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Message-ID: <66a6c513-7277-255d-dd56-eed1d6a8efe8@gmx.net>
Date:   Wed, 13 Sep 2023 13:31:15 +0200
From:   Stefan Wahren <wahrenst@....net>
To:     Umang Jain <umang.jain@...asonboard.com>,
        Robin Murphy <robin.murphy@....com>
Cc:     gregkh@...uxfoundation.org, f.fainelli@...il.com,
        athierry@...hat.com, error27@...il.com,
        kieran.bingham@...asonboard.com, laurent.pinchart@...asonboard.com,
        dave.stevenson@...pberrypi.com, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v10 1/5] staging: vc04_services: vchiq_arm: Add new bus
 type and device type

Hi Umang,

Am 12.09.23 um 09:23 schrieb Stefan Wahren:
> Hi Umang,
>
> Am 12.09.23 um 07:50 schrieb Umang Jain:
>> Hi Stephan
>>
>> On 9/12/23 1:52 AM, Stefan Wahren wrote:
>>> Hi Umang,
>>>
>>> Am 11.09.23 um 16:07 schrieb Umang Jain:
>>>> ...
>>>
>>> Unfortunately the call of of_dma_configure() generates warnings likes
>>> this (Raspberry Pi 3A+ with multi_v7_defconfig + VCHIQ):
>>>
>>> [    9.206802] vchiq-bus bcm2835-audio: DMA mask not set
>>> [    9.206892] vchiq-bus bcm2835-camera: DMA mask not set
>>
>> huh, really weird, as on my RPi-3-b I get these set correctly and I
>> don't any such warning.
> This warning comes from this line [1]. Did you test with the mainline
> devicetree from [2] which must be specified in the config.txt? Be
> aware the arm dts files has moved into a sub directory just like
> arm64. I don't use U-Boot, just the vendor bootloader from Raspberry
> Pi OS. Please look at [3] for the details.
please look at [4], which is possible a solution. AFAIK the dwc2 also
had the same problem.

[4] -
https://elixir.bootlin.com/linux/latest/source/drivers/usb/dwc2/platform.c#L448

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