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From: Tomasz Figa <tomasz.figa@gmail.com>
To: Tobias Jakobi <Liquid.Acid@gmx.net>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Daniel Drake <drake@endlessm.com>,
	ben-linux@fluff.org, kgene.kim@samsung.com, prahal@yahoo.com,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org
Subject: Re: Aw: Re: [PATCH] ARM: dts: Initial ODROID U2 support
Date: Thu, 12 Jun 2014 20:56:46 +0200	[thread overview]
Message-ID: <5399F7EE.2050001@gmail.com> (raw)
In-Reply-To: <trinity-980edcd5-a3eb-42ff-b755-cea7c1c6cd0d-1402579141856@3capp-gmx-bs65>

Hi Tobias,

On 12.06.2014 15:19, Tobias Jakobi wrote:
> Hello Marek,
> 
> since you pointed out HDMI support on the ODROID, I assume you've looked into that. I've posted about some issues with HDMI PHY and mixer some days ago here:
> http://www.spinics.net/lists/linux-samsung-soc/msg31643.html
> 
> Tomasz already suggested on IRC to CC some more people, who have worked in that area. Maybe you have an idea what is going wrong there?

Empirically we have managed to find that after bypassing the Video
Processor and using the Mixer alone [1], LCD0 power domain is no longer
needed for HDMI operation.

However there is still an issue with power-up and/or -down sequences
causing the whole system to hang when trying to power on and off HDMI
repeatedly. This is to be investigated yet.

[1] This can be achieved by setting .is_vp_enabled of
exynos4210_mxr_drv_data to 0, assuming that you have a patch applied
which adds appropriate compatible string to mixer_match_types[],
pointing to that struct.

Best regards,
Tomasz

WARNING: multiple messages have this Message-ID (diff)
From: tomasz.figa@gmail.com (Tomasz Figa)
To: linux-arm-kernel@lists.infradead.org
Subject: Aw: Re: [PATCH] ARM: dts: Initial ODROID U2 support
Date: Thu, 12 Jun 2014 20:56:46 +0200	[thread overview]
Message-ID: <5399F7EE.2050001@gmail.com> (raw)
In-Reply-To: <trinity-980edcd5-a3eb-42ff-b755-cea7c1c6cd0d-1402579141856@3capp-gmx-bs65>

Hi Tobias,

On 12.06.2014 15:19, Tobias Jakobi wrote:
> Hello Marek,
> 
> since you pointed out HDMI support on the ODROID, I assume you've looked into that. I've posted about some issues with HDMI PHY and mixer some days ago here:
> http://www.spinics.net/lists/linux-samsung-soc/msg31643.html
> 
> Tomasz already suggested on IRC to CC some more people, who have worked in that area. Maybe you have an idea what is going wrong there?

Empirically we have managed to find that after bypassing the Video
Processor and using the Mixer alone [1], LCD0 power domain is no longer
needed for HDMI operation.

However there is still an issue with power-up and/or -down sequences
causing the whole system to hang when trying to power on and off HDMI
repeatedly. This is to be investigated yet.

[1] This can be achieved by setting .is_vp_enabled of
exynos4210_mxr_drv_data to 0, assuming that you have a patch applied
which adds appropriate compatible string to mixer_match_types[],
pointing to that struct.

Best regards,
Tomasz

  reply	other threads:[~2014-06-12 18:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-12 12:44 [PATCH] ARM: dts: Initial ODROID U2 support Daniel Drake
2014-06-12 12:44 ` Daniel Drake
2014-06-12 13:03 ` Marek Szyprowski
2014-06-12 13:03   ` Marek Szyprowski
2014-06-12 13:19   ` Aw: " Tobias Jakobi
2014-06-12 13:19     ` Tobias Jakobi
2014-06-12 18:56     ` Tomasz Figa [this message]
2014-06-12 18:56       ` Tomasz Figa
2014-06-12 13:24   ` Daniel Drake
2014-06-12 13:24     ` Daniel Drake

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