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Message-Id: <20190812200906.31344-21-andrew.smirnov@gmail.com>
Date: Mon, 12 Aug 2019 13:09:04 -0700
From: Andrey Smirnov <andrew.smirnov@...il.com>
To: linux-watchdog@...r.kernel.org
Cc: Andrey Smirnov <andrew.smirnov@...il.com>,
Chris Healy <cphealy@...il.com>,
Guenter Roeck <linux@...ck-us.net>,
Rick Ramstetter <rick@...eaterllc.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 20/22] watchdog: ziirave_wdt: Fix DOWNLOAD_START payload
Bootloader firmware expects the following traffic for DOWNLOAD_END:
S Addr Wr [A] 0x10 [A] P
using ziirave_firm_write_byte() will result in
S Addr Wr [A] 0x10 [A] 0x01 [A] 0x01 [A] P
which happens to work because firmware will ignore any extra bytes
sent. Fix this by converting the code to use i2c_smbus_write_byte()
instead.
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Chris Healy <cphealy@...il.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Rick Ramstetter <rick@...eaterllc.com>
Cc: linux-watchdog@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
drivers/watchdog/ziirave_wdt.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index 681f65349779..ed69fa82e09c 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -217,13 +217,6 @@ static int ziirave_firm_write_block_data(struct watchdog_device *wdd,
return ret;
}
-static int ziirave_firm_write_byte(struct watchdog_device *wdd, u8 command,
- u8 byte, bool wait_for_ack)
-{
- return ziirave_firm_write_block_data(wdd, command, 1, &byte,
- wait_for_ack);
-}
-
static bool ziirave_firm_addr_readonly(u32 addr)
{
return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
@@ -375,12 +368,18 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
msleep(500);
- ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_START, 1, true);
+ ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START);
if (ret) {
dev_err(&client->dev, "Failed to start download\n");
return ret;
}
+ ret = ziirave_firm_read_ack(wdd);
+ if (ret) {
+ dev_err(&client->dev, "No ACK for start download\n");
+ return ret;
+ }
+
msleep(500);
for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
--
2.21.0
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