Date:	Thu, 2 Jun 2016 15:18:47 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Yakir Yang <ykk@...k-chips.com>
Cc:	Mark Yao <yzq@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
	tfiga@...omium.org, daniel.vetter@...ll.ch, dianders@...omium.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	Thierry Reding <treding@...dia.com>
Subject: Re: [RFC PATCH v2 3/3] drm/rockchip: analogix_dp: add PSR support

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@...k-chips.com>
> ---
> 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

> 
>  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@...k-chips.com>
> + *
> + * 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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> dri-devel@...ts.freedesktop.org
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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