On Mon, Aug 03, 2015 at 03:45:32PM +0530, Gaurav K Singh wrote:
> Just like single link MIPI panels, similarly for dual link panels, pipe to be
> configured is based on the DVO port from VBT Block 2. In hardware,
> Port A is mapped with Pipe A and Port C is mapped with Pipe B.
>
> This issue got introduced in -
>
> commit 7e9804fdcffc650515c60f524b8b2076ee59e710
> Author: Jani Nikula <jani.nikula@xxxxxxxxx>
> Date: Fri Jan 16 14:27:23 2015 +0200
>
> drm/i915/dsi: add drm mipi dsi host support
>
> Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dsi.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 18dd7d7..8aa9c7cc 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -1048,11 +1048,7 @@ void intel_dsi_init(struct drm_device *dev)
> intel_connector->unregister = intel_connector_unregister;
>
> /* Pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI port C */
> - if (dev_priv->vbt.dsi.config->dual_link) {
> - /* XXX: does dual link work on either pipe? */
> - intel_encoder->crtc_mask = (1 << PIPE_A);
> - intel_dsi->ports = ((1 << PORT_A) | (1 << PORT_C));
> - } else if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA) {
> + if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA) {
> intel_encoder->crtc_mask = (1 << PIPE_A);
> intel_dsi->ports = (1 << PORT_A);
> } else if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIC) {
> @@ -1060,6 +1056,9 @@ void intel_dsi_init(struct drm_device *dev)
> intel_dsi->ports = (1 << PORT_C);
> }
>
> + if (dev_priv->vbt.dsi.config->dual_link)
> + intel_dsi->ports = ((1 << PORT_A) | (1 << PORT_C));
> +
This looks sane based on the fact that intel_dsi_port_enable() sets
up the MIPI_PORT_CTRL lane configuration bits in a different way
depending on which pipe is driving the dual link. And the spec agrees
on the meaning of those bits.
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> /* Create a DSI host (and a device) for each port. */
> for_each_dsi_port(port, intel_dsi->ports) {
> struct intel_dsi_host *host;
> --
> 1.7.9.5
>
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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