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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Liam Beguin <lbeguin@tycoint.com>,
        Sylvain Lemieux <slemieux@tycoint.com>,
        Vladimir Zapolskiy <vz@mleia.com>,
        Russell King <linux@armlinux.org.uk>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.9 120/241] video: ARM CLCD: fix dma allocation size
Date:   Mon, 19 Mar 2018 19:06:25 +0100
Message-Id: <20180319180756.167761260@linuxfoundation.org>
In-Reply-To: <20180319180751.172155436@linuxfoundation.org>
References: <20180319180751.172155436@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Liam Beguin <lbeguin@tycoint.com>


[ Upstream commit 9a1c779e6b06855e41099caa6f15b3b584dfa88c ]

This patch forces the frambuffer size to be aligned on kernel pages.

During the board startup, the splash screed did appear;
the "ts_test" program or our application were not able to start.

The following error message was reported:
error: failed to map framebuffer device to memory.
LinuxFB: driver cannot connect

The issue was discovered, on the LPC32xx platform, during the migration
of the LCD definition from the board file to the device tree.

Signed-off-by: Liam Beguin <lbeguin@tycoint.com>
Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/video/fbdev/amba-clcd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/video/fbdev/amba-clcd.c
+++ b/drivers/video/fbdev/amba-clcd.c
@@ -892,8 +892,8 @@ static int clcdfb_of_dma_setup(struct cl
 	if (err)
 		return err;
 
-	framesize = fb->panel->mode.xres * fb->panel->mode.yres *
-			fb->panel->bpp / 8;
+	framesize = PAGE_ALIGN(fb->panel->mode.xres * fb->panel->mode.yres *
+			fb->panel->bpp / 8);
 	fb->fb.screen_base = dma_alloc_coherent(&fb->dev->dev, framesize,
 			&dma, GFP_KERNEL);
 	if (!fb->fb.screen_base)