[Intel-gfx] [PATCH] drm/i915: Ignore pipe B active state when enabling pipe C

[Jani Nikula]

On Mon, 09 Mar 2015, Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com> wrote:
> When enabling pipe C, the check for the number of lanes pipe B uses was
> ignored in case pipe B wasn't active. This would allow pipe C to be
> configured while pipe B is in DPMS off state even if it used more than 2
> lanes. Making pipe B active again while pipe C was also active would
> then fail.

Seems like a good catch. Broken when, or since forever? Cc: stable?
Bugzillas?

BR,
Jani.

>
> Tested-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 597c10b..4008bf4 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3150,8 +3150,7 @@ static void intel_fdi_normal_train(struct drm_crtc *crtc)
>  
>  static bool pipe_has_enabled_pch(struct intel_crtc *crtc)
>  {
> -	return crtc->base.state->enable && crtc->active &&
> -		crtc->config->has_pch_encoder;
> +	return crtc->base.state->enable && crtc->config->has_pch_encoder;
>  }
>  
>  static void ivb_modeset_global_resources(struct drm_device *dev)
> -- 
> 2.1.0
>
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-- 
Jani Nikula, Intel Open Source Technology Center