[Intel-xe] [Intel-gfx] [PATCH v2 05/27] drm/i915/xe2lpd: Add fake PCH

[Matt Roper]

On Thu, Sep 07, 2023 at 08:37:35AM -0700, Lucas De Marchi wrote:
> From: Gustavo Sousa <gustavo.sousa at intel.com>
> 
> Xe2_LPD has sourth display on the same SOC. As such, define a new fake

s/sourth/south/

You might also want to drop the word "same" from the description here
since NDE and SDE are technically on different dies in this case (NDE is
on the compute die, whereas SDE is on the SoC die).  To be 100% accurate
we'd want to identify SDE behavior via the PICA's GMD_ID (since PICA
also lives on the SoC die for this platform).  But since we've just been
able to get by so far with just matching PICA behavior on the display
version rather than on its own version, we can just use display version
for this as well, at least for now.  We may need to revisit this all
down the road once we have platforms with more possible combinations of
these components.  Of course we really need to rework the SDE handling
in general (and break its assumption that SDE behavior is tied to PCH on
modern platforms), but that's work for a future patch series.

I was originally wondering if we could just reuse PCH_MTP here, but it
looks like there's one place where we setup HPD interrupts that needs
different handling.  So this should be good enough for now, and we can
revisit the whole SDE design separately down the road.

With the minor commit message fix above,

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


> PCH entry for it.
> 
> v2: Match on display IP version rather than on platform (Matt Roper)
> 
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>

> ---
>  drivers/gpu/drm/i915/soc/intel_pch.c | 5 ++++-
>  drivers/gpu/drm/i915/soc/intel_pch.h | 2 ++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/soc/intel_pch.c b/drivers/gpu/drm/i915/soc/intel_pch.c
> index dfffdfa50b97..240beafb38ed 100644
> --- a/drivers/gpu/drm/i915/soc/intel_pch.c
> +++ b/drivers/gpu/drm/i915/soc/intel_pch.c
> @@ -222,7 +222,10 @@ void intel_detect_pch(struct drm_i915_private *dev_priv)
>  	 * South display engine on the same PCI device: just assign the fake
>  	 * PCH.
>  	 */
> -	if (IS_DG2(dev_priv)) {
> +	if (DISPLAY_VER(dev_priv) >= 20) {
> +		dev_priv->pch_type = PCH_LNL;
> +		return;
> +	} else if (IS_DG2(dev_priv)) {
>  		dev_priv->pch_type = PCH_DG2;
>  		return;
>  	} else if (IS_DG1(dev_priv)) {
> diff --git a/drivers/gpu/drm/i915/soc/intel_pch.h b/drivers/gpu/drm/i915/soc/intel_pch.h
> index 32aff5a70d04..1b03ea60a7a8 100644
> --- a/drivers/gpu/drm/i915/soc/intel_pch.h
> +++ b/drivers/gpu/drm/i915/soc/intel_pch.h
> @@ -30,6 +30,7 @@ enum intel_pch {
>  	/* Fake PCHs, functionality handled on the same PCI dev */
>  	PCH_DG1 = 1024,
>  	PCH_DG2,
> +	PCH_LNL,
>  };
>  
>  #define INTEL_PCH_DEVICE_ID_MASK		0xff80
> @@ -66,6 +67,7 @@ enum intel_pch {
>  
>  #define INTEL_PCH_TYPE(dev_priv)		((dev_priv)->pch_type)
>  #define INTEL_PCH_ID(dev_priv)			((dev_priv)->pch_id)
> +#define HAS_PCH_LNL(dev_priv)			(INTEL_PCH_TYPE(dev_priv) == PCH_LNL)
>  #define HAS_PCH_MTP(dev_priv)			(INTEL_PCH_TYPE(dev_priv) == PCH_MTP)
>  #define HAS_PCH_DG2(dev_priv)			(INTEL_PCH_TYPE(dev_priv) == PCH_DG2)
>  #define HAS_PCH_ADP(dev_priv)			(INTEL_PCH_TYPE(dev_priv) == PCH_ADP)
> -- 
> 2.40.1
> 

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