Re: [PATCH] OMAPDSS: HDMI5: Change DDC timings
From: Tomi Valkeinen <hidden>
Date: 2016-04-21 14:38:51
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From: Tomi Valkeinen <hidden>
Date: 2016-04-21 14:38:51
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Hi, On 21/04/16 03:02, J.D. Schroeder wrote:
From: "Lodes, Jim" <redacted> 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 <redacted>
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