diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0497-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0497-drm-v3d-Don-t-bother-flushing-L1TD-at-job-start.patch | 43 |
1 files changed, 43 insertions, 0 deletions
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 index 0000000000..164e29f673 --- /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)); |