From 63a298f22a6183b5b7536a203596c6570dfcfe8e Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Tue, 6 Nov 2018 17:13:44 +0200
Subject: drm: rcar-du: Fix external clock error checks
Git-commit: 63a298f22a6183b5b7536a203596c6570dfcfe8e
Patch-mainline: v5.0-rc1
References: bsc#1113722

The rcar-du driver supports probe deferral for external clocks, but
implements it badly by checking the wrong pointer due to a bad copy and
paste. Fix it.

While at it, reject invalid clocks outright for DU channels that have a
display PLL, as the external clock is mandatory in that case. This
avoids a WARN_ON() at runtime.

Fixes: 1b30dbde8596 ("drm: rcar-du: Add support for external pixel clock")
Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -802,9 +802,16 @@ int rcar_du_crtc_create(struct rcar_du_g
 	clk = devm_clk_get(rcdu->dev, clk_name);
 	if (!IS_ERR(clk)) {
 		rcrtc->extclock = clk;
-	} else if (PTR_ERR(rcrtc->clock) == -EPROBE_DEFER) {
-		dev_info(rcdu->dev, "can't get external clock %u\n", hwindex);
+	} else if (PTR_ERR(clk) == -EPROBE_DEFER) {
 		return -EPROBE_DEFER;
+	} else if (rcdu->info->dpll_mask & BIT(hwindex)) {
+		/*
+		 * DU channels that have a display PLL can't use the internal
+		 * system clock and thus require an external clock.
+		 */
+		ret = PTR_ERR(clk);
+		dev_err(rcdu->dev, "can't get dclkin.%u: %d\n", hwindex, ret);
+		return ret;
 	}
 
 	init_waitqueue_head(&rcrtc->flip_wait);