Hi Ville,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on drm-tip/drm-tip next-20211015]
[cannot apply to airlied/drm-next v5.15-rc5]
[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]

url:    
https://github.com/0day-ci/linux/commits/Ville-Syrjala/drm-i915-Move-PCH-modeset-code-into-its-own-file/20211015-151850
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-randconfig-a011-20211014 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 
acb3b187c4c88650a6a717a1bcb234d27d0d7f54)
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
        # 
https://github.com/0day-ci/linux/commit/7512167c38e587a77b2ea0f87e8c68fff112804e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review 
Ville-Syrjala/drm-i915-Move-PCH-modeset-code-into-its-own-file/20211015-151850
        git checkout 7512167c38e587a77b2ea0f87e8c68fff112804e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 
ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_pch_display.c:437:6: error: no previous 
>> prototype for function 'lpt_disable_pch_transcoder' 
>> [-Werror,-Wmissing-prototypes]
   void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
        ^
   drivers/gpu/drm/i915/display/intel_pch_display.c:437:1: note: declare 
'static' if the function is not intended to be used outside of this translation 
unit
   void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
   ^
   static 
   1 error generated.


vim +/lpt_disable_pch_transcoder +437 
drivers/gpu/drm/i915/display/intel_pch_display.c

da423910ea902380 Ville Syrjälä 2021-10-15  436  
da423910ea902380 Ville Syrjälä 2021-10-15 @437  void 
lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
da423910ea902380 Ville Syrjälä 2021-10-15  438  {
da423910ea902380 Ville Syrjälä 2021-10-15  439          u32 val;
da423910ea902380 Ville Syrjälä 2021-10-15  440  
da423910ea902380 Ville Syrjälä 2021-10-15  441          val = 
intel_de_read(dev_priv, LPT_TRANSCONF);
da423910ea902380 Ville Syrjälä 2021-10-15  442          val &= ~TRANS_ENABLE;
da423910ea902380 Ville Syrjälä 2021-10-15  443          
intel_de_write(dev_priv, LPT_TRANSCONF, val);
da423910ea902380 Ville Syrjälä 2021-10-15  444          /* wait for PCH 
transcoder off, transcoder state */
da423910ea902380 Ville Syrjälä 2021-10-15  445          if 
(intel_de_wait_for_clear(dev_priv, LPT_TRANSCONF,
da423910ea902380 Ville Syrjälä 2021-10-15  446                                  
    TRANS_STATE_ENABLE, 50))
da423910ea902380 Ville Syrjälä 2021-10-15  447                  
drm_err(&dev_priv->drm, "Failed to disable PCH transcoder\n");
da423910ea902380 Ville Syrjälä 2021-10-15  448  
da423910ea902380 Ville Syrjälä 2021-10-15  449          /* Workaround: clear 
timing override bit. */
da423910ea902380 Ville Syrjälä 2021-10-15  450          val = 
intel_de_read(dev_priv, TRANS_CHICKEN2(PIPE_A));
da423910ea902380 Ville Syrjälä 2021-10-15  451          val &= 
~TRANS_CHICKEN2_TIMING_OVERRIDE;
da423910ea902380 Ville Syrjälä 2021-10-15  452          
intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
da423910ea902380 Ville Syrjälä 2021-10-15  453  }
da423910ea902380 Ville Syrjälä 2021-10-15  454  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]

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