On 7/1/19 4:59 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 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@xxxxxxxxxx>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 37 +++++++++++++++--------
> 1 file changed, 24 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index ab7968c8f6a29..c0f4eb3c12b18 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2118,6 +2118,8 @@ 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;
> @@ -2129,6 +2131,18 @@ 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;
> + /*
> + * Make sure that dw_hdmi_irq thread does see the notifier
> + * when it fully constructed.
> + */
> + smp_wmb();
> + hdmi->cec_notifier = notifier;
> +
> return 0;
> }
>
> @@ -2295,9 +2309,15 @@ 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) {
> + struct cec_notifier *notifer;
> +
> + notifer = READ_ONCE(hdmi->cec_notifier);
> + if (notifer)
> + cec_notifier_set_phys_addr(
> + notifer,
> + CEC_PHYS_ADDR_INVALID);
Please replace with cec_notifier_phys_addr_invalidate().
> + }
> }
>
> if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
> @@ -2600,12 +2620,6 @@ __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
> @@ -2693,9 +2707,6 @@ __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);
> @@ -2718,7 +2729,7 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
> hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
>
> if (hdmi->cec_notifier)
> - cec_notifier_put(hdmi->cec_notifier);
> + cec_notifier_conn_unregister(hdmi->cec_notifier);
No need for the 'if', cec_notifier_conn_unregister() already checks for a NULL
notifier.
Regards,
Hans
>
> clk_disable_unprepare(hdmi->iahb_clk);
> clk_disable_unprepare(hdmi->isfr_clk);
>
