linux-kernel - Re: [PATCH] clk: rockchip: Fix video codec clocks on rk3288

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Date:   Sat, 30 Mar 2019 11:35:06 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:     Heiko Stuebner <heiko@...ech.de>, Tomasz Figa <tfiga@...omium.org>,
        Ziyuan Xu <xzy.xu@...k-chips.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Ryan Case <ryandcase@...omium.org>,
        Elaine Zhang <zhangqing@...k-chips.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clk: rockchip: Fix video codec clocks on rk3288

Hi,

On Sat, Mar 30, 2019 at 7:25 AM Ezequiel Garcia
<ezequiel@...guardiasur.com.ar> wrote:
>
> On Fri, 29 Mar 2019 at 20:28, Ezequiel Garcia
> <ezequiel@...guardiasur.com.ar> wrote:
> >
> > On Fri, 29 Mar 2019 at 18:55, Douglas Anderson <dianders@...omium.org> wrote:
> > >
> > > It appears that there is a typo in the rk3288 TRM.  For
> > > GRF_SOC_CON0[7] it says that 0 means "vepu" and 1 means "vdpu".  It's
> > > the other way around.
> > >
> > > How do I know?  Here's my evidence:
> > >
> > > 1. Prior to commit 4d3e84f99628 ("clk: rockchip: describe aclk_vcodec
> > >    using the new muxgrf type on rk3288") we always pretended that we
> > >    were using "aclk_vdpu" and the comment in the code said that this
> > >    matched the default setting in the system.  In fact the default
> > >    setting is 0 according to the TRM and according to reading memory
> > >    at bootup.  In addition rk3288-based Chromebooks ran like this and
> > >    the video codecs worked.
> > > 2. With the existing clock code if you boot up and try to enable the
> > >    new VIDEO_ROCKCHIP_VPU as a module (and without "clk_ignore_unused"
> > >    on the command line), you get errors like "failed to get ack on
> > >    domain 'pd_video', val=0x80208".  After flipping vepu/vdpu things
> > >    init OK.
> > > 3. If I export and add both the vepu and vdpu to the list of clocks
> > >    for RK3288_PD_VIDEO I can get past the power domain errors, but now
> > >    I freeze when the vpu_mmu gets initted.
> > > 4. If I just mark the "vdpu" as IGNORE_UNUSED then everything boots up
> > >    and probes OK showing that somehow the "vdpu" was important to keep
> > >    enabled.  This is because we were actually using it as a parent.
> > > 5. After this change I can hack "aclk_vcodec_pre" to parent from
> > >    "aclk_vepu" using assigned-clocks and the video codec still probes
> > >    OK.
> > >
> > > Fixes: 4d3e84f99628 ("clk: rockchip: describe aclk_vcodec using the new muxgrf type on rk3288")
> > > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > > ---
> > > I currently have no way to test the JPEG mem2mem driver, so hopefully
> > > others can test this and make sure it's happy for them.  I'm just
> > > happy not to get strange errors at boot anymore.
> > >
> >
> > I won't have access to this hardware for a few days, but I am happy
> > to provide a simple test tool.
> >
> > Still haven't reviewed this, but thanks for chasing it down!
> >
>
> Here's a simple tool that tests JPEG encoding. There are two branches,
> with request API and without request API:
>
> https://gitlab.collabora.com/ezequiel/v4l-jpeg
>
> Usage is fairly simple, there's a test.sh that runs three tests,
> writing three JPEG images.

Didn't work for me.  I got:

unable to allocate media request 25

===

OK, after a bunch of debugging, I realized that I needed your series
from <https://patchwork.kernel.org/cover/10838323/>.  I applied that
together with my patch to the to of Heiko's current for-next tree and
I see:

destination plane sizeimage 76800 bytes
source plane 0 sizeimage 76800 bytes
source plane 1 sizeimage 19200 bytes
source plane 2 sizeimage 19200 bytes
src plane 0 mapped 76800 bytes
src plane 1 mapped 19200 bytes
src plane 2 mapped 19200 bytes
capture buffer size: 76800
capture bytes: 6385
bars-i420-320_240.jpeg written, 6385 bytes
destination plane sizeimage 76800 bytes
source plane 0 sizeimage 76800 bytes
source plane 1 sizeimage 38400 bytes
src plane 0 mapped 76800 bytes
src plane 1 mapped 38400 bytes
capture buffer size: 76800
capture bytes: 6385
bars-nv12-320_240.jpeg written, 6385 bytes
destination plane sizeimage 76800 bytes
source plane 0 sizeimage 153600 bytes
src plane 0 mapped 153600 bytes
capture buffer size: 76800
capture bytes: 6385
bars-yuy2-320_240.jpeg written, 6385 bytes


-Doug