linux-kernel - [PATCH 1/3] mx3fb: do not support panning with fb blanked

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Date:	Mon, 11 Jun 2012 09:06:48 +0800
From:	Liu Ying <Ying.Liu@...escale.com>
To:	<g.liakhovetski@....de>
CC:	<liu.y.victor@...il.com>, <FlorianSchandinat@....de>,
	<linux-fbdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Liu Ying <Ying.Liu@...escale.com>
Subject: [PATCH 1/3] mx3fb: do not support panning with fb blanked

This patch checks if framebuffer is unblanked before
we actually trigger panning in custom pan display
function.

Signed-off-by: Liu Ying <Ying.Liu@...escale.com>
---
 drivers/video/mx3fb.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index e3406ab..d53db60 100644
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -1063,6 +1063,11 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
 	dev_dbg(fbi->device, "%s [%c]\n", __func__,
 		list_empty(&mx3_fbi->idmac_channel->queue) ? '-' : '+');
 
+	if (mx3_fbi->blank != FB_BLANK_UNBLANK) {
+		dev_dbg(fbi->device, "panning with fb blanked not supported\n");
+		return -EFAULT;
+	}
+
 	if (var->xoffset > 0) {
 		dev_dbg(fbi->device, "x panning not supported\n");
 		return -EINVAL;
-- 
1.7.1


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