Date: Mon, 14 Apr 2014 22:31:48 +0100
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Philipp Zabel <p.zabel@pengutronix.de>
Cc: devel@driverdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        kernel@pengutronix.de
Subject: Re: [PATCH 0/7] Reorder i.MX IPU display enable/disable sequence
Message-ID: <20140414213148.GN24070@n2100.arm.linux.org.uk>
References: <1397488895-17930-1-git-send-email-p.zabel@pengutronix.de>
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On Mon, Apr 14, 2014 at 05:21:28PM +0200, Philipp Zabel wrote:
> Repeatedly enabling and disabling the display currently can lead to a state
> in which the IPU doesn't produce a valid signal anymore because we disable
> IPU submodules before they can finish their interaction.

I'm afraid to say that after adding these patches, I find that when Xorg
starts, the thing appears to lock up.

Bisecting points at:

imx-drm: ipu-dc: Wait for DC_FC_1 / DP_SF_END interrupt

being the culpret - booting with the patches up to and including:

imx-drm: ipu-dmfc: Wait for FIFOs to run empty before disabling

works fine.

-- 
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improving, and getting towards what was expected from it.
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