linux-kernel - Re: [PATCH v2] drm/mediatek: dp: Add phy_mtk

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Date:   Tue, 21 Nov 2023 06:40:51 -0800
From:   Guillaume Ranquet <granquet@...libre.com>
To:     Ní colas F. R. A. Prado 
        <nfraprado@...labora.com>, Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, kernel@...labora.com,
        Bo-Chen Chen <rex-bc.chen@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>, Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Guillaume Ranquet <granquet@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2] drm/mediatek: dp: Add phy_mtk_dp module as pre-dependency

On Tue, 21 Nov 2023 15:29, "Nícolas F. R. A. Prado"
<nfraprado@...labora.com> wrote:
>The mtk_dp driver registers a phy device which is handled by the
>phy_mtk_dp driver and assumes that the phy probe will complete
>synchronously, proceeding to make use of functionality exposed by that
>driver right away. This assumption however is false when the phy driver
>is built as a module, causing the mtk_dp driver to fail probe in this
>case.
>
>Add the phy_mtk_dp module as a pre-dependency to the mtk_dp module to
>ensure the phy module has been loaded before the dp, so that the phy
>probe happens synchrounously and the mtk_dp driver can probe
>successfully even with the phy driver built as a module.
>
>Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>Fixes: f70ac097a2cf ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
>Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
>Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>
>---

Reviewed-by: Guillaume Ranquet <granquet@...libre.com>
>
>Changes in v2:
>- Added missing Suggested-by tag
>
> drivers/gpu/drm/mediatek/mtk_dp.c | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
>index e4c16ba9902d..2136a596efa1 100644
>--- a/drivers/gpu/drm/mediatek/mtk_dp.c
>+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
>@@ -2818,3 +2818,4 @@ MODULE_AUTHOR("Markus Schneider-Pargmann <msp@...libre.com>");
> MODULE_AUTHOR("Bo-Chen Chen <rex-bc.chen@...iatek.com>");
> MODULE_DESCRIPTION("MediaTek DisplayPort Driver");
> MODULE_LICENSE("GPL");
>+MODULE_SOFTDEP("pre: phy_mtk_dp");
>--
>2.42.1
>