From: zain wang wzz@rock-chips.com
Add a lock to vop to avoid disabling the crtc while waiting for a line flag while enabling psr. If we disable in the middle of waiting for the line flag, we'll end up timing out or worse.
Signed-off-by: zain wang wzz@rock-chips.com Signed-off-by: Sean Paul seanpaul@chromium.org Signed-off-by: Thierry Escande thierry.escande@collabora.com --- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 30 +++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index 31304434847a..bf4b1a2f3fa4 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -117,6 +117,8 @@ struct vop { spinlock_t reg_lock; /* lock vop irq reg */ spinlock_t irq_lock; + /* protects crtc enable/disable */ + struct mutex vop_lock;
unsigned int irq;
@@ -577,6 +579,7 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc,
WARN_ON(vop->event);
+ mutex_lock(&vop->vop_lock); drm_crtc_vblank_off(crtc);
/* @@ -612,6 +615,7 @@ static void vop_crtc_atomic_disable(struct drm_crtc *crtc, clk_disable(vop->aclk); clk_disable(vop->hclk); pm_runtime_put(vop->dev); + mutex_unlock(&vop->vop_lock);
if (crtc->state->event && !crtc->state->active) { spin_lock_irq(&crtc->dev->event_lock); @@ -882,10 +886,13 @@ static void vop_crtc_atomic_enable(struct drm_crtc *crtc, uint32_t pin_pol, val; int ret;
+ mutex_lock(&vop->vop_lock); + WARN_ON(vop->event);
ret = vop_enable(crtc); if (ret) { + mutex_unlock(&vop->vop_lock); DRM_DEV_ERROR(vop->dev, "Failed to enable vop (%d)\n", ret); return; } @@ -949,6 +956,7 @@ static void vop_crtc_atomic_enable(struct drm_crtc *crtc, clk_set_rate(vop->dclk, adjusted_mode->clock * 1000);
VOP_REG_SET(vop, common, standby, 0); + mutex_unlock(&vop->vop_lock); }
static bool vop_fs_irq_is_pending(struct vop *vop) @@ -1487,15 +1495,21 @@ int rockchip_drm_wait_vact_end(struct drm_crtc *crtc, unsigned int mstimeout) { struct vop *vop = to_vop(crtc); unsigned long jiffies_left; + int ret = 0;
if (!crtc || !vop->is_enabled) return -ENODEV;
- if (mstimeout <= 0) - return -EINVAL; + mutex_lock(&vop->vop_lock); + if (mstimeout <= 0) { + ret = -EINVAL; + goto out; + }
- if (vop_line_flag_irq_is_enabled(vop)) - return -EBUSY; + if (vop_line_flag_irq_is_enabled(vop)) { + ret = -EBUSY; + goto out; + }
reinit_completion(&vop->line_flag_completion); vop_line_flag_irq_enable(vop); @@ -1506,10 +1520,13 @@ int rockchip_drm_wait_vact_end(struct drm_crtc *crtc, unsigned int mstimeout)
if (jiffies_left == 0) { DRM_DEV_ERROR(vop->dev, "Timeout waiting for IRQ\n"); - return -ETIMEDOUT; + ret = -ETIMEDOUT; + goto out; }
- return 0; +out: + mutex_unlock(&vop->vop_lock); + return ret; } EXPORT_SYMBOL(rockchip_drm_wait_vact_end);
@@ -1559,6 +1576,7 @@ static int vop_bind(struct device *dev, struct device *master, void *data)
spin_lock_init(&vop->reg_lock); spin_lock_init(&vop->irq_lock); + mutex_init(&vop->vop_lock);
ret = devm_request_irq(dev, vop->irq, vop_isr, IRQF_SHARED, dev_name(dev), vop);