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Message-ID: <7822b114-0ccd-0344-cea0-760b892c85e1@baylibre.com>
Date:   Thu, 20 Jul 2023 15:03:00 +0200
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Subject: Re: [PATCH v6 06/11] drm/mediatek: dp: Enable event interrupt only
 when bridge attached
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To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>, chunkuang.hu@kernel.org
Cc:     p.zabel@pengutronix.de, airlied@gmail.com, daniel@ffwll.ch,
        matthias.bgg@gmail.com, dri-devel@lists.freedesktop.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, kernel@collabora.com,
        wenst@chromium.org, nfraprado@collabora.com
References: <20230717141438.274419-1-angelogioacchino.delregno@collabora.com>
 <20230717141438.274419-7-angelogioacchino.delregno@collabora.com>
From:   Alexandre Mergnat <amergnat@baylibre.com>
In-Reply-To: <20230717141438.274419-7-angelogioacchino.delregno@collabora.com>
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On 17/07/2023 16:14, AngeloGioacchino Del Regno wrote:
> It is useless and error-prone to enable the DisplayPort event interrupt
> before finishing to probe and install the driver, as the DP training
> cannot happen before the entire pipeline is correctly set up, as the
> interrupt handler also requires the full hardware to be initialized by
> mtk_dp_bridge_attach().
> 
> Anyway, depending in which state the controller is left from the
> bootloader, this may cause an interrupt storm and consequently hang
> the kernel during boot, so, avoid enabling the interrupt until we
> reach a clean state by adding the IRQ_NOAUTOEN flag before requesting
> it at probe time and manage the enablement of the ISR in the .attach()
> and .detach() handlers for the DP bridge.

Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>

-- 
Regards,
Alexandre