drm/i915/dp: Unify detect and compute time DSC mode BW validation

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Atm, a DP DSC video mode's required BW vs. the available BW is
determined by calculating the maximum compressed BPP value allowed by
the available BW. Doing that using a closed-form formula as it's done
atm (vs. an iterative way) is problematic, since the overhead of the
required BW itself depends on the BPP value being calculated. Instead of
that calculate the required BW for the minimum compressed BPP value
supported both by the source and the sink and check this BW against the
available BW. This change also aligns the BW calculation during mode
validation with how this is done during state computation, calculating
the required effective data rate with the corresponding BW overhead.

Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251222153547.713360-14-imre.deak@intel.com

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Imre Deak 2025-12-22 17:35:40 +02:00

parent 745395b51c

commit 2bd5dd6e72

2 changed files with 20 additions and 129 deletions

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137

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

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8

drivers/gpu/drm/i915/display/intel_dp.h

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