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Message-ID: <202601272315.09SFioVt-lkp@intel.com>
Date: Tue, 27 Jan 2026 23:39:34 +0800
From: kernel test robot <lkp@...el.com>
To: Joey Lu <a0987203069@...il.com>, airlied@...il.com, simona@...ll.ch,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, robh@...nel.org, krzk+dt@...nel.org,
conor+dt@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
ychuang3@...oton.com, schung@...oton.com, yclu4@...oton.com,
a0987203069@...il.com, linux-arm-kernel@...ts.infradead.org,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] drm/nuvoton: add MA35D1 display controller driver
Hi Joey,
kernel test robot noticed the following build errors:
[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on drm/drm-next]
[cannot apply to robh/for-next linus/master v6.19-rc7 next-20260126]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Joey-Lu/dt-bindings-display-nuvoton-add-MA35D1-DCU-binding/20260126-170258
base: https://gitlab.freedesktop.org/drm/misc/kernel.git drm-misc-next
patch link: https://lore.kernel.org/r/20260126085727.2568958-4-a0987203069%40gmail.com
patch subject: [PATCH 3/3] drm/nuvoton: add MA35D1 display controller driver
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260127/202601272315.09SFioVt-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260127/202601272315.09SFioVt-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/202601272315.09SFioVt-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
>> drivers/gpu/drm/nuvoton/ma35_plane.c:177:10: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
177 | *reg = MA35_BLEND_MODE_SRC;
| ^
drivers/gpu/drm/nuvoton/ma35_plane.h:141:2: note: expanded from macro 'MA35_BLEND_MODE_SRC'
141 | FIELD_PREP(MA35_SRC_BLENDING_MODE, MA35_ALPHA_BLEND_ONE)
| ^
drivers/gpu/drm/nuvoton/ma35_plane.c:337:8: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
337 | reg = FIELD_PREP(MA35_OVERLAY_POSITION_X_MASK, x) |
| ^
drivers/gpu/drm/nuvoton/ma35_plane.c:360:9: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
360 | reg = FIELD_PREP(MA35_PRIMARY_FORMAT_MASK, format) |
| ^
drivers/gpu/drm/nuvoton/ma35_plane.c:384:9: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
384 | reg = FIELD_PREP(MA35_OVERLAY_FORMAT_MASK, format) |
| ^
drivers/gpu/drm/nuvoton/ma35_plane.c:441:8: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
441 | reg = FIELD_PREP(MA35_CURSOR_X_MASK, x) |
| ^
drivers/gpu/drm/nuvoton/ma35_plane.c:483:4: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
483 | FIELD_PREP(MA35_CURSOR_HOTSPOT_X_MASK, new_state->hotspot_x) |
| ^
drivers/gpu/drm/nuvoton/ma35_plane.c:537:4: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
537 | FIELD_PREP(MA35_CURSOR_HOTSPOT_X_MASK, new_state->hotspot_x) |
| ^
7 errors generated.
--
>> drivers/gpu/drm/nuvoton/ma35_crtc.c:97:8: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
97 | reg = FIELD_PREP(MA35_DISPLAY_TOTAL_MASK, mode->htotal) |
| ^
>> drivers/gpu/drm/nuvoton/ma35_crtc.c:228:10: error: call to undeclared function 'FIELD_GET'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
228 | *hpos = FIELD_GET(MA35_DISPLAY_CURRENT_X, reg);
| ^
drivers/gpu/drm/nuvoton/ma35_crtc.c:284:9: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
284 | reg = FIELD_PREP(MA35_GAMMA_RED_MASK, r[i]) |
| ^
3 errors generated.
--
>> drivers/gpu/drm/nuvoton/ma35_interface.c:150:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
150 | if (!interface) {
| ^~~~~~~~~~
drivers/gpu/drm/nuvoton/ma35_interface.c:191:9: note: uninitialized use occurs here
191 | return ret;
| ^~~
drivers/gpu/drm/nuvoton/ma35_interface.c:150:2: note: remove the 'if' if its condition is always false
150 | if (!interface) {
| ^~~~~~~~~~~~~~~~~
151 | drm_err(drm_dev, "Failed to initialize encoder\n");
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
152 | goto error_early;
| ~~~~~~~~~~~~~~~~~
153 | }
| ~
drivers/gpu/drm/nuvoton/ma35_interface.c:145:9: note: initialize the variable 'ret' to silence this warning
145 | int ret;
| ^
| = 0
1 warning generated.
vim +/FIELD_PREP +177 drivers/gpu/drm/nuvoton/ma35_plane.c
167
168 static int ma35_layer_blend_mode_select(u32 mode, u32 *reg)
169 {
170 u32 ret = 0;
171
172 switch (mode) {
173 case MA35_ALPHA_CLEAR:
174 *reg = MA35_BLEND_MODE_CLEAR;
175 break;
176 case MA35_ALPHA_SRC:
> 177 *reg = MA35_BLEND_MODE_SRC;
178 break;
179 case MA35_ALPHA_DST:
180 *reg = MA35_BLEND_MODE_DST;
181 break;
182 case MA35_ALPHA_SRC_OVER:
183 *reg = MA35_BLEND_MODE_SRC_OVER;
184 break;
185 case MA35_ALPHA_DST_OVER:
186 *reg = MA35_BLEND_MODE_DST_OVER;
187 break;
188 case MA35_ALPHA_SRC_IN:
189 *reg = MA35_BLEND_MODE_SRC_IN;
190 break;
191 case MA35_ALPHA_DST_IN:
192 *reg = MA35_BLEND_MODE_DST_IN;
193 break;
194 case MA35_ALPHA_SRC_OUT:
195 *reg = MA35_BLEND_MODE_SRC_OUT;
196 break;
197 case MA35_ALPHA_DST_OUT:
198 *reg = MA35_BLEND_MODE_DST_OUT;
199 break;
200 case MA35_ALPHA_SRC_ATOP:
201 *reg = MA35_BLEND_MODE_SRC_ATOP;
202 break;
203 case MA35_ALPHA_DST_ATOP:
204 *reg = MA35_BLEND_MODE_DST_ATOP;
205 break;
206 case MA35_ALPHA_XOR:
207 *reg = MA35_BLEND_MODE_XOR;
208 break;
209 default:
210 ret = -EINVAL;
211 }
212
213 return ret;
214 }
215
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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