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authorAndrey Smirnov <andrew.smirnov@gmail.com>2019-08-12 13:09:03 -0700
committerWim Van Sebroeck <wim@linux-watchdog.org>2019-09-17 08:59:08 +0200
commitfe05178c7891c546e07e24836c0af967996766c6 (patch)
treebec8c645a0c2e03706977162539e3c4bdc8f38fc /drivers/watchdog
parent0007cbd517a23fe5e46328baec89ffee0269f780 (diff)
downloadlinux-fe05178c7891c546e07e24836c0af967996766c6.tar.bz2
watchdog: ziirave_wdt: Drop status polling code
Bootloader firmware doesn't implement DOWNLOAD_START or DOWNLOAD_PACKET in a non-blocking way. It will stretch the clock of the first status byte read until the operation is complete. Polling for the status is not really necessary since it will always succed on the first try. Replace polling code with a simple single byte read to simplify things. 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/20190812200906.31344-20-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.c28
1 files changed, 7 insertions, 21 deletions
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index 92df27350e41..681f65349779 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -57,11 +57,6 @@ static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
/* Received and ready for next Download packet. */
#define ZIIRAVE_FIRM_DOWNLOAD_ACK 1
-/* Currently writing to flash. Retry Download status in a moment! */
-#define ZIIRAVE_FIRM_DOWNLOAD_BUSY 2
-
-/* Wait for ACK timeout in ms */
-#define ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT 50
/* Firmware commands */
#define ZIIRAVE_CMD_DOWNLOAD_START 0x10
@@ -175,25 +170,16 @@ static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
return ret;
}
-static int ziirave_firm_wait_for_ack(struct watchdog_device *wdd)
+static int ziirave_firm_read_ack(struct watchdog_device *wdd)
{
struct i2c_client *client = to_i2c_client(wdd->parent);
int ret;
- unsigned long timeout;
-
- timeout = jiffies + msecs_to_jiffies(ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT);
- do {
- if (time_after(jiffies, timeout))
- return -ETIMEDOUT;
- usleep_range(5000, 10000);
-
- ret = i2c_smbus_read_byte(client);
- if (ret < 0) {
- dev_err(&client->dev, "Failed to read byte\n");
- return ret;
- }
- } while (ret == ZIIRAVE_FIRM_DOWNLOAD_BUSY);
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read status byte\n");
+ return ret;
+ }
return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO;
}
@@ -226,7 +212,7 @@ static int ziirave_firm_write_block_data(struct watchdog_device *wdd,
}
if (wait_for_ack)
- ret = ziirave_firm_wait_for_ack(wdd);
+ ret = ziirave_firm_read_ack(wdd);
return ret;
}