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Date:   Sat, 8 Sep 2018 19:00:34 +0200 (CEST)
From:   Stefan Wahren <stefan.wahren@i2se.com>
To:     Takashi Iwai <tiwai@suse.de>
Cc:     Eric Anholt <eric@anholt.net>,
        linux-rpi-kernel@lists.infradead.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
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 <2050605805.39126.1536412690563@email.1und1.de>
 <s5hd0to5598.wl-tiwai@suse.de>
Subject: Re: [PATCH 00/29] staging: bcm2835-audio: Cleanups and fixes
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Hi,

> Takashi Iwai <tiwai@suse.de> hat am 8. September 2018 um 18:21 geschrieben:
> 
> 
> On Sat, 08 Sep 2018 15:18:10 +0200,
> Stefan Wahren wrote:
> > 
> > Hi Takashi,
> > 
> > > Takashi Iwai <tiwai@suse.de> hat am 4. September 2018 um 17:58 geschrieben:
> > > 
> > > 
> > > Hi,
> > > 
> > > since I had an opportunity to play with RPi3B+ recently, I took a look
> > > at the existing bcm2835-audio driver code and was amused very much :)
> > > 
> > > So here is the result, a cleanup and fix patch series.
> > > 
> > > Most of the patches are trivial cleanups, just brushing up, removing
> > > many redundant and buggy codes, as well as code simplifications.
> > > 
> > > A big functional change is that now it uses non-atomic PCM ops, so
> > > that we can kill the ugly workqueue usages.  Also, the resource
> > > management was simplified.
> > 
> > first of all, thank you very much for this series.
> > 
> > Eric has no time as maintainer, so i will try to give you some feedback (beware of very little audio driver knowledge).
> > 
> > I functionally tested your patch series on a Raspberry Pi 1 B (bcm2835_defconfig), so this whole series is at least:
> > 
> > Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
> 
> OK, thanks, I'll put to my series in case of resubmission.
> Meanwhile I'll keep the series in topic/vc04 branch of sound.git
> tree.

does it mean this series should go through your tree instead of Greg's?

> 
> > Unfortunately there is still an corruption issue with underlying vchiq and multi_v7_defconfig, so no wider tests.
> 
> What is this corruption issue?

Actual there are two of them.

First one are incompatibilities of older VC4 firmware with commit 14dd37fc7b65 ("staging: vc04_services: Remove cache-line-size property (v3)"). There is a pull request for the Foundation kernel which hasn't been upstreamed yet [1].

The second is documented here [2].

[1] - https://github.com/raspberrypi/linux/pull/2666
[2] - https://github.com/lategoodbye/rpi-zero/issues/23

> 
> > I don't know if you tested this series on a Raspberry Pi. Maybe you have some specific scenarios, which should be tested.
> 
> I have only a RPi3B+, and that's all what I've tested.

Great, just of curiosity which config did you use?

> It'd be great if the patch series could be tested in a wider range of
> models, of course.
> 
> The patches are only about cleanups.  They corrected the bad usages of
> audio APIs and its design, but basically I haven't touched the basic
> functionality intentionally at all.  So the behavior should be kept as
> before.
> 
> (Actually it'd be better to revisit the design later, especially about
> the multi-cards option and the PCM route mixer control, but I left as
> is for compatibility reason for now.)
> 
> > As a reviewer i have some suggestions, but only trivia. I don't know if it's a problem that this series hasn't been send to devel@driverdev.osuosl.org
> 
> No, it's just because that address isn't found in MAINTAINERS file.
> If it should go through it, please correct the entry at first :)

No, this is the mailing list for all staging driver. It is reported by get_maintainers.pl

Stefan

> 
> 
> Thanks!
> 
> Takashi