[XS] Change in flashrom[main]: linux_mtd: Provide no-op delay implementation

[Brian Norris (Code Review)]

Attention is currently required from: Brian Norris, Hsuan-ting Chen, Nikolai Artemiev.

Hello Anastasia Klimchuk, Hsuan-ting Chen, Nikolai Artemiev, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/80771?usp=email

to look at the new patch set (#2).

The following approvals got outdated and were removed:
Code-Review+2 by Hsuan-ting Chen, Code-Review+2 by Nikolai Artemiev, Verified+1 by build bot (Jenkins)

Change subject: linux_mtd: Provide no-op delay implementation
......................................................................

linux_mtd: Provide no-op delay implementation

Flashrom has several magic programmer_delay() calls scattered throughout
its codebase (see cli_classic.s/main() and
flashrom.c/flashrom_image_write(), at least). These delays are
superfluous for the linux_mtd programmer, because it's an opaque
programmer in which all protocol details are handled by the kernel
driver.

Stub out the delay function, so we don't waste up to 1.1 seconds of
needless delay time, depending on the operation and CLI vs libflashrom
usage.

BUG=b:325539928
TEST=`elogtool add 0xa7` on a linux_mtd system (such as a Mediatek
       Chromebook):
     Time improvement - reduces from ~1.5s wall clock to about 0.4s
     CPU usage: -90%, as most of the CPU cycles (before this change) are
       spent in needless magic-delay busy loops

Change-Id: I3ac69d3fd7cfc689c5b32c130d044516ed846c29
Signed-off-by: Brian Norris 
---
M linux_mtd.c
1 file changed, 9 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/71/80771/2