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From: mfuzzey@parkeon.com (Martin Fuzzey)
To: linux-arm-kernel@lists.infradead.org
Subject: i.MX53 suspend to RAM
Date: Wed, 19 Mar 2014 14:52:58 +0100	[thread overview]
Message-ID: <5329A13A.7080307@parkeon.com> (raw)
In-Reply-To: <CAOMZO5Bg2zaGwptGwiVgagaCQCLDgMQfN=5_RwS0tLV0ketxPg@mail.gmail.com>

Hi Fabio,

On 16/03/14 15:39, Fabio Estevam wrote:
> I will try to stress test suspend/resume on mx53qsb and will let you know.

After doing some more digging it seems the problem is actually the 
staging IPU driver imx-drm.

That driver currently has no suspend code and does not stop DMA.

If I remove the driver I can reliably suspend and resume (>500 cycles ok)

So sorry for the noise.


Are there any suspend/resume patches for that driver floating around?

I have tried to do something similar to the Freescale driver (wait for 
DMA channels to idle then disable them)
but, while this also fixes the suspend/resume hang, there is sometimes 
no or shifted display on resume.


Regards,

Martin

  reply	other threads:[~2014-03-19 13:52 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-14 10:21 i.MX53 suspend to RAM Martin Fuzzey
2014-03-16 14:39 ` Fabio Estevam
2014-03-19 13:52   ` Martin Fuzzey [this message]
2014-03-19 16:27     ` Fabio Estevam

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