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

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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: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260216070421.714884-4-imre.deak@intel.com
This commit is contained in:
Imre Deak 2026-02-16 09:04:20 +02:00
parent 076c05a21a
commit f34c6b31d1
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@ -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;
}