[PATCH 2/2] drm/i915/display: Print PICA version

[Matt Roper]

On Fri, Dec 08, 2023 at 01:46:09PM -0600, Lucas De Marchi wrote:
> On Fri, Dec 08, 2023 at 10:02:53AM -0800, Matt Roper wrote:
> > On Fri, Dec 08, 2023 at 06:31:37AM -0800, Lucas De Marchi wrote:
> > > The PICA_DEVICE_ID follows the same format as other GMD_ID registers
> > > (graphics, display and media). Currently the only use for it is
> > > informational for developers while checking the differences between
> > > machines with the same platform. Print the raw number as there's no need
> > > for the driver to check any of the fields.
> > > 
> > > In future this may change, but then the IP version in
> > > struct intel_display_runtime_info will need some refactor to allow
> > > keeping both the display engine and PICA versions.
> > > 
> > > Lastly, keeping the PICA version around in the display runtime info
> > > matches its current use. If that changes in future, then it may need
> > > to be moved to the device info.
> > > 
> > > Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/display/intel_display_device.c | 5 +++++
> > >  drivers/gpu/drm/i915/display/intel_display_device.h | 2 ++
> > >  drivers/gpu/drm/i915/i915_reg.h                     | 2 ++
> > >  3 files changed, 9 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
> > > index 5d1084a98b93..d9d1be008e4c 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_display_device.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_display_device.c
> > > @@ -956,6 +956,9 @@ static void __intel_display_device_info_runtime_init(struct drm_i915_private *i9
> > >  	BUILD_BUG_ON(BITS_PER_TYPE(display_runtime->cpu_transcoder_mask) < I915_MAX_TRANSCODERS);
> > >  	BUILD_BUG_ON(BITS_PER_TYPE(display_runtime->port_mask) < I915_MAX_PORTS);
> > > 
> > > +	if (HAS_GMD_ID(i915))
> > > +		display_runtime->pica_id = intel_de_read(i915, PICA_DEVICE_ID);
> > > +
> > >  	/* This covers both ULT and ULX */
> > >  	if (IS_HASWELL_ULT(i915) || IS_BROADWELL_ULT(i915))
> > >  		display_runtime->port_mask &= ~BIT(PORT_D);
> > > @@ -1124,6 +1127,8 @@ void intel_display_device_info_print(const struct intel_display_device_info *inf
> > >  {
> > >  	drm_printf(p, "display version: %u.%02u.%02u\n",
> > >  		   runtime->ip.ver, runtime->ip.rel, runtime->ip.step);
> > > +	if (runtime->pica_id)
> > > +		drm_printf(p, "PICA version: %#08x\n", runtime->pica_id);
> > 
> > The actual, expected PICA version number on most (all?) MTL devices will
> > be 0.0.  Should we make the condition here HAS_GMD_ID(i915) instead so
> > that we print the value whenever we read it?  That will also help us
> > notice if the PICA register is incorrectly 0 on LNL or later platforms
> > where it should have been non-zero.
> 
> it seems intel_display_device_info_print() was specially crafted so we
> don't have the i915/xe pointer and instead only operate on the info.
> Yeah, we can get back to i915/xe, but I'm not sure about doing that.
> 
> What if we initialize it with U32_MAX and check for it here. I think it
> would take a long time before that becomes invalid.
> 
> Another option is not to bother with the additional message in platforms
> without it, and just print it unconditionally, like patch 1 does for the
> rel/step.
> 
> Thoughts?

Hmm.  Maybe just printing it unconditionally would be fine.  Or just
leaving it as you have here and only printing non-zero values is
probably fine too.  Either way,

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>


> 
> Lucas De Marchi
> 
> > 
> > 
> > Matt
> > 
> > > 
> > >  #define PRINT_FLAG(name) drm_printf(p, "%s: %s\n", #name, str_yes_no(info->name))
> > >  	DEV_INFO_DISPLAY_FOR_EACH_FLAG(PRINT_FLAG);
> > > diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
> > > index 79e9f1c3e241..f8a2ada1a4ec 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_display_device.h
> > > +++ b/drivers/gpu/drm/i915/display/intel_display_device.h
> > > @@ -123,6 +123,8 @@ struct intel_display_runtime_info {
> > > 
> > >  	u8 fbc_mask;
> > > 
> > > +	u32 pica_id;
> > > +
> > >  	bool has_hdcp;
> > >  	bool has_dmc;
> > >  	bool has_dsc;
> > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > index 27dc903f0553..9d70635508ae 100644
> > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > @@ -6362,6 +6362,8 @@ enum skl_power_gate {
> > >  #define  TCSS_DDI_STATUS_HPD_LIVE_STATUS_TBT	REG_BIT(1)
> > >  #define  TCSS_DDI_STATUS_HPD_LIVE_STATUS_ALT	REG_BIT(0)
> > > 
> > > +#define PICA_DEVICE_ID				_MMIO(0x16fe00)
> > > +
> > >  #define PRIMARY_SPI_TRIGGER			_MMIO(0x102040)
> > >  #define PRIMARY_SPI_ADDRESS			_MMIO(0x102080)
> > >  #define PRIMARY_SPI_REGIONID			_MMIO(0x102084)
> > > --
> > > 2.40.1
> > > 
> > 
> > -- 
> > Matt Roper
> > Graphics Software Engineer
> > Linux GPU Platform Enablement
> > Intel Corporation

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation