Re: [PATCH 13/20] drm/i915: use current scaler state during readout_hw_state.

[Matt Roper <matthew.d.roper@intel.com>]

On Wed, Apr 01, 2015 at 07:59:42PM -0700, Chandra Konduru wrote:
> During readout_hw_state, rebuild crtc scaler_state from hw state:
>  - crtc scaler id
>  - scaler users

This patch doesn't look like it actually does what you're advertising
here.  If your firmware or bootloader or whatever has programmed the
display in a way that some scalers are in use, I think your state
variables are still going to show all scalers as free after you're done
here, right?

>  - scaling ratios

I think this is the only thing that will actually match the hardware
state, but we've already noted that those state fields can probably just
go away since we can trivially calculate the proper values in the places
we're currently using them.


Matt

> 
> Signed-off-by: Chandra Konduru <chandra.konduru@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 aae4a22..834ea46 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8756,6 +8756,11 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>  
>  	intel_get_pipe_timings(crtc, pipe_config);
>  
> +	if (INTEL_INFO(dev)->gen >= 9) {
> +		skl_init_scalers(dev, crtc->pipe, pipe_config);
> +		skl_update_scaling_ratio(dev, pipe_config);
> +	}
> +
>  	pfit_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
>  	if (intel_display_power_is_enabled(dev_priv, pfit_domain)) {
>  		if (IS_SKYLAKE(dev))
> -- 
> 1.7.9.5
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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