linux-kernel - Re: [PATCH v3 2/2] display/drm/bridge: TC358775 DSI/LVDS driver

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Date:   Sat, 20 Jun 2020 03:18:40 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vinay Simha BN <simhavcs@...il.com>
Cc:     kbuild-all@...ts.01.org, Vinay Simha BN <simhavcs@...il.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v3 2/2] display/drm/bridge: TC358775 DSI/LVDS driver

Hi Vinay,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.8-rc1 next-20200618]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Vinay-Simha-BN/dt-binding-Add-DSI-LVDS-TC358775-bridge-bindings/20200618-202234
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1b5044021070efa3259f3e9548dc35d1eb6aa844
config: nds32-randconfig-r002-20200619 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/gpu/drm/bridge/tc358775.c:505:5: warning: no previous prototype for 'tc358775_parse_dt' [-Wmissing-prototypes]
505 | int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
|     ^~~~~~~~~~~~~~~~~

vim +/tc358775_parse_dt +505 drivers/gpu/drm/bridge/tc358775.c

   504	
 > 505	int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
   506	{
   507		struct device_node *endpoint;
   508		struct device_node *parent;
   509		struct device_node *remote;
   510		struct property *prop;
   511		int len;
   512	
   513		endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node,
   514							 TC358775_DSI_IN, -1);
   515		if (endpoint) {
   516			/* dsi0_out node */
   517			parent = of_graph_get_remote_port_parent(endpoint);
   518			of_node_put(endpoint);
   519			if (parent) {
   520				/* dsi0 port 1 */
   521				endpoint = of_graph_get_endpoint_by_regs(parent, 1, -1);
   522				of_node_put(parent);
   523				if (endpoint) {
   524					prop = of_find_property(endpoint, "data-lanes",
   525								&len);
   526					of_node_put(endpoint);
   527					if (!prop) {
   528						dev_err(tc->dev,
   529							"failed to find data lane\n");
   530						return -EPROBE_DEFER;
   531					}
   532				}
   533			}
   534		}
   535	
   536		tc->num_dsi_lanes = len / sizeof(u32);
   537	
   538		if (tc->num_dsi_lanes < 1 || tc->num_dsi_lanes > 4)
   539			return -EINVAL;
   540	
   541		tc->host_node = of_graph_get_remote_node(np, 0, 0);
   542		if (!tc->host_node)
   543			return -ENODEV;
   544	
   545		of_node_put(tc->host_node);
   546	
   547		endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node,
   548							 TC358775_LVDS_OUT1, -1);
   549		if (endpoint) {
   550			remote = of_graph_get_remote_port_parent(endpoint);
   551			of_node_put(endpoint);
   552	
   553			if (remote) {
   554				if (of_device_is_available(remote))
   555					tc->dual_link = true;
   556				of_node_put(remote);
   557			}
   558		}
   559	
   560		dev_dbg(tc->dev, "no.of dsi lanes: %d\n", tc->num_dsi_lanes);
   561		dev_dbg(tc->dev, "operating in %s-link mode\n",
   562			tc->dual_link ? "dual" : "single");
   563	
   564		return 0;
   565	}
   566	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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