linux-kernel - [superna9999:amlogic/v5.17/g12-dsi 20/23] drivers/gpu/drm/meson/meson_encoder_dsi.c:59:37: error: passing 'const struct drm_display_mode *' to parameter of type 'struct drm_display

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Date:   Sat, 11 Dec 2021 12:50:38 +0800
From:   kernel test robot <lkp@...el.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [superna9999:amlogic/v5.17/g12-dsi 20/23]
 drivers/gpu/drm/meson/meson_encoder_dsi.c:59:37: error: passing 'const
 struct drm_display_mode *' to parameter of type 'struct drm_display_mode *'
 discards qualifiers

tree:   https://github.com/superna9999/linux amlogic/v5.17/g12-dsi
head:   62dac9179f2937dc08bffe08d15c6846bc4aedb4
commit: b186318175a12bdca613ee26b4b452964c795eb3 [20/23] fixup! WIP: drm/meson: add DSI encoder
config: arm-randconfig-r033-20211210 (https://download.01.org/0day-ci/archive/20211211/202112111247.XKv1vmaF-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/superna9999/linux/commit/b186318175a12bdca613ee26b4b452964c795eb3
        git remote add superna9999 https://github.com/superna9999/linux
        git fetch --no-tags superna9999 amlogic/v5.17/g12-dsi
        git checkout b186318175a12bdca613ee26b4b452964c795eb3
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/meson/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/meson/meson_encoder_dsi.c:59:37: error: passing 'const struct drm_display_mode *' to parameter of type 'struct drm_display_mode *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           meson_venc_mipi_dsi_mode_set(priv, mode);
                                              ^~~~
   drivers/gpu/drm/meson/meson_venc.h:71:32: note: passing argument to parameter 'mode' here
                                     struct drm_display_mode *mode);
                                                              ^
   drivers/gpu/drm/meson/meson_encoder_dsi.c:130:69: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
                   dev_err(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret);
                                                                                     ^~~
   include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err'
           dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
                                                                          ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
                   _p_func(dev, fmt, ##__VA_ARGS__);                       \
                                       ^~~~~~~~~~~
   drivers/gpu/drm/meson/meson_encoder_dsi.c:109:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning and 1 error generated.


vim +59 drivers/gpu/drm/meson/meson_encoder_dsi.c

6b197be782e041 Neil Armstrong 2021-12-09  47  
b186318175a12b Neil Armstrong 2021-12-10  48  static void meson_encoder_dsi_mode_set(struct drm_bridge *bridge,
b186318175a12b Neil Armstrong 2021-12-10  49  					const struct drm_display_mode *mode,
b186318175a12b Neil Armstrong 2021-12-10  50  					const struct drm_display_mode *adjusted_mode)
6b197be782e041 Neil Armstrong 2021-12-09  51  {
6b197be782e041 Neil Armstrong 2021-12-09  52  	struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
6b197be782e041 Neil Armstrong 2021-12-09  53  	struct meson_drm *priv = encoder_dsi->priv;
6b197be782e041 Neil Armstrong 2021-12-09  54  
b186318175a12b Neil Armstrong 2021-12-10  55  	pr_err("%s:%d\n", __func__, __LINE__);
6b197be782e041 Neil Armstrong 2021-12-09  56  
b186318175a12b Neil Armstrong 2021-12-10  57  	meson_vclk_setup(priv, MESON_VCLK_TARGET_DSI, mode->clock, 0, 0, 0, false);
6b197be782e041 Neil Armstrong 2021-12-09  58  
d521159dd8a996 Neil Armstrong 2021-12-10 @59  	meson_venc_mipi_dsi_mode_set(priv, mode);
e1e87e576f5bef Neil Armstrong 2021-12-09  60  	meson_encl_load_gamma(priv);
6b197be782e041 Neil Armstrong 2021-12-09  61  
b186318175a12b Neil Armstrong 2021-12-10  62  	writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
b186318175a12b Neil Armstrong 2021-12-10  63  
e1e87e576f5bef Neil Armstrong 2021-12-09  64  	writel_bits_relaxed(BIT(3), BIT(3), priv->io_base + _REG(ENCL_VIDEO_MODE_ADV));
e1e87e576f5bef Neil Armstrong 2021-12-09  65  	writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN));
b186318175a12b Neil Armstrong 2021-12-10  66  }
b186318175a12b Neil Armstrong 2021-12-10  67  

:::::: The code at line 59 was first introduced by commit
:::::: d521159dd8a996678230b50e4ecafcdf50648c52 fixup! WIP: drm/meson: add DSI encoder

:::::: TO: Neil Armstrong <narmstrong@...libre.com>
:::::: CC: Neil Armstrong <narmstrong@...libre.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org