linux-kernel - Re: [PATCH v2] arm64: dts: qcom: Remove duplicate sc7180-trogdor include on lazor/homestar

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Message-ID: <CAD=FV=X6702aSaEnpXUhF40b0kZuz1QvOBLNg-xcNDYbVCbsDw@mail.gmail.com>
Date:   Thu, 2 Jun 2022 13:08:14 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>, patches@...ts.linux.dev,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "Joseph S. Barrera III" <joebar@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: Remove duplicate sc7180-trogdor
 include on lazor/homestar

Hi,

On Thu, Jun 2, 2022 at 12:06 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> The sc7180-trogdor-{lazor,homestar}-*.dtsi files all include
> sc7180-trogdor.dtsi and sc7180-trogdor-lazor.dtsi or
> sc7180-trogdor-homestar.dtsi, so including it here in the
> sc7180-trogdor-{lazor,homestar}.dtsi file means we have a duplicate
> include after commit 19794489fa24 ("arm64: dts: qcom: Only include
> sc7180.dtsi in sc7180-trogdor.dtsi"). We include the sc7180-trogdor.dtsi
> file in a board like sc7180-trogdor-lazor-r1.dts so that we can include
> the display bridge snippet (e.g. sc7180-trogdor-ti-sn65dsi86.dtsi)
> instead of making ever increasing variants like
> sc7180-trogdor-lazor-ti-sn65dsi86.dtsi.
>
> Unfortunately, having the double include like this means the display
> bridge's i2c bus is left disabled instead of enabled by the bridge
> snippet. Any boards that use the i2c bus for the display bridge will
> have the bus disabled when we include sc7180-trogdor.dtsi the second
> time, which picks up the i2c status="disabled" line from sc7180.dtsi.
> This leads to the display not turning on and black screens at boot on
> lazor and homestar devices.
>
> Fix this by dropping the include and making a note that the
> sc7180-trogdor-{lazor,homestar}.dtsi file must be included after
> sc7180-trogdor.dtsi
>
> Reported-by: Douglas Anderson <dianders@...omium.org>
> Cc: "Joseph S. Barrera III" <joebar@...omium.org>
> Cc: Matthias Kaehlcke <mka@...omium.org>
> Fixes: 19794489fa24 ("arm64: dts: qcom: Only include sc7180.dtsi in sc7180-trogdor.dtsi")
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>
> It would be great to get this into -rc1 if possible to fix broken
> display.

Reviewed-by: Douglas Anderson <dianders@...omium.org>

I tested and this fixes the "no display" problem on Linus's tree on
both homestar and lazor.

Tested-by: Douglas Anderson <dianders@...omium.org>