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From: Alexander Usyskin <alexander.usyskin@intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>
Cc: Tomas Winkler <tomas.winkler@intel.com>,
	Alexander Usyskin <alexander.usyskin@intel.com>,
	Vitaly Lubart <vitaly.lubart@intel.com>,
	intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] mei: gsc: setup char driver alive in spite of firmware handshake failure
Date: Wed, 15 Dec 2021 15:56:20 +0200	[thread overview]
Message-ID: <20211215135622.1060229-4-alexander.usyskin@intel.com> (raw)
In-Reply-To: <20211215135622.1060229-1-alexander.usyskin@intel.com>

Continue to char device setup in spite of firmware handshake failure.
In order to provide access to the firmware status registers and other
information are valuable for debug and manufacturing.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/gsc-me.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index 901d6e0ce6cd..c6bf869d910b 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -86,11 +86,12 @@ static int mei_gsc_probe(struct platform_device *platdev)
 	pm_runtime_set_active(device);
 	pm_runtime_enable(device);
 
-	if (mei_start(dev)) {
-		dev_err(device, "init hw failure.\n");
-		ret = -ENODEV;
-		goto err;
-	}
+	/* Continue to char device setup in spite of firmware handshake failure.
+	 * In order to provide access to the firmware status registers to the user
+	 * space via sysfs.
+	 */
+	if (mei_start(dev))
+		dev_warn(device, "init hw failure.\n");
 
 	pm_runtime_set_autosuspend_delay(device, MEI_GSC_RPM_TIMEOUT);
 	pm_runtime_use_autosuspend(device);
-- 
2.32.0


  parent reply	other threads:[~2021-12-15 13:57 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-15 13:56 [PATCH 0/5] Add driver for GSC controller Alexander Usyskin
2021-12-15 13:56 ` [PATCH 1/5] drm/i915/gsc: add gsc as a mei platform device Alexander Usyskin
2021-12-15 14:07   ` Greg Kroah-Hartman
2021-12-15 13:56 ` [PATCH 2/5] mei: add gsc driver Alexander Usyskin
2021-12-15 13:56 ` Alexander Usyskin [this message]
2021-12-15 13:56 ` [PATCH 4/5] mei: gsc: add runtime pm handlers Alexander Usyskin
2021-12-15 13:56 ` [PATCH 5/5] mei: gsc: retrieve the firmware version Alexander Usyskin

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