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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2019-08-12 13:09:04 -0700 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2019-09-17 08:59:09 +0200 |
| commit | fa0d2f44aa6879e21843d517138510ccb7e1e39f (patch) | |
| tree | eb3d9ee1c5785ee917b29a3a58b584123f6fa3bc /drivers/watchdog | |
| parent | fe05178c7891c546e07e24836c0af967996766c6 (diff) | |
| download | linux-fa0d2f44aa6879e21843d517138510ccb7e1e39f.tar.bz2 | |
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@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
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20190812200906.31344-21-andrew.smirnov@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/ziirave_wdt.c | 15 |
1 files 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)) { |