linux-kernel - [PATCH v2 5/9] drm/panfrost: Add HW_ISSUE_TTRX

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Date:   Wed, 25 May 2022 10:57:50 -0400
From:   Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/9] drm/panfrost: Add HW_ISSUE_TTRX_3485 quirk

TTRX_3485 requires the infamous "dummy job" workaround. I have this
workaround implemented in a local branch, but I have not yet hit a case
that requires it so I cannot test whether the implementation is correct.
In the mean time, add the quirk bit so we can document which platforms
may need it in the future.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Reviewed-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/panfrost/panfrost_issues.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_issues.h b/drivers/gpu/drm/panfrost/panfrost_issues.h
index e35807e4b743..4d41e0a13867 100644
--- a/drivers/gpu/drm/panfrost/panfrost_issues.h
+++ b/drivers/gpu/drm/panfrost/panfrost_issues.h
@@ -132,6 +132,9 @@ enum panfrost_hw_issue {
 	 * to hang */
 	HW_ISSUE_TTRX_3076,
 
+	/* Must issue a dummy job before starting real work to prevent hangs */
+	HW_ISSUE_TTRX_3485,
+
 	HW_ISSUE_END
 };
 
-- 
2.35.1