Re: [RFC PATCH v2 3/3] drm/rockchip: analogix_dp: add PSR support
From: Yakir Yang
Date: Thu Jun 02 2016 - 09:38:19 EST
Hi Daniel,
Thanks for your fast respond.
On 06/02/2016 09:18 PM, Daniel Vetter wrote:
On Thu, Jun 02, 2016 at 08:57:38PM +0800, Yakir Yang wrote:
Let VOP vblank status decide whether panle should enter into or
exit from PSR status. Before eDP start to change PSR status, it
need to wait for VOP vact_end event. In order to listen vact_end
event, I create a new file about PSR notify between eDP and VOP.
Signed-off-by: Yakir Yang <ykk@xxxxxxxxxxxxxx>
---
Changes in v2:
- Remove vblank notify out (Daniel)
- Create a psr_active() callback in vop data struct.
Still contains a notifier. Still doesn't contain a proper fb->dirty
callback. Please don't just act on review without understanding the deeper
implications, since I didn't ask you to remove the vblank logic (you
probably still need that), I suggested to implement it differently
(withotu notifiers).
-Daniel
Yes, I misunderstand what you comment before, I thought only
the vblank notify is bad, so i create a callback entry in vop. But
the vact_end event is still an evil too, specific to a given crtc.
Hmmm, after i abandon the notify, i need to found a good way
for eDP to get the vact_end or vblank event. That would be a
question, have no idea now.....
As for why i ignore the the fb->dirty callback in this case, please
see my previous reply to you.
Thanks,
- Yakir
drivers/gpu/drm/rockchip/Makefile | 2 +-
drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 64 ++++++++++++++++++++++++-
drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 7 +++
drivers/gpu/drm/rockchip/rockchip_drm_notify.c | 54 +++++++++++++++++++++
drivers/gpu/drm/rockchip/rockchip_drm_notify.h | 23 +++++++++
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 41 ++++++++++++++++
6 files changed, 189 insertions(+), 2 deletions(-)
create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_notify.c
create mode 100644 drivers/gpu/drm/rockchip/rockchip_drm_notify.h
diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
index 05d0713..49fee8c 100644
--- a/drivers/gpu/drm/rockchip/Makefile
+++ b/drivers/gpu/drm/rockchip/Makefile
@@ -3,7 +3,7 @@
# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o \
- rockchip_drm_gem.o rockchip_drm_vop.o
+ rockchip_drm_gem.o rockchip_drm_vop.o rockchip_drm_notify.o
rockchipdrm-$(CONFIG_DRM_FBDEV_EMULATION) += rockchip_drm_fbdev.o
obj-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 4b64964..25fb687 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -33,6 +33,7 @@
#include "rockchip_drm_drv.h"
#include "rockchip_drm_vop.h"
+#include "rockchip_drm_notify.h"
#define to_dp(nm) container_of(nm, struct rockchip_dp_device, nm)
@@ -54,6 +55,10 @@ struct rockchip_dp_device {
struct regmap *grf;
struct reset_control *rst;
+ struct workqueue_struct *dp_workq;
+ struct work_struct psr_work;
+ unsigned int psr_state;
+
const struct rockchip_dp_chip_data *data;
struct analogix_dp_plat_data plat_data;
@@ -97,6 +102,42 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
return 0;
}
+static int rockchip_dp_psr_active(enum psr_action action, void *priv)
+{
+ struct rockchip_dp_device *dp = (struct rockchip_dp_device *)priv;
+
+ switch (action) {
+ case PSR_INACTIVE:
+ dp->psr_state = 0;
+ break;
+ case PSR_ACTIVE:
+ dp->psr_state = EDP_VSC_PSR_STATE_ACTIVE;
+ break;
+ default:
+ return 0;
+ }
+
+ queue_work(dp->dp_workq, &dp->psr_work);
+ return 0;
+}
+
+static void dp_psr_work(struct work_struct *psr_work)
+{
+ struct rockchip_dp_device *dp = to_dp(psr_work);
+ int psr_state = dp->psr_state;
+ int ret;
+
+ if (psr_state == EDP_VSC_PSR_STATE_ACTIVE) {
+ ret = rockchip_psr_ready_wait();
+ if (ret == 0)
+ analogix_dp_actice_psr(dp->dev);
+ } else {
+ ret = rockchip_psr_ready_wait();
+ if (ret == 0)
+ analogix_dp_inactice_psr(dp->dev);
+ }
+}
+
static enum drm_mode_status
rockchip_dp_mode_valid(struct analogix_dp_plat_data *plat_data,
struct drm_connector *connector,
@@ -128,9 +169,18 @@ static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted)
{
- /* do nothing */
+ struct rockchip_dp_device *dp = to_dp(encoder);
+ struct drm_crtc *crtc = encoder->crtc;
+ struct rockchip_crtc_state *s;
+
+ if (crtc) {
+ s = to_rockchip_crtc_state(crtc->state);
+ s->psr_active = rockchip_dp_psr_active;
+ s->psr_priv = dp;
+ }
}
+
static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder)
{
struct rockchip_dp_device *dp = to_dp(encoder);
@@ -198,6 +248,9 @@ rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
break;
}
+ s->psr_active = rockchip_dp_psr_active;
+ s->psr_priv = dp;
+
return 0;
}
@@ -320,6 +373,15 @@ static int rockchip_dp_bind(struct device *dev, struct device *master,
dp->plat_data.power_off = rockchip_dp_powerdown;
dp->plat_data.mode_valid = rockchip_dp_mode_valid;
+ dp->dp_workq = create_singlethread_workqueue("dp");
+ if (!dp->dp_workq) {
+ dev_err(dp->dev, "failed to create workqueue\n");
+ return PTR_ERR(dp->dp_workq);
+ }
+
+ dp->psr_state = 0;
+ INIT_WORK(&dp->psr_work, dp_psr_work);
+
return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
}
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
index 56f43a3..f1ccc10 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -31,6 +31,11 @@
struct drm_device;
struct drm_connector;
+enum psr_action {
+ PSR_ACTIVE = 0,
+ PSR_INACTIVE,
+};
+
/*
* Rockchip drm private crtc funcs.
* @enable_vblank: enable crtc vblank irq.
@@ -54,6 +59,8 @@ struct rockchip_crtc_state {
struct drm_crtc_state base;
int output_type;
int output_mode;
+ int (*psr_active)(enum psr_action action, void *priv);
+ void *psr_priv;
};
#define to_rockchip_crtc_state(s) \
container_of(s, struct rockchip_crtc_state, base)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_notify.c b/drivers/gpu/drm/rockchip/rockchip_drm_notify.c
new file mode 100644
index 0000000..908e991
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_notify.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
+ * Author: Yakir Yang <ykk@xxxxxxxxxxxxxx>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include "rockchip_drm_notify.h"
+
+static RAW_NOTIFIER_HEAD(psr_ready_chain);
+static DEFINE_MUTEX(psr_ready_lock);
+
+int rockchip_drm_psr_ready_register_notifier(struct notifier_block *nb)
+{
+ int ret = 0;
+
+ if (!nb)
+ return -EINVAL;
+
+ ret = raw_notifier_chain_register(&psr_ready_chain, nb);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rockchip_drm_psr_ready_register_notifier);
+
+int rockchip_drm_psr_ready_unregister_notifier(struct notifier_block *nb)
+{
+ int ret = 0;
+
+ if (!nb)
+ return -EINVAL;
+
+ ret = raw_notifier_chain_unregister(&psr_ready_chain, nb);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rockchip_drm_psr_ready_unregister_notifier);
+
+int rockchip_psr_ready_wait(void)
+{
+ int ret;
+
+ ret = raw_notifier_call_chain(&psr_ready_chain, 0, 0);
+ if (ret == NOTIFY_BAD)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rockchip_psr_ready_wait);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_notify.h b/drivers/gpu/drm/rockchip/rockchip_drm_notify.h
new file mode 100644
index 0000000..1b190e5
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_notify.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __ROCKCHIP_DRM_NOTIFY_H
+#define __ROCKCHIP_DRM_NOTIFY_H
+
+#include <linux/notifier.h>
+
+int rockchip_psr_ready_wait(void);
+int rockchip_drm_psr_ready_register_notifier(struct notifier_block *nb);
+int rockchip_drm_psr_ready_unregister_notifier(struct notifier_block *nb);
+
+#endif /* __ROCKCHIP_DRM_NOTIFY_H */
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index b2a36db..b5a015b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -35,6 +35,7 @@
#include "rockchip_drm_gem.h"
#include "rockchip_drm_fb.h"
#include "rockchip_drm_vop.h"
+#include "rockchip_drm_notify.h"
#define __REG_SET_RELAXED(x, off, mask, shift, v, write_mask) \
vop_mask_write(x, off, mask, shift, v, write_mask, true)
@@ -117,6 +118,10 @@ struct vop {
struct completion wait_update_complete;
struct drm_pending_vblank_event *event;
+ /* eDP PSR callback */
+ int (*psr_active)(enum psr_action action, void *priv);
+ void *psr_priv;
+ struct notifier_block psr_prepare_nb;
struct completion line_flag_completion;
const struct vop_data *data;
@@ -906,6 +911,9 @@ static int vop_crtc_enable_vblank(struct drm_crtc *crtc)
spin_unlock_irqrestore(&vop->irq_lock, flags);
+ if (vop->psr_active)
+ vop->psr_active(PSR_INACTIVE, vop->psr_priv);
+
return 0;
}
@@ -922,6 +930,9 @@ static void vop_crtc_disable_vblank(struct drm_crtc *crtc)
VOP_INTR_SET_TYPE(vop, enable, FS_INTR, 0);
spin_unlock_irqrestore(&vop->irq_lock, flags);
+
+ if (vop->psr_active)
+ vop->psr_active(PSR_ACTIVE, vop->psr_priv);
}
static void vop_crtc_wait_for_update(struct drm_crtc *crtc)
@@ -1066,6 +1077,9 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
clk_set_rate(vop->dclk, adjusted_mode->clock * 1000);
VOP_CTRL_SET(vop, standby, 0);
+
+ vop->psr_active = s->psr_active;
+ vop->psr_priv = s->psr_priv;
}
static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
@@ -1178,6 +1192,30 @@ static void vop_handle_vblank(struct vop *vop)
complete(&vop->wait_update_complete);
}
+static int psr_prepare_notify(struct notifier_block *psr_prepare_nb,
+ unsigned long action, void *data)
+{
+ struct vop *vop = container_of(psr_prepare_nb, struct vop,
+ psr_prepare_nb);
+ struct drm_display_mode *mode = &vop->crtc.mode;
+ int vact_end = mode->vtotal - mode->vsync_start + mode->vdisplay;
+ unsigned long jiffies_left;
+
+ reinit_completion(&vop->line_flag_completion);
+ vop_line_flag_irq_enable(vop, vact_end);
+
+ jiffies_left = wait_for_completion_timeout(&vop->line_flag_completion,
+ msecs_to_jiffies(200));
+ vop_line_flag_irq_disable(vop);
+
+ if (jiffies_left == 0) {
+ dev_err(vop->dev, "Timeout waiting for IRQ\n");
+ return NOTIFY_BAD;
+ }
+
+ return NOTIFY_STOP;
+}
+
static irqreturn_t vop_isr(int irq, void *data)
{
struct vop *vop = data;
@@ -1312,6 +1350,9 @@ static int vop_create_crtc(struct vop *vop)
goto err_cleanup_crtc;
}
+ vop->psr_prepare_nb.notifier_call = psr_prepare_notify;
+ rockchip_drm_psr_ready_register_notifier(&vop->psr_prepare_nb);
+
init_completion(&vop->dsp_hold_completion);
init_completion(&vop->wait_update_complete);
init_completion(&vop->line_flag_completion);
--
1.9.1
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