[PATCH v4 18/26] drm: sun4i: de3: Implement AFBC support

[Dan Carpenter]

Hi Ryan,

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/Ryan-Walklin/drm-sun4i-de2-de3-Change-CSC-argument/20240921-175532
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git sunxi/for-next
patch link:    https://lore.kernel.org/r/20240921095153.213568-19-ryan%40testtoast.com
patch subject: [PATCH v4 18/26] drm: sun4i: de3: Implement AFBC support
config: microblaze-randconfig-r071-20240922 (https://download.01.org/0day-ci/archive/20240923/202409230531.ZMb79p9h-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 14.1.0

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 at intel.com>
| Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
| Closes: https://lore.kernel.org/r/202409230531.ZMb79p9h-lkp@intel.com/

smatch warnings:
drivers/gpu/drm/sun4i/sun50i_afbc.c:236 sun50i_afbc_atomic_update() warn: right shifting more than type allows 16 vs 16

vim +236 drivers/gpu/drm/sun4i/sun50i_afbc.c

757b2767d5472c Jernej Skrabec 2024-09-21  230  
757b2767d5472c Jernej Skrabec 2024-09-21  231  	regmap_write(regs, SUN50I_FBD_OVL_BG_COLOR(base),
757b2767d5472c Jernej Skrabec 2024-09-21  232  		     SUN8I_MIXER_BLEND_COLOR_BLACK);
757b2767d5472c Jernej Skrabec 2024-09-21  233  	regmap_write(regs, SUN50I_FBD_DEFAULT_COLOR0(base), def_color0);
757b2767d5472c Jernej Skrabec 2024-09-21  234  	regmap_write(regs, SUN50I_FBD_DEFAULT_COLOR1(base), def_color1);
757b2767d5472c Jernej Skrabec 2024-09-21  235  
757b2767d5472c Jernej Skrabec 2024-09-21 @236  	val = SUN50I_FBD_CTL_GLB_ALPHA(state->alpha >> 16);
                                                                               ^^^^^^^^^^^^^^^^^^
This shifts it to zero

757b2767d5472c Jernej Skrabec 2024-09-21  237  	val |= SUN50I_FBD_CTL_CLK_GATE;
757b2767d5472c Jernej Skrabec 2024-09-21  238  	val |= (state->alpha == DRM_BLEND_ALPHA_OPAQUE) ?
757b2767d5472c Jernej Skrabec 2024-09-21  239  		SUN50I_FBD_CTL_ALPHA_MODE_PIXEL :
757b2767d5472c Jernej Skrabec 2024-09-21  240  		SUN50I_FBD_CTL_ALPHA_MODE_COMBINED;
757b2767d5472c Jernej Skrabec 2024-09-21  241  	val |= SUN50I_FBD_CTL_FBD_EN;
757b2767d5472c Jernej Skrabec 2024-09-21  242  	regmap_write(regs, SUN50I_FBD_CTL(base), val);
757b2767d5472c Jernej Skrabec 2024-09-21  243  }

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