linux-kernel - Re: [PATCH v2 5/5] clk: qcom: add video clock controller driver for SM8250

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Message-ID: <160092826778.310579.12225989905897101118@swboyd.mtv.corp.google.com>
Date:   Wed, 23 Sep 2020 23:17:47 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Jonathan Marek <jonathan@...ek.ca>, linux-arm-msm@...r.kernel.org,
        Taniya Das <tdas@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 5/5] clk: qcom: add video clock controller driver for SM8250

Quoting Jonathan Marek (2020-09-23 17:54:59)
> On 9/23/20 7:30 PM, Stephen Boyd wrote:
> > Quoting Jonathan Marek (2020-09-23 09:07:16)
> >> On 9/22/20 2:46 PM, Stephen Boyd wrote:
> >>> Quoting Jonathan Marek (2020-09-03 20:09:54)
> >>>
> >>>> +                       .ops = &clk_branch2_ops,
> >>>> +               },
> >>>> +       },
> >>>> +};
> >>>> +
> >>>> +static struct clk_branch video_cc_mvs0_clk = {
> >>>> +       .halt_reg = 0xd34,
> >>>> +       .halt_check = BRANCH_HALT_SKIP, /* TODO: hw gated ? */
> >>>
> >>> Is this resolved?
> >>>
> >>
> >> Downstream has this clock as BRANCH_HALT_VOTED, but with the upstream
> >> venus driver (with patches to enable sm8250), that results in a
> >> "video_cc_mvs0_clk status stuck at 'off" error. AFAIK venus
> >> enables/disables this clock on its own (venus still works without
> >> touching this clock), but I didn't want to remove this in case it might
> >> be needed. I removed these clocks in the v3 I just sent.
> >>
> > 
> > Hmm. Does downstream use these clks? There have been some clk stuck
> > problems with venus recently that were attributed to improperly enabling
> > clks before enabling interconnects and power domains. Maybe it's the
> > same problem.
> > 
> 
> Yes, downstream uses these clks.
> 
> The "stuck" problem still happens if GSDCS/interconnects are always on, 
> and like I mentioned, venus works even with these clocks completely 
> removed.
> 
> I think venus controls these clocks (and downstream just happens to try 
> enabling it at a point where venus has already enabled it?). I'm not too 
> sure about this, it might have something to do with the GDSC having the 
> HW_CTRL flag too..

Ok. Maybe Taniya has an idea.