Re: [PATCH v6 3/5] drm: handle HAS_IOPORT dependencies

[Lucas De Marchi]

On Mon, Oct 07, 2024 at 01:40:21PM +0200, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> compile time. We thus need to add HAS_IOPORT as dependency for those
> drivers using them. In the bochs driver there is optional MMIO support
> detected at runtime, warn if this isn't taken when HAS_IOPORT is not
> defined.
>
> There is also a direct and hard coded use in cirrus.c which according to
> the comment is only necessary during resume.  Let's just skip this as
> for example s390 which doesn't have I/O port support also doesen't
> support suspend/resume.
>
> Co-developed-by: Arnd Bergmann <arnd@xxxxxxxxxx>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxxxx>
> Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/gma500/Kconfig |  2 +-
> drivers/gpu/drm/qxl/Kconfig    |  1 +
> drivers/gpu/drm/tiny/bochs.c   | 17 +++++++++++++++++
> drivers/gpu/drm/tiny/cirrus.c  |  2 ++
> drivers/gpu/drm/xe/Kconfig     |  2 +-

as an example:
$ git grep -lw outb -- drivers/gpu/drm/
drivers/gpu/drm/gma500/cdv_device.c
drivers/gpu/drm/i915/display/intel_vga.c
drivers/gpu/drm/qxl/qxl_cmd.c
drivers/gpu/drm/qxl/qxl_irq.c
drivers/gpu/drm/tiny/bochs.c
drivers/gpu/drm/tiny/cirrus.c

you are adding the dependency on xe, but why are you keeping i915 out?
What approach did you use to determine the dependency?

Lucas De Marchi