drm/msm/dpu: add dpu_crtc_atomic_print_state

Implement CRTC's atomic_print_state() callback, printing DPU-specific
CRTC state (LM, CTL and DSPP ids).
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20211215160912.2715956-1-dmitry.baryshkov@linaro.org
[DB: marked cstate as const]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

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

@@ -924,6 +924,20 @@ static struct drm_crtc_state *dpu_crtc_duplicate_state(struct drm_crtc *crtc)
 	return &cstate->base;
 }
 
+static void dpu_crtc_atomic_print_state(struct drm_printer *p,
+					const struct drm_crtc_state *state)
+{
+	const struct dpu_crtc_state *cstate = to_dpu_crtc_state(state);
+	int i;
+
+	for (i = 0; i < cstate->num_mixers; i++) {
+		drm_printf(p, "\tlm[%d]=%d\n", i, cstate->mixers[i].hw_lm->idx - LM_0);
+		drm_printf(p, "\tctl[%d]=%d\n", i, cstate->mixers[i].lm_ctl->idx - CTL_0);
+		if (cstate->mixers[i].hw_dspp)
+			drm_printf(p, "\tdspp[%d]=%d\n", i, cstate->mixers[i].hw_dspp->idx - DSPP_0);
+	}
+}
+
 static void dpu_crtc_disable(struct drm_crtc *crtc,
 			     struct drm_atomic_state *state)
 {
@@ -1458,6 +1472,7 @@ static const struct drm_crtc_funcs dpu_crtc_funcs = {
 	.reset = dpu_crtc_reset,
 	.atomic_duplicate_state = dpu_crtc_duplicate_state,
 	.atomic_destroy_state = dpu_crtc_destroy_state,
+	.atomic_print_state = dpu_crtc_atomic_print_state,
 	.late_register = dpu_crtc_late_register,
 	.verify_crc_source = dpu_crtc_verify_crc_source,
 	.set_crc_source = dpu_crtc_set_crc_source,