linux-kernel - Re: FW: [PATCH v20 2/4] mailbox: mediatek: Add Mediatek CMDQ driver

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Date:   Thu, 18 Jan 2018 16:31:53 +0800
From:   houlong wei <houlong.wei@...iatek.com>
To:     Jassi Brar <jassisinghbrar@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        "Sascha Hauer" <s.hauer@...gutronix.de>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Nicolas Boichat <drinkcat@...omium.org>,
        CK Hu (胡俊光) 
        <ck.hu@...iatek.com>,
        "Cawa Cheng (鄭曄禧)" 
        <cawa.cheng@...iatek.com>,
        Bibby Hsieh (謝濟遠) 
        <Bibby.Hsieh@...iatek.com>,
        YT Shen (沈岳霆) 
        <Yt.Shen@...iatek.com>,
        Daoyuan Huang (黃道原) 
        <Daoyuan.Huang@...iatek.com>,
        Damon Chu (朱峻賢) 
        <Damon.Chu@...iatek.com>,
        Josh-YC Liu (劉育誠) 
        <Josh-YC.Liu@...iatek.com>,
        Glory Hung (洪智瑋) 
        <glory.hung@...iatek.com>,
        Jiaguang Zhang (张加广) 
        <Jiaguang.Zhang@...iatek.com>,
        Dennis-YC Hsieh (謝宇哲) 
        <Dennis-YC.Hsieh@...iatek.com>,
        Monica Wang (王孟婷) 
        <monica.wang@...iatek.com>,
        Hs Liao (廖宏祥) 
        <Hs.Liao@...iatek.com>, <houlong.wei@...iatek.com>
Subject: Re: FW: [PATCH v20 2/4] mailbox: mediatek: Add Mediatek CMDQ driver

Hi Jassi,

There is one request for one GCE h/w buffer which contains a list of
registers operation.
I will resubmit a version and please review again.

Thanks,
Houlong

On Thu, 2018-01-18 at 16:01 +0800, Jassi Brar wrote:
> On Mon, Jan 8, 2018 at 2:08 PM, houlong wei <houlong.wei@...iatek.com> wrote:
> > Hi Jassi,
> >
> > Sorry for reply so late.
> > According to previous discussion, there are two methods to move
> > dma_map_single() outside of spin_lock.
> > (1) put in mtk-cmdq-helper.c, as described by HS on 2017-02-09.
> >   > I think a trade-off solution is to put in mtk-cmdq-helper.c.
> >   > Although it is a mailbox client, it is not a CMDQ client.
> >   > We can include mailbox_controller.h in mtk-cmdq-helper.c (instead of
> > mtk-cmdq.h), and then map dma at cmdq_pkt_flush_async before
> > mbox_send_message.
> >
> >   > pkt->pa_base = dma_map_single(client->chan->mbox->dev, pkt->va_base,
> >   >                              pkt->cmd_buf_size, DMA_TO_DEVICE);
> > (2) schedule a tasklet in send_data().
> >
> > After internal discussion with HS and other experts, now we prefer
> > method (1).
> > How do you think about it?
> >
> I don't exactly see how you mean but please remember send_data()
> callback is supposed to be atomic ... it is protected by
> spin_lock_irqsave/restore in drivers/mailbox/mailbox.c:msg_submit()
> 
> BTW, how many requests max can be queued in the GCE h/w buffer?
> And since it's been over a year now, could you please resubmit after
> checking for checkpatch with the --strict option?
> 
> Thanks.