Commit f34c6b31 authored by Imre Deak's avatar Imre Deak
Browse files

drm/i915/dp_mst: Track min link BPP as x16 fixed-point during mode validation 



Track the minimum link BPP as an x16 fixed-point value and, for
clarity, rename the variable storing it to min_link_bpp_x16.

Reviewed-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260216070421.714884-4-imre.deak@intel.com
parent 076c05a2

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

+3 −3
Original line number Diff line number Diff line
@@ -1463,10 +1463,10 @@ mst_connector_mode_valid_ctx(struct drm_connector *_connector, 
	struct intel_dp *intel_dp = connector->mst.dp;

	struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst.mgr;

	struct drm_dp_mst_port *port = connector->mst.port;

	const int min_bpp = 18;

	int max_rate, mode_rate, max_lanes, max_link_clock;

	unsigned long bw_overhead_flags =

		DRM_DP_BW_OVERHEAD_MST | DRM_DP_BW_OVERHEAD_SSC_REF_CLK;

	int min_link_bpp_x16 = fxp_q4_from_int(18);

	int ret;

	bool dsc = false;

	int target_clock = mode->clock;
@@ -1498,7 +1498,7 @@ mst_connector_mode_valid_ctx(struct drm_connector *_connector, 
					       max_link_clock, max_lanes);

	mode_rate = intel_dp_link_required(max_link_clock, max_lanes,

					   mode->clock, mode->hdisplay,

					   fxp_q4_from_int(min_bpp),

					   min_link_bpp_x16,

					   bw_overhead_flags);



	/*
@@ -1518,7 +1518,7 @@ mst_connector_mode_valid_ctx(struct drm_connector *_connector, 
		return ret;



	if (mode_rate > max_rate ||

	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {

	    drm_dp_calc_pbn_mode(mode->clock, min_link_bpp_x16) > port->full_pbn) {

		*status = MODE_CLOCK_HIGH;

		return 0;

	}