linux-kernel - Re: [PATCH v8 02/18] soc: ti: k3: add navss ringacc driver

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Date:   Wed, 15 Jan 2020 11:44:28 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <santosh.shilimkar@...cle.com>, Sekhar Nori <nsekhar@...com>,
        <vkoul@...nel.org>, <robh+dt@...nel.org>, <nm@...com>,
        <ssantosh@...nel.org>
CC:     <dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <grygorii.strashko@...com>, <lokeshvutla@...com>,
        <t-kristo@...com>, <tony@...mide.com>, <j-keerthy@...com>,
        <vigneshr@...com>, <frowand.list@...il.com>
Subject: Re: [PATCH v8 02/18] soc: ti: k3: add navss ringacc driver



On 14/01/2020 20.06, santosh.shilimkar@...cle.com wrote:
>>>>> Can you please giver your Acked-by for the ringacc patches if they are
>>>>> still OK from your point of view as you had offered to take them
>>>>> before
>>>>> I got comments from Lokesh.
>>>>>
>>>> Sure. But you really need to split the series so that dma engine and
>>>> soc driver patches can be applied independently.
>>>
>>> The ringacc is a build and runtime dependency for the DMA. I have hoped
>>> that all of them can go via DMAengine (hence asking for your ACK on the
>>> drivers/soc/ti/ patches) for 5.6.
>>>
>>>> Can you please do that?
>>>
>>> This late in the merge window that would really mean that I will miss
>>> another release for the KS3 DMA...
>>> I can live with that if you can pick the ringacc for 5.6 and if Vinod
>>> takes the DMAengine core changes as well.
>>>
>>> That would leave only the DMA drivers for 5.7 and we can also queue up
>>> changes for 5.7 which depends on the DMAengine API (ASoC changes, UART,
>>> sa2ul, etc).
>>>
>>> If they go independently and nothing makes it to 5.6 then 5.8 is the
>>> realistic target for the DMA support for the KS3 family of devices...
>>
>> Thats too many kernel versions to get this important piece in.
>>
>> Santosh, if you do not have anything else queued up that clashes with
>> this, can the whole series be picked up by Vinod with your ack on the
>> drivers/soc/ti/ pieces?
>>
> I would prefer driver patches to go via driver tree.

Not sure what you mean by 'driver patches'...
The series to enable DMA support on TI's K3 platform consists:
Patch 1-2: Ring Accelerator _driver_ (drivers/soc/ti/)
Patch 3-6: DMAengine core patches to add new features needed for k3-udma
Patch 7-11: DMA _driver_ patches for K3 (drivers/dma/ti/)

Patch 10 depends on the ringacc and the DMAengine core patches
Patch 11 depends on patch 10

I kept it as a single series in hope that they will go via one subsystem
tree to avoid build dependency issues and will have a good amount of
time in linux-next for testing.

>> Vinod could also perhaps setup an immutable branch based on v5.5-rc1
>> with just the drivers/soc/ti parts applied so you can merge that branch
>> in case you end up having to send up anything that conflicts.
>>
> As suggested on other email to Peter, these DMA engine related patches
> should be queued up since they don't have any dependency. Based on
> the status of that patchset, will take care of pulling in the driver
> patches either for this merge window or early part of next merge window.

OK, I'll send the two patch for ringacc as a separate series.

Vinod: Would it be possible for you to pick up the DMAengine core
patches (patch 3-6)?
The UDMA driver patches have hard dependency on DMAengine core and
ringacc, not sure how they are going to go in...

> Regards,
> Santosh

- Péter

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