[RFCv2 PATCH 3/5] drm/bridge: dw_hdmi: add HDMI notifier support

[Pierre-Hugues Husson]

Hi Hans,

2016-11-14 16:22 GMT+01:00 Hans Verkuil <hverkuil at xs4all.nl>:
> From: Russell King <rmk+kernel at arm.linux.org.uk>
>
> Add HDMI notifiers to the HDMI bridge driver.
>
> Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
> ---
>  drivers/gpu/drm/bridge/Kconfig   |  1 +
>  drivers/gpu/drm/bridge/dw-hdmi.c | 25 ++++++++++++++++++++++++-
>  2 files changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 10e12e7..5f4ebe9 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -27,6 +27,7 @@ config DRM_DUMB_VGA_DAC
>  config DRM_DW_HDMI
>         tristate
>         select DRM_KMS_HELPER
> +       select HDMI_NOTIFIERS
>
>  config DRM_DW_HDMI_AHB_AUDIO
>         tristate "Synopsis Designware AHB Audio interface"
> diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
> index ab7023e..bd02da5 100644
> --- a/drivers/gpu/drm/bridge/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/dw-hdmi.c
> @@ -16,6 +16,7 @@
>  #include <linux/err.h>
>  #include <linux/clk.h>
>  #include <linux/hdmi.h>
> +#include <linux/hdmi-notifier.h>
>  #include <linux/mutex.h>
>  #include <linux/of_device.h>
>  #include <linux/spinlock.h>
> @@ -114,6 +115,7 @@ struct dw_hdmi {
>
>         struct hdmi_data_info hdmi_data;
>         const struct dw_hdmi_plat_data *plat_data;
> +       struct hdmi_notifier *n;
>
>         int vic;
>
> @@ -1448,9 +1450,11 @@ 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);
> +               hdmi_event_new_edid(hdmi->n, edid, 0);
>                 ret = drm_add_edid_modes(connector, edid);
>                 /* Store the ELD */
>                 drm_edid_to_eld(connector, edid);
> +               hdmi_event_new_eld(hdmi->n, connector->eld);
>                 kfree(edid);
>         } else {
>                 dev_dbg(hdmi->dev, "failed to get edid\n");
> @@ -1579,6 +1583,12 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
>                         dw_hdmi_update_phy_mask(hdmi);
>                 }
>                 mutex_unlock(&hdmi->mutex);
> +
> +               if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0)
> +                       hdmi_event_disconnect(hdmi->n);
> +               else if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) ==
> +                        (HDMI_IH_PHY_STAT0_RX_SENSE | HDMI_PHY_HPD))
> +                       hdmi_event_connect(hdmi->n);
>         }
>
>         if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
> @@ -1732,11 +1742,17 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
>
>         initialize_hdmi_ih_mutes(hdmi);
>
> +       hdmi->n = hdmi_notifier_get(dev);
> +       if (!hdmi->n) {
> +               ret = -ENOMEM;
> +               goto err_iahb;
> +       }
> +
>         ret = devm_request_threaded_irq(dev, irq, dw_hdmi_hardirq,
>                                         dw_hdmi_irq, IRQF_SHARED,
>                                         dev_name(dev), hdmi);
>         if (ret)
> -               goto err_iahb;
> +               goto err_hdmi_not;
>
>         /*
>          * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
> @@ -1788,6 +1804,8 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
>
>         return 0;
>
> +err_hdmi_not:
> +       hdmi_notifier_put(hdmi->n);
>  err_iahb:
>         clk_disable_unprepare(hdmi->iahb_clk);
>  err_isfr:
> @@ -1804,6 +1822,11 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data)
>         if (hdmi->audio && !IS_ERR(hdmi->audio))
>                 platform_device_unregister(hdmi->audio);
>
> +       hdmi_notifier_put(hdmi->n);
> +
> +       if (!IS_ERR(hdmi->cec))
> +               platform_device_unregister(hdmi->cec);
Those two lines should be in your 4/5
> +
>         /* Disable all interrupts */
>         hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);