linux-kernel - Re: [PATCH v4 1/7] usb: typec: Add default HPD device when register DisplayPort altmode

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Message-ID: <202509221516.1umvcXG6-lkp@intel.com>
Date: Mon, 22 Sep 2025 15:56:35 +0800
From: kernel test robot <lkp@...el.com>
To: Chaoyi Chen <kernel@...kyi.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>, Sandy Huang <hjc@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Yubing Zhang <yubing.zhang@...k-chips.com>,
	Frank Wang <frank.wang@...k-chips.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Amit Sunil Dhamne <amitsd@...gle.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Chaoyi Chen <chaoyi.chen@...k-chips.com>,
	Dragan Simic <dsimic@...jaro.org>, Johan Jonker <jbx6244@...il.com>,
	Diederik de Haas <didi.debian@...ow.org>,
	Dmitry Baryshkov <lumag@...nel.org>,
	Peter Robinson <pbrobinson@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 1/7] usb: typec: Add default HPD device when register
 DisplayPort altmode

Hi Chaoyi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on usb/usb-next usb/usb-linus robh/for-next linus/master v6.17-rc7 next-20250919]
[cannot apply to rockchip/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chaoyi-Chen/usb-typec-Add-default-HPD-device-when-register-DisplayPort-altmode/20250922-092549
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20250922012039.323-2-kernel%40airkyi.com
patch subject: [PATCH v4 1/7] usb: typec: Add default HPD device when register DisplayPort altmode
config: i386-buildonly-randconfig-003-20250922 (https://download.01.org/0day-ci/archive/20250922/202509221516.1umvcXG6-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250922/202509221516.1umvcXG6-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509221516.1umvcXG6-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/usb/typec/class.c:18:
>> drivers/usb/typec/altmodes/displayport.h:7:5: warning: no previous prototype for 'dp_altmode_probe' [-Wmissing-prototypes]
       7 | int dp_altmode_probe(struct typec_altmode *alt) { return -ENOTSUPP; }
         |     ^~~~~~~~~~~~~~~~
>> drivers/usb/typec/altmodes/displayport.h:8:6: warning: no previous prototype for 'dp_altmode_remove' [-Wmissing-prototypes]
       8 | void dp_altmode_remove(struct typec_altmode *alt) { }
         |      ^~~~~~~~~~~~~~~~~
>> drivers/usb/typec/altmodes/displayport.h:9:6: warning: no previous prototype for 'dp_altmode_hpd_device_register' [-Wmissing-prototypes]
       9 | void dp_altmode_hpd_device_register(struct typec_altmode *alt) { }
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/dp_altmode_probe +7 drivers/usb/typec/altmodes/displayport.h

d266e96820cc36 Ajay Gupta  2019-04-23 @7  int dp_altmode_probe(struct typec_altmode *alt) { return -ENOTSUPP; }
d266e96820cc36 Ajay Gupta  2019-04-23 @8  void dp_altmode_remove(struct typec_altmode *alt) { }
50d2edccce6bf3 Chaoyi Chen 2025-09-22 @9  void dp_altmode_hpd_device_register(struct typec_altmode *alt) { }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki