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drm/vc4: Report HVS underrun errors

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Add a debugfs entry and helper for reporting HVS underrun errors as
well as helpers for masking and unmasking the underrun interrupts.
Add an IRQ handler and initial IRQ configuration.
Rework related register definitions to take the channel number.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190220155124.25022-2-paul.kocialkowski@bootlin.com
This commit is contained in:
Boris Brezillon
2019-02-20 16:51:22 +01:00
committed by Maxime Ripard
parent dbfbe717cc
commit 531a1b622d
6 changed files with 140 additions and 35 deletions
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8
drivers/gpu/drm/vc4/vc4_crtc.c
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@@ -834,6 +834,14 @@ static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)
drm_crtc_send_vblank_event(crtc, vc4_crtc->event);
vc4_crtc->event = NULL;
drm_crtc_vblank_put(crtc);
/* Wait for the page flip to unmask the underrun to ensure that
* the display list was updated by the hardware. Before that
* happens, the HVS will be using the previous display list with
* the CRTC and encoder already reconfigured, leading to
* underruns. This can be seen when reconfiguring the CRTC.
*/
vc4_hvs_unmask_underrun(dev, vc4_crtc->channel);
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}