linux-kernel - Re: [PATCH 00/12] Add support for BCM2712 DMA engine

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Date: Mon, 5 Feb 2024 20:06:25 +0100
From: Stefan Wahren <wahrenst@....net>
To: Andrea della Porta <andrea.porta@...e.com>, Vinod Koul
 <vkoul@...nel.org>, Florian Fainelli <florian.fainelli@...adcom.com>,
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, dmaengine@...r.kernel.org,
 linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Cc: Maxime Ripard <maxime@...no.tech>, Dom Cobley <popcornmix@...il.com>,
 Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH 00/12] Add support for BCM2712 DMA engine

Hi Andrea,

Am 04.02.24 um 07:59 schrieb Andrea della Porta:
> This patchset aims to update the dma engine for BCM* chipset with respect
> to current advancements in downstream vendor tree. In particular:
>
> * Added support for BCM2712 DMA.
> * Extended DMA addressing to 40 bit. Since BCM2711 also supports 40 bit addressing,
> it will also benefit from the update.
> * Handled the devicetree node from vendor dts (e.g. "dma40").
>
> The only difference between the application of this patch and the relative code
> in vendor tree is the dropping of channel reservation for BCM2708 DMA legacy
> driver, that seems to have not made its way to upstream anyway, and it's
> probably used only from deprecated subsystems.
>
> Compile tested and runtime tested on RPi4B only.
sorry but this is not sufficient. AFAIK only the Raspberry Pi 5 has a
BCM2712. I suggest to start with BCM2711 40 bit support, which is enough
work.

This whole series does neither contain a change to the dt-bindings nor
to the DTS files. This is not how it works.

Best regards
>
> Dom Cobley (4):
>    bcm2835-dma: Support dma flags for multi-beat burst
>    bcm2835-dma: Need to keep PROT bits set in CS on 40bit controller
>    dmaengine: bcm2835: Rename to_bcm2711_cbaddr to to_40bit_cbaddr
>    bcm2835-dma: Fixes for dma_abort
>
> Maxime Ripard (2):
>    dmaengine: bcm2835: Use to_bcm2711_cbaddr where relevant
>    dmaengine: bcm2835: Support DMA-Lite channels
>
> Phil Elwell (6):
>    bcm2835-dma: Add support for per-channel flags
>    bcm2835-dma: Add proper 40-bit DMA support
>    bcm2835-dma: Add NO_WAIT_RESP, DMA_WIDE_SOURCE and DMA_WIDE_DEST flag
>    bcm2835-dma: Advertise the full DMA range
>    bcm2835-dma: Derive slave DMA addresses correctly
>    dmaengine: bcm2835: Add BCM2712 support
>
>   drivers/dma/bcm2835-dma.c | 701 ++++++++++++++++++++++++++++++++------
>   1 file changed, 588 insertions(+), 113 deletions(-)
>