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watchdog: ziirave_wdt: Fix DOWNLOAD_START payload

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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 <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Rick Ramstetter <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
This commit is contained in:
Andrey Smirnov 2019-08-12 13:09:04 -07:00 • committed by Wim Van Sebroeck
commit fa0d2f44aa
1 changed files with 7 additions and 8 deletions
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15
drivers/watchdog/ziirave_wdt.c
View file

@ -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)) {