[PATCH v2 2/7] drm/i915: Hook up PIPEDMC interrupts

[Luca Coelho]

On Tue, 2025-05-13 at 16:42 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Hook up PIPEDMC interrupts. We'll need these for:
> - flip queue signalling
> - GTT/ATS faults on LNL+
> - random errors
> 
> On LNL+ we get a new level of interrupts registers PIPEDMC_INTERRUPT*.
> On earlier platforms we only have the INT_VECTOR field in the
> PIPEDMC_STATUS registers, whose values are defined by the firmware.
> 
> For now we'll enable the interrupts on LNL+ only. For earlier platforms
> it's not clear that there is any use for these interrupts, and some
> ADL machines have exhibited spurious DE_PIPE interrupts with the
> PIPEDMC interrupts unmasked/enabled. We can revisit enabling these
> for earlier platforms in the future.
> 
> Similar to DSB interrupt registers, the unused bits in
> PIPEDMC_INTERRUPT* seem to act like randomg r/w bits (instead
> of being hardwired to 0 like one would expect), and so we'll try
> to avoid setting them so that we don't mistake them for real
> interrupts.
> 
> v2: Only enable/unmask for LNL+
>     Keep the flip queue interrupt masked off for now since
>     we don't have a use for it yet
> 
> Reviewed-by: Luca Coelho <luciano.coelho at intel.com> #v1
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---

Renewing my r-b.

Reviewed-by: Luca Coelho <luciano.coelho at intel.com>

--
Cheers,
Luca.