On 16/04/14 19:11, Joachim Eastwood wrote:
> On 16 April 2014 07:40, Tomi Valkeinen <tomi.valkeinen@ti.com> wrote:
>> On 15/04/14 20:36, Joachim Eastwood wrote:
>>> Hello,
>>>
>>> I am trying to get HDMI work with DT on my VAR-STK-OM44 (4460) board.
>>> But during kernel boot I get the following message:
>>>
>>> [ 0.953796] ------------[ cut here ]------------
>>> [ 0.953826] WARNING: CPU: 0 PID: 1 at
>>> drivers/video/omap2/dss/dss.c:483 dss_set_fck_rate+0x7c/0x8c()
>>> [ 0.953826] clk rate mismatch: 153600000 != 170666666
>>
>> I have a fix (attached) for this in fbdev-fixes, which I'll probably be
>> sending to Linus today. I couldn't send it in the main fbdev pull
>> request, as it depended on clk driver changes. And it's not fatal, most
>> likely things work fine even with the warning.
> 
> The warning disappeared after the patch. Thanks.
> Feel free to add: Tested-By: Joachim Eastwood <manabian@gmail.com>

Thanks. It should be in -rc2.

> This board (VAR-STK-OM44) has a TPD12S521 which has no controllable
> settings so adding a driver for it would be pretty meaningless. I
> think it's the same situation with Gumstix Parlor. That board also
> just have a very simple HDMI transmitter which shouldn't require a
> driver.
> 
> But never the less I got HDMI working on my board adding the tpd21s015
> nodes and providing a dummy gpio for "CT CP HPD". This works but it's
> a bit hacky.

Remove the tpd21s015 nodes and try the attached patch. It adds HPD
support to the hdmi connector. You also need something like this for the
hdmi-connector node:


pinctrl-names = "default";
pinctrl-0 = <&hdmi_conn_pins>;

hpd-gpios = <&gpio7 1 GPIO_ACTIVE_HIGH>; /* GPIO 193, HPD */


And the respective pinctrl node:

hdmi_conn_pins: pinmux_hdmi_conn_pins {
        pinctrl-single,pins = <
                0x0fe (PIN_INPUT_PULLDOWN | MUX_MODE6)
        >;
};

Note that I tested this yesterday on one board, but I couldn't get it
working yet, so no promises =). But that may be an issue with the HPD
pin on the board.

> One other thing.
> Does HDMI audio work with DT or is that a still TODO?
> I am only getting probe deferral's from omap-hdmi-audio. Haven't look
> to far into it.

It's still on the works. If you volunteer for testing it (and Jyri needs
someone to test), you can ask Jyri Sarha.

 Tomi