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From:   Stephen Boyd <swboyd@chromium.org>
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Date:   Mon, 1 Nov 2021 11:10:21 -0700
Message-ID: <CAE-0n529Nfp7rOA4a4dtvh83rPxjVQ2VK0uDORgzOWmSsDa6rA@mail.gmail.com>
Subject: Re: [PATCH] drm/msm/dsi: set default num_data_lanes
To:     LKML <linux-kernel@vger.kernel.org>,
        Philip Chen <philipchen@chromium.org>
Cc:     dianders@chromium.org, robdclark@chromium.org,
        Abhinav Kumar <abhinavk@codeaurora.org>,
        Bernard Zhao <bernard@vivo.com>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@linux.ie>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Jonathan Marek <jonathan@marek.ca>,
        Nicolas Boichat <drinkcat@chromium.org>,
        Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Yangtao Li <tiny.windzz@gmail.com>,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
        linux-arm-msm@vger.kernel.org
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Quoting Philip Chen (2021-10-30 10:08:50)
> If "data_lanes" property of the dsi output endpoint is missing in
> the DT, num_data_lanes would be 0 by default, which could cause
> dsi_host_attach() to fail if dsi->lanes is set to a non-zero value
> by the bridge driver.
>
> According to the binding document of msm dsi controller, the
> input/output endpoint of the controller is expected to have 4 lanes.
> So let's set num_data_lanes to 4 by default.
>
> Signed-off-by: Philip Chen <philipchen@chromium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>