Change in flashrom[master]: writeprotect.c: refactor and fix wp_mode functions

[Nikolai Artemiev (Code Review)]

Nikolai Artemiev has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/62643 )

Change subject: writeprotect.c: refactor and fix wp_mode functions
......................................................................

writeprotect.c: refactor and fix wp_mode functions

Use a lookup table in get_wp_mode() and drop the srp_bit_present check,
since a chip without SRP is just FLASHROM_WP_MODE_DISABLED.

Add a srp_bit_present check to set_wp_mode() if the mode requires it.

BUG=b:182223106
BRANCH=none
TEST=builds

Change-Id: Ib6c347453f9216e5816e4ed35bf9783fd3c720e0
Signed-off-by: Nikolai Artemiev 
---
M writeprotect.c
1 file changed, 13 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/43/62643/1

diff --git a/writeprotect.c b/writeprotect.c
index 6b3bbcf..5893593 100644
--- a/writeprotect.c
+++ b/writeprotect.c
@@ -351,16 +351,17 @@
 /** Get the mode selected by a WP configuration. */
 static int get_wp_mode(enum flashrom_wp_mode *mode, const struct wp_bits *bits)
 {
-	if (!bits->srp_bit_present)
-		return FLASHROM_WP_ERR_CHIP_UNSUPPORTED;
+	const enum flashrom_wp_mode wp_modes[2][2] = {
+		{
+			FLASHROM_WP_MODE_DISABLED,	/* srl=0, srp=0 */
+			FLASHROM_WP_MODE_HARDWARE,	/* srl=0, srp=1 */
+		}, {
+			FLASHROM_WP_MODE_POWER_CYCLE,	/* srl=1, srp=0 */
+			FLASHROM_WP_MODE_PERMANENT,	/* srl=1, srp=1 */
+		},
+	};

-	if (bits->srl_bit_present && bits->srl == 1) {
-		*mode = bits->srp ? FLASHROM_WP_MODE_PERMANENT :
-				    FLASHROM_WP_MODE_POWER_CYCLE;
-	} else {
-		*mode = bits->srp ? FLASHROM_WP_MODE_HARDWARE :
-				    FLASHROM_WP_MODE_DISABLED;
-	}
+	*mode = wp_modes[bits->srl][bits->srp];

return FLASHROM_WP_OK;
 }
@@ -375,6 +376,9 @@
    	return FLASHROM_WP_OK;

case FLASHROM_WP_MODE_HARDWARE:
+		if (!bits->srp_bit_present)
+			return FLASHROM_WP_ERR_CHIP_UNSUPPORTED;
+
    	bits->srl = 0;
    	bits->srp = 1;
    	return FLASHROM_WP_OK;