[SRU][Artful][PATCH 0/2] Fixes for LP:1742696

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1742696

== SRU Justification ==
This bug was forked out of Bug #1734147 "corrupted BIOS due to Intel SPI 
bug in kernel".  When trying to apply the fix in Bug #1734147 to a Lenovo 
Yoga with Serial Flash s25fl064k, the actual fix works, however reverting 
back to original available Kernel <4.14.x again locks the BIOS for write.

Explanation from Bug #1734147, Comment #524:
"Commit d9018976cdb6 is missing with this particular BIOS/system because 
every time you boot the system, the BIOS resets to default when it finds 
BCR register is changed. This is different issue than the CMP=1 issue most 
of the users have reported. This one also is not permanent so everything 
is fine as long as you don't touch that BCR register. In this case you 
either need to always boot to a kernel where that fix (d9018976cdb6) is 
included or blacklist lpc_ich.ko. Ubuntu v4.14.x kernels have that fix 
included so you might want to take one of them or build your own."

The two commits that fix this bug are already in Bionic, so they 
are only needed in Artful.  Commit 9d63f17661e25f is also needed for this 
issue and was cc'd to stable.  However, upstream 4.13 is EOL, so it is being
requested in this SRU request.

== Fixes ==
d9018976cdb6 ("mfd: lpc_ich: Do not touch SPI-NOR write protection bit on Haswell/Broadwell")
9d63f17661e2 ("spi-nor: intel-spi: Fix broken software sequencing codes")

== Regression Potential ==
Low, these patches fix an existing critical regression.

== Test Case ==
A test kernel was built with these patches and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.


Bin Meng (1):
  spi-nor: intel-spi: Fix broken software sequencing codes

Mika Westerberg (1):
  mfd: lpc_ich: Do not touch SPI-NOR write protection bit on
    Haswell/Broadwell

 drivers/mfd/lpc_ich.c           | 10 ----------
 drivers/mtd/spi-nor/intel-spi.c |  4 ++--
 2 files changed, 2 insertions(+), 12 deletions(-)

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2.7.4