tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   274d7803837da78dfc911bcda0d593412676fc20
commit: 957fe62d7d15f43d49e8cbacafaff8ede7d6cb30 [4750/11993] drm: rcar-du: Fix DSI enable & disable sequence
config: arm-randconfig-r005-20221001
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=957fe62d7d15f43d49e8cbacafaff8ede7d6cb30
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 957fe62d7d15f43d49e8cbacafaff8ede7d6cb30
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_enable':
>> drivers/gpu/drm/rcar-du/rcar_du_crtc.c:760: undefined reference to `rcar_mipi_dsi_pclk_enable'
   arm-linux-gnueabi-ld: drivers/gpu/drm/rcar-du/rcar_du_crtc.o: in function `rcar_du_crtc_atomic_disable':
>> drivers/gpu/drm/rcar-du/rcar_du_crtc.c:806: undefined reference to `rcar_mipi_dsi_pclk_disable'


vim +760 drivers/gpu/drm/rcar-du/rcar_du_crtc.c

   725	
   726	static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
   727					       struct drm_atomic_state *state)
   728	{
   729		struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
   730		struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(crtc->state);
   731		struct rcar_du_device *rcdu = rcrtc->dev;
   732	
   733		if (rcrtc->cmm)
   734			rcar_cmm_enable(rcrtc->cmm);
   735		rcar_du_crtc_get(rcrtc);
   736	
   737		/*
   738		 * On D3/E3 the dot clock is provided by the LVDS encoder attached to
   739		 * the DU channel. We need to enable its clock output explicitly if
   740		 * the LVDS output is disabled.
   741		 */
   742		if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) &&
   743		    rstate->outputs == BIT(RCAR_DU_OUTPUT_DPAD0)) {
   744			struct drm_bridge *bridge = rcdu->lvds[rcrtc->index];
   745			const struct drm_display_mode *mode =
   746				&crtc->state->adjusted_mode;
   747	
   748			rcar_lvds_pclk_enable(bridge, mode->clock * 1000);
   749		}
   750	
   751		/*
   752		 * Similarly to LVDS, on V3U the dot clock is provided by the DSI
   753		 * encoder, and we need to enable the DSI clocks before enabling the CRTC.
   754		 */
   755		if ((rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) &&
   756		    (rstate->outputs &
   757		     (BIT(RCAR_DU_OUTPUT_DSI0) | BIT(RCAR_DU_OUTPUT_DSI1)))) {
   758			struct drm_bridge *bridge = rcdu->dsi[rcrtc->index];
   759	
 > 760			rcar_mipi_dsi_pclk_enable(bridge, state);
   761		}
   762	
   763		rcar_du_crtc_start(rcrtc);
   764	
   765		/*
   766		 * TODO: The chip manual indicates that CMM tables should be written
   767		 * after the DU channel has been activated. Investigate the impact
   768		 * of this restriction on the first displayed frame.
   769		 */
   770		rcar_du_cmm_setup(crtc);
   771	}
   772	
   773	static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
   774						struct drm_atomic_state *state)
   775	{
   776		struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
   777										 crtc);
   778		struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
   779		struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(old_state);
   780		struct rcar_du_device *rcdu = rcrtc->dev;
   781	
   782		rcar_du_crtc_stop(rcrtc);
   783		rcar_du_crtc_put(rcrtc);
   784	
   785		if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) &&
   786		    rstate->outputs == BIT(RCAR_DU_OUTPUT_DPAD0)) {
   787			struct drm_bridge *bridge = rcdu->lvds[rcrtc->index];
   788	
   789			/*
   790			 * Disable the LVDS clock output, see
   791			 * rcar_du_crtc_atomic_enable().
   792			 */
   793			rcar_lvds_pclk_disable(bridge);
   794		}
   795	
   796		if ((rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) &&
   797		    (rstate->outputs &
   798		     (BIT(RCAR_DU_OUTPUT_DSI0) | BIT(RCAR_DU_OUTPUT_DSI1)))) {
   799			struct drm_bridge *bridge = rcdu->dsi[rcrtc->index];
   800	
   801			/*
   802			 * Disable the DSI clock output, see
   803			 * rcar_du_crtc_atomic_enable().
   804			 */
   805	
 > 806			rcar_mipi_dsi_pclk_disable(bridge);
   807		}
   808	
   809		spin_lock_irq(&crtc->dev->event_lock);
   810		if (crtc->state->event) {
   811			drm_crtc_send_vblank_event(crtc, crtc->state->event);
   812			crtc->state->event = NULL;
   813		}
   814		spin_unlock_irq(&crtc->dev->event_lock);
   815	}
   816	

-- 
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