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Subject: Re: [PATCH v7 8/9] drm: dw-hdmi: use cec_notifier_conn_(un)register
From:   Neil Armstrong <narmstrong@baylibre.com>
To:     Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Dariusz Marcinkiewicz <darekm@google.com>,
        dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org
Cc:     Jernej Skrabec <jernej.skrabec@siol.net>,
        Jonas Karlman <jonas@kwiboo.se>,
        David Airlie <airlied@linux.ie>,
        Douglas Anderson <dianders@chromium.org>,
        linux-kernel@vger.kernel.org, Sean Paul <seanpaul@chromium.org>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Sam Ravnborg <sam@ravnborg.org>
References: <20190814104520.6001-1-darekm@google.com>
 <20190814104520.6001-9-darekm@google.com>
 <b04edaf8-6116-69ab-fd8f-c28c90f73ad7@xs4all.nl>
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 <389b558f-06ec-8ec0-07ab-256dff3d4cb0@xs4all.nl>
 <8680ee8a-ff7f-de3c-a185-ff3fb3a93b2b@baylibre.com>
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Organization: Baylibre
Message-ID: <ea7d8969-78ae-a4a0-3f3f-5fc52307421e@baylibre.com>
Date:   Tue, 20 Aug 2019 09:48:47 +0200
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On 19/08/2019 16:47, Neil Armstrong wrote:
> 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@google.com>
>>>>>
>>>>> Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
>>>>
>>>> Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.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@baylibre.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)
>>>>>>
>>>>>
>>>>
>>>
>>
> 

Applying to drm-misc-next