[PATCH 1/4] drm: Add a firmware flash method to device wedged uevent

[Riana Tauro]

A device is declared wedged when it is non-recoverable from
the driver context. Some firmware errors can also cause
the device to enter this state and the only method to recover
from this would be to do a firmware flash

Signed-off-by: Riana Tauro <riana.tauro at intel.com>
---
 Documentation/gpu/drm-uapi.rst | 6 +++---
 drivers/gpu/drm/drm_drv.c      | 2 ++
 include/drm/drm_device.h       | 1 +
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
index 4863a4deb0ee..524224afb09f 100644
--- a/Documentation/gpu/drm-uapi.rst
+++ b/Documentation/gpu/drm-uapi.rst
@@ -422,9 +422,8 @@ Current implementation defines three recovery methods, out of which, drivers
 can use any one, multiple or none. Method(s) of choice will be sent in the
 uevent environment as ``WEDGED=<method1>[,..,<methodN>]`` in order of less to
 more side-effects. If driver is unsure about recovery or method is unknown
-(like soft/hard system reboot, firmware flashing, physical device replacement
-or any other procedure which can't be attempted on the fly), ``WEDGED=unknown``
-will be sent instead.
+(like soft/hard system reboot, physical device replacement or any other procedure
+which can't be attempted on the fly), ``WEDGED=unknown`` will be sent instead.
 
 Userspace consumers can parse this event and attempt recovery as per the
 following expectations.
@@ -435,6 +434,7 @@ following expectations.
     none            optional telemetry collection
     rebind          unbind + bind driver
     bus-reset       unbind + bus reset/re-enumeration + bind
+    firmware-flash  unbind + firmware flash + bind
     unknown         consumer policy
     =============== ========================================
 
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 56dd61f8e05a..e287424db753 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -533,6 +533,8 @@ static const char *drm_get_wedge_recovery(unsigned int opt)
 		return "rebind";
 	case DRM_WEDGE_RECOVERY_BUS_RESET:
 		return "bus-reset";
+	case DRM_WEDGE_RECOVERY_FW_FLASH:
+		return "firmware-flash";
 	default:
 		return NULL;
 	}
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
index e2f894f1b90a..e446e40f8306 100644
--- a/include/drm/drm_device.h
+++ b/include/drm/drm_device.h
@@ -29,6 +29,7 @@ struct pci_controller;
 #define DRM_WEDGE_RECOVERY_NONE		BIT(0)	/* optional telemetry collection */
 #define DRM_WEDGE_RECOVERY_REBIND	BIT(1)	/* unbind + bind driver */
 #define DRM_WEDGE_RECOVERY_BUS_RESET	BIT(2)	/* unbind + reset bus device + bind */
+#define DRM_WEDGE_RECOVERY_FW_FLASH	BIT(3)  /* unbind + firmware flash + bind */
 
 /**
  * enum switch_power_state - power state of drm device
-- 
2.47.1