linux-kernel - Re: [PATCH v7 8/9] drm: dw-hdmi: use cec_notifier_conn

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Message-ID: <8680ee8a-ff7f-de3c-a185-ff3fb3a93b2b@baylibre.com>
Date:   Mon, 19 Aug 2019 16:47:41 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Dariusz Marcinkiewicz <darekm@...gle.com>,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org
Cc:     Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...ux.ie>,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org, Sean Paul <seanpaul@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v7 8/9] drm: dw-hdmi: use cec_notifier_conn_(un)register

On 19/08/2019 16:41, Hans Verkuil wrote:
> On 8/19/19 4:38 PM, Neil Armstrong wrote:
>> Hi Hans,
>>
>> On 19/08/2019 16:05, Hans Verkuil wrote:
>>> On 8/19/19 11:32 AM, Hans Verkuil wrote:
>>>> On 8/14/19 12:45 PM, Dariusz Marcinkiewicz wrote:
>>>>> Use the new cec_notifier_conn_(un)register() functions to
>>>>> (un)register the notifier for the HDMI connector, and fill in
>>>>> the cec_connector_info.
>>>>>
>>>>> Changes since v6:
>>>>>         - move cec_notifier_conn_unregister to a bridge detach
>>>>> 	  function,
>>>>> 	- add a mutex protecting a CEC notifier.
>>>>> Changes since v4:
>>>>> 	- typo fix
>>>>> Changes since v2:
>>>>> 	- removed unnecessary NULL check before a call to
>>>>> 	cec_notifier_conn_unregister,
>>>>> 	- use cec_notifier_phys_addr_invalidate to invalidate physical
>>>>> 	address.
>>>>> Changes since v1:
>>>>> 	Add memory barrier to make sure that the notifier
>>>>> 	becomes visible to the irq thread once it is fully
>>>>> 	constructed.
>>>>>
>>>>> Signed-off-by: Dariusz Marcinkiewicz <darekm@...gle.com>
>>>>
>>>> Acked-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>>>
>>> Tested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>>
>> Did you test it on an Amlogic platform ? If yes, I don't have to !
> 
> Yes, tested on my khadas VIM2 (modified a bit to fix the issue where
> the CEC physical address wasn't invalidated correctly as discussed here
> earlier).

Good, thanks.

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>

> 
> Regards,
> 
> 	Hans
> 
>>
>> Neil
>>
>>>
>>> Regards,
>>>
>>> 	Hans
>>>
>>>>
>>>> Regards,
>>>>
>>>> 	Hans
>>>>
>>>>> ---
>>>>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 45 +++++++++++++++--------
>>>>>  1 file changed, 30 insertions(+), 15 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>>>>> index 83b94b66e464e..55162c9092f71 100644
>>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>>>>> @@ -190,6 +190,7 @@ struct dw_hdmi {
>>>>>  	void (*enable_audio)(struct dw_hdmi *hdmi);
>>>>>  	void (*disable_audio)(struct dw_hdmi *hdmi);
>>>>>  
>>>>> +	struct mutex cec_notifier_mutex;
>>>>>  	struct cec_notifier *cec_notifier;
>>>>>  };
>>>>>  
>>>>> @@ -2194,6 +2195,8 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
>>>>>  	struct dw_hdmi *hdmi = bridge->driver_private;
>>>>>  	struct drm_encoder *encoder = bridge->encoder;
>>>>>  	struct drm_connector *connector = &hdmi->connector;
>>>>> +	struct cec_connector_info conn_info;
>>>>> +	struct cec_notifier *notifier;
>>>>>  
>>>>>  	connector->interlace_allowed = 1;
>>>>>  	connector->polled = DRM_CONNECTOR_POLL_HPD;
>>>>> @@ -2207,9 +2210,29 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
>>>>>  
>>>>>  	drm_connector_attach_encoder(connector, encoder);
>>>>>  
>>>>> +	cec_fill_conn_info_from_drm(&conn_info, connector);
>>>>> +
>>>>> +	notifier = cec_notifier_conn_register(hdmi->dev, NULL, &conn_info);
>>>>> +	if (!notifier)
>>>>> +		return -ENOMEM;
>>>>> +
>>>>> +	mutex_lock(&hdmi->cec_notifier_mutex);
>>>>> +	hdmi->cec_notifier = notifier;
>>>>> +	mutex_unlock(&hdmi->cec_notifier_mutex);
>>>>> +
>>>>>  	return 0;
>>>>>  }
>>>>>  
>>>>> +static void dw_hdmi_bridge_detach(struct drm_bridge *bridge)
>>>>> +{
>>>>> +	struct dw_hdmi *hdmi = bridge->driver_private;
>>>>> +
>>>>> +	mutex_lock(&hdmi->cec_notifier_mutex);
>>>>> +	cec_notifier_conn_unregister(hdmi->cec_notifier);
>>>>> +	hdmi->cec_notifier = NULL;
>>>>> +	mutex_unlock(&hdmi->cec_notifier_mutex);
>>>>> +}
>>>>> +
>>>>>  static enum drm_mode_status
>>>>>  dw_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
>>>>>  			  const struct drm_display_mode *mode)
>>>>> @@ -2266,6 +2289,7 @@ static void dw_hdmi_bridge_enable(struct drm_bridge *bridge)
>>>>>  
>>>>>  static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
>>>>>  	.attach = dw_hdmi_bridge_attach,
>>>>> +	.detach = dw_hdmi_bridge_detach,
>>>>>  	.enable = dw_hdmi_bridge_enable,
>>>>>  	.disable = dw_hdmi_bridge_disable,
>>>>>  	.mode_set = dw_hdmi_bridge_mode_set,
>>>>> @@ -2373,9 +2397,11 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
>>>>>  				       phy_stat & HDMI_PHY_HPD,
>>>>>  				       phy_stat & HDMI_PHY_RX_SENSE);
>>>>>  
>>>>> -		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0)
>>>>> -			cec_notifier_set_phys_addr(hdmi->cec_notifier,
>>>>> -						   CEC_PHYS_ADDR_INVALID);
>>>>> +		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0) {
>>>>> +			mutex_lock(&hdmi->cec_notifier_mutex);
>>>>> +			cec_notifier_phys_addr_invalidate(hdmi->cec_notifier);
>>>>> +			mutex_unlock(&hdmi->cec_notifier_mutex);
>>>>> +		}
>>>>>  	}
>>>>>  
>>>>>  	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
>>>>> @@ -2561,6 +2587,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
>>>>>  
>>>>>  	mutex_init(&hdmi->mutex);
>>>>>  	mutex_init(&hdmi->audio_mutex);
>>>>> +	mutex_init(&hdmi->cec_notifier_mutex);
>>>>>  	spin_lock_init(&hdmi->audio_lock);
>>>>>  
>>>>>  	ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0);
>>>>> @@ -2693,12 +2720,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
>>>>>  	if (ret)
>>>>>  		goto err_iahb;
>>>>>  
>>>>> -	hdmi->cec_notifier = cec_notifier_get(dev);
>>>>> -	if (!hdmi->cec_notifier) {
>>>>> -		ret = -ENOMEM;
>>>>> -		goto err_iahb;
>>>>> -	}
>>>>> -
>>>>>  	/*
>>>>>  	 * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
>>>>>  	 * N and cts values before enabling phy
>>>>> @@ -2796,9 +2817,6 @@ __dw_hdmi_probe(struct platform_device *pdev,
>>>>>  		hdmi->ddc = NULL;
>>>>>  	}
>>>>>  
>>>>> -	if (hdmi->cec_notifier)
>>>>> -		cec_notifier_put(hdmi->cec_notifier);
>>>>> -
>>>>>  	clk_disable_unprepare(hdmi->iahb_clk);
>>>>>  	if (hdmi->cec_clk)
>>>>>  		clk_disable_unprepare(hdmi->cec_clk);
>>>>> @@ -2820,9 +2838,6 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
>>>>>  	/* Disable all interrupts */
>>>>>  	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
>>>>>  
>>>>> -	if (hdmi->cec_notifier)
>>>>> -		cec_notifier_put(hdmi->cec_notifier);
>>>>> -
>>>>>  	clk_disable_unprepare(hdmi->iahb_clk);
>>>>>  	clk_disable_unprepare(hdmi->isfr_clk);
>>>>>  	if (hdmi->cec_clk)
>>>>>
>>>>
>>>
>>
>