| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <b04edaf8-6116-69ab-fd8f-c28c90f73ad7@xs4all.nl>
Date: Mon, 19 Aug 2019 11:32:24 +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 8/14/19 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>
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)
>
Powered by blists - more mailing lists