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In-Reply-To: <22c1b098-ae28-5c0d-c1d0-2d09a5a5c1c0@quicinc.com>
From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date:   Fri, 6 Oct 2023 23:54:09 +0300
Message-ID: <CAA8EJpoK=XgO8zCcnTvFAPQRfWUghEOv-v2ktya9E=GOqW0fow@mail.gmail.com>
Subject: Re: [PATCH v5 5/7] drm/msm/dp: incorporate pm_runtime framework into
 DP driver
To:     Kuogee Hsieh <quic_khsieh@quicinc.com>
Cc:     dri-devel@lists.freedesktop.org, robdclark@gmail.com,
        sean@poorly.run, swboyd@chromium.org, dianders@chromium.org,
        vkoul@kernel.org, daniel@ffwll.ch, airlied@gmail.com,
        agross@kernel.org, andersson@kernel.org, quic_abhinavk@quicinc.com,
        quic_jesszhan@quicinc.com, quic_sbillaka@quicinc.com,
        marijn.suijten@somainline.org, freedreno@lists.freedesktop.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Fri, 6 Oct 2023 at 23:44, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
>
> On 10/6/2023 11:04 AM, Dmitry Baryshkov wrote:
> > On 06/10/2023 19:42, Kuogee Hsieh wrote:
> >>
> >> On 10/6/2023 4:56 AM, Dmitry Baryshkov wrote:
> >>> On 04/10/2023 19:26, Kuogee Hsieh wrote:
> >>>> Currently DP driver is executed independent of PM runtime framework.
> >>>> This leads msm eDP panel can not being detected by edp_panel driver
> >>>> during
> >>>> generic_edp_panel_probe() due to AUX DPCD read failed at edp panel
> >>>> driver.
> >>>> Incorporate PM runtime framework into DP driver so that host
> >>>> controller's
> >>>> power and clocks are enable/disable through PM runtime mechanism.
> >>>> Once PM runtime framework is incorporated into DP driver, waking up
> >>>> device
> >>>> from power up path is not necessary. Hence remove it.
> >>>>
> >>>> After incorporating pm_runtime framework into eDP/DP driver,
> >>>> dp_pm_suspend()
> >>>> to handle power off both DP phy and controller during suspend and
> >>>> dp_pm_resume() to handle power on both DP phy and controller during
> >>>> resume
> >>>> are not necessary. Therefore both dp_pm_suspend() and
> >>>> dp_pm_resume() are
> >>>> dropped and replace with dp_pm_runtime_suspend() and
> >>>> dp_pm_runtime_resume()
> >>>> respectively.
> >>>>
> >>>> Changes in v5:
> >>>> -- remove pm_runtime_put_autosuspend feature, use
> >>>> pm_runtime_put_sync() directly
> >>>> -- squash add pm_runtime_force_suspend()/resume() patch into this
> >>>> patch
> >>>
> >>> Ok, this is much better now. Thank you!
> >>>
> >>>>
> >>>> Changes in v4:
> >>>> -- reworded commit text to explain why pm_framework is required for
> >>>> edp panel
> >>>> -- reworded commit text to explain autosuspend is choiced
> >>>> -- delete EV_POWER_PM_GET and PM_EV_POWER_PUT from changes #3
> >>>> -- delete dp_display_pm_get() and dp_display_pm_Put() from changes #3
> >>>> -- return value from pm_runtime_resume_and_get() directly
> >>>> -- check return value of devm_pm_runtime_enable()
> >>>> -- delete pm_runtime_xxx from dp_display_remove()
> >>>> -- drop dp_display_host_init() from EV_HPD_INIT_SETUP
> >>>> -- drop both dp_pm_prepare() and dp_pm_compete() from this change
> >>>> -- delete ST_SUSPENDED state
> >>>> -- rewording commit text to add more details regrading the purpose
> >>>>     of this change
> >>>>
> >>>> Changes in v3:
> >>>> -- incorporate removing pm_runtime_xx() from dp_pwer.c to this patch
> >>>> -- use pm_runtime_resume_and_get() instead of pm_runtime_get()
> >>>> -- error checking pm_runtime_resume_and_get() return value
> >>>> -- add EV_POWER_PM_GET and PM_EV_POWER_PUT to handle HPD_GPIO case
> >>>> -- replace dp_pm_suspend() with pm_runtime_force_suspend()
> >>>> -- replace dp_pm_resume() with pm_runtime_force_resume()
> >>>>
> >>>> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> >>>> Reported-by: kernel test robot <lkp@intel.com>
> >>>> ---
> >>>>   drivers/gpu/drm/msm/dp/dp_aux.c     |   5 ++
> >>>>   drivers/gpu/drm/msm/dp/dp_display.c | 166
> >>>> ++++++++++++------------------------
> >>>>   drivers/gpu/drm/msm/dp/dp_power.c   |  16 ----
> >>>>   drivers/gpu/drm/msm/dp/dp_power.h   |  11 ---
> >>>>   4 files changed, 59 insertions(+), 139 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c
> >>>> b/drivers/gpu/drm/msm/dp/dp_aux.c
> >>>> index 8e3b677..10b6eeb 100644
> >>>> --- a/drivers/gpu/drm/msm/dp/dp_aux.c
> >>>> +++ b/drivers/gpu/drm/msm/dp/dp_aux.c
> >>>> @@ -291,6 +291,10 @@ static ssize_t dp_aux_transfer(struct
> >>>> drm_dp_aux *dp_aux,
> >>>>           return -EINVAL;
> >>>>       }
> >>>>   +    ret = pm_runtime_resume_and_get(dp_aux->dev);
> >>>> +    if (ret)
> >>>> +        return  ret;
> >>>> +
> >>>>       mutex_lock(&aux->mutex);
> >>>>       if (!aux->initted) {
> >>>>           ret = -EIO;
> >>>> @@ -364,6 +368,7 @@ static ssize_t dp_aux_transfer(struct
> >>>> drm_dp_aux *dp_aux,
> >>>>     exit:
> >>>>       mutex_unlock(&aux->mutex);
> >>>> +    pm_runtime_put_sync(dp_aux->dev);
> >>>>         return ret;
> >>>>   }
> >>>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
> >>>> b/drivers/gpu/drm/msm/dp/dp_display.c
> >>>> index e4942fc..42efe148b 100644
> >>>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> >>>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> >>>> @@ -49,7 +49,6 @@ enum {
> >>>>       ST_CONNECTED,
> >>>>       ST_DISCONNECT_PENDING,
> >>>>       ST_DISPLAY_OFF,
> >>>> -    ST_SUSPENDED,
> >>>>   };
> >>>>     enum {
> >>>> @@ -310,15 +309,10 @@ static void dp_display_unbind(struct device
> >>>> *dev, struct device *master,
> >>>>       struct dp_display_private *dp = dev_get_dp_display_private(dev);
> >>>>       struct msm_drm_private *priv = dev_get_drvdata(master);
> >>>>   -    /* disable all HPD interrupts */
> >>>> -    if (dp->core_initialized)
> >>>> -        dp_catalog_hpd_config_intr(dp->catalog,
> >>>> DP_DP_HPD_INT_MASK, false);
> >>>> -
> >>>>       kthread_stop(dp->ev_tsk);
> >>>>         of_dp_aux_depopulate_bus(dp->aux);
> >>>>   -    dp_power_client_deinit(dp->power);
> >>>>       dp_unregister_audio_driver(dev, dp->audio);
> >>>>       dp_aux_unregister(dp->aux);
> >>>>       dp->drm_dev = NULL;
> >>>> @@ -559,7 +553,7 @@ static int dp_hpd_plug_handle(struct
> >>>> dp_display_private *dp, u32 data)
> >>>>       drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
> >>>>               dp->dp_display.connector_type, state);
> >>>>   -    if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
> >>>> +    if (state == ST_DISPLAY_OFF) {
> >>>>           mutex_unlock(&dp->event_mutex);
> >>>>           return 0;
> >>>>       }
> >>>> @@ -576,6 +570,14 @@ static int dp_hpd_plug_handle(struct
> >>>> dp_display_private *dp, u32 data)
> >>>>           return 0;
> >>>>       }
> >>>>   +    if (!dp->dp_display.is_edp) {
> >>>
> >>> Why?
> >>
> >> This is mainly for hpd_internal == false case (any possible way of
> >> delivering an HPD event)
> >>
> >> for both eDP and "hpd_internal == true" cases,
> >> pm_runtime_resume_and_get() had been called already.
> >>
> >> will it better? if it was  removed the condition
> >> (dp->dp_display.is_edp) check?
> >
> > Yes, this codepath seems generic.
> >
> >>
> >>>
> >>>> +        ret = pm_runtime_resume_and_get(&dp->pdev->dev);
> >>>> +        if (ret) {
> >>>> +            DRM_ERROR("failed to pm_runtime_resume\n");
> >>>> +            return ret;
> >>>> +        }
> >>>> +    }
> >>>> +
> >>>>       ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
> >>>>       if (ret) {    /* link train failed */
> >>>>           dp->hpd_state = ST_DISCONNECTED;
> >>>> @@ -658,6 +660,8 @@ static int dp_hpd_unplug_handle(struct
> >>>> dp_display_private *dp, u32 data)
> >>>>               dp->dp_display.connector_type, state);
> >>>>         /* uevent will complete disconnection part */
> >>>> +    if (!dp->dp_display.is_edp)
> >>>> +        pm_runtime_put_sync(&dp->pdev->dev);
> >>>>       mutex_unlock(&dp->event_mutex);
> >>>>       return 0;
> >>>>   }
> >>>> @@ -673,7 +677,7 @@ static int dp_irq_hpd_handle(struct
> >>>> dp_display_private *dp, u32 data)
> >>>>       drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
> >>>>               dp->dp_display.connector_type, state);
> >>>>   -    if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
> >>>> +    if (state == ST_DISPLAY_OFF) {
> >>>>           mutex_unlock(&dp->event_mutex);
> >>>>           return 0;
> >>>>       }
> >>>> @@ -1086,7 +1090,6 @@ static int hpd_event_thread(void *data)
> >>>>             switch (todo->event_id) {
> >>>>           case EV_HPD_INIT_SETUP:
> >>>> -            dp_display_host_init(dp_priv);
> >>>>               break;
> >>>>           case EV_HPD_PLUG_INT:
> >>>>               dp_hpd_plug_handle(dp_priv, todo->data);
> >>>> @@ -1264,6 +1267,10 @@ static int dp_display_probe(struct
> >>>> platform_device *pdev)
> >>>>         platform_set_drvdata(pdev, &dp->dp_display);
> >>>>   +    rc = devm_pm_runtime_enable(&pdev->dev);
> >>>> +    if (rc)
> >>>> +        goto err;
> >>>> +
> >>>>       rc = dp_display_request_irq(dp);
> >>>
> >>> Here we have a problem now. The device can be runtime suspended,
> >>> ceasing register access. However the IRQ enablement status is no
> >>> longer synchronised to the DP's runtime status. Thus, if for some
> >>> reason the IRQ handler is triggered, we can get unclocked register
> >>> access / sync error.
> >>>
> >>> Please correct me if I'm wrong, but I think that the request_irq
> >>> should also get the IRQF_NO_AUTOEN flag and the suspend / resume
> >>> paths should also have enable_irq() / disable_irq() calls.
> >>>
> >> got it.
> >>
> >>
> >>>>       if (rc)
> >>>>           goto err;
> >>>> @@ -1293,109 +1300,36 @@ static int dp_display_remove(struct
> >>>> platform_device *pdev)
> >>>>       return 0;
> >>>>   }
> >>>>   -static int dp_pm_resume(struct device *dev)
> >>>> +static int dp_pm_runtime_suspend(struct device *dev)
> >>>>   {
> >>>> -    struct platform_device *pdev = to_platform_device(dev);
> >>>> -    struct msm_dp *dp_display = platform_get_drvdata(pdev);
> >>>> -    struct dp_display_private *dp;
> >>>> -    int sink_count = 0;
> >>>> -
> >>>> -    dp = container_of(dp_display, struct dp_display_private,
> >>>> dp_display);
> >>>> -
> >>>> -    mutex_lock(&dp->event_mutex);
> >>>> -
> >>>> -    drm_dbg_dp(dp->drm_dev,
> >>>> -        "Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> >>>> -        dp->dp_display.connector_type, dp->core_initialized,
> >>>> -        dp->phy_initialized, dp_display->power_on);
> >>>> -
> >>>> -    /* start from disconnected state */
> >>>> -    dp->hpd_state = ST_DISCONNECTED;
> >>>> -
> >>>> -    /* turn on dp ctrl/phy */
> >>>> -    dp_display_host_init(dp);
> >>>> -
> >>>> -    if (dp_display->is_edp)
> >>>> -        dp_catalog_ctrl_hpd_enable(dp->catalog);
> >>>> -
> >>>> -    if (dp_catalog_link_is_connected(dp->catalog)) {
> >>>> -        /*
> >>>> -         * set sink to normal operation mode -- D0
> >>>> -         * before dpcd read
> >>>> -         */
> >>>> -        dp_display_host_phy_init(dp);
> >>>> -        dp_link_psm_config(dp->link, &dp->panel->link_info, false);
> >>>> -        sink_count = drm_dp_read_sink_count(dp->aux);
> >>>> -        if (sink_count < 0)
> >>>> -            sink_count = 0;
> >>>> +    struct dp_display_private *dp = dev_get_dp_display_private(dev);
> >>>>   +    if (dp->dp_display.is_edp) {
> >>>
> >>> Why is it only for eDP case?
> >>>
> >>> My expectation is that if the DP device is suspended, then the PHY
> >>> and the host parts are disabled. The driver, panel-edp / DP_AUX and
> >>> the DRM framework should take care of resuming the DP device at the
> >>> right time.
> >>>
> >> eDP and DP are implemented differently.
> >>
> >> for external DP case,
> >>
> >> 1) dp_pm_runtime_resume() only enable dp host.
> >>
> >> 2) at dp_bridge_hpd_enable(), enable hdp block only and have hpd irq
> >> enabled and start waiting for plugin interrupt.  but leave phy is not
> >> initialized.
> >>
> >> 3) DP phy is initialized at plugin interrupt handle at the time right
> >> before link training.
> >>
> >> for eDP case, hpd irq is always disable (no hpd irq required for eDP).
> >>
> >> 1) DP host, HDP block and phy are enabled (initialized) at same time
> >> at dp_pm_runtime_resume()
> >
> > Ack. thanks. If you can add this to the comment somewhere in the file,
> > that will be great. Also just for my understanding: The function
> > dp_catalog_ctrl_hpd_enable() only enables handling of the HPD pin, it
> > has no other side effects? So for the DP case if we have external HPD
> > events, we don't need to call it, correct?
>
> yes, this is correct.  dp_catalog_ctrl_hpd_enable() and
> dp_catalog_hpd_config_intr() are only for the case depend on hpd interrupts.

Thanks for the confirmation. Could you please add these details to a comment?

>
> >
> > Also, could you please add a followup patch that drop
> > dp_display->internal_hpd and always uses the same codepath for both
> > cases? Would that be a logical change after this series?
> ok, i will submit a patch to remove hpd_internal.

Thank you!

> >
> >
> >>            dp_display_host_phy_exit(dp);
> >>>> + dp_catalog_ctrl_hpd_disable(dp->catalog);
> >>>>       }
> >>>> -
> >>>> -    dp->link->sink_count = sink_count;
> >>>> -    /*
> >>>> -     * can not declared display is connected unless
> >>>> -     * HDMI cable is plugged in and sink_count of
> >>>> -     * dongle become 1
> >>>> -     * also only signal audio when disconnected
> >>>> -     */
> >>>> -    if (dp->link->sink_count) {
> >>>> -        dp->dp_display.link_ready = true;
> >>>> -    } else {
> >>>> -        dp->dp_display.link_ready = false;
> >>>> -        dp_display_handle_plugged_change(dp_display, false);
> >>>> -    }
> >>>> -
> >>>> -    drm_dbg_dp(dp->drm_dev,
> >>>> -        "After, type=%d sink=%d conn=%d core_init=%d phy_init=%d
> >>>> power=%d\n",
> >>>> -        dp->dp_display.connector_type, dp->link->sink_count,
> >>>> -        dp->dp_display.link_ready, dp->core_initialized,
> >>>> -        dp->phy_initialized, dp_display->power_on);
> >>>> -
> >>>> -    mutex_unlock(&dp->event_mutex);
> >>>> +    dp_display_host_deinit(dp);
> >>>>         return 0;
> >>>>   }
> >>>>   -static int dp_pm_suspend(struct device *dev)
> >>>> +static int dp_pm_runtime_resume(struct device *dev)
> >>>>   {
> >>>> -    struct platform_device *pdev = to_platform_device(dev);
> >>>> -    struct msm_dp *dp_display = platform_get_drvdata(pdev);
> >>>> -    struct dp_display_private *dp;
> >>>> -
> >>>> -    dp = container_of(dp_display, struct dp_display_private,
> >>>> dp_display);
> >>>> -
> >>>> -    mutex_lock(&dp->event_mutex);
> >>>> -
> >>>> -    drm_dbg_dp(dp->drm_dev,
> >>>> -        "Before, type=%d core_inited=%d  phy_inited=%d
> >>>> power_on=%d\n",
> >>>> -        dp->dp_display.connector_type, dp->core_initialized,
> >>>> -        dp->phy_initialized, dp_display->power_on);
> >>>> -
> >>>> -    /* mainlink enabled */
> >>>> -    if (dp_power_clk_status(dp->power, DP_CTRL_PM))
> >>>> -        dp_ctrl_off_link_stream(dp->ctrl);
> >>>> -
> >>>> -    dp_display_host_phy_exit(dp);
> >>>> -
> >>>> -    /* host_init will be called at pm_resume */
> >>>> -    dp_display_host_deinit(dp);
> >>>> -
> >>>> -    dp->hpd_state = ST_SUSPENDED;
> >>>> -
> >>>> -    drm_dbg_dp(dp->drm_dev,
> >>>> -        "After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
> >>>> -        dp->dp_display.connector_type, dp->core_initialized,
> >>>> -        dp->phy_initialized, dp_display->power_on);
> >>>> +    struct dp_display_private *dp = dev_get_dp_display_private(dev);
> >>>>   -    mutex_unlock(&dp->event_mutex);
> >>>> +    dp_display_host_init(dp);
> >>>> +    if (dp->dp_display.is_edp) {
> >>>
> >>> Why?
> >> Same as above comments.
> >
> > Ack
> >
> >>>
> >>>> + dp_catalog_ctrl_hpd_enable(dp->catalog);
> >>>> +        dp_display_host_phy_init(dp);
> >>>> +    }
> >>>>         return 0;
> >>>>   }
> >>>>     static const struct dev_pm_ops dp_pm_ops = {
> >>>> -    .suspend = dp_pm_suspend,
> >>>> -    .resume =  dp_pm_resume,
> >>>> +    SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend,
> >>>> dp_pm_runtime_resume, NULL)
> >>>> +    SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> >>>> +                                pm_runtime_force_resume)
> >>>>   };
> >>>>     static struct platform_driver dp_display_driver = {
> >>>> @@ -1478,10 +1412,6 @@ static int dp_display_get_next_bridge(struct
> >>>> msm_dp *dp)
> >>>>       aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
> >>>>         if (aux_bus && dp->is_edp) {
> >>>> -        dp_display_host_init(dp_priv);
> >>>> -        dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
> >>>> -        dp_display_host_phy_init(dp_priv);
> >>>> -
> >>>>           /*
> >>>>            * The code below assumes that the panel will finish probing
> >>>>            * by the time devm_of_dp_aux_populate_ep_devices() returns.
> >>>> @@ -1583,6 +1513,11 @@ void dp_bridge_atomic_enable(struct
> >>>> drm_bridge *drm_bridge,
> >>>>           dp_hpd_plug_handle(dp_display, 0);
> >>>>         mutex_lock(&dp_display->event_mutex);
> >>>> +    if (pm_runtime_resume_and_get(&dp_display->pdev->dev)) {
> >>>> +        DRM_ERROR("failed to pm_runtime_resume\n");
> >>>> +        mutex_unlock(&dp_display->event_mutex);
> >>>> +        return;
> >>>> +    }
> >>>>         state = dp_display->hpd_state;
> >>>>       if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
> >>>> @@ -1647,10 +1582,9 @@ void dp_bridge_atomic_post_disable(struct
> >>>> drm_bridge *drm_bridge,
> >>>>       mutex_lock(&dp_display->event_mutex);
> >>>>         state = dp_display->hpd_state;
> >>>> -    if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
> >>>> -        mutex_unlock(&dp_display->event_mutex);
> >>>> -        return;
> >>>> -    }
> >>>> +    if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
> >>>> +        drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
> >>>> +               dp->connector_type, state);
> >>>>         dp_display_disable(dp_display);
> >>>>   @@ -1663,6 +1597,8 @@ void dp_bridge_atomic_post_disable(struct
> >>>> drm_bridge *drm_bridge,
> >>>>       }
> >>>>         drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
> >>>> +
> >>>> +    pm_runtime_put_sync(&dp_display->pdev->dev);
> >>>>       mutex_unlock(&dp_display->event_mutex);
> >>>>   }
> >>>>   @@ -1702,6 +1638,12 @@ void dp_bridge_hpd_enable(struct
> >>>> drm_bridge *bridge)
> >>>>       struct dp_display_private *dp = container_of(dp_display,
> >>>> struct dp_display_private, dp_display);
> >>>>         mutex_lock(&dp->event_mutex);
> >>>> +    if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
> >>>> +        DRM_ERROR("failed to start power\n");
> >>>> +        mutex_unlock(&dp->event_mutex);
> >>>> +        return;
> >>>> +    }
> >>>> +
> >>>>       dp_catalog_ctrl_hpd_enable(dp->catalog);
> >>>>         /* enable HDP interrupts */
> >>>> @@ -1723,6 +1665,9 @@ void dp_bridge_hpd_disable(struct drm_bridge
> >>>> *bridge)
> >>>>       dp_catalog_ctrl_hpd_disable(dp->catalog);
> >>>>         dp_display->internal_hpd = false;
> >>>> +    dp->hpd_state = ST_DISCONNECTED;
> >>>
> >>> As I wrote in the comment to the previous series, this is incorrect.
> >>> The .hpd_disable() doesn't mean that the display gets disconnected.
> >>> Neither does .hpd_enable().
> >> ok,
> >>>
> >>>> +
> >>>> +    pm_runtime_put_sync(&dp->pdev->dev);
> >>>>       mutex_unlock(&dp->event_mutex);
> >>>>   }
> >>>>   @@ -1737,13 +1682,10 @@ void dp_bridge_hpd_notify(struct
> >>>> drm_bridge *bridge,
> >>>>       if (dp_display->internal_hpd)
> >>>>           return;
> >>>>   -    if (!dp->core_initialized) {
> >>>> -        drm_dbg_dp(dp->drm_dev, "not initialized\n");
> >>>> -        return;
> >>>> -    }
> >>>> -
> >>>> -    if (!dp_display->link_ready && status ==
> >>>> connector_status_connected)
> >>>> +    if (!dp_display->link_ready && status ==
> >>>> connector_status_connected) {
> >>>> +        dp->hpd_state = ST_DISCONNECTED;
> >>>>           dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
> >>>> -    else if (dp_display->link_ready && status ==
> >>>> connector_status_disconnected)
> >>>> +    } else if (dp_display->link_ready && status ==
> >>>> connector_status_disconnected) {
> >>>>           dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
> >>>> +    }
> >>>>   }
> >>>> diff --git a/drivers/gpu/drm/msm/dp/dp_power.c
> >>>> b/drivers/gpu/drm/msm/dp/dp_power.c
> >>>> index 5cb84ca..863c766 100644
> >>>> --- a/drivers/gpu/drm/msm/dp/dp_power.c
> >>>> +++ b/drivers/gpu/drm/msm/dp/dp_power.c
> >>>> @@ -152,20 +152,9 @@ int dp_power_client_init(struct dp_power
> >>>> *dp_power)
> >>>>         power = container_of(dp_power, struct dp_power_private,
> >>>> dp_power);
> >>>>   -    pm_runtime_enable(power->dev);
> >>>> -
> >>>>       return dp_power_clk_init(power);
> >>>>   }
> >>>>   -void dp_power_client_deinit(struct dp_power *dp_power)
> >>>> -{
> >>>> -    struct dp_power_private *power;
> >>>> -
> >>>> -    power = container_of(dp_power, struct dp_power_private,
> >>>> dp_power);
> >>>> -
> >>>> -    pm_runtime_disable(power->dev);
> >>>> -}
> >>>> -
> >>>>   int dp_power_init(struct dp_power *dp_power)
> >>>>   {
> >>>>       int rc = 0;
> >>>> @@ -173,11 +162,7 @@ int dp_power_init(struct dp_power *dp_power)
> >>>>         power = container_of(dp_power, struct dp_power_private,
> >>>> dp_power);
> >>>>   -    pm_runtime_get_sync(power->dev);
> >>>> -
> >>>>       rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
> >>>> -    if (rc)
> >>>> -        pm_runtime_put_sync(power->dev);
> >>>>         return rc;
> >>>>   }
> >>>> @@ -189,7 +174,6 @@ int dp_power_deinit(struct dp_power *dp_power)
> >>>>       power = container_of(dp_power, struct dp_power_private,
> >>>> dp_power);
> >>>>         dp_power_clk_enable(dp_power, DP_CORE_PM, false);
> >>>> -    pm_runtime_put_sync(power->dev);
> >>>>       return 0;
> >>>>   }
> >>>>   diff --git a/drivers/gpu/drm/msm/dp/dp_power.h
> >>>> b/drivers/gpu/drm/msm/dp/dp_power.h
> >>>> index a3dec20..55ada51 100644
> >>>> --- a/drivers/gpu/drm/msm/dp/dp_power.h
> >>>> +++ b/drivers/gpu/drm/msm/dp/dp_power.h
> >>>> @@ -81,17 +81,6 @@ int dp_power_clk_enable(struct dp_power *power,
> >>>> enum dp_pm_type pm_type,
> >>>>   int dp_power_client_init(struct dp_power *power);
> >>>>     /**
> >>>> - * dp_power_clinet_deinit() - de-initialize clock and regulator
> >>>> modules
> >>>> - *
> >>>> - * @power: instance of power module
> >>>> - * return: 0 for success, error for failure.
> >>>> - *
> >>>> - * This API will de-initialize the DisplayPort's clocks and regulator
> >>>> - * modules.
> >>>> - */
> >>>> -void dp_power_client_deinit(struct dp_power *power);
> >>>> -
> >>>> -/**
> >>>>    * dp_power_get() - configure and get the DisplayPort power
> >>>> module data
> >>>>    *
> >>>>    * @parser: instance of parser module
> >>>
> >


-- 
With best wishes
Dmitry