Hi Hans,
On 2017-05-31 13:17, Hans Verkuil wrote:
On 05/31/17 13:00, Marek Szyprowski wrote:
Exynos5250 and Exynos542x SoCs have the same CEC hardware module as
Exynos4 SoC series, so enable support for it using the same compatible
string.
Tested on Odroid XU3 (Exynos5422) and Google Snow (Exynos5250) boards.
Thanks!
Do you know if the CEC block is always on for these devices or only if there
is a hotplug signal? That was a problem with the exynos4 odroid.
Odroid XU3 has exactly same wiring between SoC & HDMI connector (via
IP4791CZ12
chip) as Odroid U3, so I expect the same issues.
I don't have schematic for Google Snow board, so I have no idea how it works
there.
I have made a patch (not posted yet) to signal this in the device tree and
added a CEC capability to signal this to the user.
This capability will be added to 4.13 (see my patch 'cec: add CEC_CAP_NEEDS_HPD'
from May 25th) since the DisplayPort CEC tunneling feature needs it as well.
It's easy to test: don't connect an HDMI cable and run:
cec-ctl --playback
cec-ctl -t0 --image-view-on
If this returns with a NACK error, then it is OK. If you get a kernel message
that the transmit timed out, then you need this capability since CEC is disabled
without HPD.
I've checked those commands, but on all tested boards (Odroid U3+,
Odroid XU3 and
Google Snow) I get the following message:
Transmit from Unregistered to TV (255 to 0):
CEC_MSG_IMAGE_VIEW_ON (0x04)
Sequence: 19 Tx Timestamp: 175.935s
Tx, Error (1), Max Retries
I have never got a timeout message from the kernel. Do I need to enable
some kind
of CEC debugs?
> [...]
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
