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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: [PATCH 4.16 075/196] thunderbolt: Wait a bit longer for ICM to authenticate the active NVM
Date:   Sun, 22 Apr 2018 15:51:35 +0200
Message-Id: <20180422135108.112426632@linuxfoundation.org>
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4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mika Westerberg <mika.westerberg@linux.intel.com>

commit e4be8c9b6a512e274cb6bbac4ac869d73880a8b3 upstream.

Sometimes during cold boot ICM has not yet authenticated the active NVM
image leading to timeout and failing the driver probe. Allow ICM to take
some more time and increase the timeout to 3 seconds before we give up.

While there fix icm_firmware_init() to return the real error code
without overwriting it with -ENODEV.

Fixes: f67cf491175a ("thunderbolt: Add support for Internal Connection Manager (ICM)")
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/thunderbolt/icm.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/thunderbolt/icm.c
+++ b/drivers/thunderbolt/icm.c
@@ -728,14 +728,14 @@ static bool icm_ar_is_supported(struct t
 static int icm_ar_get_mode(struct tb *tb)
 {
 	struct tb_nhi *nhi = tb->nhi;
-	int retries = 5;
+	int retries = 60;
 	u32 val;
 
 	do {
 		val = ioread32(nhi->iobase + REG_FW_STS);
 		if (val & REG_FW_STS_NVM_AUTH_DONE)
 			break;
-		msleep(30);
+		msleep(50);
 	} while (--retries);
 
 	if (!retries) {
@@ -1054,6 +1054,9 @@ static int icm_firmware_init(struct tb *
 			break;
 
 		default:
+			if (ret < 0)
+				return ret;
+
 			tb_err(tb, "ICM firmware is in wrong mode: %u\n", ret);
 			return -ENODEV;
 		}