Hi,
Dne ponedeljek, 15. maj 2017 ob 08:31:22 CEST je Maxime Ripard napisal(a):
> On Sat, May 13, 2017 at 11:14:00PM +0800, Chen-Yu Tsai wrote:
> > >>> +static int sunxi_tve_get_plug_in_status(void)
> > >>> +{
> > >>> + struct sunxi_tve_reg * const tve =
> > >>> + (struct sunxi_tve_reg *)SUNXI_TVE0_BASE;
> > >>> + u32 status;
> > >>> +
> > >>> + status = readl(&tve->auto_detect_status) &
> > >>> + SUNXI_TVE_AUTO_DETECT_STATUS_MASK(0);
> > >>> +
> > >>> + return status == SUNXI_TVE_AUTO_DETECT_STATUS_CONNECTED;
> > >
> > > So TVE is now capable of hpd checking, right?
> > >
> > > Is is a feature that exists in A10/A13/A20 or is it new in H3?
> >
> > AFAIK this is also available in the earlier SoCs.
> > Maxime mentioned that it was unreliable though.
>
> This was supposed to be there, but those registers were
> undocumented. It would be nice to try to see if it works.
AFAIK, H3 and newer SoCs with TV out have two additional registers for hot
plug detection. Here are named SUNXI_TVE_AUTO_DETECT_CFG0 and
SUNXI_TVE_AUTO_DETECT_CFG1 and they are somewhat explained in R40 manual.
I'm not sure if this changes reliability a lot or not.
Best regards,
Jernej
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