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

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Date:   Wed, 10 Apr 2019 08:45:45 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Heiko Stuebner <heiko@...ech.de>,
        Elaine Zhang <zhangqing@...k-chips.com>
Cc:     Tomasz Figa <tfiga@...omium.org>,
        Ziyuan Xu <xzy.xu@...k-chips.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Ryan Case <ryandcase@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clk: rockchip: Fix video codec clocks on rk3288

Hi,

On Fri, Mar 29, 2019 at 2:55 PM 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.
>
>  drivers/clk/rockchip/clk-rk3288.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Any thoughts about this patch?  I'm 99.9% certain it's correct and
it'd be nice to get it landed.  Heiko: I assume you're still
collecting Rockchip clock patches and would be the one to apply it and
(at some point) send a pull request to the clock tree?

-Doug