[ADV7393] DRM Encoder Slave or DRM Bridge

[Vikas Patil]

On Mon, Sep 26, 2016 at 6:11 PM, Tomi Valkeinen <tomi.valkeinen at ti.com> wrote:
> On 26/09/16 15:34, Vikas Patil wrote:
>
>> Will check once I get display working, for time being I think it shows
>> connected with the hack I mentioned. I was taking about supporting
>> "interlace" via LCD here.
>
> Ah, sorry, I didn't check the context =).
>
> I don't know if adding interlace to LCD output is easy. It might be. To
> answer that, one needs to read the relevant parts of the TRM and the
> driver and see how difficult it is. I cannot give you step to step
> instructions on how to do it.
>

Thanks a lot for your quick comments. I will check that.

>>>>> If I read the above snippet right, to use progressive input, the DISPC
>>>>> needs to output at double refresh rate. So probably what you would have
>>>>> to do is in ADV driver, you have your set_timings function, where you
>>>>> should double the pix clock before you pass the timings forward to the
>>>>> DISPC's DPI driver.
>>>>>
>>>>
>>>> I have configured ADV7393 chip in following mode with the timing below
>>>> in connector-analog.tv.c. With this I am seeing continuous flicker
>>>> with nothing on display (black screen) and sometime could see the
>>>> kmscube but it seems it renders in four quadrant(i.e. once in each
>>>> quadrant). I have also tried doubling the pixel clock from 27MHz to
>>>> 54MHz in timing for non-interlaced mode of ADV7393 but with it also
>>>> nothing on display and continuous flicker.
>>>>
>>>> Do you know what might be going wrong? What should I look for to fix this?
>>>>
>>>> ** ADV config:
>>>> - 16-bit SD RGB input
>>>> - NTSC mode
>>>> - YPrPb component output (CVBS)
>>>> - non-interlaced mode
>>>>
>>>> ** Timing configured in in connector-analog.tv.c
>>>>
>>>> static const struct omap_video_timings harman_ntsc_timings = {
>>>>         .x_res          = 720,
>>>>         .y_res          = 480,
>>>>         .pixelclock     = 270000000,
>>>
>>> That's 270MHz.
>>>
>>
>> It was a typo. I have confirmed it is 27Mhz.
>
> Ok.
>
> Well, I'm not familiar with ADV7393 so it's very difficult to say
> anything. If you're certain that the video mode you give above should
> work with ADV7393 with the configuration you have done to it, then you
> might want to check the HW. Is ADV7393 connected correctly? Perhaps
> probe the lines to make sure the signal is correct?
>
> And if that's correct, then you'd need to do the same for the output.
>

Same video mode is working fine in other OS (qnx) with the same
target. Will check further.

Thanks & Regards,
Vikash