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drm/i915/dp: Iterate configurations via link_caps for SST non-DSC

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Use the link caps configuration iterator for DP SST link configuration
computation for non-DSC mode. This is a step towards unifying
configuration selection and iteration across connector types and between
compute and fallback paths.

The iteration preserves the DP SST connector rate/lane ordering used by
the current code.

This also allows removing the now unused common rate count helper.

v2:
- Rebase on changes using a filter object instead of a mask of
  configuration indices.
- Rebase on changes using an iteration object.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260701153204.4124150-18-imre.deak@intel.com
This commit is contained in:
Imre Deak
2026-07-01 18:31:46 +03:00
parent bfc7a8fff3
commit 7266df62ed
1 changed files with 24 additions and 25 deletions
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49
drivers/gpu/drm/i915/display/intel_dp.c
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@@ -1754,43 +1754,42 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
const struct drm_connector_state *conn_state,
const struct link_config_limits *limits)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
int bpp, clock = intel_dp_mode_clock(pipe_config, conn_state);
struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
int bpp, i, lane_count, clock = intel_dp_mode_clock(pipe_config, conn_state);
int link_rate, link_avail;
struct intel_dp_link_caps_order order =
intel_dp_link_caps_connector_compute_order(connector);
int link_avail;
for (bpp = fxp_q4_to_int(limits->link.max_bpp_x16);
bpp >= fxp_q4_to_int(limits->link.min_bpp_x16);
bpp -= 2 * 3) {
int link_bpp_x16 =
intel_dp_output_format_link_bpp_x16(pipe_config->output_format, bpp);
struct intel_dp_link_config link_config;
struct intel_dp_link_caps_iter iter;
for (i = 0; i < intel_dp_link_caps_num_common_rates(intel_dp->link.caps); i++) {
link_rate = intel_dp_common_rate(link_caps, i);
if (link_rate < limits->min_rate ||
link_rate > limits->max_rate)
continue;
for (lane_count = limits->min_lane_count;
lane_count <= limits->max_lane_count;
lane_count <<= 1) {
const struct drm_display_mode *adjusted_mode =
intel_dp_link_caps_iter_start(&iter, link_caps, order, limits->link_config_filter);
for_each_dp_link_config(&iter, &link_config) {
const struct drm_display_mode *adjusted_mode =
&pipe_config->hw.adjusted_mode;
int mode_rate =
intel_dp_link_required(link_rate, lane_count,
clock, adjusted_mode->hdisplay,
link_bpp_x16, 0);
int mode_rate;
link_avail = intel_dp_max_link_data_rate(intel_dp,
link_rate,
lane_count);
mode_rate = intel_dp_link_required(link_config.rate,
link_config.lane_count,
clock, adjusted_mode->hdisplay,
link_bpp_x16, 0);
if (mode_rate <= link_avail) {
pipe_config->lane_count = lane_count;
pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = link_rate;
link_avail = intel_dp_max_link_data_rate(intel_dp,
link_config.rate,
link_config.lane_count);
return 0;
}
if (mode_rate <= link_avail) {
pipe_config->lane_count = link_config.lane_count;
pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = link_config.rate;
return 0;
}
}
}