target/linux/brcm2708/patches-4.19/950-0575-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch

   1 From 7b8186de594a27954c909cd8a9ad1ac2cc27a526 Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Mon, 3 Dec 2018 14:24:35 -0800
   4 Subject: [PATCH 575/703] drm/v3d: Don't bother flushing L1TD at job start.
   5
   6 This is the write combiner for TMU writes.  You're supposed to flush
   7 that at job end if you had dirtied any cachelines.  Flushing it at job
   8 start then doesn't make any sense.
   9
  10 Signed-off-by: Eric Anholt <eric@anholt.net>
  11 Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
  12 Reviewed-by: Dave Emett <david.emett@broadcom.com>
  13 Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-3-eric@anholt.net
  14 (cherry picked from commit 2e6dc3bd80478212e84addf1cafd6ec60674b884)
  15 ---
  16  drivers/gpu/drm/v3d/v3d_gem.c | 12 ------------
  17  1 file changed, 12 deletions(-)
  18
  19 --- a/drivers/gpu/drm/v3d/v3d_gem.c
  20 +++ b/drivers/gpu/drm/v3d/v3d_gem.c
  21 @@ -139,22 +139,10 @@ v3d_invalidate_l2(struct v3d_dev *v3d, i
  22                        V3D_L2CACTL_L2CENA);
  23  }
  24
  25 -static void
  26 -v3d_invalidate_l1td(struct v3d_dev *v3d, int core)
  27 -{
  28 -       V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL, V3D_L2TCACTL_TMUWCF);
  29 -       if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) &
  30 -                      V3D_L2TCACTL_L2TFLS), 100)) {
  31 -               DRM_ERROR("Timeout waiting for L1T write combiner flush\n");
  32 -       }
  33 -}
  34 -
  35  /* Invalidates texture L2 cachelines */
  36  static void
  37  v3d_flush_l2t(struct v3d_dev *v3d, int core)
  38  {
  39 -       v3d_invalidate_l1td(v3d, core);
  40 -
  41         V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL,
  42                        V3D_L2TCACTL_L2TFLS |
  43                        V3D_SET_FIELD(V3D_L2TCACTL_FLM_FLUSH, V3D_L2TCACTL_FLM));