On 17 April 2014 10:56, Joachim Eastwood <manabian@xxxxxxxxx> wrote:
> On 17 April 2014 09:24, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote:
>> On 16/04/14 19:11, Joachim Eastwood wrote:
>>> On 16 April 2014 07:40, Tomi Valkeinen <tomi.valkeinen@xxxxxx> 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@xxxxxxxxx>
>>
>> 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.
>
> Works like a charm here :)
> Replugging the HDMI monitor and everything.
>
> But I notice something strange on the monitor. Around the white login
> text there are small blinking green dots. So maybe there is a timing
> issue here?
That turned out to be my HDMI cable...
Changed to shorter cable and the green dots disappeared. Sorry for the
false alarm.
regards
Joachim Eastwood
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