[Intel-gfx] [Intel-xe] [PATCH v3 1/6] drm/i915: Initialize dkl_phy spin lock from display code path

[Souza, Jose]

On Tue, 2023-04-11 at 14:20 -0700, Lucas De Marchi wrote:
> On Tue, Apr 11, 2023 at 08:07:12PM +0000, Jose Souza wrote:
> > On Tue, 2023-04-11 at 12:59 -0700, Lucas De Marchi wrote:
> > > On Tue, Apr 11, 2023 at 10:51:04AM -0400, Rodrigo Vivi wrote:
> > > > On Tue, Apr 11, 2023 at 12:14:36PM +0300, Jani Nikula wrote:
> > > > > On Tue, 11 Apr 2023, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> > > > > > On Tue, Apr 11, 2023 at 11:51:33AM +0300, Jani Nikula wrote:
> > > > > > > On Tue, 11 Apr 2023, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> > > > > > > > On Mon, Apr 10, 2023 at 11:32:14AM -0700, José Roberto de Souza wrote:
> > > > > > > > > Start to move the initialization of some lock from
> > > > > > > > > i915_driver_early_probe().
> > > > > > > > > No dkl function is called prior to intel_setup_outputs(), so this is
> > > > > > > > > a good place to initialize it.
> > > > > > > > 
> > > > > > > > I disagree. We don't want to sprinke these all over the place.
> > > > > > > 
> > > > > > > I'm thinking if only foo.c uses a lock, foo.c should initialize it, not
> > > > > > > someone else.
> > > > > > 
> > > > > > Perhaps. But I think there should be some consistent place in the higher
> > > > > > level code where all such things get called instead of dropping each one
> > > > > > individually into some random spot in the overlall display init flow.
> > > > > 
> > > > > Agreed.
> > > > 
> > > > Ops, I just saw this now, right after I cc'ed you in the other thread.
> > > > 
> > > > So, probably good to hold this and do the entire refactor together of all
> > > > those locks initialization so we find this common consistent place apparently...
> > > 
> > > "internal" sw initialization of display-related stuff. It doesn't belong in
> > > i915_driver_early_probe(), it makes harder to follow the sequence if we sprinkle
> > > them around, like here in intel_setup_outputs.
> > > 
> > > But I don't see why this couldn't be done in a higher level "sw
> > > initialization of display-related stuff".  Should we add an equivalent
> > > of i915_driver_early_probe(), e.g.  intel_display_early_probe()[1],  and
> > > move the display-related things from i915_driver_early_probe()?
> > > 
> > > In that case, from xe we would call this function rather than
> > > initializing these fields in xe_display_create()
> > 
> > Sent another version, added intel_display_locks_init() that is called in the beginning of intel_modeset_init_noirq().
> > https://patchwork.freedesktop.org/series/116326/
> 
> modeset? why? That is after we are already probing the hw....

That called during probe, called from i915_driver_probe().

> and what does that have to do with modeset?

The name is misleading but intel_modeset_init_noirq() is the first generic display initialization function called.
There is other display functions called before it but they are very specific(intel_dram_detect(), intel_bw_init_hw() and
intel_device_info_runtime_init()).

> 
> Lucas De Marchi
> 
> > 
> > If this is accepted we can then move the other display locks from i915_driver_early_probe().
> > 
> > > 
> > > Lucas De Marchi
> > > 
> > > [1] I don't like the name, but it follows what is already there
> > > 
> > > > 
> > > > > 
> > > > > --
> > > > > Jani Nikula, Intel Open Source Graphics Center
> >