linux-kernel - Re: [PATCH v2 14/14] drm/msm/hdmi: wire in hpd_enable/hpd

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Date: Wed, 19 Jun 2024 15:14:01 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark
	<robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul
	<sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        "David
 Airlie" <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 14/14] drm/msm/hdmi: wire in hpd_enable/hpd_disable
 bridge ops



On 5/22/2024 3:51 AM, Dmitry Baryshkov wrote:
> The HDMI driver already has msm_hdmi_hpd_enable() and
> msm_hdmi_hpd_disable() functions. Wire them into the
> msm_hdmi_bridge_funcs, so that HPD  can be enabled and disabled
> dynamically rather than always having HPD events generation enabled.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>

> ---
>   drivers/gpu/drm/msm/hdmi/hdmi.c        |  9 ---------
>   drivers/gpu/drm/msm/hdmi/hdmi.h        |  4 ++--
>   drivers/gpu/drm/msm/hdmi/hdmi_bridge.c |  3 +++
>   drivers/gpu/drm/msm/hdmi/hdmi_hpd.c    | 12 ++++++------
>   4 files changed, 11 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> index 2890196857f8..06adcf4a6544 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> @@ -202,12 +202,6 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
>   		goto fail;
>   	}
>   
> -	ret = msm_hdmi_hpd_enable(hdmi->bridge);
> -	if (ret < 0) {
> -		DRM_DEV_ERROR(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
> -		goto fail;
> -	}
> -
>   	return 0;
>   
>   fail:
> @@ -377,9 +371,6 @@ static void msm_hdmi_unbind(struct device *dev, struct device *master,
>   		if (priv->hdmi->audio_pdev)
>   			platform_device_unregister(priv->hdmi->audio_pdev);
>   
> -		if (priv->hdmi->bridge)
> -			msm_hdmi_hpd_disable(priv->hdmi);
> -
>   		msm_hdmi_destroy(priv->hdmi);
>   		priv->hdmi = NULL;
>   	}
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.h b/drivers/gpu/drm/msm/hdmi/hdmi.h
> index 7f0ca5252018..c6519e6f7f2c 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.h
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.h
> @@ -219,8 +219,8 @@ int msm_hdmi_bridge_init(struct hdmi *hdmi);
>   void msm_hdmi_hpd_irq(struct drm_bridge *bridge);
>   enum drm_connector_status msm_hdmi_bridge_detect(
>   		struct drm_bridge *bridge);
> -int msm_hdmi_hpd_enable(struct drm_bridge *bridge);
> -void msm_hdmi_hpd_disable(struct hdmi *hdmi);
> +void msm_hdmi_hpd_enable(struct drm_bridge *bridge);
> +void msm_hdmi_hpd_disable(struct drm_bridge *bridge);
>   
>   /*
>    * i2c adapter for ddc:
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> index 104107ed47d0..41722b2e6b44 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
> @@ -300,6 +300,9 @@ static const struct drm_bridge_funcs msm_hdmi_bridge_funcs = {
>   	.mode_valid = msm_hdmi_bridge_mode_valid,
>   	.edid_read = msm_hdmi_bridge_edid_read,
>   	.detect = msm_hdmi_bridge_detect,
> +
> +	.hpd_enable = msm_hdmi_hpd_enable,
> +	.hpd_disable = msm_hdmi_hpd_disable,
>   };
>   
>   static void
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c b/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c
> index cb89e9e2c6ea..04d00b6f36fd 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi_hpd.c
> @@ -60,7 +60,7 @@ static void msm_hdmi_phy_reset(struct hdmi *hdmi)
>   	}
>   }
>   
> -int msm_hdmi_hpd_enable(struct drm_bridge *bridge)
> +void msm_hdmi_hpd_enable(struct drm_bridge *bridge)
>   {
>   	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
>   	struct hdmi *hdmi = hdmi_bridge->hdmi;
> @@ -70,8 +70,8 @@ int msm_hdmi_hpd_enable(struct drm_bridge *bridge)
>   	unsigned long flags;
>   
>   	ret = pm_runtime_resume_and_get(dev);
> -	if (ret)
> -		return ret;
> +	if (WARN_ON(ret))
> +		return;
>   
>   	mutex_lock(&hdmi->state_mutex);
>   	msm_hdmi_set_mode(hdmi, false);
> @@ -99,12 +99,12 @@ int msm_hdmi_hpd_enable(struct drm_bridge *bridge)
>   	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
>   			HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
>   	spin_unlock_irqrestore(&hdmi->reg_lock, flags);
> -
> -	return 0;
>   }
>   
> -void msm_hdmi_hpd_disable(struct hdmi *hdmi)
> +void msm_hdmi_hpd_disable(struct drm_bridge *bridge)
>   {
> +	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
> +	struct hdmi *hdmi = hdmi_bridge->hdmi;
>   	struct device *dev = &hdmi->pdev->dev;
>   
>   	/* Disable HPD interrupt */
> 
> -- 
> 2.39.2
>