[Intel-gfx] [PATCH] drm/i915: Update comment in clear_intel_crtc_state()

[Daniel Vetter]

On Wed, May 20, 2015 at 09:03:27AM +0300, Ander Conselvan de Oliveira wrote:
> Explain why a few fields of the new pipe_config have their values
> preserved, while the others are zeroed.
> 
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>

Queued for -next, thanks for the patch.
-Daniel

> ---
>  drivers/gpu/drm/i915/intel_display.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a7732b4..b0cd649 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11460,7 +11460,11 @@ clear_intel_crtc_state(struct intel_crtc_state *crtc_state)
>  	enum intel_dpll_id shared_dpll;
>  	uint32_t ddi_pll_sel;
>  
> -	/* Clear only the intel specific part of the crtc state excluding scalers */
> +	/* FIXME: before the switch to atomic started, a new pipe_config was
> +	 * kzalloc'd. Code that depends on any field being zero should be
> +	 * fixed, so that the crtc_state can be safely duplicated. For now,
> +	 * only fields that are know to not cause problems are preserved. */
> +
>  	tmp_state = crtc_state->base;
>  	scaler_state = crtc_state->scaler_state;
>  	shared_dpll = crtc_state->shared_dpll;
> -- 
> 2.1.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch