linux-kernel - [PATCH v2 5/6] drm/v3d: Stop trying to flush L2C on V3D 3.3+

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Message-Id: <20181203222438.25417-5-eric@anholt.net>
Date:   Mon,  3 Dec 2018 14:24:37 -0800
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        Dave Emett <david.emett@...adcom.com>,
        Thomas Spurden <thomas.spurden@...adcom.com>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH v2 5/6] drm/v3d: Stop trying to flush L2C on V3D 3.3+

This cache was replaced with the slice accessing the L2T in the newer
generations.  Noted by Dave during review.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index c268c7c79566..8a4be9515179 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -130,10 +130,15 @@ v3d_flush_l3(struct v3d_dev *v3d)
 	}
 }
 
-/* Invalidates the (read-only) L2 cache. */
+/* Invalidates the (read-only) L2C cache.  This was the L2 cache for
+ * uniforms and instructions on V3D 3.2.
+ */
 static void
-v3d_invalidate_l2(struct v3d_dev *v3d, int core)
+v3d_invalidate_l2c(struct v3d_dev *v3d, int core)
 {
+	if (v3d->ver > 32)
+		return;
+
 	V3D_CORE_WRITE(core, V3D_CTL_L2CACTL,
 		       V3D_L2CACTL_L2CCLR |
 		       V3D_L2CACTL_L2CENA);
@@ -168,7 +173,7 @@ v3d_invalidate_caches(struct v3d_dev *v3d)
 {
 	v3d_flush_l3(v3d);
 
-	v3d_invalidate_l2(v3d, 0);
+	v3d_invalidate_l2c(v3d, 0);
 	v3d_invalidate_slices(v3d, 0);
 	v3d_flush_l2t(v3d, 0);
 }
-- 
2.20.0.rc1