On Tue, 2018-01-30 at 14:51 +0530, Mahesh Kumar wrote:
> From: "Kumar, Mahesh" <mahesh1.ku...@intel.com>
>
> Platforms before Gen11 were sharing lanes between port-A & port-E.
> This limitation is no more there.
>
> Changes since V1:
> - optimize the code (Shashank/Jani)
> - create helper function to get max lanes (ville)
>
> Signed-off-by: Mahesh Kumar <mahesh1.ku...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_ddi.c | 43
> +++++++++++++++++-----------------------
> 1 file changed, 18 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
> b/drivers/gpu/drm/i915/intel_ddi.c
> index e51559be2e3b..4bde742a8ff4 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2842,6 +2842,23 @@ static bool intel_ddi_a_force_4_lanes(struct
> intel_digital_port *dport)
> return false;
> }
>
> +static int
> +intel_ddi_max_lanes(struct drm_i915_private *dev_priv, enum port port)
> +{
> + if (INTEL_GEN(dev_priv) >= 11)
> + return 4;
> +
> + if (port == PORT_A || port == PORT_E) {
> + if (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES)
Is the expectation that bios has already written the correct value
depending on the board?
The patch itself looks correct
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> + return port == PORT_A ? 4 : 0;
> + else
> + /* Both A and E share 2 lanes */
> + return 2;
> + }
> +
> + return 4;
> +}
> +
> void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
> {
> struct intel_digital_port *intel_dig_port;
> @@ -2850,31 +2867,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv,
> enum port port)
> bool init_hdmi, init_dp, init_lspcon = false;
> int max_lanes;
>
> - if (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES) {
> - switch (port) {
> - case PORT_A:
> - max_lanes = 4;
> - break;
> - case PORT_E:
> - max_lanes = 0;
> - break;
> - default:
> - max_lanes = 4;
> - break;
> - }
> - } else {
> - switch (port) {
> - case PORT_A:
> - max_lanes = 2;
> - break;
> - case PORT_E:
> - max_lanes = 2;
> - break;
> - default:
> - max_lanes = 4;
> - break;
> - }
> - }
> + max_lanes = intel_ddi_max_lanes(dev_priv, port);
>
> init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi ||
> dev_priv->vbt.ddi_port_info[port].supports_hdmi);
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