Re: [PATCH v2 2/2] drm/bridge: add support for lontium lt9211c bridge

[kernel test robot <lkp@intel.com>]

Hi Nilesh,

kernel test robot noticed the following build errors:

[auto build test ERROR on f50b969bafafb2810a07f376387350c4c0d72a21]

url:    https://github.com/intel-lab-lkp/linux/commits/Nilesh-Laad/dt-bindings-bridge-lt9211c-Add-bindings/20251107-210546
base:   f50b969bafafb2810a07f376387350c4c0d72a21
patch link:    https://lore.kernel.org/r/20251107-add-lt9211c-bridge-v2-2-b0616e23407c%40oss.qualcomm.com
patch subject: [PATCH v2 2/2] drm/bridge: add support for lontium lt9211c bridge
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20251108/202511081122.TMw7Wy9r-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251108/202511081122.TMw7Wy9r-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511081122.TMw7Wy9r-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/lontium-lt9211c.c:207:48: warning: '&' within '|' [-Wbitwise-op-parentheses]
     207 |         ret = regmap_write(ctx->regmap, 0x8180, (pval & 0xfc | 0x03));
         |                                                  ~~~~~^~~~~~ ~
   drivers/gpu/drm/bridge/lontium-lt9211c.c:207:48: note: place parentheses around the '&' expression to silence this warning
     207 |         ret = regmap_write(ctx->regmap, 0x8180, (pval & 0xfc | 0x03));
         |                                                       ^
         |                                                  (          )
   drivers/gpu/drm/bridge/lontium-lt9211c.c:227:48: warning: '&' within '|' [-Wbitwise-op-parentheses]
     227 |         ret = regmap_write(ctx->regmap, 0x8530, (pval & 0xf8 | 0x11));
         |                                                  ~~~~~^~~~~~ ~
   drivers/gpu/drm/bridge/lontium-lt9211c.c:227:48: note: place parentheses around the '&' expression to silence this warning
     227 |         ret = regmap_write(ctx->regmap, 0x8530, (pval & 0xf8 | 0x11));
         |                                                       ^
         |                                                  (          )
   drivers/gpu/drm/bridge/lontium-lt9211c.c:253:5: warning: unused variable 'bc' [-Wunused-variable]
     253 |         u8 bc[3];
         |            ^~
   drivers/gpu/drm/bridge/lontium-lt9211c.c:619:48: warning: '&' within '|' [-Wbitwise-op-parentheses]
     619 |         ret = regmap_write(ctx->regmap, 0x8530, (pval & 0x3f | 0x40));
         |                                                  ~~~~~^~~~~~ ~
   drivers/gpu/drm/bridge/lontium-lt9211c.c:619:48: note: place parentheses around the '&' expression to silence this warning
     619 |         ret = regmap_write(ctx->regmap, 0x8530, (pval & 0x3f | 0x40));
         |                                                       ^
         |                                                  (          )
>> drivers/gpu/drm/bridge/lontium-lt9211c.c:918:14: error: incompatible function pointer types initializing 'int (*)(struct drm_bridge *, struct drm_encoder *, enum drm_bridge_attach_flags)' with an expression of type 'int (struct drm_bridge *, enum drm_bridge_attach_flags)' [-Wincompatible-function-pointer-types]
     918 |         .attach                 = lt9211c_attach,
         |                                   ^~~~~~~~~~~~~~
>> drivers/gpu/drm/bridge/lontium-lt9211c.c:920:20: error: incompatible function pointer types initializing 'void (*)(struct drm_bridge *, struct drm_atomic_state *)' with an expression of type 'void (struct drm_bridge *, struct drm_bridge_state *)' [-Wincompatible-function-pointer-types]
     920 |         .atomic_enable          = lt9211c_atomic_enable,
         |                                   ^~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/lontium-lt9211c.c:921:21: error: incompatible function pointer types initializing 'void (*)(struct drm_bridge *, struct drm_atomic_state *)' with an expression of type 'void (struct drm_bridge *, struct drm_bridge_state *)' [-Wincompatible-function-pointer-types]
     921 |         .atomic_disable         = lt9211c_atomic_disable,
         |                                   ^~~~~~~~~~~~~~~~~~~~~~
   4 warnings and 3 errors generated.


vim +918 drivers/gpu/drm/bridge/lontium-lt9211c.c

   916	
   917	static const struct drm_bridge_funcs lt9211c_funcs = {
 > 918		.attach			= lt9211c_attach,
   919		.mode_valid		= lt9211c_mode_valid,
 > 920		.atomic_enable		= lt9211c_atomic_enable,
   921		.atomic_disable		= lt9211c_atomic_disable,
   922		.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
   923		.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
   924		.atomic_get_input_bus_fmts = lt9211c_atomic_get_input_bus_fmts,
   925		.atomic_reset		= drm_atomic_helper_bridge_reset,
   926	};
   927	

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