahmanian <[email protected]> | 2025-05-28 06:45:56 +0000 |
|---|---|---|
| committer | Joonas Lahtinen <[email protected]> | 2025-06-04 14:30:53 +0000 |
| commit | 791d76005de0ab556b590473eb4cbfede727fce0 (patch) | |
| tree | 71cd0d88b611ff84ed697b43ef059d69e2b5c823 /drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | |
| parent | drm/i915/guc: Handle race condition where wakeref count drops below 0 (diff) | |
| download | kernel-791d76005de0ab556b590473eb4cbfede727fce0.tar.gz kernel-791d76005de0ab556b590473eb4cbfede727fce0.zip | |
drm/i915/display: Fix u32 overflow in SNPS PHY HDMI PLL setup
When configuring the HDMI PLL, calculations use DIV_ROUND_UP_ULL and
DIV_ROUND_DOWN_ULL macros, which internally rely on do_div. However, do_div
expects a 32-bit (u32) divisor, and at higher data rates, the divisor can
exceed this limit. This leads to incorrect division results and
ultimately misconfigured PLL values.
This fix replaces do_div calls with div64_base64 calls where diviser
can exceed u32 limit.
Fixes: 5947642004bf ("drm/i915/display: Add support for SNPS PHY HDMI PLL algorithm for DG2")
Cc: Ankit Nautiyal <[email protected]>
Cc: Suraj Kandpal <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Dibin Moolakadan Subrahmanian <[email protected]>
Reviewed-by: Ankit Nautiyal <[email protected]>
Signed-off-by: Ankit Nautiyal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
(cherry picked from commit ce924116e43ffbfa544d82976c4b9d11bcde9334)
Signed-off-by: Joonas Lahtinen <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c')
0 files changed, 0 insertions, 0 deletions