[Intel-gfx] [PATCH v6 3/5] drm/i915: Parse VBT data for lspcon

[Jani Nikula]

On Fri, 14 Oct 2016, Shashank Sharma <shashank.sharma at intel.com> 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.
>
> V4: Rebase
> V5: Rebase
> V6: Pass dev_priv to HAS_LSPCON() macro
>
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

I was hoping you'd use the version I rebased and sent, put it first in
the series, and rebase the rest on that. The point is, this series has
taken so long that lspcon devices have proliferated all over the place,
and we'll be getting more and more bugs about them. If this patch was
first, with the debug logging, we could at least get that to 4.9, maybe
stable kernels, and we'd immediately know the reason. I think it'll be a
hard sell to get the whole series to 4.9 kernel.

BR,
Jani.


> ---
>  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 fe875b2..7bab2f1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2864,6 +2864,8 @@ struct drm_i915_cmd_table {
>  
>  #define HAS_GMCH_DISPLAY(dev_priv) ((dev_priv)->info.has_gmch_display)
>  
> +#define HAS_LSPCON(dev_priv) (IS_GEN9(dev_priv))
> +
>  /* DPF == dynamic parity feature */
>  #define HAS_L3_DPF(dev_priv) ((dev_priv)->info.has_l3_dpf)
>  #define NUM_L3_SLICES(dev_priv) (IS_HSW_GT3(dev_priv) ? \
> @@ -3631,6 +3633,9 @@ 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 83667e8..32e1def 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -1763,3 +1763,52 @@ 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;
> +}

-- 
Jani Nikula, Intel Open Source Technology Center