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Message-Id: <1436561506-13328-1-git-send-email-hali@codeaurora.org>
Date: Fri, 10 Jul 2015 16:51:46 -0400
From: Hai Li <hali@...eaurora.org>
To: dri-devel@...ts.freedesktop.org
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
robdclark@...il.com, Hai Li <hali@...eaurora.org>
Subject: [PATCH] drm/msm: Enable clocks during enable/disable_vblank() callbacks
AHB clock should be enabled before accessing registers during
enable/disable_vblank(). Since these 2 callbacks are called in
atomic context while clk_prepare may cause thread sleep, a work
is scheduled to control vblanks.
Signed-off-by: Hai Li <hali@...eaurora.org>
---
drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c | 9 ++++
drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c | 9 ++++
drivers/gpu/drm/msm/msm_drv.c | 73 ++++++++++++++++++++++++++++++++-
drivers/gpu/drm/msm/msm_drv.h | 8 ++++
4 files changed, 97 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
index 7369ee7f..64d24fc 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
@@ -86,13 +86,22 @@ irqreturn_t mdp4_irq(struct msm_kms *kms)
int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{
+ struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+
+ mdp4_enable(mdp4_kms);
mdp_update_vblank_mask(to_mdp_kms(kms),
mdp4_crtc_vblank(crtc), true);
+ mdp4_disable(mdp4_kms);
+
return 0;
}
void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{
+ struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+
+ mdp4_enable(mdp4_kms);
mdp_update_vblank_mask(to_mdp_kms(kms),
mdp4_crtc_vblank(crtc), false);
+ mdp4_disable(mdp4_kms);
}
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
index 33bd4c6..2a578f2 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
@@ -112,15 +112,24 @@ irqreturn_t mdp5_irq(struct msm_kms *kms)
int mdp5_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{
+ struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+
+ mdp5_enable(mdp5_kms);
mdp_update_vblank_mask(to_mdp_kms(kms),
mdp5_crtc_vblank(crtc), true);
+ mdp5_disable(mdp5_kms);
+
return 0;
}
void mdp5_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{
+ struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+
+ mdp5_enable(mdp5_kms);
mdp_update_vblank_mask(to_mdp_kms(kms),
mdp5_crtc_vblank(crtc), false);
+ mdp5_disable(mdp5_kms);
}
/*
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index b7ef56e..5265933 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -116,6 +116,65 @@ u32 msm_readl(const void __iomem *addr)
return val;
}
+struct vblank_event {
+ struct list_head node;
+ int crtc_id;
+ bool enable;
+};
+
+static void vblank_ctrl_worker(struct work_struct *work)
+{
+ struct msm_vblank_ctrl *vbl_ctrl = container_of(work,
+ struct msm_vblank_ctrl, work);
+ struct msm_drm_private *priv = container_of(vbl_ctrl,
+ struct msm_drm_private, vblank_ctrl);
+ struct msm_kms *kms = priv->kms;
+ struct vblank_event *vbl_ev, *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vbl_ctrl->lock, flags);
+ list_for_each_entry_safe(vbl_ev, tmp, &vbl_ctrl->event_list, node) {
+ list_del(&vbl_ev->node);
+ spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
+
+ if (vbl_ev->enable)
+ kms->funcs->enable_vblank(kms,
+ priv->crtcs[vbl_ev->crtc_id]);
+ else
+ kms->funcs->disable_vblank(kms,
+ priv->crtcs[vbl_ev->crtc_id]);
+
+ kfree(vbl_ev);
+
+ spin_lock_irqsave(&vbl_ctrl->lock, flags);
+ }
+
+ spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
+}
+
+static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
+ int crtc_id, bool enable)
+{
+ struct msm_vblank_ctrl *vbl_ctrl = &priv->vblank_ctrl;
+ struct vblank_event *vbl_ev;
+ unsigned long flags;
+
+ vbl_ev = kzalloc(sizeof(*vbl_ev), GFP_ATOMIC);
+ if (!vbl_ev)
+ return -ENOMEM;
+
+ vbl_ev->crtc_id = crtc_id;
+ vbl_ev->enable = enable;
+
+ spin_lock_irqsave(&vbl_ctrl->lock, flags);
+ list_add_tail(&vbl_ev->node, &vbl_ctrl->event_list);
+ spin_unlock_irqrestore(&vbl_ctrl->lock, flags);
+
+ queue_work(priv->wq, &vbl_ctrl->work);
+
+ return 0;
+}
+
/*
* DRM operations:
*/
@@ -125,6 +184,14 @@ static int msm_unload(struct drm_device *dev)
struct msm_drm_private *priv = dev->dev_private;
struct msm_kms *kms = priv->kms;
struct msm_gpu *gpu = priv->gpu;
+ struct msm_vblank_ctrl *vbl_ctrl = &priv->vblank_ctrl;
+ struct vblank_event *vbl_ev, *tmp;
+
+ cancel_work_sync(&vbl_ctrl->work);
+ list_for_each_entry_safe(vbl_ev, tmp, &vbl_ctrl->event_list, node) {
+ list_del(&vbl_ev->node);
+ kfree(vbl_ev);
+ }
drm_kms_helper_poll_fini(dev);
drm_mode_config_cleanup(dev);
@@ -282,6 +349,8 @@ static int msm_load(struct drm_device *dev, unsigned long flags)
INIT_LIST_HEAD(&priv->inactive_list);
INIT_LIST_HEAD(&priv->fence_cbs);
+ INIT_LIST_HEAD(&priv->vblank_ctrl.event_list);
+ INIT_WORK(&priv->vblank_ctrl.work, vblank_ctrl_worker);
drm_mode_config_init(dev);
@@ -468,7 +537,7 @@ static int msm_enable_vblank(struct drm_device *dev, int crtc_id)
if (!kms)
return -ENXIO;
DBG("dev=%p, crtc=%d", dev, crtc_id);
- return kms->funcs->enable_vblank(kms, priv->crtcs[crtc_id]);
+ return vblank_ctrl_queue_work(priv, crtc_id, true);
}
static void msm_disable_vblank(struct drm_device *dev, int crtc_id)
@@ -478,7 +547,7 @@ static void msm_disable_vblank(struct drm_device *dev, int crtc_id)
if (!kms)
return;
DBG("dev=%p, crtc=%d", dev, crtc_id);
- kms->funcs->disable_vblank(kms, priv->crtcs[crtc_id]);
+ vblank_ctrl_queue_work(priv, crtc_id, false);
}
/*
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index e7c5ea1..5816991 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -64,6 +64,12 @@ struct msm_file_private {
int dummy;
};
+struct msm_vblank_ctrl {
+ struct work_struct work;
+ struct list_head event_list;
+ spinlock_t lock;
+};
+
struct msm_drm_private {
struct msm_kms *kms;
@@ -137,6 +143,8 @@ struct msm_drm_private {
*/
struct drm_mm mm;
} vram;
+
+ struct msm_vblank_ctrl vblank_ctrl;
};
struct msm_format {
--
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