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drm/i915/dp: Add a separate function to reduce the link parameters

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A follow-up patch will add an alternative way to reduce the link
parameters in BW order on MST links, prepare for that here.

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-8-imre.deak@intel.com
This commit is contained in:
Imre Deak 2024-07-22 19:54:56 +03:00
parent a4530e20fa
commit 634e180424
1 changed files with 31 additions and 8 deletions
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39
drivers/gpu/drm/i915/display/intel_dp_link_training.c
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@ -1193,6 +1193,36 @@ static int reduce_lane_count(struct intel_dp *intel_dp, int current_lane_count)
return current_lane_count >> 1;
}
static bool reduce_link_params_in_rate_lane_order(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state,
int *new_link_rate, int *new_lane_count)
{
int link_rate;
int lane_count;
lane_count = crtc_state->lane_count;
link_rate = reduce_link_rate(intel_dp, crtc_state->port_clock);
if (link_rate < 0) {
lane_count = reduce_lane_count(intel_dp, crtc_state->lane_count);
link_rate = intel_dp_max_common_rate(intel_dp);
}
if (lane_count < 0)
return false;
*new_link_rate = link_rate;
*new_lane_count = lane_count;
return true;
}
static bool reduce_link_params(struct intel_dp *intel_dp, const struct intel_crtc_state *crtc_state,
int *new_link_rate, int *new_lane_count)
{
return reduce_link_params_in_rate_lane_order(intel_dp, crtc_state,
new_link_rate, new_lane_count);
}
static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state)
{
@ -1206,14 +1236,7 @@ static int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
return 0;
}
new_lane_count = crtc_state->lane_count;
new_link_rate = reduce_link_rate(intel_dp, crtc_state->port_clock);
if (new_link_rate < 0) {
new_lane_count = reduce_lane_count(intel_dp, crtc_state->lane_count);
new_link_rate = intel_dp_max_common_rate(intel_dp);
}
if (new_lane_count < 0)
if (!reduce_link_params(intel_dp, crtc_state, &new_link_rate, &new_lane_count))
return -1;
if (intel_dp_is_edp(intel_dp) &&