linux-kernel - Re: [PATCH] ARM: davinci: dm644x: fix out range signal for ED

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Message-ID: <CA+V-a8uFNXvb7bPv0dLKeSeNzZ9C3rvrXCNSWy+8HgiumR9sEw@mail.gmail.com>
Date:	Thu, 4 Oct 2012 10:22:06 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Manjunath Hadli <manjunath.hadli@...com>,
	VGER <linux-kernel@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	"Lad, Prabhakar" <prabhakar.lad@...com>
Subject: Re: [PATCH] ARM: davinci: dm644x: fix out range signal for ED

Hi Sekhar,

On Wed, Oct 3, 2012 at 4:08 PM, Sekhar Nori <nsekhar@...com> wrote:
> On 10/3/2012 12:05 PM, Prabhakar wrote:
>> From: Lad, Prabhakar <prabhakar.lad@...com>
>>
>> while testing display on dm644x, for ED out-range signals
>> was observed. This patch fixes appropriate clock setting
>> for ED.
>
> Can you please clarify what you mean by "out range signal"? Are there
> any user visible artifacts on the display? What was the clock being
> provided earlier and what is the value after this patch?
>
> Also, is the issue severe enough that this patch should be applied to
> stable tree as well?
>
Ideally a clock of 54Mhz is required for  enhanced definition to
work, which it was actually set to but while testing I noticed
out-of-range signal. The out-of-range signal is often caused
when the field rate is above the rate that the television will handle.
When this is the case the TV or monitor displays "Out-Of-Range Signal".

Reducing the clock fixed it. now the clock is set to 27Mhz.

Regards,
--Prabhakar

> Thanks,
> Sekhar
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