[Intel-gfx] [v3 2/7] drm/dp/fec: DRM helper for Forward Error Correction

[Manasi Navare]

On Thu, Oct 25, 2018 at 09:49:38PM -0700, Anusha Srivatsa wrote:
> DP 1.4 has Forward Error Correction Support(FEC).
> Add helper function to check if the sink device
> supports FEC.
> 
> v2: Separate the helper and the code that uses the helper into
> two separate patches. (Manasi)
> 
> v3:
> - Move the code to drm_dp_helper.c (Manasi)
> - change the return type, code style changes (Gaurav)
> - Use drm_dp_dpcd_readb instead of drm_dp_dpcd_read. (Jani)
> 
> v4:
> - Avoid aux reads everytime, instead read cached
> values of dpcd register (jani)
> - Move helper to drm_dp_helper.h like other dsc
> helpers.(Anusha)
> 
> v5: rebased. Change the helper parameter suitably.
> 
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>

Reviewed-by: Manasi Navare <manasi.d.navare at intel.com>

Manasi

> ---
>  include/drm/drm_dp_helper.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 2649529d0d8f..b08f50b852f5 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1101,6 +1101,13 @@ drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>  		DP_DSC_SLICE_WIDTH_MULTIPLIER;
>  }
>  
> +/* Forward Error Correction Support on DP 1.4 */
> +static inline bool
> +drm_dp_sink_supports_fec(const u8 fec_capable)
> +{
> +	return fec_capable & DP_FEC_CAPABLE;
> +}
> +
>  /*
>   * DisplayPort AUX channel
>   */
> -- 
> 2.17.1
>