linux-kernel - [char-misc-next] mei: me: enable asynchronous probing

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Message-Id: <20170629064002.27750-1-tomas.winkler@intel.com>
Date:   Thu, 29 Jun 2017 09:40:02 +0300
From:   Tomas Winkler <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next] mei: me: enable asynchronous probing

From: Alexander Usyskin <alexander.usyskin@...el.com>

On some platforms, currently Broxton, Apollo Lake and Kaby Lake,
ME FW may be busy with internal bookkeeping and answering late
to the start message.
As a mitigation, the driver requests for a synchronous probing
to prevent stalling of the overall boot process. For example,
on a Apollo Lake platform the overall boot time has reduced from
~0.9 to ~0.6 seconds on average.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/pci-me.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index abaa2c485f40..3f4e36b8892f 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -489,6 +489,7 @@ static struct pci_driver mei_me_driver = {
 	.remove = mei_me_remove,
 	.shutdown = mei_me_shutdown,
 	.driver.pm = MEI_ME_PM_OPS,
+	.driver.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 };
 
 module_pci_driver(mei_me_driver);
-- 
2.9.4