From: Thierry Reding <thierry.reding@avionic-design.de>
Date: Mon, 18 Mar 2013 10:09:13 +0000 (+0100)
Subject: drm/tegra: Don't disable unused planes
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2678aeba5fe1a799788cce2a34003d8fa6ad7153;p=linux-beck.git

drm/tegra: Don't disable unused planes

When a plane isn't in use it isn't attached to a CRTC and therefore the
DC registers aren't available for programming.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
---

diff --git a/drivers/gpu/host1x/drm/dc.c b/drivers/gpu/host1x/drm/dc.c
index 8c04943f82e3..98f60d827558 100644
--- a/drivers/gpu/host1x/drm/dc.c
+++ b/drivers/gpu/host1x/drm/dc.c
@@ -79,6 +79,9 @@ static int tegra_plane_disable(struct drm_plane *plane)
 	struct tegra_plane *p = to_tegra_plane(plane);
 	unsigned long value;
 
+	if (!plane->crtc)
+		return 0;
+
 	value = WINDOW_A_SELECT << p->index;
 	tegra_dc_writel(dc, value, DC_CMD_DISPLAY_WINDOW_HEADER);