linux-kernel - [PATCH 2/2] habanalabs: do not halt Coresight during hard reset

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Date:   Sun, 5 Jan 2020 09:05:45 +0000
From:   Omer Shpigelman <oshpigelman@...ana.ai>
To:     "oded.gabbay@...il.com" <oded.gabbay@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] habanalabs: do not halt Coresight during hard reset

During hard reset we must not write to the device.
Hence avoid halting Coresight during user context close if it is done
during hard reset.
In addition, we must not reenable clock gating afterwards as it was
deliberately disabled in the beginning of the hard reset flow.

Signed-off-by: Omer Shpigelman <oshpigelman@...ana.ai>
---
 drivers/misc/habanalabs/device.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/device.c b/drivers/misc/habanalabs/device.c
index 166883b64725..b680b0caa69b 100644
--- a/drivers/misc/habanalabs/device.c
+++ b/drivers/misc/habanalabs/device.c
@@ -598,7 +598,9 @@ int hl_device_set_debug_mode(struct hl_device *hdev, bool enable)
 			goto out;
 		}
 
-		hdev->asic_funcs->halt_coresight(hdev);
+		if (!hdev->hard_reset_pending)
+			hdev->asic_funcs->halt_coresight(hdev);
+
 		hdev->in_debug = 0;
 
 		goto out;
-- 
2.17.1