[Intel-gfx] [PATCH 3/3] drm/i915/icl: Fix TypeC legacy DP HPD handling

[Rodrigo Vivi]

On Thu, Dec 13, 2018 at 09:48:50PM +0200, Imre Deak wrote:
> TypeC legacy DP ports can't be implied the same way we implied TypeC
> legacy HDMI ports in the previous patch. So that we still have
> functioning DP legacy ports, mark them as legacy at the first connect
> event. After that we treat the port the same way as in the HDMI case,
> that is keep it in legacy mode whenever we are not suspended.
> 
> Eventually - instead of the methods in this and the previous patch -
> we'll depend on an explicit way to detect both HDMI and DP TypeC legacy
> ports either via a VBT option or a HW/FW register.
> 
> Suggested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 19e49adab548..f5de0d079ab5 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5220,8 +5220,14 @@ static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
>  	bool is_legacy, is_typec, is_tbt;
>  	u32 dpsp;
>  
> -	is_legacy = intel_dig_port->tc_legacy_port ||
> +	/*
> +	 * TODO: Depend only on the tc_legacy_port flag to identify legacy
> +	 * ports, once we have an explicit detection method for legacy mode
> +	 * (via VBT or a HW/FW register).
> +	 */
> +	intel_dig_port->tc_legacy_port |=
>  		I915_READ(SDEISR) & SDE_TC_HOTPLUG_ICP(tc_port);
> +	is_legacy = intel_dig_port->tc_legacy_port;
>  
>  	/*
>  	 * The spec says we shouldn't be using the ISR bits for detecting
> -- 
> 2.13.2
> 
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