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From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: linux-watchdog@vger.kernel.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>,
	Chris Healy <cphealy@gmail.com>,
	Guenter Roeck <linux@roeck-us.net>,
	Rick Ramstetter <rick@anteaterllc.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 20/22] watchdog: ziirave_wdt: Fix DOWNLOAD_START payload
Date: Mon, 12 Aug 2019 13:09:04 -0700	[thread overview]
Message-ID: <20190812200906.31344-21-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190812200906.31344-1-andrew.smirnov@gmail.com>

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@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rick Ramstetter <rick@anteaterllc.com>
Cc: linux-watchdog@vger.kernel.org
Cc: linux-kernel@vger.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


  parent reply	other threads:[~2019-08-12 20:10 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-12 20:08 [PATCH v2 00/22] Ziirave_wdt driver fixes Andrey Smirnov
2019-08-12 20:08 ` [PATCH v2 01/22] watchdog: ziirave_wdt: Add missing newline Andrey Smirnov
2019-08-12 20:08 ` [PATCH v2 02/22] watchdog: ziirave_wdt: Be verbose about errors in probe() Andrey Smirnov
2019-08-12 20:08 ` [PATCH v2 03/22] watchdog: ziirave_wdt: Be more verbose during firmware update Andrey Smirnov
2019-08-12 20:08 ` [PATCH v2 04/22] watchdog: ziirave_wdt: Don't bail out on unexpected timeout value Andrey Smirnov
2019-08-15 18:12   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 05/22] watchdog: ziirave_wdt: Log bootloader/firmware info during probe Andrey Smirnov
2019-08-12 20:08 ` [PATCH v2 06/22] watchdog: ziirave_wdt: Simplify ziirave_firm_write_pkt() Andrey Smirnov
2019-08-15 18:14   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 07/22] watchdog: ziirave_wdt: Check packet length only once Andrey Smirnov
2019-08-15 18:14   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 08/22] watchdog: ziirave_wdt: Skip zeros when calculating checksum Andrey Smirnov
2019-08-15 18:16   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 09/22] watchdog: ziirave_wdt: Fix incorrect use of ARRAY_SIZE Andrey Smirnov
2019-08-15 18:17   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 10/22] watchdog: ziirave_wdt: Zero out only what's necessary Andrey Smirnov
2019-08-15 18:17   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 11/22] watchdog: ziirave_wdt: Make use of put_unaligned_le16 Andrey Smirnov
2019-08-15 18:18   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 12/22] watchdog: ziirave_wdt: Don't check if ihex record length is zero Andrey Smirnov
2019-08-15 18:19   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 13/22] watchdog: ziirave_wdt: Don't read out more than 'len' firmware bytes Andrey Smirnov
2019-08-15 18:19   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 14/22] watchdog: ziirave_wdt: Don't try to program readonly flash Andrey Smirnov
2019-08-15 18:21   ` Guenter Roeck
2019-08-12 20:08 ` [PATCH v2 15/22] watchdog: ziirave_wdt: Fix misleading error message Andrey Smirnov
2019-08-15 18:22   ` Guenter Roeck
2019-08-12 20:09 ` [PATCH v2 16/22] watchdog: ziirave_wdt: Fix JUMP_TO_BOOTLOADER payload Andrey Smirnov
2019-08-15 18:22   ` Guenter Roeck
2019-08-12 20:09 ` [PATCH v2 17/22] watchdog: ziirave_wdt: Fix DOWNLOAD_END payload Andrey Smirnov
2019-08-15 18:23   ` Guenter Roeck
2019-08-12 20:09 ` [PATCH v2 18/22] watchdog: ziirave_wdt: Fix RESET_PROCESSOR payload Andrey Smirnov
2019-08-15 18:23   ` Guenter Roeck
2019-08-12 20:09 ` [PATCH v2 19/22] watchdog: ziirave_wdt: Drop status polling code Andrey Smirnov
2019-08-15 18:24   ` Guenter Roeck
2019-08-12 20:09 ` Andrey Smirnov [this message]
2019-08-15 18:24   ` [PATCH v2 20/22] watchdog: ziirave_wdt: Fix DOWNLOAD_START payload Guenter Roeck
2019-08-12 20:09 ` [PATCH v2 21/22] watchdog: ziirave_wdt: Drop ziirave_firm_write_block_data() Andrey Smirnov
2019-08-15 18:25   ` Guenter Roeck
2019-08-12 20:09 ` [PATCH v2 22/22] watchdog: ziirave_wdt: Update checked I2C functionality mask Andrey Smirnov
2019-08-15 18:25   ` Guenter Roeck

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