Re: [PATCH v2] drm/i915/ddi: Rely on VBT DDI port info for eDP detection

[Jani Nikula <jani.nikula@intel.com>]

On Wed, 21 Dec 2016, Imre Deak <imre.deak@intel.com> wrote:
> There is at least one APL based system using port A in DP mode
> (connecting to an on-board DP->VGA adaptor). Atm we'll configure port A
> unconditionally as eDP which is incorrect in this case. Fix this by
> relying on the VBT DDI port 'internal port' flag instead on all ports on
> DDI platforms. For now chicken out from using VBT for port A before
> GEN9.
>
> v2:
> - Move the DDI port info lookup to intel_bios_is_port_edp() (David, Jani)
> - Use the DDI port info on all DDI platforms starting for port B.
>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: David Weinehall <david.weinehall@linux.intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> (v1)
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h   | 1 +
>  drivers/gpu/drm/i915/intel_bios.c | 4 ++++
>  drivers/gpu/drm/i915/intel_dp.c   | 2 +-
>  3 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 77d7a07..1a91409 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1669,6 +1669,7 @@ struct ddi_vbt_port_info {
>  	uint8_t supports_dvi:1;
>  	uint8_t supports_hdmi:1;
>  	uint8_t supports_dp:1;
> +	uint8_t supports_edp:1;
>  
>  	uint8_t alternate_aux_channel;
>  	uint8_t alternate_ddc_pin;
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 1cf2fa6..a359def 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -1161,6 +1161,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
>  	info->supports_dvi = is_dvi;
>  	info->supports_hdmi = is_hdmi;
>  	info->supports_dp = is_dp;
> +	info->supports_edp = is_edp;
>  
>  	DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
>  		      port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
> @@ -1664,6 +1665,9 @@ bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
>  	};
>  	int i;
>  
> +	if (HAS_DDI(dev_priv))
> +		return dev_priv->vbt.ddi_port_info[port].supports_edp;
> +
>  	if (!dev_priv->vbt.child_dev_num)
>  		return false;
>  
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 66b5bc8..746c237 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4975,7 +4975,7 @@ bool intel_dp_is_edp(struct drm_i915_private *dev_priv, enum port port)
>  	if (INTEL_GEN(dev_priv) < 5)
>  		return false;
>  
> -	if (port == PORT_A)
> +	if (INTEL_GEN(dev_priv) < 9 && port == PORT_A)
>  		return true;

I like the split between intel_bios.c and intel_dp.c like this.

If we wanted to be extra careful with this, we might even consider
splitting the patch in two, one changing intel_dp_is_edp and the other
intel_bios_is_port_edp... They *are* distinct changes, after all.

BR,
Jani.


>  
>  	return intel_bios_is_port_edp(dev_priv, port);

-- 
Jani Nikula, Intel Open Source Technology Center
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