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

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Date:   Fri, 29 Mar 2019 20:28:04 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, Tomasz Figa <tfiga@...omium.org>,
        Ziyuan Xu <xzy.xu@...k-chips.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        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@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clk: rockchip: Fix video codec clocks on rk3288

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!

EZe

>  drivers/clk/rockchip/clk-rk3288.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c
> index 5a67b7869960..4d767f9c3a80 100644
> --- a/drivers/clk/rockchip/clk-rk3288.c
> +++ b/drivers/clk/rockchip/clk-rk3288.c
> @@ -219,7 +219,7 @@ PNAME(mux_hsadcout_p)       = { "hsadc_src", "ext_hsadc" };
>  PNAME(mux_edp_24m_p)   = { "ext_edp_24m", "xin24m" };
>  PNAME(mux_tspout_p)    = { "cpll", "gpll", "npll", "xin27m" };
>
> -PNAME(mux_aclk_vcodec_pre_p)   = { "aclk_vepu", "aclk_vdpu" };
> +PNAME(mux_aclk_vcodec_pre_p)   = { "aclk_vdpu", "aclk_vepu" };
>  PNAME(mux_usbphy480m_p)                = { "sclk_otgphy1_480m", "sclk_otgphy2_480m",
>                                     "sclk_otgphy0_480m" };
>  PNAME(mux_hsicphy480m_p)       = { "cpll", "gpll", "usbphy480m_src" };
> --
> 2.21.0.392.gf8f6787159e-goog
>


-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar