linux-kernel - Re: [PATCH] ARM: dts: imx7d: fix LCDIF clock assignment

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Date:   Mon, 5 Dec 2016 10:01:24 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>
Cc:     Sascha Hauer <kernel@...gutronix.de>,
        Stefan Agner <stefan@...er.ch>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>, robh+dt@...nel.org,
        Peter Chen <peter.chen@...escale.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Liu Ying <Ying.Liu@...escale.com>,
        linux-arm-kernel@...ts.infradead.org,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH] ARM: dts: imx7d: fix LCDIF clock assignment

Hi Arnd, Olof,

On Sun, Dec 04, 2016 at 05:26:58PM -0800, Stefan Agner wrote:
> Hi Shawn
> 
> On 2016-11-23 15:02, Fabio Estevam wrote:
> > On Tue, Nov 22, 2016 at 10:42 PM, Stefan Agner <stefan@...er.ch> wrote:
> >> The eLCDIF IP of the i.MX 7 SoC knows multiple clocks and lists them
> >> separately:
> >>
> >> Clock      Clock Root              Description
> >> apb_clk    MAIN_AXI_CLK_ROOT       AXI clock
> >> pix_clk    LCDIF_PIXEL_CLK_ROOT    Pixel clock
> >> ipg_clk_s  MAIN_AXI_CLK_ROOT       Peripheral access clock
> >>
> >> All of them are switched by a single gate, which is part of the
> >> IMX7D_LCDIF_PIXEL_ROOT_CLK clock. Hence using that clock also for
> >> the AXI bus clock (clock-name "axi") makes sure the gate gets
> >> enabled when accessing registers.
> >>
> >> There seem to be no separate AXI display clock, and the clock is
> >> optional. Hence remove the dummy clock.
> >>
> >> This fixes kernel freezes when starting the X-Server (which
> >> disables/re-enables the display controller).
> >>
> >> Signed-off-by: Stefan Agner <stefan@...er.ch>
> > 
> > Reviewed-by: Fabio Estevam <fabio.estevam@....com>
> 
> Since this fixes a kernel freeze, is there a chance to get this still in
> 4.9?

Since we get one more week to the final 4.9, is it possible for you to
send this fix for 4.9 inclusion?  Thanks.

For the patch,

Acked-by: Shawn Guo <shawnguo@...nel.org>

Shawn