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From 561918ec5e668f9d940051737d861ee0592816f6 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Fri, 29 Mar 2019 12:04:36 -0700
Subject: [PATCH] drm/vc4: Make sure that vblank waits work without v3d
loaded.
This flag exists to protect legacy drivers, but when vc4's v3d doesn't
probe, it doesn't get set up by vc4_v3d.c's call of drm_irq_install.
This resulted in applications running as fast as possible, and laggy
performance from compton as it had to wait for the latest rendering by
the application for its presentation.
Signed-off-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/vc4/vc4_kms.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -422,6 +422,7 @@ int vc4_kms_load(struct drm_device *dev)
/* Set support for vblank irq fast disable, before drm_vblank_init() */
dev->vblank_disable_immediate = true;
+ dev->irq_enabled = true;
ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
if (ret < 0) {
dev_err(dev->dev, "failed to initialize vblank\n");
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