Re: [PATCH] ARM: dts: rockchip: Add DMA tx and rx channels in UART interfaces for RK3288 SoCs

["Heiko Stübner" <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>]

Hi Romain,

Am Dienstag, 23. Juni 2015, 08:53:17 schrieb Romain Perier:
> ping :)

I haven't forgotten this patch :-)

I just haven't fully made up my mind concerning the bug in the pl330 
implementation on Rockchip SoCs - aka if we'll make it worse by also enabling 
dma on the uarts.

So far the problem reports I read only mentioned degraded functionality like 
popping sounds in audio, not full system failures or freezes. So I tend to 
include the patch and see what happens ;-)


Heiko



> 2015-06-16 19:19 GMT+02:00 Romain Perier <romain.perier-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> > This enable DMA capability for the corresponding UART interfaces, also it
> > removes warning "ttyS%d - Failed to request dma" from kernel logs.
> > 
> > Signed-off-by: Romain Perier <romain.perier-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > ---
> > 
> > Changes since v1 ("[PATCH] ARM: dts: rockchip: Add dmac_bus rx and tx for 
uart2"):
> >         - Add DMA tx and rx channels for all UART interfaces
> >         - Rename commit summary
> >  
> >  arch/arm/boot/dts/rk3288.dtsi | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> > index 22316d0..1996452 100644
> > --- a/arch/arm/boot/dts/rk3288.dtsi
> > +++ b/arch/arm/boot/dts/rk3288.dtsi
> > @@ -359,6 +359,8 @@
> > 
> >                 clock-names = "baudclk", "apb_pclk";
> >                 pinctrl-names = "default";
> >                 pinctrl-0 = <&uart0_xfer>;
> > 
> > +               dmas = <&dmac_peri 1>, <&dmac_peri 2>;
> > +               dma-names = "tx", "rx";
> > 
> >                 status = "disabled";
> >         
> >         };
> > 
> > @@ -372,6 +374,8 @@
> > 
> >                 clock-names = "baudclk", "apb_pclk";
> >                 pinctrl-names = "default";
> >                 pinctrl-0 = <&uart1_xfer>;
> > 
> > +               dmas = <&dmac_peri 3>, <&dmac_peri 4>;
> > +               dma-names = "tx", "rx";
> > 
> >                 status = "disabled";
> >         
> >         };
> > 
> > @@ -385,6 +389,8 @@
> > 
> >                 clock-names = "baudclk", "apb_pclk";
> >                 pinctrl-names = "default";
> >                 pinctrl-0 = <&uart2_xfer>;
> > 
> > +               dmas = <&dmac_bus_s 4>, <&dmac_bus_s 5>;
> > +               dma-names = "tx", "rx";
> > 
> >                 status = "disabled";
> >         
> >         };
> > 
> > @@ -398,6 +404,8 @@
> > 
> >                 clock-names = "baudclk", "apb_pclk";
> >                 pinctrl-names = "default";
> >                 pinctrl-0 = <&uart3_xfer>;
> > 
> > +               dmas = <&dmac_peri 7>, <&dmac_peri 8>;
> > +               dma-names = "tx", "rx";
> > 
> >                 status = "disabled";
> >         
> >         };
> > 
> > @@ -411,6 +419,8 @@
> > 
> >                 clock-names = "baudclk", "apb_pclk";
> >                 pinctrl-names = "default";
> >                 pinctrl-0 = <&uart4_xfer>;
> > 
> > +               dmas = <&dmac_peri 9>, <&dmac_peri 10>;
> > +               dma-names = "tx", "rx";
> > 
> >                 status = "disabled";
> >         
> >         };
> > 
> > --
> > 1.9.1

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