A recent change to the frame completion handling has changed the order
in which the vblank timestamps are updated.
To fix this requires handling the vblank events on the frame end event
which comes from the VSP1 driver on Gen3 instead.
Prevent the CRTC IRQ from being enabled on Gen3 hardware and handle
vblank events through the existing rcar_du_vsp_complete() callback.
The addition of this callback was to provide notification of frame
completions in the event of a race. Further extend the DU callback to
provide notification as to whether the frame was completed or not,
allowing the callback to act as a full vblank interrupt notifier.
The VSP frame end interrupt occurs approximately 50 µs earlier than the
DU frame end interrupt, but this should not cause any undue harm.
Fixes: d503a43ac06a ("drm: rcar-du: Register a completion callback with
VSP1")
Signed-off-by: Kieran Bingham
---
drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 19 ---
drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 2 ++
drivers/gpu/drm/rcar-du/rcar_du_vsp.c| 8 ++--
drivers/media/platform/vsp1/vsp1_drm.c | 5 +++--
drivers/media/platform/vsp1/vsp1_drm.h | 2 +-
drivers/media/platform/vsp1/vsp1_pipe.c | 20 ++--
drivers/media/platform/vsp1/vsp1_pipe.h | 2 +-
drivers/media/platform/vsp1/vsp1_video.c | 6 +-
include/media/vsp1.h | 2 +-
9 files changed, 45 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 9f53a8243941..e6b8eaa13419 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -621,6 +621,7 @@ static int rcar_du_crtc_enable_vblank(struct drm_crtc *crtc)
rcar_du_crtc_write(rcrtc, DSRCR, DSRCR_VBCL);
rcar_du_crtc_set(rcrtc, DIER, DIER_FRE);
+ rcrtc->vblank_enable = true;
return 0;
}
@@ -629,6 +630,7 @@ static void rcar_du_crtc_disable_vblank(struct drm_crtc
*crtc)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+ rcrtc->vblank_enable = false;
rcar_du_crtc_clr(rcrtc, DIER, DIER_FRE);
}
@@ -658,10 +660,12 @@ static irqreturn_t rcar_du_crtc_irq(int irq, void *arg)
rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
if (status & DSSR_FRM) {
+ /*
+* Gen 3 vblank and page flips are handled through the VSP
+* completion handler
+*/
drm_crtc_handle_vblank(>crtc);
-
- if (rcdu->info->gen < 3)
- rcar_du_crtc_finish_page_flip(rcrtc);
+ rcar_du_crtc_finish_page_flip(rcrtc);
ret = IRQ_HANDLED;
}
@@ -735,6 +739,15 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp,
unsigned int index)
/* Start with vertical blanking interrupt reporting disabled. */
drm_crtc_vblank_off(crtc);
+ /*
+* DU with a VSP1 source uses the VSP1 frame completion event to handle
+* vblanking and page flipping events.
+*
+* Do not register the IRQ handler in this instance.
+*/
+ if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
+ return 0;
+
/* Register the interrupt handler. */
if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
irq = platform_get_irq(pdev, index);
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
index b199ed5adf36..cf5fcc3a3418 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
@@ -31,6 +31,7 @@ struct rcar_du_vsp;
* @mmio_offset: offset of the CRTC registers in the DU MMIO block
* @index: CRTC software and hardware index
* @started: whether the CRTC has been started and is running
+ * @vblank_enable: whether vblank events are enabled on this CRTC
* @event: event to post when the pending page flip completes
* @flip_wait: wait queue used to signal page flip completion
* @outputs: bitmask of the outputs (enum rcar_du_output) driven by this CRTC
@@ -45,6 +46,7 @@ struct rcar_du_crtc {
unsigned int index;
bool started;
+ bool vblank_enable;
struct drm_pending_vblank_event *event;
wait_queue_head_t flip_wait;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
index f870445ebc8d..9144d3d50067 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
@@ -30,11 +30,15 @@
#include "rcar_du_kms.h"
#include "rcar_du_vsp.h"
-static void rcar_du_vsp_complete(void *private)
+static void rcar_du_vsp_complete(void *private, bool completed)
{
struct rcar_du_crtc *crtc = private;
- rcar_du_crtc_finish_page_flip(crtc);
+ if (crtc->vblank_enable)
+ drm_crtc_handle_vblank(>crtc);
+
+ if (completed)
+
