drm/msm/dpu: drop dpu_plane_pipe function

There no more need for the dpu_plane_pipe() function, crtc code can
access pstate->pipe_hw.idx directly.
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Tested-by: Abhinav Kumar <quic_abhinavk@quicinc.com> # sc7280
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/527320/
Link: https://lore.kernel.org/r/20230316161653.4106395-7-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -432,7 +432,7 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
 		pstate = to_dpu_plane_state(state);
 		fb = state->fb;
 
-		sspp_idx = dpu_plane_pipe(plane);
+		sspp_idx = pstate->hw_sspp->idx;
 		set_bit(sspp_idx, fetch_active);
 
 		DRM_DEBUG_ATOMIC("crtc %d stage:%d - plane %d sspp %d fb %d\n",
@@ -1227,7 +1227,7 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
 		pstates[cnt].dpu_pstate = dpu_pstate;
 		pstates[cnt].drm_pstate = pstate;
 		pstates[cnt].stage = pstate->normalized_zpos;
-		pstates[cnt].pipe_id = dpu_plane_pipe(plane);
+		pstates[cnt].pipe_id = to_dpu_plane_state(pstate)->hw_sspp->idx;
 
 		dpu_pstate->needs_dirtyfb = needs_dirtyfb;
 

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

@@ -1443,11 +1443,6 @@ static const struct drm_plane_helper_funcs dpu_plane_helper_funcs = {
 		.atomic_update = dpu_plane_atomic_update,
 };
 
-enum dpu_sspp dpu_plane_pipe(struct drm_plane *plane)
-{
-	return plane ? to_dpu_plane(plane)->pipe : SSPP_NONE;
-}
-
 /* initialize plane */
 struct drm_plane *dpu_plane_init(struct drm_device *dev,
 		uint32_t pipe, enum drm_plane_type type,

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h

@@ -59,13 +59,6 @@ struct dpu_multirect_plane_states {
 #define to_dpu_plane_state(x) \
 	container_of(x, struct dpu_plane_state, base)
 
-/**
- * dpu_plane_pipe - return sspp identifier for the given plane
- * @plane:   Pointer to DRM plane object
- * Returns: sspp identifier of the given plane
- */
-enum dpu_sspp dpu_plane_pipe(struct drm_plane *plane);
-
 /**
  * dpu_plane_flush - final plane operations before commit flush
  * @plane: Pointer to drm plane structure