linux-kernel - Re: [PATCH v3 1/9] ARM: dts: imx6qdl: Specify IMX6QDL_CLK_IPG as "ipg" clock to SDMA

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Date:   Sat, 20 Apr 2019 07:14:26 -0500
From:   Adam Ford <aford173@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Angus Ainslie <angus@...ea.ca>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chris Healy <cphealy@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH v3 1/9] ARM: dts: imx6qdl: Specify IMX6QDL_CLK_IPG as
 "ipg" clock to SDMA

On Wed, Apr 10, 2019 at 9:30 PM Shawn Guo <shawnguo@...nel.org> wrote:
>
> On Thu, Mar 28, 2019 at 11:49:16PM -0700, Andrey Smirnov wrote:
> > Since 25aaa75df1e6 SDMA driver uses clock rates of "ipg" and "ahb"
> > clock to determine if it needs to configure the IP block as operating
> > at 1:1 or 1:2 clock ratio (ACR bit in SDMAARM_CONFIG). Specifying both
> > clocks as IMX6QDL_CLK_SDMA results in driver incorrectly thinking that
> > ratio is 1:1 which results in broken SDMA funtionality(this at least
> > breaks RAVE SP serdev driver on RDU2). Fix the code to specify
> > IMX6QDL_CLK_IPG as "ipg" clock for SDMA, to avoid detecting incorrect
> > clock ratio.
> >
> > Fixes: 25aaa75df1e6 ("dmaengine: imx-sdma: add clock ratio 1:1 check")
>
> Since we have a fix in the dma driver, I dropped the Fixes tag here.
>
> Applied all, thanks.

Do you know if the SDMA fixes will be back-ported to 5.0.y branch?  To
get 5.0 working, I need to manually apply the patches.

thanks

adam
>
> Shawn
>
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> > Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Angus Ainslie (Purism) <angus@...ea.ca>
> > Cc: Chris Healy <cphealy@...il.com>
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Fabio Estevam <fabio.estevam@....com>
> > Cc: Shawn Guo <shawnguo@...nel.org>
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  arch/arm/boot/dts/imx6qdl.dtsi | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
> > index 9f9aa6e7ed0e..354feba077b2 100644
> > --- a/arch/arm/boot/dts/imx6qdl.dtsi
> > +++ b/arch/arm/boot/dts/imx6qdl.dtsi
> > @@ -949,7 +949,7 @@
> >                               compatible = "fsl,imx6q-sdma", "fsl,imx35-sdma";
> >                               reg = <0x020ec000 0x4000>;
> >                               interrupts = <0 2 IRQ_TYPE_LEVEL_HIGH>;
> > -                             clocks = <&clks IMX6QDL_CLK_SDMA>,
> > +                             clocks = <&clks IMX6QDL_CLK_IPG>,
> >                                        <&clks IMX6QDL_CLK_SDMA>;
> >                               clock-names = "ipg", "ahb";
> >                               #dma-cells = <3>;
> > --
> > 2.20.1
> >
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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