drm: dw-hdmi: use cec_notifier_conn_(un)register

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>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190814104520.6001-9-darekm@google.com

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 4044071..355877f 100644 (file)
--- 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;
 };
 
@@ -2230,6 +2231,8 @@ 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;
@@ -2243,9 +2246,29 @@ 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)
@@ -2302,6 +2325,7 @@ 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,
@@ -2409,9 +2433,11 @@ 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) {
@@ -2597,6 +2623,7 @@ __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);
@@ -2729,12 +2756,6 @@ __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
@@ -2833,9 +2854,6 @@ err_iahb:
                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);
@@ -2857,9 +2875,6 @@ 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)