Re: [PATCH v4 4/6] drm/i915/alpm: Add compute config for lobf

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On Thu, 2024-05-09 at 11:01 +0530, Animesh Manna wrote:
> Link Off Between Active Frames, is a new feature for eDP
> that allows the panel to go to lower power state after
> transmission of data. This is a feature on top of ALPM, AS SDP.
> Add compute config during atomic-check phase.
> 
> v1: RFC version.
> v2: Add separate flag for auxless-alpm. [Jani]
> v3:
> - intel_dp->lobf_supported replaced with crtc_state->has_lobf.
> [Jouni]
> - Add DISPLAY_VER() check. [Jouni]
> - Modify function name of get_aux_less_status. [Jani]
> v4: Add enum alpm_mode to hold the aux-wake/less capability.
> 
> Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/display/intel_alpm.c     | 58
> +++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_alpm.h     |  5 ++
>  .../drm/i915/display/intel_display_types.h    | 11 ++++
>  drivers/gpu/drm/i915/display/intel_dp.c       |  4 ++
>  4 files changed, 78 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> b/drivers/gpu/drm/i915/display/intel_alpm.c
> index ee6c2a959f09..5979eab1f2e0 100644
> --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> @@ -11,6 +11,23 @@
>  #include "intel_dp_aux.h"
>  #include "intel_psr_regs.h"
>  
> +enum alpm_mode intel_alpm_get_capability(struct intel_dp *intel_dp)
> +{
> +       u8 alpm_caps = 0;
> +
> +       if (drm_dp_dpcd_readb(&intel_dp->aux, DP_RECEIVER_ALPM_CAP,
> +                             &alpm_caps) != 1)
> +               return ALPM_INVALID;
> +
> +       if (alpm_caps & DP_ALPM_CAP)
> +               return ALPM_AUX_WAKE;
> +
> +       if (alpm_caps & DP_ALPM_AUX_LESS_CAP)
> +               return ALPM_AUX_LESS;
> +
> +       return ALPM_NOT_SUPPORTED;
> +}

This will always return ALPM_AUX_WAKE if both are supported. I don't
think this is what you want?

You could add alpm_dpcd into intel_dp. Then for this purpose add
aux_wake_supported() and aux_less_wake_supported()?

BR,

Jouni Högander

> +
>  /*
>   * See Bspec: 71632 for the table
>   *
> @@ -242,6 +259,47 @@ bool intel_alpm_compute_params(struct intel_dp
> *intel_dp,
>         return true;
>  }
>  
> +void intel_alpm_compute_lobf_config(struct intel_dp *intel_dp,
> +                                   struct intel_crtc_state
> *crtc_state,
> +                                   struct drm_connector_state
> *conn_state)
> +{
> +       struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> +       struct drm_display_mode *adjusted_mode = &crtc_state-
> >hw.adjusted_mode;
> +       int waketime_in_lines, first_sdp_position;
> +       int context_latency, guardband;
> +
> +       if (!intel_dp_is_edp(intel_dp))
> +               return;
> +
> +       if (DISPLAY_VER(i915) < 20)
> +               return;
> +
> +       if (!intel_dp_as_sdp_supported(intel_dp))
> +               return;
> +
> +       if (crtc_state->has_psr)
> +               return;
> +
> +       if (intel_dp->alpm_parameters.mode == ALPM_INVALID ||
> +           intel_dp->alpm_parameters.mode == ALPM_NOT_SUPPORTED)
> +               return;
> +
> +       if (!intel_alpm_compute_params(intel_dp, crtc_state))
> +               return;
> +
> +       context_latency = adjusted_mode->crtc_vblank_start -
> adjusted_mode->crtc_vdisplay;
> +       guardband = adjusted_mode->crtc_vtotal -
> +                   adjusted_mode->crtc_vdisplay - context_latency;
> +       first_sdp_position = adjusted_mode->crtc_vtotal -
> adjusted_mode->crtc_vsync_start;
> +       if (intel_dp->alpm_parameters.mode == ALPM_AUX_LESS)
> +               waketime_in_lines = intel_dp-
> >alpm_parameters.io_wake_lines;
> +       else
> +               waketime_in_lines = intel_dp-
> >alpm_parameters.fast_wake_lines;
> +
> +       crtc_state->has_lobf = (context_latency + guardband) >
> +               (first_sdp_position + waketime_in_lines);
> +}
> +
>  static void lnl_alpm_configure(struct intel_dp *intel_dp)
>  {
>         struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h
> b/drivers/gpu/drm/i915/display/intel_alpm.h
> index c45d078e5a6b..80c8a66b34af 100644
> --- a/drivers/gpu/drm/i915/display/intel_alpm.h
> +++ b/drivers/gpu/drm/i915/display/intel_alpm.h
> @@ -10,9 +10,14 @@
>  
>  struct intel_dp;
>  struct intel_crtc_state;
> +struct drm_connector_state;
>  
> +enum alpm_mode intel_alpm_get_capability(struct intel_dp *intel_dp);
>  bool intel_alpm_compute_params(struct intel_dp *intel_dp,
>                                struct intel_crtc_state *crtc_state);
> +void intel_alpm_compute_lobf_config(struct intel_dp *intel_dp,
> +                                   struct intel_crtc_state
> *crtc_state,
> +                                   struct drm_connector_state
> *conn_state);
>  void intel_alpm_configure(struct intel_dp *intel_dp);
>  
>  #endif
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index e81fd71ce57b..79e9e543020b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1405,6 +1405,9 @@ struct intel_crtc_state {
>  
>         /* for loading single buffered registers during vblank */
>         struct drm_vblank_work vblank_work;
> +
> +       /* LOBF flag */
> +       bool has_lobf;
>  };
>  
>  enum intel_pipe_crc_source {
> @@ -1715,6 +1718,13 @@ struct intel_psr {
>         u8 entry_setup_frames;
>  };
>  
> +enum alpm_mode {
> +       ALPM_INVALID,
> +       ALPM_AUX_WAKE,
> +       ALPM_AUX_LESS,
> +       ALPM_NOT_SUPPORTED
> +};
> +
>  struct intel_dp {
>         i915_reg_t output_reg;
>         u32 DP;
> @@ -1835,6 +1845,7 @@ struct intel_dp {
>                 u8 fast_wake_lines;
>  
>                 /* LNL and beyond */
> +               enum alpm_mode mode;
>                 u8 check_entry_lines;
>                 u8 silence_period_sym_clocks;
>                 u8 lfps_half_cycle_num_of_syms;
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index 486361eb0070..df423a33f6fc 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -48,6 +48,7 @@
>  #include "i915_drv.h"
>  #include "i915_irq.h"
>  #include "i915_reg.h"
> +#include "intel_alpm.h"
>  #include "intel_atomic.h"
>  #include "intel_audio.h"
>  #include "intel_backlight.h"
> @@ -3000,6 +3001,7 @@ intel_dp_compute_config(struct intel_encoder
> *encoder,
>         intel_vrr_compute_config(pipe_config, conn_state);
>         intel_dp_compute_as_sdp(intel_dp, pipe_config);
>         intel_psr_compute_config(intel_dp, pipe_config, conn_state);
> +       intel_alpm_compute_lobf_config(intel_dp, pipe_config,
> conn_state);
>         intel_dp_drrs_compute_config(connector, pipe_config,
> link_bpp_x16);
>         intel_dp_compute_vsc_sdp(intel_dp, pipe_config, conn_state);
>         intel_dp_compute_hdr_metadata_infoframe_sdp(intel_dp,
> pipe_config, conn_state);
> @@ -6615,6 +6617,8 @@ static bool intel_edp_init_connector(struct
> intel_dp *intel_dp,
>  
>         intel_pps_init_late(intel_dp);
>  
> +       intel_dp->alpm_parameters.mode =
> intel_alpm_get_capability(intel_dp);
> +
>         return true;
>  
>  out_vdd_off:





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