linux-kernel - Re: [PATCH] video: mxsfb: Make sure axi clock is enabled when accessing registers

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Date:	Tue, 3 Mar 2015 22:08:17 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Liu Ying <Ying.Liu@...escale.com>
Cc:	linux-fbdev@...r.kernel.org, Peter Chen <peter.chen@...escale.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] video: mxsfb: Make sure axi clock is enabled when
 accessing registers

On Wed, Mar 04, 2015 at 01:58:55PM +0800, Liu Ying wrote:
> The LCDIF engines embedded in i.MX6sl and i.MX6sx SoCs need the axi clock
> as the engine's system clock.  The clock should be enabled when accessing
> LCDIF registers, otherwise the kernel would hang up.  We should also keep
> the clock being enabled when the engine is being active to scan out frames
> from memory.  This patch makes sure the axi clock is enabled when accessing
> registers so that the kernel hang up issue can be fixed.
> 
> Reported-by: Peter Chen <peter.chen@...escale.com>
> Signed-off-by: Liu Ying <Ying.Liu@...escale.com>
> ---
>  drivers/video/fbdev/mxsfb.c | 70 ++++++++++++++++++++++++++++++++++++---------
>  1 file changed, 56 insertions(+), 14 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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