[Intel-gfx] [RFC 0/2] Compile out integrated

[Lucas De Marchi]

On Tue, Feb 01, 2022 at 11:15:31AM +0000, Tvrtko Ursulin wrote:
>From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
>Quicky and dirty hack based on some old ideas. Thought maybe the approach might
>interest the Arm port guys. But with IS_GEN_RANGE removed easy gains are not so
>big so meh.. Maybe some more easy wins with IS_DISPLAY_VER but I haven't looked
>into that side.
>
> 3884664  449681    6720 4341065  423d49 i915.ko.tip
> 3599989  429034    6688 4035711  3d947f i915.ko.noigp

By these numbers probably it's hard to justify. Another thing to consider
is that it's very common to have on the same system both
integrated and discrete - doing this would remove at compile time any
chance of driving the integrated one.

Lucas De Marchi

>
>Note debug kconfig so everything is inflated. Whether or not the relative gain
>would change with production kconfig I am not sure.
>
>P.S.
>I was a bit curious there were no build errors around functions no longer used
>so either there were none (would mean patch is not really that effective), or
>something changed with compiler warnings/smarts. Haven't looked into it.
>
>Tvrtko Ursulin (2):
>  igp kconfig
>  jsl/ehl
>
> drivers/gpu/drm/i915/Kconfig                  |   5 +
> drivers/gpu/drm/i915/Kconfig.platforms        |   7 +
> .../drm/i915/display/intel_ddi_buf_trans.c    |   4 +-
> drivers/gpu/drm/i915/display/intel_dpll_mgr.c |   2 +-
> drivers/gpu/drm/i915/i915_drv.h               | 128 +++++++++++-------
> drivers/gpu/drm/i915/i915_pci.c               |  44 +++++-
> 6 files changed, 134 insertions(+), 56 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/Kconfig.platforms
>
>-- 
>2.32.0
>