Re: [PATCH] ARM: dts: am33xx: fix DMA support for the second USB interface

George Cherian
2014-04-28T14:26:48Z

On 4/28/2014 2:07 PM, yegorslists@googlemail.com wrote:
> From: Yegor Yefremov <yegorslists@googlemail.com>
>
> This patch creates unique DMA channels for the second USB
> interface, otherwise the second USB interface is not usable
> at all.
MUSB_DMA_NUM_CHANNELS is 15, so if you pass any dma-names > 15 (>
rx15/tx15),
the dma_controller_create in musb_core.c fails and it falls back to PIO
mode.

>
> Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
> ---
> arch/arm/boot/dts/am33xx.dtsi | 12 ++++++------
> 1 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
> index 07f283c..e04cbbc 100644
> --- a/arch/arm/boot/dts/am33xx.dtsi
> +++ b/arch/arm/boot/dts/am33xx.dtsi
> @@ -548,12 +548,12 @@
> &cppi41dma 26 1 &cppi41dma 27 1
> &cppi41dma 28 1 &cppi41dma 29 1>;
> dma-names =
> - "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
> - "rx8", "rx9", "rx10", "rx11", "rx12", "rx13",
> - "rx14", "rx15",
> - "tx1", "tx2", "tx3", "tx4", "tx5", "tx6", "tx7",
> - "tx8", "tx9", "tx10", "tx11", "tx12", "tx13",
> - "tx14", "tx15";
> + "rx16", "rx17", "rx18", "rx19", "rx20", "rx21", "rx22",
> + "rx23", "rx24", "rx25", "rx26", "rx27", "rx28",
> + "rx29", "rx30",
> + "tx16", "tx17", "tx18", "tx19", "tx20", "tx21", "tx22",
> + "tx23", "tx24", "tx25", "tx26", "tx27", "tx28",
> + "tx29", "tx30";
> };
>
> cppi41dma: dma-controller@47402000 {

--
-George