linux-kernel - Re: [PATCH RFC 4/6] ARM: dts: msm8974: add display support

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Date:   Wed, 8 May 2019 22:16:16 -0400
From:   Brian Masney <masneyb@...tation.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     robdclark@...il.com, sean@...rly.run,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, airlied@...ux.ie, daniel@...ll.ch,
        linux-kernel@...r.kernel.org, linus.walleij@...aro.org
Subject: Re: [PATCH RFC 4/6] ARM: dts: msm8974: add display support

On Mon, May 06, 2019 at 11:39:02PM -0700, Bjorn Andersson wrote:
> On Sun 05 May 06:04 PDT 2019, Brian Masney wrote:
> > diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
> [..]
> > +				clocks = <&mmcc MDSS_MDP_CLK>,
> > +				         <&mmcc MDSS_AHB_CLK>,
> > +				         <&mmcc MDSS_AXI_CLK>,
> > +				         <&mmcc MDSS_BYTE0_CLK>,
> > +				         <&mmcc MDSS_PCLK0_CLK>,
> > +				         <&mmcc MDSS_ESC0_CLK>,
> > +				         <&mmcc MMSS_MISC_AHB_CLK>;
> > +				clock-names = "mdp_core",
> > +				              "iface",
> > +				              "bus",
> > +				              "byte",
> > +				              "pixel",
> > +				              "core",
> > +				              "core_mmss";
> 
> Unless I enable MMSS_MMSSNOC_AXI_CLK and MMSS_S0_AXI_CLK I get some
> underrun error from DSI. You don't see anything like this?
> 
> (These clocks are controlled by msm_bus downstream and should be driven
> by interconnect upstream)
> 
> 
> Apart from this, I think this looks nice. Happy to see the progress.

No, I'm not seeing an underrun errors from the DSI. I think the clocks
are fine since I'm able to get this working with 4.17 using these same
clocks. I just sent out v2 and the cover letter has some details, along
with the full dmesg.

Brian