brcm2708: update to latest patches from RPi Foundation

[openwrt/openwrt.git] / target / linux / brcm2708 / patches-4.19 / 950-0497-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0497-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch b/target/linux/brcm2708/patches-4.19/950-0497-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch
new file mode 100644 (file)
index 0000000..164e29f
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0497-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch
@@ -0,0 +1,43 @@
+From 4a6410a53059d6505680b70fc438b7cfbf8939ca Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 3 Dec 2018 14:24:35 -0800
+Subject: [PATCH] drm/v3d: Don't bother flushing L1TD at job start.
+
+This is the write combiner for TMU writes.  You're supposed to flush
+that at job end if you had dirtied any cachelines.  Flushing it at job
+start then doesn't make any sense.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
+Reviewed-by: Dave Emett <david.emett@broadcom.com>
+Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-3-eric@anholt.net
+(cherry picked from commit 2e6dc3bd80478212e84addf1cafd6ec60674b884)
+---
+ drivers/gpu/drm/v3d/v3d_gem.c | 12 ------------
+ 1 file changed, 12 deletions(-)
+
+--- a/drivers/gpu/drm/v3d/v3d_gem.c
++++ b/drivers/gpu/drm/v3d/v3d_gem.c
+@@ -139,22 +139,10 @@ v3d_invalidate_l2(struct v3d_dev *v3d, i
+                      V3D_L2CACTL_L2CENA);
+ }
+ 
+-static void
+-v3d_invalidate_l1td(struct v3d_dev *v3d, int core)
+-{
+-      V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL, V3D_L2TCACTL_TMUWCF);
+-      if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) &
+-                     V3D_L2TCACTL_L2TFLS), 100)) {
+-              DRM_ERROR("Timeout waiting for L1T write combiner flush\n");
+-      }
+-}
+-
+ /* Invalidates texture L2 cachelines */
+ static void
+ v3d_flush_l2t(struct v3d_dev *v3d, int core)
+ {
+-      v3d_invalidate_l1td(v3d, core);
+-
+       V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL,
+                      V3D_L2TCACTL_L2TFLS |
+                      V3D_SET_FIELD(V3D_L2TCACTL_FLM_FLUSH, V3D_L2TCACTL_FLM));