[Intel-gfx] [GMA500/CDV] HDMI AVI infoframe code

[Patrik Jakobsson]

On Mon, Nov 11, 2013 at 6:57 AM, Gohad, Tushar <tushar.gohad at intel.com> wrote:
> Folks,

Hi

>From what I've seen there are no real HDMI connectors on either Poulsbo or
Cedarview. It's just DVI with HDMI connectors. Though you might know of other
hardware that I don't.

SDVO_CMD_GET_SUPP_ENCODE always fails on my SDVO chips so maybe that can be
pulled out of the gma500 driver entirely. Or it can stay and be fixed
if hardware exists.

Cheers
Patrik

> When trying to get the GMA500 or the CDV DRM driver https://github.com/thomas001/cedarview-drm (w/ 3.8 Linux kernel) pass HDMI compliance, we are seeing failures of the nature:
>
>  "Verify that an AVI InfoFrame is transmitted on every two video fields.
>   Error : No Legal AVI InfoFrame exists on two video fields."
>
> Apparently, "avi_*_info_t" structures are defined in https://github.com/thomas001/cedarview-drm/blob/master/staging/cdv/drv/psb_intel_hdmi.h the header but are never used.
>
> In https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/gma500/psb_intel_sdvo.c, I do see psb_intel_sdvo_set_avi_infoframe(), but appears to be really old based on the comment that says "HDMI is not supported yet".   Can any of the gma500/i915 code be reused for CDV infoframe code?  Has anyone already done this is what I am trying to find out.
>
> Many thanks,
> Tushar