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drm/i915/dp: Account with MST, SSC BW overhead for uncompressed DP-MST stream BW

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On MST links the symbol alignment and SSC have a BW overhead, which
should be accounted for when calculating the required stream BW, do so
during mode validation for an uncompressed stream.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251215192357.172201-11-imre.deak@intel.com
This commit is contained in:
Imre Deak 2025-12-15 21:23:50 +02:00
parent 2fb850a6ae
commit e25b6f1334
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@ -1458,6 +1458,8 @@ mst_connector_mode_valid_ctx(struct drm_connector *_connector,
const int min_bpp = 18;
int max_dotclk = display->cdclk.max_dotclk_freq;
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 ret;
bool dsc = false;
u16 dsc_max_compressed_bpp = 0;
@ -1491,7 +1493,8 @@ 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), 0);
fxp_q4_from_int(min_bpp),
bw_overhead_flags);
/*
* TODO: