vc4: hopefully improve the vblank crash issues
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Peter Robinson
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5513471805
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e782766072
165
bcm283x-vc4-fix-vblank.patch
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165
bcm283x-vc4-fix-vblank.patch
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From e487709ee89a572a3a8068f33e9275479fde9bf4 Mon Sep 17 00:00:00 2001
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From: Boris Brezillon <boris.brezillon@free-electrons.com>
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Date: Fri, 16 Jun 2017 10:30:33 +0200
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Subject: [PATCH 1/2] drm/vc4: Send a VBLANK event when disabling a CRTC
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VBLANK events are missed when the CRTC is being disabled because the
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driver does not wait till the end of the frame before stopping the
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HVS and PV blocks. In this case, we should explicitly issue a VBLANK
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event if there's one waiting.
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
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index 9fcf05ca492b..66cffc548af2 100644
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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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@@ -526,6 +526,19 @@ static void vc4_crtc_disable(struct drm_crtc *crtc)
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WARN_ON_ONCE((HVS_READ(SCALER_DISPSTATX(chan)) &
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(SCALER_DISPSTATX_FULL | SCALER_DISPSTATX_EMPTY)) !=
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SCALER_DISPSTATX_EMPTY);
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+
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+ /*
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+ * Make sure we issue a vblank event after disabling the CRTC if
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+ * someone was waiting it.
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+ */
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+ if (crtc->state->event) {
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&dev->event_lock, flags);
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+ drm_crtc_send_vblank_event(crtc, crtc->state->event);
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+ crtc->state->event = NULL;
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+ spin_unlock_irqrestore(&dev->event_lock, flags);
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+ }
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}
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static void vc4_crtc_enable(struct drm_crtc *crtc)
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--
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2.13.0
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From 6c9d1ad4c10657d7d6f8455088686abee1805102 Mon Sep 17 00:00:00 2001
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From: Peter Robinson <pbrobinson@gmail.com>
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Date: Mon, 26 Jun 2017 09:03:28 +0100
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Subject: [PATCH 2/2] drm/vc4: Fix VBLANK handling in crtc->enable() path
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When we are enabling a CRTC, drm_crtc_vblank_get() is called before
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drm_crtc_vblank_on(), which is not supposed to happen (hence the
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WARN_ON() in the code). To solve the problem, we delay the 'update
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display list' operation after the CRTC is actually enabled.
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 66 +++++++++++++++++++++++++++---------------
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1 file changed, 43 insertions(+), 23 deletions(-)
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diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
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index 66cffc548af2..47a8ef0a755d 100644
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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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@@ -541,6 +541,34 @@ static void vc4_crtc_disable(struct drm_crtc *crtc)
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}
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}
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+static void vc4_crtc_update_dlist(struct drm_crtc *crtc)
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+{
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+ struct drm_device *dev = crtc->dev;
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+ struct vc4_dev *vc4 = to_vc4_dev(dev);
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+ struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
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+ struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
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+
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+ if (crtc->state->event) {
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+ unsigned long flags;
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+
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+ crtc->state->event->pipe = drm_crtc_index(crtc);
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+
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+ WARN_ON(drm_crtc_vblank_get(crtc) != 0);
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+
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+ spin_lock_irqsave(&dev->event_lock, flags);
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+ vc4_crtc->event = crtc->state->event;
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+ crtc->state->event = NULL;
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+
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+ HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
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+ vc4_state->mm.start);
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+
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+ spin_unlock_irqrestore(&dev->event_lock, flags);
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+ } else {
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+ HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
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+ vc4_state->mm.start);
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+ }
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+}
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+
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static void vc4_crtc_enable(struct drm_crtc *crtc)
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{
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struct drm_device *dev = crtc->dev;
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@@ -551,6 +579,12 @@ static void vc4_crtc_enable(struct drm_crtc *crtc)
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require_hvs_enabled(dev);
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+ /* Enable vblank irq handling before crtc is started otherwise
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+ * drm_crtc_get_vblank() fails in vc4_crtc_update_dlist().
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+ */
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+ drm_crtc_vblank_on(crtc);
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+ vc4_crtc_update_dlist(crtc);
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+
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/* Turn on the scaler, which will wait for vstart to start
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* compositing.
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*/
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@@ -562,9 +596,6 @@ static void vc4_crtc_enable(struct drm_crtc *crtc)
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/* Turn on the pixel valve, which will emit the vstart signal. */
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CRTC_WRITE(PV_V_CONTROL,
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CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
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-
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- /* Enable vblank irq handling after crtc is started. */
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- drm_crtc_vblank_on(crtc);
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}
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static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
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@@ -619,7 +650,6 @@ static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
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{
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struct drm_device *dev = crtc->dev;
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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- struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
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struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
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struct drm_plane *plane;
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bool debug_dump_regs = false;
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@@ -641,25 +671,15 @@ static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
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WARN_ON_ONCE(dlist_next - dlist_start != vc4_state->mm.size);
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- if (crtc->state->event) {
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- unsigned long flags;
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-
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- crtc->state->event->pipe = drm_crtc_index(crtc);
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-
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- WARN_ON(drm_crtc_vblank_get(crtc) != 0);
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-
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- spin_lock_irqsave(&dev->event_lock, flags);
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- vc4_crtc->event = crtc->state->event;
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- crtc->state->event = NULL;
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-
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- HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
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- vc4_state->mm.start);
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-
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- spin_unlock_irqrestore(&dev->event_lock, flags);
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- } else {
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- HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
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- vc4_state->mm.start);
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- }
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+ /* Only update DISPLIST if the CRTC was already running and is not
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+ * being disabled.
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+ * vc4_crtc_enable() takes care of updating the dlist just after
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+ * re-enabling VBLANK interrupts and before enabling the engine.
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+ * If the CRTC is being disabled, there's no point in updating this
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+ * information.
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+ */
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+ if (crtc->state->active && old_state->active)
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+ vc4_crtc_update_dlist(crtc);
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if (debug_dump_regs) {
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DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
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--
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2.13.0
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@ -605,6 +605,10 @@ Patch312: arm64-Add-option-of-13-for-FORCE_MAX_ZONEORDER.patch
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Patch313: bcm2835-clk-audio-jitter-issues.patch
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Patch314: bcm2835-fix-potential-null-pointer-dereferences.patch
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# https://patchwork.freedesktop.org/patch/163300/
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# https://patchwork.freedesktop.org/patch/161978/
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Patch315: bcm283x-vc4-fix-vblank.patch
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# 400 - IBM (ppc/s390x) patches
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# 500 - Temp fixes/CVEs etc
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@ -2189,6 +2193,9 @@ fi
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#
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#
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%changelog
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* Mon Jun 26 2017 Peter Robinson <pbrobinson@fedoraproject.org>
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- vc4: hopefully improve the vblank crash issues
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* Fri Jun 23 2017 Hans de Goede <jwrdegoede@fedoraproject.org>
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- Enable AXP288 PMIC support on x86_64 for battery charging and monitoring
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support on Bay and Cherry Trail tablets and laptops
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