Re: [Intel-gfx] [PATCH v2 5/7] drm/i915: Beef up SDVO/HDMI port checks

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

On Wed, 31 May 2023, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> The SDVO code already warns when the port in question doesn't
> actually support SDVO. Let's make that also bail the encoder
> registration like the generic assert_port_valid() we added.
>
> And add a similar thing for g4x HDMI, mainly because on g4x
> itsefl port D only supports DP but not SDVO/HDMI. For the
> other platforms the generic port_mask check should actually
> be sufficient, but since we're here might as well list the
> ports.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  drivers/gpu/drm/i915/display/g4x_hdmi.c   | 17 +++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_sdvo.c | 17 ++++++++++++-----
>  2 files changed, 29 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c
> index 59704939c111..8c71e3ede680 100644
> --- a/drivers/gpu/drm/i915/display/g4x_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c
> @@ -659,6 +659,20 @@ int g4x_hdmi_connector_atomic_check(struct drm_connector *connector,
>  	return ret;
>  }
>  
> +static bool is_hdmi_port_valid(struct drm_i915_private *i915, enum port port)
> +{
> +	if (IS_G4X(i915) || IS_VALLEYVIEW(i915))
> +		return port == PORT_B || port == PORT_C;
> +	else
> +		return port == PORT_B || port == PORT_C || port == PORT_D;
> +}
> +
> +static bool assert_hdmi_port_valid(struct drm_i915_private *i915, enum port port)
> +{
> +	return !drm_WARN(&i915->drm, !is_hdmi_port_valid(i915, port),
> +			 "Platform does not support HDMI %c\n", port_name(port));
> +}
> +
>  void g4x_hdmi_init(struct drm_i915_private *dev_priv,
>  		   i915_reg_t hdmi_reg, enum port port)
>  {
> @@ -670,6 +684,9 @@ void g4x_hdmi_init(struct drm_i915_private *dev_priv,
>  	if (!assert_port_valid(dev_priv, port))
>  		return;
>  
> +	if (!assert_hdmi_port_valid(dev_priv, port))
> +		return;
> +
>  	devdata = intel_bios_encoder_data_lookup(dev_priv, port);
>  
>  	/* FIXME bail? */
> diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
> index 6ed613558cf8..e6b140b073c3 100644
> --- a/drivers/gpu/drm/i915/display/intel_sdvo.c
> +++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
> @@ -3314,13 +3314,19 @@ intel_sdvo_init_ddc_proxy(struct intel_sdvo *sdvo,
>  	return i2c_add_adapter(&sdvo->ddc) == 0;
>  }
>  
> -static void assert_sdvo_port_valid(const struct drm_i915_private *dev_priv,
> -				   enum port port)
> +static bool is_sdvo_port_valid(struct drm_i915_private *dev_priv, enum port port)
>  {
>  	if (HAS_PCH_SPLIT(dev_priv))
> -		drm_WARN_ON(&dev_priv->drm, port != PORT_B);
> +		return port == PORT_B;
>  	else
> -		drm_WARN_ON(&dev_priv->drm, port != PORT_B && port != PORT_C);
> +		return port == PORT_B || port == PORT_C;
> +}
> +
> +static bool assert_sdvo_port_valid(struct drm_i915_private *dev_priv,
> +				   enum port port)
> +{
> +	return !drm_WARN(&dev_priv->drm, !is_sdvo_port_valid(dev_priv, port),
> +			 "Platform does not support SDVO %c\n", port_name(port));
>  }
>  
>  bool intel_sdvo_init(struct drm_i915_private *dev_priv,
> @@ -3333,7 +3339,8 @@ bool intel_sdvo_init(struct drm_i915_private *dev_priv,
>  	if (!assert_port_valid(dev_priv, port))
>  		return false;
>  
> -	assert_sdvo_port_valid(dev_priv, port);
> +	if (!assert_sdvo_port_valid(dev_priv, port))
> +		return false;
>  
>  	intel_sdvo = kzalloc(sizeof(*intel_sdvo), GFP_KERNEL);
>  	if (!intel_sdvo)

-- 
Jani Nikula, Intel Open Source Graphics Center