[Intel-gfx] [PATCH] drm/i915/hotplug: Use phy to get the hpd_pin instead of the port (v2)

[Souza, Jose]

On Thu, 2020-01-30 at 14:43 -0800, Vivek Kasireddy wrote:
> On some platforms such as Elkhart Lake, although we may use DDI D
> to drive a connector, we have to use PHY A (Combo Phy PORT A) to
> detect the hotplug interrupts as per the spec because there is no
> one-to-one mapping between DDIs and PHYs. Therefore, use the
> function intel_port_to_phy() which contains the logic for such
> mapping(s) to find the correct hpd_pin.
> 
> This change should not affect other platforms as there is always
> a one-to-one mapping between DDIs and PHYs.
> 
> v2:
> - Convert the case statements to use PHYs instead of PORTs (Jani)
> 
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_hotplug.c | 24 +++++++++++-------
> --
>  1 file changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c
> b/drivers/gpu/drm/i915/display/intel_hotplug.c
> index 042d98bae1ea..2bcfa4682511 100644
> --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> @@ -89,29 +89,31 @@
>  enum hpd_pin intel_hpd_pin_default(struct drm_i915_private
> *dev_priv,
>  				   enum port port)
>  {
> -	switch (port) {
> -	case PORT_A:
> +	enum phy phy = intel_port_to_phy(dev_priv, port);
> +
> +	switch (phy) {
> +	case PHY_A:
>  		return HPD_PORT_A;
> -	case PORT_B:
> +	case PHY_B:
>  		return HPD_PORT_B;
> -	case PORT_C:
> +	case PHY_C:
>  		return HPD_PORT_C;
> -	case PORT_D:
> +	case PHY_D:
>  		return HPD_PORT_D;
> -	case PORT_E:
> +	case PHY_E:
>  		return HPD_PORT_E;
> -	case PORT_F:
> +	case PHY_F:
>  		if (IS_CNL_WITH_PORT_F(dev_priv))
>  			return HPD_PORT_E;
>  		return HPD_PORT_F;
> -	case PORT_G:
> +	case PHY_G:
>  		return HPD_PORT_G;
> -	case PORT_H:
> +	case PHY_H:
>  		return HPD_PORT_H;
> -	case PORT_I:
> +	case PHY_I:
>  		return HPD_PORT_I;
>  	default:
> -		MISSING_CASE(port);
> +		MISSING_CASE(phy);
>  		return HPD_NONE;
>  	}
>  }

Looks good but while you are at it why not optimize with something
like:

switch(phy) {
PHY_F:
	if (IS_CNL_WITH_PORT_F(dev_priv))
		return HPD_PORT_E;
	return HPD_PORT_F;
PHY_A:
PHY_B:
..:
	return HPD_PORT_A + phy
default:
	...