[PATCH 09/11] drm/dp_mst: Add drm_dp_mst_aux_for_parent()

[Nautiyal, Ankit K]

On 3/27/2024 7:55 PM, Imre Deak wrote:
> On Wed, Mar 27, 2024 at 02:30:53PM +0530, Nautiyal, Ankit K wrote:
>> On 3/21/2024 1:41 AM, Imre Deak wrote:
>>> Add a function to get the AUX device of the parent of an MST port, used
>>> by a follow-up i915 patch in the patchset.
>>>
>>> Cc: Lyude Paul <lyude at redhat.com>
>>> Cc: dri-devel at lists.freedesktop.org
>>> Signed-off-by: Imre Deak <imre.deak at intel.com>
>>> ---
>>>    drivers/gpu/drm/display/drm_dp_mst_topology.c | 16 ++++++++++++++++
>>>    1 file changed, 16 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
>>> index 6bd471a2266ce..d70f7de644371 100644
>>> --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
>>> +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
>>> @@ -6004,6 +6004,22 @@ static bool drm_dp_mst_is_virtual_dpcd(struct drm_dp_mst_port *port)
>>>    	return false;
>>>    }
>>> +/**
>>> + * drm_dp_mst_aux_for_parent() - Get the AUX device for an MST port's parent
>>> + * @port: MST port whose parent's AUX device is returned
>>> + *
>>> + * Return the AUX device for @port's parent or NULL if port's parent is the
>>> + * root port.
>>> + */
>>> +struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port)
>>> +{
>>> +	if (!port->parent || !port->parent->port_parent)
>>> +		return NULL;
>>> +
>>> +	return &port->parent->port_parent->aux;
>>> +}
>>> +EXPORT_SYMBOL(drm_dp_mst_aux_for_parent);
>> As mentioned in previous patch, the declaration of this in the header,
>> got included in previous patch.
> Yes thanks, the header change should've been in this patch, will move it here
> (while applying the patches if nothing else comes up).

With the above fixed, this is:

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

>> Regards,
>>
>> Ankit
>>
>>> +
>>>    /**
>>>     * drm_dp_mst_dsc_aux_for_port() - Find the correct aux for DSC
>>>     * @port: The port to check. A leaf of the MST tree with an attached display.