[Intel-gfx] [PATCH 9/9] drm/i915: Introduce lpt_pch_disable()

[kernel test robot]

Hi Ville,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING 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-a005-20211014 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # 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
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_pch_display.c:437:6: warning: no previous prototype for 'lpt_disable_pch_transcoder' [-Wmissing-prototypes]
     437 | void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~


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

da423910ea9023 Ville Syrjälä 2021-10-15  436  
da423910ea9023 Ville Syrjälä 2021-10-15 @437  void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
da423910ea9023 Ville Syrjälä 2021-10-15  438  {
da423910ea9023 Ville Syrjälä 2021-10-15  439  	u32 val;
da423910ea9023 Ville Syrjälä 2021-10-15  440  
da423910ea9023 Ville Syrjälä 2021-10-15  441  	val = intel_de_read(dev_priv, LPT_TRANSCONF);
da423910ea9023 Ville Syrjälä 2021-10-15  442  	val &= ~TRANS_ENABLE;
da423910ea9023 Ville Syrjälä 2021-10-15  443  	intel_de_write(dev_priv, LPT_TRANSCONF, val);
da423910ea9023 Ville Syrjälä 2021-10-15  444  	/* wait for PCH transcoder off, transcoder state */
da423910ea9023 Ville Syrjälä 2021-10-15  445  	if (intel_de_wait_for_clear(dev_priv, LPT_TRANSCONF,
da423910ea9023 Ville Syrjälä 2021-10-15  446  				    TRANS_STATE_ENABLE, 50))
da423910ea9023 Ville Syrjälä 2021-10-15  447  		drm_err(&dev_priv->drm, "Failed to disable PCH transcoder\n");
da423910ea9023 Ville Syrjälä 2021-10-15  448  
da423910ea9023 Ville Syrjälä 2021-10-15  449  	/* Workaround: clear timing override bit. */
da423910ea9023 Ville Syrjälä 2021-10-15  450  	val = intel_de_read(dev_priv, TRANS_CHICKEN2(PIPE_A));
da423910ea9023 Ville Syrjälä 2021-10-15  451  	val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
da423910ea9023 Ville Syrjälä 2021-10-15  452  	intel_de_write(dev_priv, TRANS_CHICKEN2(PIPE_A), val);
da423910ea9023 Ville Syrjälä 2021-10-15  453  }
da423910ea9023 Ville Syrjälä 2021-10-15  454  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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