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List:       linux-clk
Subject:    Re: [PATCH 5/5] drm/vc4: hdmi: Make sure the controller is powered in detect
From:       nicolas saenz julienne <nsaenz () kernel ! org>
Date:       2021-09-30 15:55:29
Message-ID: 878837a91b4174ec2534be7fe2506b975e23d8d1.camel () kernel ! org
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On Wed, 2021-09-22 at 14:54 +0200, Maxime Ripard wrote:
> If the HPD GPIO is not available and drm_probe_ddc fails, we end up
> reading the HDMI_HOTPLUG register, but the controller might be powered
> off resulting in a CPU hang. Make sure we have the power domain and the
> HSM clock powered during the detect cycle to prevent the hang from
> happening.
> 
> Fixes: 4f6e3d66ac52 ("drm/vc4: Add runtime PM support to the HDMI encoder driver")
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
> ---

Reviewed-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
Tested-by: Nicolas Saenz Julienne <nsaenz@kernel.org>

Regards,
Nicolas

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