[Intel-gfx] Question about CCS modifier on GLK

[Ville Syrjälä]

On Sun, Dec 17, 2017 at 10:45:13PM -0200, Gabriel Krisman Bertazi wrote:
> 
> Hi Ben and list folks,
> 
> I've been investigating some CI failures with the kms_ccs testcase in
> the GLK hardware.  The original bug is linked below, but there are other
> more basic tests failing when trying CCS on pipe C.
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=104096
> 
> The reason for the failure is very straightforward, the function
> skl_check_ccs_aux_surface() in intel_display.c rejects CCS modifiers for
> PIPE_C, since that is not supported for SKL, KBL and as far as I can
> tell APL as well.
> 
> But, since I don't have the specs for GLK yet (it's not available in
> 01.org), I can't tell if GLK will support it and the kernel must be
> changed or if the testcase itself is bogus.  My money is on the later,
> but I could use a confirmation before writing down the patch.
> 
> In short, does pipe C support render compression (ccs modifier) in glk?

No. But the current code is somewhat busted anyway. See
https://patchwork.freedesktop.org/series/29308/

-- 
Ville Syrjälä
Intel OTC