Calculate scaler prefill latency which accounts for time for each scaler in pipeline.
Signed-off-by: Mitul Golani <[email protected]> --- drivers/gpu/drm/i915/display/skl_scaler.c | 39 +++++++++++++++++++++++ drivers/gpu/drm/i915/display/skl_scaler.h | 1 + 2 files changed, 40 insertions(+) diff --git a/drivers/gpu/drm/i915/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c index 7dbc99b02eaa..eec4a5f783fa 100644 --- a/drivers/gpu/drm/i915/display/skl_scaler.c +++ b/drivers/gpu/drm/i915/display/skl_scaler.c @@ -6,6 +6,7 @@ #include "i915_reg.h" #include "intel_de.h" #include "intel_display_types.h" +#include "intel_crtc.h" #include "intel_fb.h" #include "skl_scaler.h" #include "skl_universal_plane.h" @@ -839,3 +840,41 @@ void skl_scaler_get_config(struct intel_crtc_state *crtc_state) else scaler_state->scaler_users &= ~(1 << SKL_CRTC_INDEX); } + +int skl_calc_scaler_prefill_latency(struct intel_crtc_state *crtc_state) +{ + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); + struct intel_plane *plane = to_intel_plane(crtc->base.primary); + const struct intel_plane_state *plane_state = to_intel_plane_state(plane->base.state); + struct intel_crtc_scaler_state *scaler_state = &crtc_state->scaler_state; + int scaler_prefill_latency[2]; + int num_scaler_in_use, count, hscale, vscale, tot_scaler_prefill_usec; + int hscan_time = DIV_ROUND_UP(crtc_state->hw.adjusted_mode.htotal * 1000, + crtc_state->hw.adjusted_mode.crtc_clock); + + for (count = 0; count < crtc->num_scalers; count++) + if (scaler_state->scalers[count].in_use) + num_scaler_in_use++; + + if (!num_scaler_in_use) + return 0; + + if (num_scaler_in_use == 2) { + hscale = drm_rect_calc_hscale(&plane_state->uapi.src, + &plane_state->uapi.dst, + 0, INT_MAX); + vscale = drm_rect_calc_vscale(&plane_state->uapi.src, + &plane_state->uapi.dst, + 0, INT_MAX); + scaler_prefill_latency[1] = 4 * hscan_time * hscale * vscale; + } + + /* + * FIXME : When only 1 scaler used, 1st scaler can be downscale/upscale + */ + scaler_prefill_latency[0] = 4 * hscan_time; + tot_scaler_prefill_usec = scaler_prefill_latency[0] + scaler_prefill_latency[1]; + + return intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode, + tot_scaler_prefill_usec); +} diff --git a/drivers/gpu/drm/i915/display/skl_scaler.h b/drivers/gpu/drm/i915/display/skl_scaler.h index 63f93ca03c89..cd4d961d3b02 100644 --- a/drivers/gpu/drm/i915/display/skl_scaler.h +++ b/drivers/gpu/drm/i915/display/skl_scaler.h @@ -34,4 +34,5 @@ void skl_scaler_disable(const struct intel_crtc_state *old_crtc_state); void skl_scaler_get_config(struct intel_crtc_state *crtc_state); +int skl_calc_scaler_prefill_latency(struct intel_crtc_state *crtc_state); #endif -- 2.46.0
