Re: [PATCH] drm/i915: Use pipe_config's cpu_transcoder for reading dp_mst hw state

[Jani Nikula <jani.nikula@linux.intel.com>]

On Fri, 30 Jan 2015, Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com> wrote:
> On the hardware state readout path, using crtc->config happens to work
> since the proper value is written to it before encoder->get_config() is
> called. However, in the check_crtc() path, the state will be read from
> the cpu_transcoder in the software tracking, instead of the one just
> read out from hw. Using the field in the supplied intel_crtc_state
> should do the right thing in both cases.
>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
> ---
>
> I noticed this while reading the code. Patch is only compiled tested.

There might be a bug for this.

BR,
Jani.

>
> ---
>  drivers/gpu/drm/i915/intel_dp_mst.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 2856b0b..9f67a37 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -226,7 +226,7 @@ static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
>  	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
>  	struct drm_device *dev = encoder->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> -	enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
> +	enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
>  	u32 temp, flags = 0;
>  
>  	pipe_config->has_dp_encoder = true;
> -- 
> 2.1.0
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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