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46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
From c0041a9fe33d6031267d9f3e2372833908e97337 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Tue, 2 Apr 2019 13:29:00 -0700
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Subject: [PATCH] drm/vc4: Fix vblank timestamping for firmwarekms.
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The core doesn't expect a false return from the scanoutpos function in
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normal usage, so we were doing the precise vblank timestamping path
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and thus "immediate" vblank disables (even though firmwarekms can't
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actually disable vblanks interrupts, sigh), and the kernel would get
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confused when getting timestamp info when also turning vblanks back
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on.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 3 ---
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drivers/gpu/drm/vc4/vc4_firmware_kms.c | 6 ++++++
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2 files changed, 6 insertions(+), 3 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_crtc.c
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+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
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@@ -133,9 +133,6 @@ bool vc4_crtc_get_scanoutpos(struct drm_
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int vblank_lines;
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bool ret = false;
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- if (vc4->firmware_kms)
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- return 0;
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-
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/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
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/* Get optional system timestamp before query. */
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--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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@@ -673,6 +673,12 @@ static int vc4_fkms_bind(struct device *
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vc4->firmware_kms = true;
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+ /* firmware kms doesn't have precise a scanoutpos implementation, so
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+ * we can't do the precise vblank timestamp mode.
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+ */
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+ drm->driver->get_scanout_position = NULL;
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+ drm->driver->get_vblank_timestamp = NULL;
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+
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vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
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if (!vc4_crtc)
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return -ENOMEM;
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