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

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Date:   Wed, 10 Apr 2019 18:38:52 +0000
From:   Jonas Karlman <jonas@...boo.se>
To:     Doug Anderson <dianders@...omium.org>,
        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>,
        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

On 2019-04-10 17:45, Doug Anderson wrote:
> 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

This clk fix is needed to make MPEG-2 decoding work on my RK3288 Tinker Board using the
rockchip vpu patchset and a patch to add RK3288 specific MPEG-2 code [1].

Also note that the same change was suggested in a previous patch [2] from by ayaka.

If possible please also add the CLK_SET_RATE_PARENT change from [3] in a possible v2,
that fixes assigning the aclk_vcodec clk to 400Mhz in the rockchip vpu driver.

[1] https://github.com/Kwiboo/linux-rockchip/commit/1f78093e05c7360515a185f48b7c5cb8ba1e3e15
[2] https://patchwork.kernel.org/patch/9725553/
[3] https://github.com/Kwiboo/linux-rockchip/commit/9216da3f1521a0be5889235abe7fa093a4894160

Regards,
Jonas