Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/i915/dp: Factor out intel_dp_link_bw_overhead()
Factor out intel_dp_link_bw_overhead(), used later for BW calculation
during DP SST mode validation and state computation.
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251215192357.172201-7-imre.deak@intel.com
+34
-16
+26
drivers/gpu/drm/i915/display/intel_dp.c
+26
drivers/gpu/drm/i915/display/intel_dp.c
···
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return 1;
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}
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+
int intel_dp_link_bw_overhead(int link_clock, int lane_count, int hdisplay,
428
+
int dsc_slice_count, int bpp_x16, unsigned long flags)
429
+
{
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+
int overhead;
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+
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+
WARN_ON(flags & ~(DRM_DP_BW_OVERHEAD_MST | DRM_DP_BW_OVERHEAD_SSC_REF_CLK |
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+
DRM_DP_BW_OVERHEAD_FEC));
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+
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+
if (drm_dp_is_uhbr_rate(link_clock))
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+
flags |= DRM_DP_BW_OVERHEAD_UHBR;
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+
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+
if (dsc_slice_count)
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+
flags |= DRM_DP_BW_OVERHEAD_DSC;
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+
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overhead = drm_dp_bw_overhead(lane_count, hdisplay,
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dsc_slice_count,
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+
bpp_x16,
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+
flags);
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+
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+
/*
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+
* TODO: clarify whether a minimum required by the fixed FEC overhead
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+
* in the bspec audio programming sequence is required here.
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+
*/
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+
return max(overhead, intel_dp_bw_fec_overhead(flags & DRM_DP_BW_OVERHEAD_FEC));
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+
}
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+
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/*
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* The required data bandwidth for a mode with given pixel clock and bpp. This
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455
* is the required net bandwidth independent of the data bandwidth efficiency.
+2
drivers/gpu/drm/i915/display/intel_dp.h
+2
drivers/gpu/drm/i915/display/intel_dp.h
···
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bool intel_dp_source_supports_tps3(struct intel_display *display);
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bool intel_dp_source_supports_tps4(struct intel_display *display);
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+
int intel_dp_link_bw_overhead(int link_clock, int lane_count, int hdisplay,
121
+
int dsc_slice_count, int bpp_x16, unsigned long flags);
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int intel_dp_link_required(int pixel_clock, int bpp);
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int intel_dp_effective_data_rate(int pixel_clock, int bpp_x16,
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int bw_overhead);
+6
-16
drivers/gpu/drm/i915/display/intel_dp_mst.c
+6
-16
drivers/gpu/drm/i915/display/intel_dp_mst.c
···
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const struct drm_display_mode *adjusted_mode =
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&crtc_state->hw.adjusted_mode;
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unsigned long flags = DRM_DP_BW_OVERHEAD_MST;
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-
int overhead;
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-
flags |= intel_dp_is_uhbr(crtc_state) ? DRM_DP_BW_OVERHEAD_UHBR : 0;
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flags |= ssc ? DRM_DP_BW_OVERHEAD_SSC_REF_CLK : 0;
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flags |= crtc_state->fec_enable ? DRM_DP_BW_OVERHEAD_FEC : 0;
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-
if (dsc_slice_count)
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-
flags |= DRM_DP_BW_OVERHEAD_DSC;
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-
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overhead = drm_dp_bw_overhead(crtc_state->lane_count,
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-
adjusted_mode->hdisplay,
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-
dsc_slice_count,
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-
bpp_x16,
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-
flags);
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-
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-
/*
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-
* TODO: clarify whether a minimum required by the fixed FEC overhead
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-
* in the bspec audio programming sequence is required here.
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-
*/
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-
return max(overhead, intel_dp_bw_fec_overhead(crtc_state->fec_enable));
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+
return intel_dp_link_bw_overhead(crtc_state->port_clock,
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+
crtc_state->lane_count,
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+
adjusted_mode->hdisplay,
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+
dsc_slice_count,
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+
bpp_x16,
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+
flags);
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}
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static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,