linux-kernel - Re: [PATCH net-next 4/8] MIPS: lantiq: dma: make the burst length configurable by the drivers

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Date:   Wed, 15 Sep 2021 00:40:14 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     Aleksander Jan Bajkowski <olek2@...pl>, john@...ozen.org,
        tsbogend@...ha.franken.de, maz@...nel.org, ralf@...ux-mips.org,
        ralph.hempel@...tiq.com, davem@...emloft.net, kuba@...nel.org,
        robh+dt@...nel.org, dev@...sin.me, arnd@...db.de, jgg@...pe.ca,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 4/8] MIPS: lantiq: dma: make the burst length
 configurable by the drivers

On 9/14/21 11:21 PM, Aleksander Jan Bajkowski wrote:
> Make the burst length configurable by the drivers.
> 
> Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>

Acked-by: Hauke Mehrtens <hauke@...ke-m.de>
For all 4 "MIPS: lantiq: dma:" changes.

> ---
>   .../include/asm/mach-lantiq/xway/xway_dma.h   |  2 +-
>   arch/mips/lantiq/xway/dma.c                   | 38 ++++++++++++++++---
>   2 files changed, 34 insertions(+), 6 deletions(-)
> 

The DMA changes are looking good.

There is also a DMA API driver for this IP core now:
https://elixir.bootlin.com/linux/v5.15-rc1/source/drivers/dma/lgm/lgm-dma.c
I do not know if it works fully with these older MIPS SoCs.
Changing the drivers to use the standard DMA API is a bigger change, 
which could be done later.

Hauke