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4a2bdf0c87
Adjust the panel fixed mode selection algorithm to only consider fixed modes that are "VRR compatible" with the old fixed mode when userspace doesn't want to allow full modesets. This will allow a VRR based refresh rate changes (ie. just a change in the vblank length) via the fastset path. When full modesets are allowed, we still use the original algorithm as that may pick a fixed mode with a more optimal dotclock, potentially leading to reduced power consumption. This approach works as long as userspace does the initial allow_modeset=true commit using the highest refresh rate it will want to use. Subsequent commits with allow_modeset=false can then switch between lower refresh rates without blinks. One remaining hurdle we may need to solve is the guardband length. Assuming the highest refresh rate vblank is too short for intel_vrr_compute_optimized_guardband() the intitial guardband will match the highest refresh rate vblank. A subsequent switch to a lower refresh rate will then recompute the guardband and select a value that is higher (since the vblank will be longer). The mismatch in guardband lengths will prevent the fastset. We may either have to preserve the original (sub-optimal) guardband, or we'll have to revisit the idea of changing the guardband without a full modeset. Note that I'm not 100% happy with this solution because intel_panel_fixed_mode() is no longer fully idempotent, but I wasn't able to come up with anything truly better either :/ The simple solution would be just to always pick the fixed mode with the highest dotclock, but that could lead to increased power consumption even when high refresh rates are never used. Perhaps the proper solution would be to just deprecate this idea of taking in random modes for internal panels and then cooking up a compatible fixed modes. Life would be easier if userspace was required to provide the desired fixed mode directly. But in order to do that we'd need to introduce new uapi properties to control the pfit aspect of this, and we'd probably need a new client cap to select between the old and new userspace behaviour. Something to consider in the future... v2: Rebase due to earlier changes to VRR fixed mode selection Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> #v1 Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patch.msgid.link/20260622213602.7244-6-ville.syrjala@linux.intel.com Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Tested-by: Vidya Srinivas <vidya.srinivas@intel.com> Acked-by: Jani Nikula <jani.nikula@intel.com> |
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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