[PATCH] drm/i915/psr: Implment WA to help reach PC10
Ville Syrjälä
ville.syrjala at linux.intel.com
Mon Sep 9 14:12:06 UTC 2024
On Tue, Sep 03, 2024 at 01:54:50PM +0530, Suraj Kandpal wrote:
> To reach PC10 when PKG_C_LATENCY is configure we must do the following
> things
> 1) Enter PSR1 only when delayed_vblank < 6 lines and DC5 can be entered
> 2) Allow PSR2 deep sleep when DC5 can be entered
> 3) DC5 can be entered when all transocoder have either PSR1, PSR2 or
> eDP 1.5 PR ALPM enabled and VBI is disabled and flips and pushes are
> not happening.
>
> --v2
> -Switch condition and do an early return [Jani]
> -Do some checks in compute_config [Jani]
> -Do not use register reads as a method of checking states for
> DPKGC or delayed vblank [Jani]
> -Use another way to see is vblank interrupts are disabled or not [Jani]
>
> --v3
> -Use has_psr to check if psr can be enabled or not for dc5_entry cond
> [Uma]
> -Move the dc5 entry computation to psr_compute_config [Jouni]
> -No need to change sequence of enabled and activate,
> so dont make hsw_psr1_activate return anything [Jouni]
> -Use has_psr to stop psr1 activation [Jouni]
> -Use lineage no. in WA
> -Add the display ver restrictions for WA
>
> --v4
> -use more appropriate name for check_vblank_limit() [Jouni]
> -Cover the case for idle frames when dpkgc is not configured [Jouni]
> -Check psr only for edp [Jouni]
>
> WA: 22019444797
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---
> .../drm/i915/display/intel_display_types.h | 2 +
> drivers/gpu/drm/i915/display/intel_psr.c | 101 +++++++++++++++++-
> 2 files changed, 102 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index fa03157554b2..6b95a59aba2e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1717,6 +1717,8 @@ struct intel_psr {
> bool sink_support;
> bool source_support;
> bool enabled;
> + bool is_dpkgc_configured;
> + bool is_dc5_entry_possible;
> bool paused;
> enum pipe pipe;
> enum transcoder transcoder;
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 257526362b39..6eb137ecd49f 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -870,6 +870,74 @@ static u8 psr_compute_idle_frames(struct intel_dp *intel_dp)
> return idle_frames;
> }
>
> +static bool intel_psr_check_wa_delayed_vblank(struct intel_crtc_state *crtc_state)
> +{
> + struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
> +
> + return (adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay) >= 6;
> +}
> +
> +/*
> + * PKG_C_LATENCY is configured only when DISPLAY_VER >= 20 and
> + * VRR is not enabled
> + */
> +static bool intel_psr_is_dpkgc_configured(struct drm_i915_private *i915)
> +{
> + struct intel_crtc *intel_crtc;
> +
> + if (DISPLAY_VER(i915) < 20)
> + return false;
> +
> + for_each_intel_crtc(&i915->drm, intel_crtc) {
> + struct intel_crtc_state *crtc_state;
> +
> + if (!intel_crtc->active)
> + continue;
> +
> + crtc_state = intel_crtc->config;
We are trying to remove all that old junk. Please do not use.
> +
> + if (crtc_state->vrr.enable)
> + return false;
> + }
> +
> + return true;
> +}
> +
> +/*
> + * DC5 entry is only possible if vblank interrupt is disabled
> + * and either psr1, psr2, edp 1.5 pr alpm is enabled on all
> + * enabled encoders.
> + */
> +static bool
> +intel_psr_is_dc5_entry_possible(struct drm_i915_private *i915,
> + struct intel_crtc_state *crtc_state)
> +{
> + struct intel_crtc *intel_crtc;
> +
> + if (!crtc_state->has_psr)
> + return false;
> +
> + for_each_intel_crtc(&i915->drm, intel_crtc) {
> + struct drm_crtc *crtc = &intel_crtc->base;
> + struct drm_vblank_crtc *vblank;
> + struct intel_encoder *encoder;
> +
> + if (!intel_crtc->active)
> + continue;
> +
> + vblank = drm_crtc_vblank_crtc(crtc);
> +
> + if (vblank->enabled)
> + return false;
> +
> + for_each_encoder_on_crtc(&i915->drm, crtc, encoder)
> + if (encoder->type != INTEL_OUTPUT_EDP)
> + return false;
> + }
> +
> + return true;
> +}
> +
> static void hsw_activate_psr1(struct intel_dp *intel_dp)
> {
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> @@ -980,7 +1048,11 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
> u32 val = EDP_PSR2_ENABLE;
> u32 psr_val = 0;
>
> - val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp));
> + /* Wa_22019444797 */
> + if (DISPLAY_VER(dev_priv) != 20 ||
> + !intel_dp->psr.is_dpkgc_configured ||
> + intel_dp->psr.is_dc5_entry_possible)
> + val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp));
>
> if (DISPLAY_VER(dev_priv) < 14 && !IS_ALDERLAKE_P(dev_priv))
> val |= EDP_SU_TRACK_ENABLE;
> @@ -1595,6 +1667,32 @@ _panel_replay_compute_config(struct intel_dp *intel_dp,
> return true;
> }
>
> +static void wa_22019444797(struct intel_dp *intel_dp,
> + struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +
> + if (DISPLAY_VER(i915) != 20)
> + return;
> +
> + intel_dp->psr.is_dpkgc_configured =
> + intel_psr_is_dpkgc_configured(i915);
> + intel_dp->psr.is_dc5_entry_possible =
> + intel_psr_is_dc5_entry_possible(i915, crtc_state);
> +
> + /* PSR2 not handled here. Wa not needed for Panel Replay */
> + if (crtc_state->has_sel_update || crtc_state->has_panel_replay)
> + return;
> +
> + if (intel_dp->psr.is_dpkgc_configured &&
> + !(intel_psr_check_wa_delayed_vblank(crtc_state) ||
> + intel_dp->psr.is_dc5_entry_possible)) {
> + drm_dbg_kms(&i915->drm,
> + "PSR1 not enabled as it doesn't meet requirements of WA: 22019444797\n");
> + crtc_state->has_psr = false;
> + }
> +}
> +
> void intel_psr_compute_config(struct intel_dp *intel_dp,
> struct intel_crtc_state *crtc_state,
> struct drm_connector_state *conn_state)
> @@ -1641,6 +1739,7 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
> return;
>
> crtc_state->has_sel_update = intel_sel_update_config_valid(intel_dp, crtc_state);
> + wa_22019444797(intel_dp, crtc_state);
> }
>
> void intel_psr_get_config(struct intel_encoder *encoder,
> --
> 2.43.2
--
Ville Syrjälä
Intel
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