linux-kernel - Re: [PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver

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Message-ID: <202412070721.9tZI9Ogl-lkp@intel.com>
Date: Mon, 9 Dec 2024 11:40:50 +0800
From: kernel test robot <lkp@...el.com>
To: Nick Chan <towinchenmi@...il.com>, Lee Jones <lee@...nel.org>,
	Daniel Thompson <danielt@...nel.org>,
	Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@....cz>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Helge Deller <deller@....de>,
	Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org
Cc: oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver

Hi Nick,

kernel test robot noticed the following build errors:

[auto build test ERROR on 40384c840ea1944d7c5a392e8975ed088ecf0b37]

url:    https://github.com/intel-lab-lkp/linux/commits/Nick-Chan/dt-bindings-leds-backlight-apple-dwi-bl-Add-bindings-for-Apple-DWI-backlight/20241207-013254
base:   40384c840ea1944d7c5a392e8975ed088ecf0b37
patch link:    https://lore.kernel.org/r/20241206172735.4310-3-towinchenmi%40gmail.com
patch subject: [PATCH 2/3] backlight: dwi_bl: Add Apple DWI backlight driver
config: arc-randconfig-001-20241207 (https://download.01.org/0day-ci/archive/20241207/202412070721.9tZI9Ogl-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241207/202412070721.9tZI9Ogl-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/202412070721.9tZI9Ogl-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/video/backlight/dwi_bl.c: In function 'dwi_bl_update_status':
>> drivers/video/backlight/dwi_bl.c:46:16: error: implicit declaration of function 'FIELD_PREP' [-Werror=implicit-function-declaration]
      46 |         cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness);
         |                ^~~~~~~~~~
   drivers/video/backlight/dwi_bl.c: In function 'dwi_bl_get_brightness':
>> drivers/video/backlight/dwi_bl.c:61:16: error: implicit declaration of function 'FIELD_GET' [-Werror=implicit-function-declaration]
      61 |         return FIELD_GET(DWI_BL_CMD_DATA, cmd);
         |                ^~~~~~~~~
   cc1: some warnings being treated as errors


vim +/FIELD_PREP +46 drivers/video/backlight/dwi_bl.c

    37	
    38	static int dwi_bl_update_status(struct backlight_device *bl)
    39	{
    40		struct apple_dwi_bl *dwi_bl = bl_get_data(bl);
    41	
    42		int brightness = backlight_get_brightness(bl);
    43	
    44		u32 cmd = 0;
    45	
  > 46		cmd |= FIELD_PREP(DWI_BL_CMD_DATA, brightness);
    47		cmd |= FIELD_PREP(DWI_BL_CMD_TYPE, DWI_BL_CMD_TYPE_SET_BRIGHTNESS);
    48	
    49		writel(cmd, dwi_bl->base + DWI_BL_CMD);
    50		writel(DWI_BL_CTL_SEND, dwi_bl->base + DWI_BL_CTL);
    51	
    52		return 0;
    53	}
    54	
    55	static int dwi_bl_get_brightness(struct backlight_device *bl)
    56	{
    57		struct apple_dwi_bl *dwi_bl = bl_get_data(bl);
    58	
    59		u32 cmd = readl(dwi_bl->base + DWI_BL_CMD);
    60	
  > 61		return FIELD_GET(DWI_BL_CMD_DATA, cmd);
    62	}
    63	

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