On 16/06/13 15:28, Igor Grinberg wrote: >>> Although one thing is missing from the tfp410 driver is >>> the PD GPIO polarity. I had to adjust it locally to get the DVI working. >>> The original polarity was high = disabled, low = enabled. > >> Hmm, but this is missing from the old driver also, isn't it? At least >> with a quick glance the old and new tfp410 drivers do the same thing >> with the PD gpio. > > Well, we were driving the PD GPIO from the board file...
Ah, I see. That was inverted PD handling was removed in 3.5, by accident as far as I see. So DVI on cm-t35 has been broken since? I wonder how that should be fixed... The tfp410 driver handles it correctly, as the PD gpio is active low (i.e. high == tfp410 enabled), so having it inverted is a board specific thing. Do you know what is the reason to have it inverted? There seems to be OF_GPIO_ACTIVE_LOW, but I'm not sure how it should be used, as I don't see anyone setting that flag... And supporting that would mean, in principle, that every driver should support inverting the gpio with every gpio they have. Tomi
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