Change in flashrom[master]: edi: Add dummy read to ensure proper detection of ENE chips

[Nico Huber (Code Review)]

Nico Huber has submitted this change and it was merged. ( https://review.coreboot.org/23260 )

Change subject: edi: Add dummy read to ensure proper detection of ENE chips
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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 
Signed-off-by: Paul Kocialkowski 
Reviewed-on: https://review.coreboot.org/23260
Reviewed-by: Nico Huber 
Tested-by: build bot (Jenkins) 
---
M edi.c
1 file changed, 12 insertions(+), 0 deletions(-)

Approvals:
  Nico Huber: Looks good to me, approved
  build bot (Jenkins): Verified
  Paul Kocialkowski: Looks good to me, approved

diff --git a/edi.c b/edi.c
index 0ca1704..9397a54 100644
--- a/edi.c
+++ b/edi.c
@@ -480,6 +480,18 @@
 {
    int probe;
    int rc;
+	unsigned char hwversion;
+
+	/*
+	 * 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. This dummy read below
+	 * draws the chip's attention and as result the chip enables its EDI.
+	 */
+	edi_read(flash, ENE_EC_HWVERSION, &hwversion);

probe = edi_chip_probe(flash, &ene_kb9012);
    if (!probe)