[PATCH v6 5/8] drm/i915/lobf: Add debug interface for lobf

[Manna, Animesh]

> -----Original Message-----
> From: Hogander, Jouni <jouni.hogander at intel.com>
> Sent: Monday, March 24, 2025 1:38 PM
> To: intel-xe at lists.freedesktop.org; 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 v6 5/8] drm/i915/lobf: Add debug interface for lobf
> 
> On Thu, 2025-03-20 at 00:45 +0530, Animesh Manna wrote:
> > Add an interface in debugfs which will help in debugging LOBF feature.
> >
> > v1: Initial version.
> > v2:
> > - Remove FORCE_EN flag. [Jouni]
> > - Change prefix from I915 to INTEL. [Jani]
> > - Use u8 instead of bool for lobf-debug flag. [Jani]
> > v3:
> > - Use intel_connector instead of display. [Jani]
> > - Remove edp connector check as it was already present in caller
> > function. [Jani]
> > - Remove loop of searching edp encoder which is directly accessible
> > from intel_connector. [Jani]
> > v4:
> > - Simplify alpm debug to bool instead of bit-mask. [Jani]
> >
> > Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_alpm.c     | 32
> > +++++++++++++++++++
> >  .../drm/i915/display/intel_display_types.h    |  1 +
> >  2 files changed, 33 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> > b/drivers/gpu/drm/i915/display/intel_alpm.c
> > index 5df1253a6b6c..dc24772743b8 100644
> > --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> > +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> > @@ -276,6 +276,9 @@ void intel_alpm_lobf_compute_config(struct
> > intel_dp *intel_dp,
> >  	int waketime_in_lines, first_sdp_position;
> >  	int context_latency, guardband;
> >
> > +	if (intel_dp->alpm_parameters.lobf_enable_debug)
> 
> *_disable_* would be more self-explanatory

Sure, will add.

Regards,
Animesh

> 
> BR,
> 
> Jouni Högander
> 
> > +		return;
> > +
> >  	if (!intel_dp_is_edp(intel_dp))
> >  		return;
> >
> > @@ -436,6 +439,32 @@ static int i915_edp_lobf_info_show(struct
> > seq_file *m, void *data)
> >
> >  DEFINE_SHOW_ATTRIBUTE(i915_edp_lobf_info);
> >
> > +static int
> > +i915_edp_lobf_debug_get(void *data, u64 *val) {
> > +	struct intel_connector *connector = data;
> > +	struct intel_dp *intel_dp = enc_to_intel_dp(connector-
> > >encoder);
> > +
> > +	*val = READ_ONCE(intel_dp-
> > >alpm_parameters.lobf_enable_debug);
> > +
> > +	return 0;
> > +}
> > +
> > +static int
> > +i915_edp_lobf_debug_set(void *data, u64 val) {
> > +	struct intel_connector *connector = data;
> > +	struct intel_dp *intel_dp = enc_to_intel_dp(connector-
> > >encoder);
> > +
> > +	intel_dp->alpm_parameters.lobf_enable_debug = val;
> > +
> > +	return 0;
> > +}
> > +
> > +DEFINE_SIMPLE_ATTRIBUTE(i915_edp_lobf_debug_fops,
> > +			i915_edp_lobf_debug_get,
> > i915_edp_lobf_debug_set,
> > +			"%llu\n");
> > +
> >  void intel_alpm_lobf_debugfs_add(struct intel_connector *connector)
> >  {
> >  	struct intel_display *display = to_intel_display(connector); @@
> > -445,6 +474,9 @@ void intel_alpm_lobf_debugfs_add(struct
> > intel_connector *connector)
> >  	    connector->base.connector_type !=
> > DRM_MODE_CONNECTOR_eDP)
> >  		return;
> >
> > +	debugfs_create_file("i915_edp_lobf_debug", 0644, root,
> > +			    connector, &i915_edp_lobf_debug_fops);
> > +
> >  	debugfs_create_file("i915_edp_lobf_info", 0444, root,
> >  			    connector, &i915_edp_lobf_info_fops);
> >  }
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> > b/drivers/gpu/drm/i915/display/intel_display_types.h
> > index bef54b23273f..0b109aac5306 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > @@ -1812,6 +1812,7 @@ struct intel_dp {
> >  		u8 aux_less_wake_lines;
> >  		u8 silence_period_sym_clocks;
> >  		u8 lfps_half_cycle_num_of_syms;
> > +		bool lobf_enable_debug;
> >  	} alpm_parameters;
> >
> >  	u8 alpm_dpcd;