Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/i915/dp_mst: Enable fractional link bpps on MST if the bpp is forced
Enable using a fractional (compressed) link bpp on MST links, if this is
supported and the link bpp is forced. Fractional link bpps will be
enabled by default as a follow-up change after testing this
functionality within a set of commonly used MST monitors and docks/hubs
which support it.
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250509180340.554867-13-imre.deak@intel.com
+8
-2
+5
-1
drivers/gpu/drm/i915/display/intel_dp.c
+5
-1
drivers/gpu/drm/i915/display/intel_dp.c
···
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/*
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* Note: for pre-13 display you still need to check the validity of each step.
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*/
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-
static int intel_dp_dsc_bpp_step_x16(const struct intel_connector *connector)
2106
+
int intel_dp_dsc_bpp_step_x16(const struct intel_connector *connector)
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{
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struct intel_display *display = to_intel_display(connector);
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u8 incr = drm_dp_dsc_sink_bpp_incr(connector->dp.dsc_dpcd);
2110
2110
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if (DISPLAY_VER(display) < 14 || !incr)
2112
+
return fxp_q4_from_int(1);
2113
+
2114
+
if (connector->mst.dp &&
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+
!connector->link.force_bpp_x16 && !connector->mst.dp->force_dsc_fractional_bpp_en)
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return fxp_q4_from_int(1);
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/* fxp q4 */
+2
drivers/gpu/drm/i915/display/intel_dp.h
+2
drivers/gpu/drm/i915/display/intel_dp.h
+1
-1
drivers/gpu/drm/i915/display/intel_dp_mst.c
+1
-1
drivers/gpu/drm/i915/display/intel_dp_mst.c
···
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"DSC Sink supported compressed min bpp " FXP_Q4_FMT " compressed max bpp " FXP_Q4_FMT "\n",
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FXP_Q4_ARGS(min_compressed_bpp_x16), FXP_Q4_ARGS(max_compressed_bpp_x16));
501
501
502
-
bpp_step_x16 = fxp_q4_from_int(1);
502
+
bpp_step_x16 = intel_dp_dsc_bpp_step_x16(connector);
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max_compressed_bpp_x16 = min(max_compressed_bpp_x16, fxp_q4_from_int(crtc_state->pipe_bpp) - bpp_step_x16);
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505