linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:253:63: sparse: sparse: cast truncates bits from constant value (ffff becomes ff)

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Date:   Thu, 30 Nov 2023 16:34:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Leon Huang <Leon.Huang1@....com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:253:63:
 sparse: sparse: cast truncates bits from constant value (ffff becomes ff)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3b47bc037bd44f142ac09848e8d3ecccc726be99
commit: b8fe56375f78835db47565d91ea9d21767fe3c08 drm/amd/display: Refactor ABM feature
date:   8 months ago
config: sparc64-randconfig-r036-20230708 (https://download.01.org/0day-ci/archive/20231130/202311301656.jZFH7af7-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20231130/202311301656.jZFH7af7-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/202311301656.jZFH7af7-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:83:6: sparse: sparse: symbol 'dmub_abm_init' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:124:14: sparse: sparse: symbol 'dmub_abm_get_current_backlight' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:135:14: sparse: sparse: symbol 'dmub_abm_get_target_backlight' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:146:6: sparse: sparse: symbol 'dmub_abm_set_level' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:167:6: sparse: sparse: symbol 'dmub_abm_set_ambient_level' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:189:6: sparse: sparse: symbol 'dmub_abm_init_config' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:221:6: sparse: sparse: symbol 'dmub_abm_set_pause' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:241:6: sparse: sparse: symbol 'dmub_abm_set_pipe' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:263:6: sparse: sparse: symbol 'dmub_abm_set_backlight_level' was not declared. Should it be static?
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/slab.h, ...):
   include/linux/page-flags.h:246:46: sparse: sparse: self-comparison always evaluates to false
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:253:63: sparse: sparse: cast truncates bits from constant value (ffff becomes ff)

vim +253 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c

   240	
   241	bool dmub_abm_set_pipe(struct abm *abm, uint32_t otg_inst, uint32_t option, uint32_t panel_inst)
   242	{
   243		union dmub_rb_cmd cmd;
   244		struct dc_context *dc = abm->ctx;
   245		uint32_t ramping_boundary = 0xFFFF;
   246	
   247		memset(&cmd, 0, sizeof(cmd));
   248		cmd.abm_set_pipe.header.type = DMUB_CMD__ABM;
   249		cmd.abm_set_pipe.header.sub_type = DMUB_CMD__ABM_SET_PIPE;
   250		cmd.abm_set_pipe.abm_set_pipe_data.otg_inst = otg_inst;
   251		cmd.abm_set_pipe.abm_set_pipe_data.set_pipe_option = option;
   252		cmd.abm_set_pipe.abm_set_pipe_data.panel_inst = panel_inst;
 > 253		cmd.abm_set_pipe.abm_set_pipe_data.ramping_boundary = ramping_boundary;
   254		cmd.abm_set_pipe.header.payload_bytes = sizeof(struct dmub_cmd_abm_set_pipe_data);
   255	
   256		dc_dmub_srv_cmd_queue(dc->dmub_srv, &cmd);
   257		dc_dmub_srv_cmd_execute(dc->dmub_srv);
   258		dc_dmub_srv_wait_idle(dc->dmub_srv);
   259	
   260		return true;
   261	}
   262	

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