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drm/i915/dp_mst: Calculate the BW overhead in intel_dp_mst_find_vcpi_slots_for_bpp()

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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
This commit is contained in:
Imre Deak
2023-11-16 15:18:37 +02:00
parent 7e17537719
commit e86fb4dcfb
1 changed files with 18 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/gpu/drm/i915/display/intel_dp_mst.c
View File

@@ -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);
/*