linux-kernel - Re: [PATCH] drm/bridge: ite-it6263: Support HDMI vendor specific infoframe

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Message-ID: <202509060412.LmXs40Rg-lkp@intel.com>
Date: Sat, 6 Sep 2025 05:08:40 +0800
From: kernel test robot <lkp@...el.com>
To: Liu Ying <victor.liu@....com>, Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.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>,
	Dmitry Baryshkov <lumag@...nel.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Liu Ying <victor.liu@....com>
Subject: Re: [PATCH] drm/bridge: ite-it6263: Support HDMI vendor specific
 infoframe

Hi Liu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 4ac65880ebca1b68495bd8704263b26c050ac010]

url:    https://github.com/intel-lab-lkp/linux/commits/Liu-Ying/drm-bridge-ite-it6263-Support-HDMI-vendor-specific-infoframe/20250904-171143
base:   4ac65880ebca1b68495bd8704263b26c050ac010
patch link:    https://lore.kernel.org/r/20250904-it6263-vendor-specific-infoframe-v1-1-6efe6545b634%40nxp.com
patch subject: [PATCH] drm/bridge: ite-it6263: Support HDMI vendor specific infoframe
config: i386-buildonly-randconfig-001-20250906 (https://download.01.org/0day-ci/archive/20250906/202509060412.LmXs40Rg-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250906/202509060412.LmXs40Rg-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/202509060412.LmXs40Rg-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/ite-it6263.c:810:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     810 |                 const char zero_bulk[HDMI_PKT_HB_PB_CHUNK_SIZE] = { };
         |                 ^
   1 warning generated.


vim +810 drivers/gpu/drm/bridge/ite-it6263.c

   782	
   783	static int it6263_hdmi_write_infoframe(struct drm_bridge *bridge,
   784					       enum hdmi_infoframe_type type,
   785					       const u8 *buffer, size_t len)
   786	{
   787		struct it6263 *it = bridge_to_it6263(bridge);
   788		struct regmap *regmap = it->hdmi_regmap;
   789	
   790		switch (type) {
   791		case HDMI_INFOFRAME_TYPE_AVI:
   792			/* write the first AVI infoframe data byte chunk(DB1-DB5) */
   793			regmap_bulk_write(regmap, HDMI_REG_AVI_DB1,
   794					  &buffer[HDMI_INFOFRAME_HEADER_SIZE],
   795					  HDMI_AVI_DB_CHUNK1_SIZE);
   796	
   797			/* write the second AVI infoframe data byte chunk(DB6-DB13) */
   798			regmap_bulk_write(regmap, HDMI_REG_AVI_DB6,
   799					  &buffer[HDMI_INFOFRAME_HEADER_SIZE +
   800						  HDMI_AVI_DB_CHUNK1_SIZE],
   801					  HDMI_AVI_DB_CHUNK2_SIZE);
   802	
   803			/* write checksum */
   804			regmap_write(regmap, HDMI_REG_AVI_CSUM, buffer[3]);
   805	
   806			regmap_write(regmap, HDMI_REG_AVI_INFOFRM_CTRL,
   807				     ENABLE_PKT | REPEAT_PKT);
   808			break;
   809		case HDMI_INFOFRAME_TYPE_VENDOR:
 > 810			const char zero_bulk[HDMI_PKT_HB_PB_CHUNK_SIZE] = { };
   811	
   812			/* clear NULL packet registers due to undefined default value */
   813			regmap_bulk_write(regmap, HDMI_REG_PKT_HB(0),
   814					  zero_bulk, sizeof(zero_bulk));
   815	
   816			/* write header and payload */
   817			regmap_bulk_write(regmap, HDMI_REG_PKT_HB(0), buffer, len);
   818	
   819			regmap_write(regmap, HDMI_REG_PKT_NULL_CTRL,
   820				     ENABLE_PKT | REPEAT_PKT);
   821			break;
   822		default:
   823			dev_dbg(it->dev, "unsupported HDMI infoframe 0x%x\n", type);
   824		}
   825	
   826		return 0;
   827	}
   828	

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