Re: [PATCH v3 3/4] drm/i915: Parse VBT data for lspcon

["Vivi, Rodrigo" <rodrigo.vivi@intel.com>]

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

On Tue, 2016-07-05 at 18:35 +0530, Shashank Sharma wrote:
> Many GEN9 boards come with on-board lspcon cards.
> Fot these boards, VBT configuration should properly point out
> if a particular port contains lspcon device, so that driver can
> initialize it properly.
> 
> This patch adds a utility function, which checks the VBT flag
> for lspcon bit, and tells us if a port is configured to have a
> lspcon device or not.
> 
> V2: Fixed review comments from Ville
> - Do not forget PORT_D while checking lspcon for GEN9
> 
> V3: Addressed review comments from Rodrigo
> - Create a HAS_LSPCON() macro for better use case handling.
> - Do not dump warnings for non-gen-9 platforms, it will be noise.
> 
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h   |  5 ++++
>  drivers/gpu/drm/i915/intel_bios.c | 49
> +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 54 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> index 594ddbb..91e1dd1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2896,6 +2896,8 @@ struct drm_i915_cmd_table {
>  #define HAS_GMCH_DISPLAY(dev) (INTEL_INFO(dev)->gen < 5 || \
>  			       IS_VALLEYVIEW(dev) ||
> IS_CHERRYVIEW(dev))
>  
> +#define HAS_LSPCON(dev) (IS_GEN9(dev))
> +
>  /* DPF == dynamic parity feature */
>  #define HAS_L3_DPF(dev) (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
>  #define NUM_L3_SLICES(dev) (IS_HSW_GT3(dev) ? 2 : HAS_L3_DPF(dev))
> @@ -3706,6 +3708,9 @@ bool intel_bios_is_port_dp_dual_mode(struct
> drm_i915_private *dev_priv, enum por
>  bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
> enum port *port);
>  bool intel_bios_is_port_hpd_inverted(struct drm_i915_private
> *dev_priv,
>  				     enum port port);
> +bool intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
> +				enum port port);
> +
>  
>  /* intel_opregion.c */
>  #ifdef CONFIG_ACPI
> diff --git a/drivers/gpu/drm/i915/intel_bios.c
> b/drivers/gpu/drm/i915/intel_bios.c
> index da5ed4a..121df10 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -1759,3 +1759,52 @@ intel_bios_is_port_hpd_inverted(struct
> drm_i915_private *dev_priv,
>  
>  	return false;
>  }
> +
> +/**
> + * intel_bios_is_lspcon_present - if LSPCON is attached on %port
> + * @dev_priv:	i915 device instance
> + * @port:	port to check
> + *
> + * Return true if LSPCON is present on this port
> + */
> +bool
> +intel_bios_is_lspcon_present(struct drm_i915_private *dev_priv,
> +				enum port port)
> +{
> +	int i;
> +
> +	if (!HAS_LSPCON(dev_priv))
> +		return false;
> +
> +	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
> +		if (!dev_priv->vbt.child_dev[i].common.lspcon)
> +			continue;
> +
> +		switch (dev_priv->vbt.child_dev[i].common.dvo_port)
> {
> +		case DVO_PORT_DPA:
> +		case DVO_PORT_HDMIA:
> +			if (port == PORT_A)
> +				return true;
> +			break;
> +		case DVO_PORT_DPB:
> +		case DVO_PORT_HDMIB:
> +			if (port == PORT_B)
> +				return true;
> +			break;
> +		case DVO_PORT_DPC:
> +		case DVO_PORT_HDMIC:
> +			if (port == PORT_C)
> +				return true;
> +			break;
> +		case DVO_PORT_DPD:
> +		case DVO_PORT_HDMID:
> +			if (port == PORT_D)
> +				return true;
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +
> +	return false;
> +}
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