edi: Add dummy read to ensure proper detection of ENE chips

ENE chips enable EDI by detecting a clock frequency between 1 MHz and 8 MHz.
In many cases, the chip won't be able to both detect the clock signal and
serve the associated request at the same time.

Thus, a dummy read has to be added to ensure that EDI is enabled and
operational starting from the next request.

Change-Id: I69ee71674649cd8ba4fc635f889cb39a1cd204b9
Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/23260
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed