linux-kernel - Re: [PATCH 08/26] drm/dp_mst: Refactor drm_dp_send_enum_path

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Message-ID: <20190814150523.GH7444@phenom.ffwll.local>
Date:   Wed, 14 Aug 2019 17:05:23 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Lyude Paul <lyude@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, Juston Li <juston.li@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Harry Wentland <hwentlan@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/26] drm/dp_mst: Refactor
 drm_dp_send_enum_path_resources

On Wed, Jul 17, 2019 at 09:42:31PM -0400, Lyude Paul wrote:
> Use more pointers so we don't have to write out
> txmsg->reply.u.path_resources each time. Also, fix line wrapping +
> rearrange local variables.
> 
> Cc: Juston Li <juston.li@...el.com>
> Cc: Imre Deak <imre.deak@...el.com>
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Cc: Harry Wentland <hwentlan@....com>
> Signed-off-by: Lyude Paul <lyude@...hat.com>

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 24 ++++++++++++++++--------
>  1 file changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index ec6865e1af75..57c9c605ee17 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2350,12 +2350,14 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
>  	kfree(txmsg);
>  }
>  
> -static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
> -					   struct drm_dp_mst_branch *mstb,
> -					   struct drm_dp_mst_port *port)
> +static int
> +drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
> +				struct drm_dp_mst_branch *mstb,
> +				struct drm_dp_mst_port *port)
>  {
> -	int len;
> +	struct drm_dp_enum_path_resources_ack_reply *path_res;
>  	struct drm_dp_sideband_msg_tx *txmsg;
> +	int len;
>  	int ret;
>  
>  	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
> @@ -2369,14 +2371,20 @@ static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
>  
>  	ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
>  	if (ret > 0) {
> +		path_res = &txmsg->reply.u.path_resources;
> +
>  		if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
>  			DRM_DEBUG_KMS("enum path resources nak received\n");
>  		} else {
> -			if (port->port_num != txmsg->reply.u.path_resources.port_number)
> +			if (port->port_num != path_res->port_number)
>  				DRM_ERROR("got incorrect port in response\n");
> -			DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number,
> -			       txmsg->reply.u.path_resources.avail_payload_bw_number);
> -			port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
> +
> +			DRM_DEBUG_KMS("enum path resources %d: %d %d\n",
> +				      path_res->port_number,
> +				      path_res->full_payload_bw_number,
> +				      path_res->avail_payload_bw_number);
> +			port->available_pbn =
> +				path_res->avail_payload_bw_number;
>  		}
>  	}
>  
> -- 
> 2.21.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch