[Intel-gfx] [PATCH] drm/i915: Sink rate read should be saved in deca-kHz

[Jani Nikula]

On Thu, 07 May 2015, Sonika Jindal <sonika.jindal at intel.com> wrote:
> The sink rate read from supported link rate table is in KHz as per spec
> while in drm, the saved clock is in deca-KHz. So divide the link rate by
> 10 before storing.
>
> Reading of rates was added by:
> commit fc0f8e25318f ("drm/i915/skl: Read sink supported rates from edp
> panel")

Thanks; now this git spell

$ git tag --contains fc0f8e25318f | grep ^v[0-9] | sort -V | head -n 1
v4.1-rc1

will tell me I need to queue this one to v4.1 through drm-intel-fixes
while the rest is for Daniel to merge to drm-intel-next-queued.

Pushed, thanks for the patch and review.

BR,
Jani.


>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index bacdec5..6bd5afb 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3906,7 +3906,8 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
>  			if (val == 0)
>  				break;
>  
> -			intel_dp->sink_rates[i] = val * 200;
> +			/* Value read is in kHz while drm clock is saved in deca-kHz */
> +			intel_dp->sink_rates[i] = (val * 200) / 10;
>  		}
>  		intel_dp->num_sink_rates = i;
>  	}
> -- 
> 1.7.10.4
>
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-- 
Jani Nikula, Intel Open Source Technology Center