linux-kernel - Re: [PATCH 00/14] staging: vc04

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Message-ID: <a56d7687-ee44-629c-1a9d-fa34e65e847f@ideasonboard.com>
Date:   Sat, 26 Nov 2022 21:56:12 +0530
From:   Umang Jain <umang.jain@...asonboard.com>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        linux-media@...r.kernel.org, kernel-list@...pberrypi.com,
        linux-kernel@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>
Cc:     Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Naushir Patuck <naush@...pberrypi.com>,
        David Plowman <david.plowman@...pberrypi.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH 00/14] staging: vc04_services: bcm2835-isp support

Hi Stefan

On 11/26/22 8:12 PM, Stefan Wahren wrote:
> Hi Umang,
>
> Am 21.11.22 um 22:47 schrieb Umang Jain:
>> This series aims to upport bcm2835-isp from the RPi kernel [1] and is a
>> independent subset of earlier series [2] posted to upport CSI-2/CCP2
>> receiver IP core("Unicam) + the ISP driver found in BCM283x and 
>> compatible
>> SoCs (namely BCM2711). Unicam is still under active development to work
>> with multistream support to get into mainline. Hence only the ISP driver
>> will remain the primary area of this series.
>
> thanks for working on this. But honestly i would prefer that vchiq 
> comes out of staging before adding more features. As Greg said some 
> time ago staging is not a place to "dump code and run away". These new 
> files are in the same bad shape as the rest of vc04 before the 
> clean-up here in staging started.

Certainly, I am not here to do that - but I am still learning the ropes.

If the staging issue is becoming a blocker for bcm2835-isp going 
upstream, I would be happy to help here! Though I must mention that I 
still have limited visibility so my aim would be to chart out a plan of 
things needed to be done to get vc04_services out of staging!

>
> I agree that VCSM is on the TODO list for vchiq, but this driver is 
> not necessary for making bcm2835-audio & bcm2835-camera leave staging. 
> It just binds more resources on a new feature.

I see two TODO files in vc04_services:
     ./bcm2835-camera/TODO
     ./interface/TODO

One of the bcm2835-camera TODO points to the vc-sm-cma driver itself. So 
that's address in the series. The other remaining one - I will need to 
take a deeper look before commenting on it.

The main chunk of TODO are in vc04_services/interfaces/TODO.  Doing a 
cursory reading of them suggests that these apply to *all* vc04_services 
components? Am I right?

Are these are the specific bits of cleanup you are referring to in your 
comment?


>
> Unfortuntately i hadn't much time to work on vchiq by myself.
>
> Just my two cents
> Stefan
>