[Intel-gfx] [PATCH 2/2] drm/i915: Remove duplicate DDI enabling logic from MST path

[Imre Deak]

On Tue, Feb 28, 2017 at 09:21:13AM +0200, Ander Conselvan de Oliveira wrote:
> The logic to enable a DDI in intel_mst_pre_enable_dp() is essentially
> the same as in intel_ddi_pre_enable_dp(). So reuse the latter function
> by calling the post_disable hook on the intel_dig_port instead of
                 ^pre_enable
> duplicating that code.
> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c    |  2 ++
>  drivers/gpu/drm/i915/intel_dp_mst.c | 23 +++--------------------
>  2 files changed, 5 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index e9013f1..71aaddf 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1695,6 +1695,8 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
>  	enum port port = intel_ddi_get_encoder_port(encoder);
>  	struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
>  
> +	WARN_ON(link_mst && port == PORT_A);
> +

So IIUC, this wasn't used before for MST and so link_mst was always
false. Also link_mst=true implies type == INTEL_OUTPUT_DP, as this will
be called for the primary encoder. After the change crtc->config will be
used instead of the (new) pipe_config, but this is fine since the two
are the same in the enable hooks. Looks ok to me:

Reviewed-by: Imre Deak <imre.deak at intel.com>

>  	intel_dp_set_link_params(intel_dp, link_rate, lane_count,
>  				 link_mst);
>  	if (encoder->type == INTEL_OUTPUT_EDP)
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index a8334e1..094cbdc 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -159,26 +159,9 @@ static void intel_mst_pre_enable_dp(struct intel_encoder *encoder,
>  
>  	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
>  
> -	if (intel_dp->active_mst_links == 0) {
> -		intel_ddi_clk_select(&intel_dig_port->base,
> -				     pipe_config->shared_dpll);
> -
> -		intel_display_power_get(dev_priv,
> -					intel_dig_port->ddi_io_power_domain);
> -
> -		intel_prepare_dp_ddi_buffers(&intel_dig_port->base);
> -		intel_dp_set_link_params(intel_dp,
> -					 pipe_config->port_clock,
> -					 pipe_config->lane_count,
> -					 true);
> -
> -		intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
> -
> -		intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
> -
> -		intel_dp_start_link_train(intel_dp);
> -		intel_dp_stop_link_train(intel_dp);
> -	}
> +	if (intel_dp->active_mst_links == 0)
> +		intel_dig_port->base.pre_enable(&intel_dig_port->base,
> +						pipe_config, NULL);
>  
>  	ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
>  				       connector->port,
> -- 
> 2.9.3
> 
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