linux-kernel - [PATCH 03/20] mei: gsc: setup char driver alive in spite of firmware handshake failure

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Message-Id: <20220407125839.1479249-4-alexander.usyskin@intel.com>
Date:   Thu,  7 Apr 2022 15:58:22 +0300
From:   Alexander Usyskin <alexander.usyskin@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc:     Tomas Winkler <tomas.winkler@...el.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        Vitaly Lubart <vitaly.lubart@...el.com>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>
Subject: [PATCH 03/20] mei: gsc: setup char driver alive in spite of firmware handshake failure

Setup char device in spite of firmware handshake failure.
In order to provide host access to the firmware status registers and other
information required for the manufacturing process.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>
---
 drivers/misc/mei/gsc-me.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
index 64b02adf3149..58e39c00f150 100644
--- a/drivers/misc/mei/gsc-me.c
+++ b/drivers/misc/mei/gsc-me.c
@@ -79,11 +79,12 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 	pm_runtime_set_active(device);
 	pm_runtime_enable(device);
 
-	if (mei_start(dev)) {
-		dev_err(device, "init hw failure.\n");
-		ret = -ENODEV;
-		goto irq_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);
@@ -97,7 +98,6 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev,
 
 register_err:
 	mei_stop(dev);
-irq_err:
 	devm_free_irq(device, hw->irq, dev);
 
 err:
-- 
2.32.0