drm/i915/icl: do a posting read after irq install

When reading GEN11_GT_INTR_DWx closely after enabling the interrupts
in gen11_irq_postinstall, the returned value is garbage. This can
cause other parts of the setup code (e.g. gen11_reset_one_iir) to
think that there are interrupts to be cleared when there are none.

The garbage value is only seen on the first read done after the enable,
so this looks like a posting issue. Adding a posting read after enabling
the interrupts does indeed fix the problem.

Note that the posting read has been purposely added outside of
gen11_master_intr_enable since the issue has only been observed when the
full interrupt setup is performed.

Cc: Mika Kuoppala <[email protected]>
Signed-off-by: Daniele Ceraolo Spurio <[email protected]>
Acked-by: Chris Wilson <[email protected]>
Acked-by: Mika Kuoppala <[email protected]>
Signed-off-by: Mika Kuoppala <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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