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Message-ID: <3ae37c2f-94da-5ad0-a244-ef9658fc35e2@xs4all.nl>
Date: Mon, 19 Aug 2019 16:05:10 +0200
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: 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>,
Neil Armstrong <narmstrong@...libre.com>,
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 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>
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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