linux-kernel - Re: [PATCH] OMAPDSS: HDMI5: Change DDC timings

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Message-ID: <5718E5F3.2080504@ti.com>
Date:	Thu, 21 Apr 2016 17:38:43 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	"J.D. Schroeder" <Linux.HWI@...min.com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>, <misael.lopez@...com>
CC:	"Lodes, Jim" <jim.lodes@...min.com>,
	"J.D. Schroeder" <jay.schroeder@...min.com>
Subject: Re: [PATCH] OMAPDSS: HDMI5: Change DDC timings

Hi,

On 21/04/16 03:02, J.D. Schroeder wrote:
> From: "Lodes, Jim" <jim.lodes@...min.com>
> 
> The DDC scl high and low times were set to the minimum values
> from the i2c specification, but the i2c specification takes into
> account the rise time and fall time to calculate the frequency.
> To pass HDMI certification DDC can not exceed 100kHz therefore in
> a system where the rise times and fall times are negligible the high
> and low times for scl need to be 10us.

Thanks, makes sense. Did you measure the rise & fall times? Do you get
more or less exactly 100kHz with the new times?

> Signed-off-by: Lodes, Jim <jim.lodes@...min.com>

The email format should be

Firstname Lastname <firstname.lastname@....bar>

Or something similar, but not "Lastname, Firstname"

 Tomi



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