linux-kernel - Re: [RESEND PATCH v7 1/1] firmware: mediatek: add adsp ipc protocol interface

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Date:   Fri, 6 May 2022 19:37:07 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sudeep Holla <sudeep.holla@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Borislav Petkov <bp@...e.de>,
        Michal Suchanek <msuchanek@...e.de>,
        "Cristian Marussi" <cristian.marussi@....com>,
        Etienne Carriere <etienne.carriere@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        "John Stultz" <john.stultz@...aro.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>,
        YC Hung <yc.hung@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...gle.com>,
        Curtis Malainey <cujomalainey@...omium.org>,
        Mark Brown <broonie@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <alsa-devel@...a-project.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [RESEND PATCH v7 1/1] firmware: mediatek: add adsp ipc protocol
 interface

Hi Greg,

Thanks for your review.

On Thu, 2022-05-05 at 23:10 +0200, Greg Kroah-Hartman wrote:
> On Thu, May 05, 2022 at 01:30:48PM +0800, Tinghan Shen wrote:
> > From: TingHan Shen <tinghan.shen@...iatek.com>
> > 
> > Some of mediatek processors contain
> > the Tensilica HiFix DSP for audio processing.
> > 
> > The communication between Host CPU and DSP firmware is
> > taking place using a shared memory area for message passing.
> > 
> > ADSP IPC protocol offers (send/recv) interfaces using
> > mediatek-mailbox APIs.
> > 
> > We use two mbox channels to implement a request-reply protocol.
> > 
> > Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
> > Signed-off-by: TingHan Shen <tinghan.shen@...iatek.com>
> > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> > Reviewed-by: Curtis Malainey <cujomalainey@...omium.org>
> > Reviewed-by: Tzung-Bi Shih <tzungbi@...gle.com>
> > Reviewed-by: YC Hung <yc.hung@...iatek.com>
> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> > ---
> >  drivers/firmware/Kconfig                      |   1 +
> >  drivers/firmware/Makefile                     |   1 +
> >  drivers/firmware/mediatek/Kconfig             |   9 +
> >  drivers/firmware/mediatek/Makefile            |   2 +
> >  drivers/firmware/mediatek/mtk-adsp-ipc.c      | 161 ++++++++++++++++++
> >  .../linux/firmware/mediatek/mtk-adsp-ipc.h    |  65 +++++++
> >  6 files changed, 239 insertions(+)
> >  create mode 100644 drivers/firmware/mediatek/Kconfig
> >  create mode 100644 drivers/firmware/mediatek/Makefile
> >  create mode 100644 drivers/firmware/mediatek/mtk-adsp-ipc.c
> >  create mode 100644 include/linux/firmware/mediatek/mtk-adsp-ipc.h
> 
> Why do you have a .h file, and export symbols in your .c file, yet you
> have no user of these symbols or header file?
> 
> Without a user, we can not take this, sorry.

MediaTek have adsp client drivers on 2 chips that use symbols from this module.
We were planned to upstream them after Linux community accept this module.
I will add those client drivers in next version.

> 
> This should just be one single .c file.
> 
> Also, why a whole subdirectory for just one .c file?

Ok, I'll move the souce out and remove this subdirectory in next version.
Thank you very much.

Best regards,
TingHan

> 
> thanks,
> 
> greg k-h