linux-kernel - Re: [PATCH v1 2/3] drm/panel: st7701: Add support for SPI for configuration

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Date: Fri, 21 Jun 2024 09:45:24 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Hironori KIKUCHI <kikuchan98@...il.com>,
	linux-kernel@...r.kernel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
	Hironori KIKUCHI <kikuchan98@...il.com>,
	Jagan Teki <jagan@...rulasolutions.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Sam Ravnborg <sam@...nborg.org>, David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v1 2/3] drm/panel: st7701: Add support for SPI for
 configuration

Hi Hironori,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Hironori-KIKUCHI/dt-bindings-display-st7701-Add-Anbernic-RG28XX-panel/20240618-161849
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20240618081515.1215552-3-kikuchan98%40gmail.com
patch subject: [PATCH v1 2/3] drm/panel: st7701: Add support for SPI for configuration
config: i386-randconfig-141-20240621 (https://download.01.org/0day-ci/archive/20240621/202406210841.Q17G5ISz-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0

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>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202406210841.Q17G5ISz-lkp@intel.com/

smatch warnings:
drivers/gpu/drm/panel/panel-sitronix-st7701.c:1076 st7701_dsi_probe() warn: passing zero to 'dev_err_probe'

vim +/dev_err_probe +1076 drivers/gpu/drm/panel/panel-sitronix-st7701.c

433b7d46874577 Hironori KIKUCHI 2024-06-18  1062  static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
433b7d46874577 Hironori KIKUCHI 2024-06-18  1063  {
433b7d46874577 Hironori KIKUCHI 2024-06-18  1064  	struct st7701 *st7701;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1065  	int err;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1066  
433b7d46874577 Hironori KIKUCHI 2024-06-18  1067  	err = st7701_probe(&dsi->dev, DRM_MODE_CONNECTOR_DSI);
433b7d46874577 Hironori KIKUCHI 2024-06-18  1068  	if (err)
433b7d46874577 Hironori KIKUCHI 2024-06-18  1069  		return err;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1070  
433b7d46874577 Hironori KIKUCHI 2024-06-18  1071  	st7701 = dev_get_drvdata(&dsi->dev);
849b2e3ff96982 Jagan Teki       2019-01-25  1072  	st7701->dsi = dsi;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1073  	st7701->write_command = st7701_dsi_write;
849b2e3ff96982 Jagan Teki       2019-01-25  1074  
433b7d46874577 Hironori KIKUCHI 2024-06-18  1075  	if (!st7701->desc->lanes)
433b7d46874577 Hironori KIKUCHI 2024-06-18 @1076  		return dev_err_probe(&dsi->dev, err, "This panel is not for MIPI DSI\n");
                                                                                                ^^^
-EINVAL?

433b7d46874577 Hironori KIKUCHI 2024-06-18  1077  
433b7d46874577 Hironori KIKUCHI 2024-06-18  1078  	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
433b7d46874577 Hironori KIKUCHI 2024-06-18  1079  			  MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1080  	dsi->format = st7701->desc->format;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1081  	dsi->lanes = st7701->desc->lanes;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1082  
433b7d46874577 Hironori KIKUCHI 2024-06-18  1083  	mipi_dsi_set_drvdata(dsi, st7701);
433b7d46874577 Hironori KIKUCHI 2024-06-18  1084  
433b7d46874577 Hironori KIKUCHI 2024-06-18  1085  	err = mipi_dsi_attach(dsi);
433b7d46874577 Hironori KIKUCHI 2024-06-18  1086  	if (err)
433b7d46874577 Hironori KIKUCHI 2024-06-18  1087  		return dev_err_probe(&dsi->dev, err, "Failed to init MIPI DSI\n");
c62102165dd792 Marek Vasut      2022-10-15  1088  
c62102165dd792 Marek Vasut      2022-10-15  1089  	return 0;
433b7d46874577 Hironori KIKUCHI 2024-06-18  1090  }

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