Re: [PATCH 4/4] drm/i915: fix PCH_NOP setting for non-PCH platforms

[Lucas De Marchi <lucas.de.marchi@gmail.com>]

On Thu, May 31, 2018 at 02:56:24PM +0300, Jani Nikula wrote:
> Setting PCH type to PCH_NOP before checking whether we actually have a
> PCH ends up returning true for HAS_PCH_SPLIT() on all non-PCH split
> platforms. Fix this by using PCH_NOP only for platforms that actually
> have a PCH.
> 
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 1842a067a604..5deee698881b 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -246,14 +246,6 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
>  {
>  	struct pci_dev *pch = NULL;
>  
> -	/* In all current cases, num_pipes is equivalent to the PCH_NOP setting
> -	 * (which really amounts to a PCH but no South Display).
> -	 */
> -	if (INTEL_INFO(dev_priv)->num_pipes == 0) {
> -		dev_priv->pch_type = PCH_NOP;
> -		return;
> -	}
> -
>  	/*
>  	 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
>  	 * make graphics device passthrough work easy for VMM, that only
> @@ -293,6 +285,17 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
>  			break;
>  		}
>  	}
> +
> +	/*
> +	 * Use PCH_NOP (PCH but no South Display) for PCH platforms without

Like I said on patch 1 I'd rather document in the enum what it is and
here just a "Use PCH_NOP for PCH platforms without display"

Lucas De Marchi

> +	 * display.
> +	 */
> +	if (pch && INTEL_INFO(dev_priv)->num_pipes == 0) {
> +		DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
> +		dev_priv->pch_type = PCH_NOP;
> +		dev_priv->pch_id = 0;
> +	}
> +
>  	if (!pch)
>  		DRM_DEBUG_KMS("No PCH found.\n");
>  
> -- 
> 2.11.0
> 
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