Re: cx88 invalid video opcodes when VBI enabled

["Daniel Glöckner" <daniel-gl@gmx.net>]

Hi,

On Wed, Apr 18, 2018 at 08:29:59PM +0200, Daniel Glöckner wrote:
> The VBI instruction queue read pointer points outside the VBI instruction
> queue and into the video y/packed CMDS (to 0x180000+0x11*4). The values
> next to the iq rd ptr look ok.
> 
> We only initialize the iq rd ptr to zero in cx88_sram_channel_setup and
> then never touch it again. The hardware takes care of updating it.
> Maybe cx88_sram_channel_setup is sometimes called for channel 24 while the
> VBI risc engine is still running?

for some reason I feel like buffer_queue in cx88-vbi.c should not be
calling cx8800_start_vbi_dma as it is also called a few lines further
down in start_streaming.

Devin, can you check if it helps to remove that line and if VBI still
works afterwards?

Best regards,

  Daniel