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| author | Imre Deak <imre.deak@intel.com> | 2023-11-16 16:18:37 +0300 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2023-11-21 17:32:44 +0300 |
| commit | e86fb4dcfb3c4e9da8855312ada0f22629423b00 (patch) | |
| tree | cedd49b46e8aead95866268239adfd00030afb18 /drivers/gpu/drm | |
| parent | 7e17537719107e7b3b942d76919d020f8c779271 (diff) | |
| download | linux-e86fb4dcfb3c4e9da8855312ada0f22629423b00.tar.xz | |
drm/i915/dp_mst: Calculate the BW overhead in intel_dp_mst_find_vcpi_slots_for_bpp()
The next patch will calculate the PBN value directly from the pixel data
rate and the BW allocation overhead, not requiring the data, link M/N
and TU values for this. To prepare for that move the calculation of BW
overheads from intel_dp_mst_compute_m_n() to
intel_dp_mst_find_vcpi_slots_for_bpp().
While at it store link_bpp in a .4 fixed point format.
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231116131841.1588781-8-imre.deak@intel.com
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_mst.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index e5d6b811c22e..a5ddd1781969 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -108,15 +108,12 @@ static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state, static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state, const struct intel_connector *connector, - bool ssc, bool dsc, + int overhead, int bpp_x16, struct intel_link_m_n *m_n) { const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; - int overhead = intel_dp_mst_bw_overhead(crtc_state, - connector, - ssc, dsc, bpp_x16); intel_link_compute_m_n(bpp_x16, crtc_state->lane_count, adjusted_mode->crtc_clock, @@ -171,7 +168,9 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder, for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) { struct intel_link_m_n remote_m_n; - int link_bpp; + int local_bw_overhead; + int remote_bw_overhead; + int link_bpp_x16; drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp); @@ -179,12 +178,22 @@ static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder, if (ret) continue; - link_bpp = dsc ? bpp : - intel_dp_output_bpp(crtc_state->output_format, bpp); + link_bpp_x16 = to_bpp_x16(dsc ? bpp : + intel_dp_output_bpp(crtc_state->output_format, bpp)); - intel_dp_mst_compute_m_n(crtc_state, connector, false, dsc, to_bpp_x16(link_bpp), + local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector, + false, dsc, link_bpp_x16); + remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector, + true, dsc, link_bpp_x16); + + intel_dp_mst_compute_m_n(crtc_state, connector, + local_bw_overhead, + link_bpp_x16, &crtc_state->dp_m_n); - intel_dp_mst_compute_m_n(crtc_state, connector, true, dsc, to_bpp_x16(link_bpp), + + intel_dp_mst_compute_m_n(crtc_state, connector, + remote_bw_overhead, + link_bpp_x16, &remote_m_n); /* |