forked from Minki/linux
5e0594fd77
The driver recently switched from handling page flip completion in the
DU vertical blanking handler to the VSP frame end handler to fix a race
condition. This unfortunately resulted in incorrect timestamps in the
vertical blanking events sent to userspace as vertical blanking is now
handled after sending the event.
To fix this we must reverse the order of the two operations. The easiest
way is to handle vertical blanking in the VSP frame end handler before
sending the event. The VSP frame end interrupt occurs approximately 50µs
earlier than the DU frame end interrupt, but this should not cause any
undue harm.
As we need to handle vertical blanking even when page flip completion is
delayed, the VSP driver now needs to call the frame end completion
callback unconditionally, with a new argument to report whether page
flip has completed.
With this new scheme the DU vertical blanking interrupt isn't needed
anymore, so we can stop enabling it.
Fixes: d503a43ac0 ("drm: rcar-du: Register a completion callback with VSP1")
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* rcar_du_crtc.h -- R-Car Display Unit CRTCs
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*
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* Copyright (C) 2013-2015 Renesas Electronics Corporation
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*
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* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __RCAR_DU_CRTC_H__
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#define __RCAR_DU_CRTC_H__
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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struct rcar_du_group;
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struct rcar_du_vsp;
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/**
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* struct rcar_du_crtc - the CRTC, representing a DU superposition processor
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* @crtc: base DRM CRTC
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* @clock: the CRTC functional clock
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* @extclock: external pixel dot clock (optional)
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* @mmio_offset: offset of the CRTC registers in the DU MMIO block
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* @index: CRTC software and hardware index
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* @initialized: whether the CRTC has been initialized and clocks enabled
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* @vblank_enable: whether vblank events are enabled on this CRTC
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* @event: event to post when the pending page flip completes
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* @flip_wait: wait queue used to signal page flip completion
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* @vblank_lock: protects vblank_wait and vblank_count
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* @vblank_wait: wait queue used to signal vertical blanking
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* @vblank_count: number of vertical blanking interrupts to wait for
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* @outputs: bitmask of the outputs (enum rcar_du_output) driven by this CRTC
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* @group: CRTC group this CRTC belongs to
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* @vsp: VSP feeding video to this CRTC
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* @vsp_pipe: index of the VSP pipeline feeding video to this CRTC
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*/
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struct rcar_du_crtc {
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struct drm_crtc crtc;
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struct clk *clock;
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struct clk *extclock;
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unsigned int mmio_offset;
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unsigned int index;
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bool initialized;
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bool vblank_enable;
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struct drm_pending_vblank_event *event;
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wait_queue_head_t flip_wait;
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spinlock_t vblank_lock;
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wait_queue_head_t vblank_wait;
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unsigned int vblank_count;
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unsigned int outputs;
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struct rcar_du_group *group;
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struct rcar_du_vsp *vsp;
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unsigned int vsp_pipe;
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};
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#define to_rcar_crtc(c) container_of(c, struct rcar_du_crtc, crtc)
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enum rcar_du_output {
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RCAR_DU_OUTPUT_DPAD0,
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RCAR_DU_OUTPUT_DPAD1,
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RCAR_DU_OUTPUT_LVDS0,
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RCAR_DU_OUTPUT_LVDS1,
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RCAR_DU_OUTPUT_HDMI0,
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RCAR_DU_OUTPUT_HDMI1,
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RCAR_DU_OUTPUT_TCON,
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RCAR_DU_OUTPUT_MAX,
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};
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int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int index);
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void rcar_du_crtc_suspend(struct rcar_du_crtc *rcrtc);
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void rcar_du_crtc_resume(struct rcar_du_crtc *rcrtc);
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void rcar_du_crtc_route_output(struct drm_crtc *crtc,
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enum rcar_du_output output);
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void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc);
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#endif /* __RCAR_DU_CRTC_H__ */
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