linux-kernel - Re: [PATCH 4/4] DRM: BRIDGE: TFP410: If connected, use I2C for polled HPD status.

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Message-ID: <CADL8D3bxCOwXU7NJ+jvN530LQByJCMRCGrH+HrGzCxR3+imZ2Q@mail.gmail.com>
Date:   Mon, 30 Jan 2023 11:24:18 -0500
From:   Jon Cormier <jcormier@...ticallink.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Jyri Sarha <jsarha@...com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michael Williamson <michael.williamson@...ticallink.com>,
        Bob Duke <bduke@...ticallink.com>
Subject: Re: [PATCH 4/4] DRM: BRIDGE: TFP410: If connected, use I2C for polled
 HPD status.

On Sat, Jan 28, 2023 at 7:47 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Jonathan,
>
> Thank you for the patch! Perhaps something to improve:
Good bot.
>
> [auto build test WARNING on 93f875a8526a291005e7f38478079526c843cbec]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Jonathan-Cormier/dt-bindings-display-bridge-tfp410-Add-tfp410-i2c-example/20230128-183627
> base:   93f875a8526a291005e7f38478079526c843cbec
> patch link:    https://lore.kernel.org/r/20230125-tfp410_i2c-v1-4-66a4d4e390b7%40criticallink.com
> patch subject: [PATCH 4/4] DRM: BRIDGE: TFP410: If connected, use I2C for polled HPD status.
> config: i386-randconfig-a006 (https://download.01.org/0day-ci/archive/20230129/202301290803.ouS19eab-lkp@intel.com/config)
> compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
> 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
>         # https://github.com/intel-lab-lkp/linux/commit/c4659fa4c02b62087c095ca99978e5eac8b490de
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Jonathan-Cormier/dt-bindings-display-bridge-tfp410-Add-tfp410-i2c-example/20230128-183627
>         git checkout c4659fa4c02b62087c095ca99978e5eac8b490de
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/bridge/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/gpu/drm/bridge/ti-tfp410.c:111:6: warning: unused variable 'val' [-Wunused-variable]
>            u32 val;
>                ^
>    1 warning generated.
This has already been fixed in V2 of the patch series.
>
>
> vim +/val +111 drivers/gpu/drm/bridge/ti-tfp410.c
>
>    106
>    107  static enum drm_connector_status
>    108  tfp410_connector_detect(struct drm_connector *connector, bool force)
>    109  {
>    110          struct tfp410 *dvi = drm_connector_to_tfp410(connector);
>  > 111          u32 val;
>    112          unsigned int ret;
>    113
>    114          if (dvi->i2c) {
>    115                  ret = regmap_test_bits(dvi->regmap, TFP410_REG_CTL_2_MODE, TFP410_BIT_HTPLG);
>    116                  if (ret < 0)
>    117                          dev_err(dvi->dev, "%s failed to read HTPLG bit : %d\n", __func__, ret);
>    118                  else
>    119                          return ret ? connector_status_connected : connector_status_disconnected;
>    120          }
>    121
>    122          return drm_bridge_detect(dvi->next_bridge);
>    123  }
>    124
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests