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drm/i915/dp: Fail state computation for invalid min/max link BPP values

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Make sure that state computation fails if the minimum/maximum link BPP
values got invalid as a result of limiting both of these values
separately to the corresponding source/sink capability limits.

Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251215192357.172201-14-imre.deak@intel.com
This commit is contained in:
Imre Deak 2025-12-15 21:23:53 +02:00
parent 3755e200bc
commit 2018e29176
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/i915/display/intel_dp.c
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@ -2646,7 +2646,7 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
limits->link.max_bpp_x16 = max_link_bpp_x16;
drm_dbg_kms(display->drm,
"[ENCODER:%d:%s][CRTC:%d:%s] DP link limits: pixel clock %d kHz DSC %s max lanes %d max rate %d max pipe_bpp %d max link_bpp " FXP_Q4_FMT "\n",
"[ENCODER:%d:%s][CRTC:%d:%s] DP link limits: pixel clock %d kHz DSC %s max lanes %d max rate %d max pipe_bpp %d min link_bpp " FXP_Q4_FMT " max link_bpp " FXP_Q4_FMT "\n",
encoder->base.base.id, encoder->base.name,
crtc->base.base.id, crtc->base.name,
adjusted_mode->crtc_clock,
@ -2654,8 +2654,13 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
limits->max_lane_count,
limits->max_rate,
limits->pipe.max_bpp,
FXP_Q4_ARGS(limits->link.min_bpp_x16),
FXP_Q4_ARGS(limits->link.max_bpp_x16));
if (limits->link.min_bpp_x16 <= 0 ||
limits->link.min_bpp_x16 > limits->link.max_bpp_x16)
return false;
return true;
}