2019-09-19 14:43:19 +00:00
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From 9d8fa62500ae52348d36766e70b49c7508addaf3 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 3 Dec 2018 14:24:36 -0800
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] drm/v3d: Drop the wait for L2T flush to complete.
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2019-07-09 18:32:28 +00:00
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According to Dave, once you've started an L2T flush, all L2T accesses
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will be blocked until the flush completes. This fixes a consistent
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3-4ms stall between the ioctl and running the job, and 3DMMES Taiji
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goes from 27fps to 110fps.
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v2: Leave a note about why we don't need to wait for completion.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
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Reviewed-by: Dave Emett <david.emett@broadcom.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/20181203222438.25417-4-eric@anholt.net
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(cherry picked from commit 51c1b6f9eb3dbdec91b0e3c89f623e634c996bbb)
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---
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drivers/gpu/drm/v3d/v3d_gem.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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--- a/drivers/gpu/drm/v3d/v3d_gem.c
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+++ b/drivers/gpu/drm/v3d/v3d_gem.c
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@@ -143,13 +143,13 @@ v3d_invalidate_l2(struct v3d_dev *v3d, i
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static void
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v3d_flush_l2t(struct v3d_dev *v3d, int core)
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{
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+ /* While there is a busy bit (V3D_L2TCACTL_L2TFLS), we don't
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+ * need to wait for completion before dispatching the job --
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+ * L2T accesses will be stalled until the flush has completed.
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+ */
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V3D_CORE_WRITE(core, V3D_CTL_L2TCACTL,
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V3D_L2TCACTL_L2TFLS |
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V3D_SET_FIELD(V3D_L2TCACTL_FLM_FLUSH, V3D_L2TCACTL_FLM));
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- if (wait_for(!(V3D_CORE_READ(core, V3D_CTL_L2TCACTL) &
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- V3D_L2TCACTL_L2TFLS), 100)) {
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- DRM_ERROR("Timeout waiting for L2T flush\n");
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- }
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}
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/* Invalidates the slice caches. These are read-only caches. */
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