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

[Brian Norris (Code Review)]

Brian Norris has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/80771?usp=email )

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

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/71/80771/1

diff --git a/linux_mtd.c b/linux_mtd.c
index 495db9a..eea0cf2 100644
--- a/linux_mtd.c
+++ b/linux_mtd.c
@@ -429,6 +429,14 @@
    return FLASHROM_WP_ERR_RANGE_LIST_UNAVAILABLE;
 }

+static void linux_mtd_nop_delay(const struct flashctx *flash, unsigned int usecs)
+{
+	/*
+	 * Ignore delay requests. The Linux MTD framework brokers all flash
+	 * protocol, including timing, resets, etc.
+	 */
+}
+
 static const struct opaque_master linux_mtd_opaque_master = {
    /* max_data_{read,write} don't have any effect for this programmer */
    .max_data_read	= MAX_DATA_UNSPECIFIED,
@@ -441,6 +449,7 @@
    .wp_read_cfg	= linux_mtd_wp_read_cfg,
    .wp_write_cfg	= linux_mtd_wp_write_cfg,
    .wp_get_ranges	= linux_mtd_wp_get_available_ranges,
+	.delay		= linux_mtd_nop_delay,
 };

/* Returns 0 if setup is successful, non-zero to indicate error */