Change in flashrom[master]: flashchips: reset a M25P10-A before a probe

[Lubomir Rintel (Code Review)]

Lubomir Rintel has uploaded this change for review. ( https://review.coreboot.org/23337

Change subject: flashchips: reset a M25P10-A before a probe
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flashchips: reset a M25P10-A before a probe

I have a ST chip here labeled "25P10VP". Initially it doesn't respond to
any commands but a RES, to which it responds 0x10 (like a "M25P10").
After that it quacks like a "M25P10-A" -- provides the same RDID and
supports 256B writes.

Perhaps a regular "M25P10-A" does the same?

Change-Id: I19a5332756d15b3cb74609c44a8d3fed2f4a2d68
---
M chipdrivers.h
M flashchips.c
M spi25.c
3 files changed, 12 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/37/23337/1

diff --git a/chipdrivers.h b/chipdrivers.h
index 8405220..69e68fd 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -34,6 +34,7 @@

/* spi25.c */
 int probe_spi_rdid(struct flashctx *flash);
+int probe_spi_res1_rdid(struct flashctx *flash);
 int probe_spi_rdid4(struct flashctx *flash);
 int probe_spi_rems(struct flashctx *flash);
 int probe_spi_res1(struct flashctx *flash);
diff --git a/flashchips.c b/flashchips.c
index e389af6..1ff2de6 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -8948,7 +8948,7 @@
    	.page_size	= 256,
    	.feature_bits	= FEATURE_WRSR_WREN,
    	.tested		= TEST_OK_PREW,
-		.probe		= probe_spi_rdid,
+		.probe		= probe_spi_res1_rdid,
    	.probe_timing	= TIMING_ZERO,
    	.block_erasers	=
    	{
diff --git a/spi25.c b/spi25.c
index 00e0992..51b27e3 100644
--- a/spi25.c
+++ b/spi25.c
@@ -149,6 +149,16 @@
    return probe_spi_rdid_generic(flash, 3);
 }

+int probe_spi_res1_rdid(struct flashctx *flash)
+{
+	unsigned char readarr[1];
+
+	if (spi_res(flash, readarr, 1)) {
+		return 0;
+	}
+	return probe_spi_rdid_generic(flash, 3);
+}
+
 int probe_spi_rdid4(struct flashctx *flash)
 {
    /* Some SPI controllers do not support commands with writecnt=1 and