Bootloader firmware expects the following traffic for
RESET_PROCESSOR:
S Addr Wr [A] 0x0b [A] 0x01 [A] P
using ziirave_firm_write_byte() will result in
S Addr Wr [A] 0x0b [A] 0x01 [A] 0x01 [A] P
which happens to work because firmware will ignore any extra bytes and
expected magic value matches byte count sent by
i2c_smbus_write_block_data(). Fix this by converting the code to use
i2c_smbus_write_byte_data() instead.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Cc: Chris Healy <cphealy@xxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Rick Ramstetter <rick@xxxxxxxxxxxxxxx>
Cc: linux-watchdog@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
drivers/watchdog/ziirave_wdt.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index a598780d73d3..92df27350e41 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -73,6 +73,7 @@ static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
#define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e
#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC 1
+#define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC 1
#define ZIIRAVE_FW_VERSION_FMT "02.%02u.%02u"
#define ZIIRAVE_BL_VERSION_FMT "01.%02u.%02u"
@@ -433,8 +434,9 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
}
/* Reset the processor */
- ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_RESET_PROCESSOR, 1,
- false);
+ ret = i2c_smbus_write_byte_data(client,
+ ZIIRAVE_CMD_RESET_PROCESSOR,
+ ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC);
if (ret) {
dev_err(&client->dev,
"Failed to reset the watchdog: %d\n", ret);
--
2.21.0
