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drm/rockchip: vop2: filter VP vcnt status

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VP vcnt update and read are driven by two asynchronous dclk and hclk, so add
this filtering process, otherwise may read the wrong vcnt value.

Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Change-Id: Ibe933c3b507933720222544ac695e06ad6b957dd
This commit is contained in:
Sandy Huang
2023-02-06 11:29:33 +08:00
committed by Huang Jiachai
parent 558bea7175
commit bb0ed863d8
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
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@@ -1286,8 +1286,23 @@ static bool vop2_fs_irq_is_pending(struct vop2_video_port *vp)
static uint32_t vop2_read_vcnt(struct vop2_video_port *vp)
{
uint32_t offset = RK3568_SYS_STATUS0 + (vp->id << 2);
uint32_t vcnt0, vcnt1;
int i = 0;
return vop2_readl(vp->vop2, offset) >> 16;
for (i = 0; i < 10; i++) {
vcnt0 = vop2_readl(vp->vop2, offset) >> 16;
vcnt1 = vop2_readl(vp->vop2, offset) >> 16;
if ((vcnt1 - vcnt0) <= 1)
break;
}
if (i == 10) {
DRM_DEV_ERROR(vp->vop2->dev, "read VP%d vcnt error: %d %d\n", vp->id, vcnt0, vcnt1);
vcnt1 = vop2_readl(vp->vop2, offset) >> 16;
}
return vcnt1;
}
static void vop2_wait_for_irq_handler(struct drm_crtc *crtc)