[Intel-gfx] [PATCH 2/4] drm/i915: Add comments about fixed pipe->transcoder/PLL mapping

[Ville Syrjälä]

On Thu, May 12, 2016 at 04:18:50PM +0300, Imre Deak wrote:
> Code checkers may complain about the explicit casts between different
> enum types, so add comments for known-valid cases to help future
> triaging of such complaints.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index b60d9b6..763726d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -9294,6 +9294,7 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
>  		ironlake_get_fdi_m_n_config(crtc, pipe_config);
>  
>  		if (HAS_PCH_IBX(dev_priv)) {
> +			/* the pipe->pll mapping is fixed */

Should perhaps say 'pch transocder->pll mapping' here.

>  			pll_id = (enum intel_dpll_id) crtc->pipe;
>  		} else {
>  			tmp = I915_READ(PCH_DPLL_SEL);
> @@ -9844,6 +9845,10 @@ static bool hsw_get_transcoder_state(struct intel_crtc *crtc,
>  	enum intel_display_power_domain power_domain;
>  	u32 tmp;
>  
> +	/*
> +	 * The transcoder->pipe mapping is fixed with the exception of the eDP

Saying 'pipe->transcoder mapping' would feel more natural to me
since that's the way the data flows. Also that's the way assignment in
the code happens.

But I can live with the current thing too, so
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> +	 * transcoder handled below.
> +	 */
>  	pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
>  
>  	/*
> -- 
> 2.5.0
> 
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-- 
Ville Syrjälä
Intel OTC