[PATCH v2 1/8] drm/dp: Factor out helper to distinguish between branch and sink devices

[Jani Nikula]

On Mon, 24 Oct 2016, Imre Deak <imre.deak at intel.com> wrote:
> This check is open-coded in a few places, so it makes sense to simplify
> things by having a helper for it similar to the rest of DPCD feature
> helpers.
>
> v2: (Jani)
> - Move the helper to drm_dp_helper.h.
> - Split out this change to a separate patch.
>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Imre Deak <imre.deak at intel.com>

DP 1.4 has changed the name of "branch" devices, but I think this is
good.

Reviewed-by: Jani Nikula <jani.nikula at intel.com>


> ---
>  drivers/gpu/drm/i915/intel_dp.c | 11 ++++-------
>  include/drm/drm_dp_helper.h     |  6 ++++++
>  2 files changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index f30db8f..3c2293b 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1459,8 +1459,7 @@ static void intel_dp_print_hw_revision(struct intel_dp *intel_dp)
>  	if ((drm_debug & DRM_UT_KMS) == 0)
>  		return;
>  
> -	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> -	      DP_DWN_STRM_PORT_PRESENT))
> +	if (!drm_dp_is_branch(intel_dp->dpcd))
>  		return;
>  
>  	len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_HW_REV, &rev, 1);
> @@ -1478,8 +1477,7 @@ static void intel_dp_print_sw_revision(struct intel_dp *intel_dp)
>  	if ((drm_debug & DRM_UT_KMS) == 0)
>  		return;
>  
> -	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> -	      DP_DWN_STRM_PORT_PRESENT))
> +	if (!drm_dp_is_branch(intel_dp->dpcd))
>  		return;
>  
>  	len = drm_dp_dpcd_read(&intel_dp->aux, DP_BRANCH_SW_REV, &rev, 2);
> @@ -3615,8 +3613,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
>  	if (!is_edp(intel_dp) && !intel_dp->sink_count)
>  		return false;
>  
> -	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> -	      DP_DWN_STRM_PORT_PRESENT))
> +	if (!drm_dp_is_branch(intel_dp->dpcd))
>  		return true; /* native DP sink */
>  
>  	if (intel_dp->dpcd[DP_DPCD_REV] == 0x10)
> @@ -4134,7 +4131,7 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
>  		return connector_status_connected;
>  
>  	/* if there's no downstream port, we're done */
> -	if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
> +	if (!drm_dp_is_branch(dpcd))
>  		return connector_status_connected;
>  
>  	/* If we're HPD-aware, SINK_COUNT changes dynamically */
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 2a79882..55bbeb0 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -690,6 +690,12 @@ drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
>  		dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED;
>  }
>  
> +static inline bool
> +drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> +{
> +	return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
> +}
> +
>  /*
>   * DisplayPort AUX channel
>   */

-- 
Jani Nikula, Intel Open Source Technology Center