The datasheet also says:
"In autoconfiguration mode, the default value for the vertical blanking
delay, VBLANK
(0x474 an 0x475) is set to 22 and 34, respectively, for each video
standard."
So maybe we should just let it autoconfigure.
Also, I've never noticed this before, but why does vbi_reg_setup write
to 0x474 and 0x475? These are only VBLANK and VACTIVE, so those should
be set up when setting the standard, right? Granted, VBLANK controls
the size of the VBI region, but I don't think this is the place to set
it, especially considering it doesn't currently take video standard into
account.
Ben Lancki wrote:
This was one of the last visual things bugging me with the driver. The
screen always appeared vertically offset by 10-15 pixels from the
broadcast video. According to the cx25840 documentation, VBLANK should
be 22 for NTSC and 34 for PAL/SECAM. This patch sets it to 22 or 34
depending on the card region (although I can only test NTSC). It was
originally set to 36 so probably NTSC people will be the only ones to
notice any big difference.
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