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 <dar...@google.com>
> 
> Acked-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>

Tested-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>

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)
>>
> 

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