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From:   "Jingoo Han" <jingoohan1@gmail.com>
To:     "'Enric Balletbo i Serra'" <enric.balletbo@collabora.com>,
        <architt@codeaurora.org>, <inki.dae@samsung.com>,
        <thierry.reding@gmail.com>, <hjc@rock-chips.com>,
        <seanpaul@chromium.org>, <airlied@linux.ie>, <tfiga@chromium.org>,
        <heiko@sntech.de>
Cc:     <dri-devel@lists.freedesktop.org>, <dianders@chromium.org>,
        <a.hajda@samsung.com>, <kernel@collabora.com>,
        <m.szyprowski@samsung.com>, <linux-samsung-soc@vger.kernel.org>,
        <jy0922.shim@samsung.com>, <rydberg@bitmath.org>,
        <krzk@kernel.org>, <linux-rockchip@lists.infradead.org>,
        <kgene@kernel.org>, <orjan.eide@arm.com>, <wxt@rock-chips.com>,
        <jeffy.chen@rock-chips.com>,
        <linux-arm-kernel@lists.infradead.org>, <wzz@rock-chips.com>,
        <hl@rock-chips.com>, <sw0312.kim@samsung.com>,
        <linux-kernel@vger.kernel.org>, <kyungmin.park@samsung.com>,
        <Laurent.pinchart@ideasonboard.com>, <kuankuan.y@gmail.com>,
        <hshi@chromium.org>
References: <20180423105003.9004-1-enric.balletbo@collabora.com> <20180423105003.9004-14-enric.balletbo@collabora.com>
In-Reply-To: <20180423105003.9004-14-enric.balletbo@collabora.com>
Subject: Re: [RESEND PATCH v6 13/27] drm/rockchip: Restore psr->state when enable/disable psr failed
Date:   Tue, 24 Apr 2018 09:58:50 -0400
Message-ID: <000401d3dbd4$61b507c0$251f1740$@gmail.com>
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On Monday, April 23, 2018 6:50 AM, Enric Balletbo i Serra wrote:
> 
> From: zain wang <wzz@rock-chips.com>
> 
> If we failed disable psr, it would hang the display until next psr
> cycle coming. So we should restore psr->state when it failed.
> 
> Cc: Tomasz Figa <tfiga@chromium.org>
> Signed-off-by: zain wang <wzz@rock-chips.com>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> Reviewed-by: Archit Taneja <architt@codeaurora.org>

Acked-by: Jingoo Han <jingoohan1@gmail.com>

Best regards,
Jingoo Han

> ---
> 
>  .../drm/bridge/analogix/analogix_dp_core.c    |  4 +++-
>  .../gpu/drm/rockchip/analogix_dp-rockchip.c   | 10 +++++-----
>  drivers/gpu/drm/rockchip/rockchip_drm_psr.c   | 20 ++++++++++++-------
>  drivers/gpu/drm/rockchip/rockchip_drm_psr.h   |  2 +-
>  4 files changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 75e61ebf6722..5540e2dfc2ec 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -153,8 +153,10 @@ int analogix_dp_disable_psr(struct analogix_dp_device
> *dp)
>  	psr_vsc.DB1 = 0;
> 
>  	ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
> -	if (ret != 1)
> +	if (ret != 1) {
>  		dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret);
> +		return ret;
> +	}
> 
>  	return analogix_dp_send_psr_spd(dp, &psr_vsc, false);
>  }
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 3e8bf79bea58..8c884f9ce713 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -77,13 +77,13 @@ struct rockchip_dp_device {
>  	struct analogix_dp_plat_data plat_data;
>  };
> 
> -static void analogix_dp_psr_set(struct drm_encoder *encoder, bool
enabled)
> +static int analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
>  {
>  	struct rockchip_dp_device *dp = to_dp(encoder);
>  	int ret;
> 
>  	if (!analogix_dp_psr_enabled(dp->adp))
> -		return;
> +		return 0;
> 
>  	DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
> 
> @@ -91,13 +91,13 @@ static void analogix_dp_psr_set(struct drm_encoder
> *encoder, bool enabled)
>  					 PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
>  	if (ret) {
>  		DRM_DEV_ERROR(dp->dev, "line flag interrupt did not
> arrive\n");
> -		return;
> +		return -ETIMEDOUT;
>  	}
> 
>  	if (enabled)
> -		analogix_dp_enable_psr(dp->adp);
> +		return analogix_dp_enable_psr(dp->adp);
>  	else
> -		analogix_dp_disable_psr(dp->adp);
> +		return analogix_dp_disable_psr(dp->adp);
>  }
> 
>  static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> index b339ca943139..9376f4396b6b 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> @@ -36,7 +36,7 @@ struct psr_drv {
> 
>  	struct delayed_work	flush_work;
> 
> -	void (*set)(struct drm_encoder *encoder, bool enable);
> +	int (*set)(struct drm_encoder *encoder, bool enable);
>  };
> 
>  static struct psr_drv *find_psr_by_crtc(struct drm_crtc *crtc)
> @@ -93,19 +93,25 @@ static void psr_set_state_locked(struct psr_drv *psr,
> enum psr_state state)
>  		return;
>  	}
> 
> -	psr->state = state;
> -
>  	/* Actually commit the state change to hardware */
> -	switch (psr->state) {
> +	switch (state) {
>  	case PSR_ENABLE:
> -		psr->set(psr->encoder, true);
> +		if (psr->set(psr->encoder, true))
> +			return;
>  		break;
> 
>  	case PSR_DISABLE:
>  	case PSR_FLUSH:
> -		psr->set(psr->encoder, false);
> +		if (psr->set(psr->encoder, false))
> +			return;
>  		break;
> +
> +	default:
> +		pr_err("%s: Unknown state %d\n", __func__, state);
> +		return;
>  	}
> +
> +	psr->state = state;
>  }
> 
>  static void psr_set_state(struct psr_drv *psr, enum psr_state state)
> @@ -229,7 +235,7 @@ EXPORT_SYMBOL(rockchip_drm_psr_flush_all);
>   * Zero on success, negative errno on failure.
>   */
>  int rockchip_drm_psr_register(struct drm_encoder *encoder,
> -			void (*psr_set)(struct drm_encoder *, bool enable))
> +			int (*psr_set)(struct drm_encoder *, bool enable))
>  {
>  	struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
>  	struct psr_drv *psr;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> index b1ea0155e57c..06537ee27565 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> @@ -22,7 +22,7 @@ int rockchip_drm_psr_activate(struct drm_encoder
> *encoder);
>  int rockchip_drm_psr_deactivate(struct drm_encoder *encoder);
> 
>  int rockchip_drm_psr_register(struct drm_encoder *encoder,
> -			void (*psr_set)(struct drm_encoder *, bool enable));
> +			int (*psr_set)(struct drm_encoder *, bool enable));
>  void rockchip_drm_psr_unregister(struct drm_encoder *encoder);
> 
>  #endif /* __ROCKCHIP_DRM_PSR__ */
> --
> 2.17.0