[Intel-xe] [PATCH 29/42] drm/i915/xe2lpd: Add support for HPD

[Matt Roper]

On Wed, Aug 23, 2023 at 10:07:27AM -0700, Lucas De Marchi wrote:
> From: Gustavo Sousa <gustavo.sousa at intel.com>
> 
> Hotplug setup for Xe2_LPD differs from Xe_LPD+ by the fact that the
> extra programming for hotplug inversion and DDI HPD filter duration is
> not necessary anymore. As mtp_hpd_irq_setup() is reasonably small,
> prefer to fork it into a new function for Xe2_LPD instead of adding a
> platform check.
> 
> BSpec: 68970

It might be worth adding 69940 to the list here, since that's useful for
confirming the hpd pin => bit mapping.

> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  .../gpu/drm/i915/display/intel_hotplug_irq.c  | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c
> index f76b9deb64b4..74aea0d8d9ae 100644
> --- a/drivers/gpu/drm/i915/display/intel_hotplug_irq.c
> +++ b/drivers/gpu/drm/i915/display/intel_hotplug_irq.c
> @@ -163,7 +163,9 @@ static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
>  	    (!HAS_PCH_SPLIT(dev_priv) || HAS_PCH_NOP(dev_priv)))
>  		return;
>  
> -	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
> +	if (INTEL_PCH_TYPE(dev_priv) >= PCH_LNL)
> +		hpd->pch_hpd = hpd_mtp;
> +	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
>  		hpd->pch_hpd = hpd_sde_dg1;
>  	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_MTP)
>  		hpd->pch_hpd = hpd_mtp;
> @@ -1061,6 +1063,19 @@ static void mtp_hpd_irq_setup(struct drm_i915_private *i915)
>  	mtp_tc_hpd_detection_setup(i915);
>  }
>  
> +static void xe2lpd_sde_hpd_irq_setup(struct drm_i915_private *i915)
> +{
> +	u32 hotplug_irqs, enabled_irqs;
> +
> +	enabled_irqs = intel_hpd_enabled_irqs(i915, i915->display.hotplug.pch_hpd);
> +	hotplug_irqs = intel_hpd_hotplug_irqs(i915, i915->display.hotplug.pch_hpd);
> +
> +	ibx_display_interrupt_update(i915, hotplug_irqs, enabled_irqs);
> +
> +	mtp_ddi_hpd_detection_setup(i915);
> +	mtp_tc_hpd_detection_setup(i915);
> +}
> +
>  static bool is_xelpdp_pica_hpd_pin(enum hpd_pin hpd_pin)
>  {
>  	return hpd_pin >= HPD_PORT_TC1 && hpd_pin <= HPD_PORT_TC4;
> @@ -1120,6 +1135,8 @@ static void xelpdp_hpd_irq_setup(struct drm_i915_private *i915)
>  
>  	xelpdp_pica_hpd_detection_setup(i915);
>  
> +	if (INTEL_PCH_TYPE(i915) >= PCH_LNL)
> +		xe2lpd_sde_hpd_irq_setup(i915);
>  	if (INTEL_PCH_TYPE(i915) >= PCH_MTP)

I think we want an 'else if' here.


Matt

>  		mtp_hpd_irq_setup(i915);
>  }
> -- 
> 2.40.1
> 

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