linux-kernel - Re: [PATCH] drm/bridge: dw_hdmi: add cec notifier support

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Message-ID: <fd9776db-f705-5fee-cf5e-7e6c016f8f37@baylibre.com>
Date:   Thu, 6 Jul 2017 13:27:37 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     architt@...eaurora.org, a.hajda@...sung.com,
        linux-amlogic@...ts.infradead.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/bridge: dw_hdmi: add cec notifier support

On 07/06/2017 12:43 PM, Jose Abreu wrote:
> Hi Neil,
> 
> 
> On 06-07-2017 11:33, Neil Armstrong wrote:
>> From: Russell King <rmk+kernel@...linux.org.uk>
>>
>> Add CEC notifier support to the HDMI bridge driver, so that the CEC
>> part of the IP can receive its physical address.
>>
>> Tested-by: Neil Armstrong <narmstrong@...libre.com>
>> Acked-by: Neil Armstrong <narmstrong@...libre.com>
>> Acked-by: Hans Verkuil <hans.verkuil@...co.com>
>> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 18 ++++++++++++++++++
>>  1 file changed, 18 insertions(+)
>>
>> Hi Archit, Hans,
>>
>> This is repost of Russell's patch from his dw-hdmi CEC patchset.
>>
>> Since his CEC implementation will be integrated in the bridge driver,
>> this notifier patch won't be re-posted.
>>
>> But the Amlogic Platform needs a notifier since it uses a standalone CEC
>> controller.
>>
>> Thanks,
>> Neil
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> index ead1124..9c03846 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> @@ -33,6 +33,8 @@
>>  #include <uapi/linux/media-bus-format.h>
>>  #include <uapi/linux/videodev2.h>
>>  
>> +#include <media/cec-notifier.h>
> 
> Don't you also have to "select CEC_NOTIFIER" in Kconfig? Or is it
> not needed anymore with the recent Kconfig changes of CEC?

Hi Jose,

Seems no, since the cec functions are protected with :
#if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)

and replaced with dummy inline functions.

Neil

> 
> Best regards,
> Jose Miguel Abreu
> 
>> +
>>  #include "dw-hdmi.h"
>>  #include "dw-hdmi-audio.h"
>>  
>> @@ -175,6 +177,8 @@ struct dw_hdmi {
>>  	struct regmap *regm;
>>  	void (*enable_audio)(struct dw_hdmi *hdmi);
>>  	void (*disable_audio)(struct dw_hdmi *hdmi);
>> +
>> +	struct cec_notifier *cec_notifier;
>>  };
>>  
>>  #define HDMI_IH_PHY_STAT0_RX_SENSE \
>> @@ -1896,6 +1900,7 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
>>  		hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
>>  		hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
>>  		drm_mode_connector_update_edid_property(connector, edid);
>> +		cec_notifier_set_phys_addr_from_edid(hdmi->cec_notifier, edid);
>>  		ret = drm_add_edid_modes(connector, edid);
>>  		/* Store the ELD */
>>  		drm_edid_to_eld(connector, edid);
>> @@ -2077,6 +2082,10 @@ void __dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense)
>>  		dw_hdmi_update_phy_mask(hdmi);
>>  	}
>>  	mutex_unlock(&hdmi->mutex);
>> +
>> +	if (!rx_sense && !hpd)
>> +		cec_notifier_set_phys_addr(hdmi->cec_notifier,
>> +					   CEC_PHYS_ADDR_INVALID);
>>  }
>>  
>>  void dw_hdmi_setup_rx_sense(struct device *dev, bool hpd, bool rx_sense)
>> @@ -2376,6 +2385,12 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
>>  	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
>> @@ -2452,6 +2467,9 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
>>  		hdmi->ddc = NULL;
>>  	}
>>  
>> +	if (hdmi->cec_notifier)
>> +		cec_notifier_put(hdmi->cec_notifier);
>> +
>>  	clk_disable_unprepare(hdmi->iahb_clk);
>>  err_isfr:
>>  	clk_disable_unprepare(hdmi->isfr_clk);
>