From 112d2a4e696d319a52fa1b4bebd790b31e58c30e Mon Sep 17 00:00:00 2001
From: Riku Viitanen <riku.viitanen@protonmail.com>
Date: Sun, 28 Jan 2024 02:01:36 +0200
Subject: flashprog: apply the good old MX25 workaround
---
.../patches/0001-Workaround-for-MX25-chips.patch | 87 ++++++++++++++++++++++
1 file changed, 87 insertions(+)
create mode 100644 config/flashprog/patches/0001-Workaround-for-MX25-chips.patch
(limited to 'config/flashprog/patches')
diff --git a/config/flashprog/patches/0001-Workaround-for-MX25-chips.patch b/config/flashprog/patches/0001-Workaround-for-MX25-chips.patch
new file mode 100644
index 00000000..b4fd904b
--- /dev/null
+++ b/config/flashprog/patches/0001-Workaround-for-MX25-chips.patch
@@ -0,0 +1,87 @@
+From 294433aeac82764ea22caf0c17b05cf4127aaa19 Mon Sep 17 00:00:00 2001
+From: consts <grudnevkv@gmail.com>
+Date: Fri, 2 Mar 2018 07:03:37 +0000
+Subject: [PATCH] Workaround for MX25 chips
+
+TEST: In-system programming a ThinkPad X200 using a clip and
+pico-serprog works now. It just doesn't without this hack.
+
+Chip: MX25L6405D
+
+Tested-by: Riku Viitanen <riku.viitanen@protonmail.com>
+Change-Id: I43a306b67862b59c1dcd02729e189f3bf73f481b
+---
+ cli_classic.c | 5 +++++
+ include/programmer.h | 1 +
+ spi.c | 9 +++++++++
+ 3 files changed, 15 insertions(+)
+
+diff --git a/cli_classic.c b/cli_classic.c
+index 1ffe4dd..3b50d23 100644
+--- a/cli_classic.c
++++ b/cli_classic.c
+@@ -67,6 +67,7 @@ static void cli_classic_usage(const char *name)
+ " -o | --output <logfile> log output to <logfile>\n"
+ " --flash-contents <ref-file> assume flash contents to be <ref-file>\n"
+ " -L | --list-supported print supported devices\n"
++ " -m | --workaround-mx keep flash busy before sending command\n"
+ #if CONFIG_PRINT_WIKI == 1
+ " -z | --list-supported-wiki print supported devices in wiki syntax\n"
+ #endif
+@@ -290,6 +291,7 @@ int main(int argc, char *argv[])
+ {"help", 0, NULL, 'h'},
+ {"version", 0, NULL, 'R'},
+ {"output", 1, NULL, 'o'},
++ {"workaround-mx", 0, NULL, 'm'},
+ {NULL, 0, NULL, 0},
+ };
+
+@@ -506,6 +508,9 @@ int main(int argc, char *argv[])
+ cli_classic_abort_usage("No log filename specified.\n");
+ }
+ break;
++ case 'm': /* --workaround-mx */
++ workaround_mx = 1;
++ break;
+ default:
+ cli_classic_abort_usage(NULL);
+ break;
+diff --git a/include/programmer.h b/include/programmer.h
+index 4fee2ef..7e78598 100644
+--- a/include/programmer.h
++++ b/include/programmer.h
+@@ -355,6 +355,7 @@ enum ich_chipset {
+ CHIPSET_GEMINI_LAKE,
+ CHIPSET_ELKHART_LAKE,
+ };
++extern int workaround_mx; /* workaround for MX25* chips, makes flash operations more reliable, less failures */
+
+ /* ichspi.c */
+ #if CONFIG_INTERNAL == 1
+diff --git a/spi.c b/spi.c
+index 6e61f53..f8f5d11 100644
+--- a/spi.c
++++ b/spi.c
+@@ -26,10 +26,19 @@
+ #include "programmer.h"
+ #include "spi.h"
+
++int workaround_mx; /* Make operations with MX25* chips more reliable */
++
+ int spi_send_command(const struct flashctx *flash, unsigned int writecnt,
+ unsigned int readcnt, const unsigned char *writearr,
+ unsigned char *readarr)
+ {
++ if (workaround_mx) {
++ const unsigned char cmd[JEDEC_READ_OUTSIZE] = {JEDEC_READ, 0, 0, 0};
++ unsigned char buf[256];
++ /* keep flash busy for some time, keep CS warm before sending actual command */
++ flash->mst->spi.command(flash, sizeof(cmd), sizeof(buf), cmd, buf);
++ }
++ /* actual command */
+ return flash->mst->spi.command(flash, writecnt, readcnt, writearr,
+ readarr);
+ }
+--
+2.43.0
+
--
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