drm/i915/bw: Fix DCLK rounding mess

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Fix up the total mess when calculating the DCLK
frequency. Some codepaths are trying to do both DIV_ROUND_UP()
and an open coded "round to nearest" at the same time. The
MTL+ codepath was the only one that was correct (using
DIV_ROUND_CLOSEST()).

Let's unify all of them, and borrow the actual '100/6'
approach from adl_calc_psf_bw() so that we get even less
rounding errors.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260522200346.17377-3-ville.syrjala@linux.intel.com
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>

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Ville Syrjälä 2026-05-22 23:03:38 +03:00

parent 85bfe1cec2

commit 1f0d572b27

1 changed files with 14 additions and 12 deletions

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drivers/gpu/drm/i915/display/intel_bw.c

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