linux-kernel - Re: [PATCH v6 05/17] media: rkisp1: add Rockchip ISP1 subdev driver

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Date:   Thu, 24 May 2018 14:30:12 +0300
From:   Baruch Siach <baruch@...s.co.il>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Jacob Chen <jacob-chen@...wrt.com>,
        ARM/Rockchip SoC <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        IOMMU DRIVERS <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        钟以崇 <zyc@...k-chips.com>,
        Eddie Cai <eddie.cai.linux@...il.com>,
        Jeffy <jeffy.chen@...k-chips.com>, devicetree@...r.kernel.org,
        Heiko Stübner <heiko@...ech.de>,
        陈城 <cc@...k-chips.com>,
        Allon Huang <allon.huang@...k-chips.com>
Subject: Re: [PATCH v6 05/17] media: rkisp1: add Rockchip ISP1 subdev driver

Hi Tomasz,

On Mon, May 07, 2018 at 06:41:50AM +0000, Tomasz Figa wrote:
> On Mon, May 7, 2018 at 3:38 PM Baruch Siach <baruch@...s.co.il> wrote:
> > On Mon, May 07, 2018 at 06:13:27AM +0000, Tomasz Figa wrote:
> > > On Thu, May 3, 2018 at 6:09 PM Baruch Siach <baruch@...s.co.il> wrote:
> > > > On Thu, Mar 08, 2018 at 05:47:55PM +0800, Jacob Chen wrote:
> > > > > +static int rkisp1_isp_sd_s_power(struct v4l2_subdev *sd, int on)
> > > > > +{
> > > > > +     struct rkisp1_device *isp_dev = sd_to_isp_dev(sd);
> > > > > +     int ret;
> > > > > +
> > > > > +     v4l2_dbg(1, rkisp1_debug, &isp_dev->v4l2_dev, "s_power: %d\n",
> > > on);
> > > > > +
> > > > > +     if (on) {
> > > > > +             ret = pm_runtime_get_sync(isp_dev->dev);
> > > > > +             if (ret < 0)
> > > > > +                     return ret;
> > > > > +
> > > > > +             rkisp1_config_clk(isp_dev);
> > > > > +     } else {
> > > > > +             ret = pm_runtime_put(isp_dev->dev);
> > >
> > > > I commented this line out to make more than one STREAMON work.
> Otherwise,
> > > > the second STREAMON hangs. I guess the bug is not this driver.
> Probably
> > > > something in drivers/soc/rockchip/pm_domains.c. Just noting that in
> case
> > > > you or someone on Cc would like to investigate it further.
> > > >
> > > > I tested v4.16-rc4 on the Tinkerboard.
> > >
> > > Looks like that version doesn't include the IOMMU PM and clock handling
> > > rework [1], which should fix a lot of runtime PM issues. FWIW,
> linux-next
> > > seems to already include it.
> > >
> > > [1] https://lkml.org/lkml/2018/3/23/44
> 
> > Thanks for the reference.
> 
> > It looks like the iommu driver part is in Linus' tree already. The DT
> part is
> > in the v4.18-armsoc/dts32 branch of Heiko's tree. Am I missing anything?
> 
> You're right, most of the series made it in time for 4.17. However, the DT
> part (precisely, the clocks properties added to IOMMU nodes) is crucial for
> the fixes to be effective.
> 
> > Anyway, I'll take a look.
> 
> Thanks for testing. :) (Forgot to mention in my previous email...)

I finally got around to testing. Unfortunately, kernel v4.17-rc6 with 
cherry-pick of commit c78751f91c0b (ARM: dts: rockchip: add clocks in iommu 
nodes) from Heiko's tree still exhibit the same problem. STREAMON hangs on 
second try. The same workaround "fixes" it.

baruch

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