linux-kernel - [PATCH 5.4 020/168] habanalabs: do not halt CoreSight during hard reset

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Date:   Tue, 10 Mar 2020 13:37:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Omer Shpigelman <oshpigelman@...ana.ai>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 020/168] habanalabs: do not halt CoreSight during hard reset

From: Omer Shpigelman <oshpigelman@...ana.ai>

[ Upstream commit a37e47192dfa98f79a0cd5ab991c224b5980c982 ]

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 re-enable clock gating afterwards as it was
deliberately disabled in the beginning of the hard reset flow.

Signed-off-by: Omer Shpigelman <oshpigelman@...ana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 eb9c07833a517..a7a4fed4d8995 100644
--- a/drivers/misc/habanalabs/device.c
+++ b/drivers/misc/habanalabs/device.c
@@ -600,7 +600,9 @@ 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;
-- 
2.20.1