[PATCH v2 1/2] drm/i915/lobf: Add lobf enablement in post plane update

[Manna, Animesh]

> -----Original Message-----
> From: Hogander, Jouni <jouni.hogander at intel.com>
> Sent: Monday, December 9, 2024 2:06 PM
> To: Manna, Animesh <animesh.manna at intel.com>; intel-
> gfx at lists.freedesktop.org
> Cc: Nikula, Jani <jani.nikula at intel.com>; B, Jeevan <jeevan.b at intel.com>
> Subject: Re: [PATCH v2 1/2] drm/i915/lobf: Add lobf enablement in post
> plane update
> 
> On Wed, 2024-12-04 at 15:33 +0530, Animesh Manna wrote:
> > Enablement of LOBF is added in post plane update whenever has_lobf
> > flag is set. As LOBF can be enabled in non-psr case as well so adding
> > in post plane update. There is no change of configuring alpm with psr
> > path.
> >
> > v1: Initial version.
> > v2: Use encoder-mask to find the associated encoder from crtc-state.
> > [Jani]
> >
> > Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_alpm.c    | 25
> > ++++++++++++++++++++
> >  drivers/gpu/drm/i915/display/intel_alpm.h    |  4 ++++
> >  drivers/gpu/drm/i915/display/intel_display.c |  3 +++
> >  3 files changed, 32 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> > b/drivers/gpu/drm/i915/display/intel_alpm.c
> > index 55f3ae1e68c9..75063342a100 100644
> > --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> > +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> > @@ -367,6 +367,31 @@ void intel_alpm_configure(struct intel_dp
> > *intel_dp,
> >         lnl_alpm_configure(intel_dp, crtc_state);
> >  }
> >
> > +void intel_alpm_post_plane_update(struct intel_atomic_state *state,
> > +                                 struct intel_crtc *crtc) {
> > +       struct intel_display *display = to_intel_display(state);
> > +       const struct intel_crtc_state *crtc_state =
> > +               intel_atomic_get_new_crtc_state(state, crtc);
> > +       struct intel_encoder *encoder;
> > +
> > +       if (!crtc_state->has_lobf)
> > +               return;
> > +
> > +       for_each_intel_encoder_mask(display->drm, encoder,
> > +                                   crtc_state->uapi.encoder_mask) {
> > +               struct intel_dp *intel_dp;
> > +
> > +               if (!intel_encoder_is_dp(encoder))
> > +                       continue;
> > +
> > +               intel_dp = enc_to_intel_dp(encoder);
> > +
> > +               if (intel_dp_is_edp(intel_dp))
> > +                       intel_alpm_configure(intel_dp, crtc_state);
> 
> This is reconfiguring lobf even if it's already configured? Is that wanted?

has_psr and has_lobf are mutually exclusive, so alpm_configure() will be called once.

Regards,
Animesh
 
> 
> BR,
> 
> Jouni Högander
> > +       }
> > +}
> > +
> >  static int i915_edp_lobf_info_show(struct seq_file *m, void *data)
> >  {
> >         struct intel_connector *connector = m->private; diff --git
> > a/drivers/gpu/drm/i915/display/intel_alpm.h
> > b/drivers/gpu/drm/i915/display/intel_alpm.h
> > index 8c409b10dce6..2f862b0476a8 100644
> > --- a/drivers/gpu/drm/i915/display/intel_alpm.h
> > +++ b/drivers/gpu/drm/i915/display/intel_alpm.h
> > @@ -12,6 +12,8 @@ struct intel_dp;
> >  struct intel_crtc_state;
> >  struct drm_connector_state;
> >  struct intel_connector;
> > +struct intel_atomic_state;
> > +struct intel_crtc;
> >
> >  void intel_alpm_init_dpcd(struct intel_dp *intel_dp);
> >  bool intel_alpm_compute_params(struct intel_dp *intel_dp, @@ -21,6
> > +23,8 @@ void intel_alpm_lobf_compute_config(struct intel_dp
> > *intel_dp,
> >                                     struct drm_connector_state
> > *conn_state);
> >  void intel_alpm_configure(struct intel_dp *intel_dp,
> >                           const struct intel_crtc_state *crtc_state);
> > +void intel_alpm_post_plane_update(struct intel_atomic_state *state,
> > +                                 struct intel_crtc *crtc);
> >  void intel_alpm_lobf_debugfs_add(struct intel_connector *connector);
> >  bool intel_alpm_aux_wake_supported(struct intel_dp *intel_dp);
> >  bool intel_alpm_aux_less_wake_supported(struct intel_dp *intel_dp);
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > b/drivers/gpu/drm/i915/display/intel_display.c
> > index 4805bf682d43..ffd96b187e5e 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -55,6 +55,7 @@
> >  #include "i9xx_plane.h"
> >  #include "i9xx_plane_regs.h"
> >  #include "i9xx_wm.h"
> > +#include "intel_alpm.h"
> >  #include "intel_atomic.h"
> >  #include "intel_atomic_plane.h"
> >  #include "intel_audio.h"
> > @@ -1190,6 +1191,8 @@ static void intel_post_plane_update(struct
> > intel_atomic_state *state,
> >
> >         intel_psr_post_plane_update(state, crtc);
> >
> > +       intel_alpm_post_plane_update(state, crtc);
> > +
> >         intel_frontbuffer_flip(dev_priv, new_crtc_state->fb_bits);
> >
> >         if (new_crtc_state->update_wm_post && new_crtc_state-
> > >hw.active)