[PATCH v2 5/9] drm/panfrost: Add HW_ISSUE_TTRX_3485 quirk

From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
To: dri-devel@lists.freedesktop.org
Cc: "Nícolas F . R . A . Prado" <nfraprado@collabora.com>,
	"Tomeu Vizoso" <tomeu.vizoso@collabora.com>,
	"David Airlie" <airlied@linux.ie>,
	linux-kernel@vger.kernel.org,
	"Steven Price" <steven.price@arm.com>,
	"Alyssa Rosenzweig" <alyssa.rosenzweig@collabora.com>,
	"AngeloGioacchino Del Regno"
	<angelogioacchino.delregno@collabora.com>
Subject: [PATCH v2 5/9] drm/panfrost: Add HW_ISSUE_TTRX_3485 quirk
Date: Wed, 25 May 2022 10:57:50 -0400	[thread overview]
Message-ID: <20220525145754.25866-6-alyssa.rosenzweig@collabora.com> (raw)
In-Reply-To: <20220525145754.25866-1-alyssa.rosenzweig@collabora.com>

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@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.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

