linux-kernel - [PATCH 4.4 087/146] drm: atmel-hlcdc: actually disable scaling when no scaling is required

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Message-Id: <20160725203524.990695394@linuxfoundation.org>
Date:	Mon, 25 Jul 2016 13:55:42 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Alex Vazquez <avazquez.dev@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: [PATCH 4.4 087/146] drm: atmel-hlcdc: actually disable scaling when no scaling is required

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Boris Brezillon <boris.brezillon@...e-electrons.com>

commit 1b7e38b92b0bbd363369f5160f13f4d26140972d upstream.

The driver is only enabling scaling, but never disabling it, thus, if you
enable the scaling feature once it stays enabled forever.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Reported-by: Alex Vazquez <avazquez.dev@...il.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@...el.com>
Fixes: 1a396789f65a ("drm: add Atmel HLCDC Display Controller support")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -335,6 +335,8 @@ atmel_hlcdc_plane_update_pos_and_size(st
 
 		atmel_hlcdc_layer_update_cfg(&plane->layer, 13, 0xffffffff,
 					     factor_reg);
+	} else {
+		atmel_hlcdc_layer_update_cfg(&plane->layer, 13, 0xffffffff, 0);
 	}
 }