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Date: Tue, 3 Oct 2023 13:18:22 -0700
From: Kuogee Hsieh <quic_khsieh@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
<sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
<vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
<agross@...nel.org>, <andersson@...nel.org>,
<quic_abhinavk@...cinc.com>, <quic_jesszhan@...cinc.com>,
<quic_sbillaka@...cinc.com>, <marijn.suijten@...ainline.org>,
<freedreno@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 8/8] drm/msm/dp: move of_dp_aux_populate_bus() to eDP
probe()
On 10/3/2023 10:56 AM, Dmitry Baryshkov wrote:
> On 03/10/2023 20:25, Kuogee Hsieh wrote:
>>
>> On 9/27/2023 2:57 PM, Dmitry Baryshkov wrote:
>>> On Wed, 27 Sept 2023 at 23:54, Kuogee Hsieh
>>> <quic_khsieh@...cinc.com> wrote:
>>>> Currently eDP population is done at msm_dp_modeset_init() which happen
>>>> at binding time. Move eDP population to be done at display probe time
>>>> so that probe deferral cases can be handled effectively.
>>>> wait_for_hpd_asserted callback is added during drm_dp_aux_init()
>>>> to ensure eDP's HPD is up before proceeding eDP population.
>>>>
>>>> Changes in v4:
>>>> -- delete duplicate initialize code to dp_aux before
>>>> drm_dp_aux_register()
>>>> -- delete of_get_child_by_name(dev->of_node, "aux-bus") and inline
>>>> the function
>>>> -- not initialize rc = 0
>>>>
>>>> Changes in v3:
>>>> -- add done_probing callback into devm_of_dp_aux_populate_bus()
>>>>
>>>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>>>> ---
>>>> drivers/gpu/drm/msm/dp/dp_aux.c | 34 ++++++++++++++----
>>>> drivers/gpu/drm/msm/dp/dp_display.c | 69
>>>> ++++++++++++++++++-------------------
>>>> 2 files changed, 60 insertions(+), 43 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c
>>>> b/drivers/gpu/drm/msm/dp/dp_aux.c
>>>> index 22eb774..425b5c5 100644
>>>> --- a/drivers/gpu/drm/msm/dp/dp_aux.c
>>>> +++ b/drivers/gpu/drm/msm/dp/dp_aux.c
>>>> @@ -480,7 +480,6 @@ void dp_aux_deinit(struct drm_dp_aux *dp_aux)
>>>>
>>>> int dp_aux_register(struct drm_dp_aux *dp_aux)
>>>> {
>>>> - struct dp_aux_private *aux;
>>>> int ret;
>>>>
>>>> if (!dp_aux) {
>>>> @@ -488,12 +487,7 @@ int dp_aux_register(struct drm_dp_aux *dp_aux)
>>>> return -EINVAL;
>>>> }
>>>>
>>>> - aux = container_of(dp_aux, struct dp_aux_private, dp_aux);
>>>> -
>>>> - aux->dp_aux.name = "dpu_dp_aux";
>>>> - aux->dp_aux.dev = aux->dev;
>>>> - aux->dp_aux.transfer = dp_aux_transfer;
>>>> - ret = drm_dp_aux_register(&aux->dp_aux);
>>>> + ret = drm_dp_aux_register(dp_aux);
>>>> if (ret) {
>>>> DRM_ERROR("%s: failed to register drm aux: %d\n",
>>>> __func__,
>>>> ret);
>>>> @@ -508,6 +502,21 @@ void dp_aux_unregister(struct drm_dp_aux *dp_aux)
>>>> drm_dp_aux_unregister(dp_aux);
>>>> }
>>>>
>>>> +static int dp_wait_hpd_asserted(struct drm_dp_aux *dp_aux,
>>>> + unsigned long wait_us)
>>>> +{
>>>> + int ret;
>>>> + struct dp_aux_private *aux;
>>>> +
>>>> + aux = container_of(dp_aux, struct dp_aux_private, dp_aux);
>>>> +
>>>> + pm_runtime_get_sync(aux->dev);
>>>> + ret = dp_catalog_aux_wait_for_hpd_connect_state(aux->catalog);
>>>> + pm_runtime_put_sync(aux->dev);
>>> Ok, so here you have used put_sync instead of autosuspend. Can we have
>>> some uniformity? (I'd prefer to see put_sync or just put everywhere)
>>
>>
>> my point is,
>>
>> since display is user interface,
>>
>> if there has any inputs before timer expire then there is no reason
>> to execute pm_runtime_suspend().
>>
>> otherwise pm_runtime_suspend() should be executed.
>>
>> Therefore I used autosuspend at aux_transfer() an
>> ddp_bridge_atomic_post_disable().
>>
>> here is not related to user interface so that i use put_sysn() directly.
>>
>> is my point make sense?
>>
>> or should I drop all autosuspend and replace them with put_sync()?
>
> This was my question from the beginning: what was the reason for using
> autosuspend? Did it bring any sensible improvement in the disable &
> reenable path?
ok, i got your point.
1) I will use put_sync() at dp_bridge_atomic_dsiable() and
dp_bridge_hpd_disable() instead of put_autosuspend().
2) keep pm_runtime_put_autosuspend() at dp_aux_transfer().
Is this good?
>
>>
>>
>>>
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> struct drm_dp_aux *dp_aux_get(struct device *dev, struct
>>>> dp_catalog *catalog,
>>>> bool is_edp)
>>>> {
>>>> @@ -531,6 +540,17 @@ struct drm_dp_aux *dp_aux_get(struct device
>>>> *dev, struct dp_catalog *catalog,
>>>> aux->catalog = catalog;
>>>> aux->retry_cnt = 0;
>>>>
>>>> + /*
>>>> + * Use the drm_dp_aux_init() to use the aux adapter
>>>> + * before registering aux with the DRM device so that
>>>> + * msm edp panel can be detected by generic_dep_panel_probe().
>>> eDP, AUX, generic_edp_panel_probe().
>>>
>>>> + */
>>>> + aux->dp_aux.name = "dpu_dp_aux";
>>>> + aux->dp_aux.dev = dev;
>>>> + aux->dp_aux.transfer = dp_aux_transfer;
>>>> + aux->dp_aux.wait_hpd_asserted = dp_wait_hpd_asserted;
>>>> + drm_dp_aux_init(&aux->dp_aux);
>>>> +
>>>> return &aux->dp_aux;
>>>> }
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
>>>> b/drivers/gpu/drm/msm/dp/dp_display.c
>>>> index 711d262..9a2b403 100644
>>>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>>>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>>>> @@ -1203,6 +1203,28 @@ static const struct msm_dp_desc
>>>> *dp_display_get_desc(struct platform_device *pde
>>>> return NULL;
>>>> }
>>>>
>>>> +static int dp_auxbus_done_probe(struct drm_dp_aux *aux)
>>>> +{
>>>> + int rc;
>>>> +
>>>> + rc = component_add(aux->dev, &dp_display_comp_ops);
>>>> + if (rc)
>>>> + DRM_ERROR("eDP component add failed, rc=%d\n", rc);
>>> drop.
>>>
>>>> +
>>>> + return rc;
>>>> +}
>>>> +
>>>> +static inline int dp_display_auxbus_population(struct
>>>> dp_display_private *dp)
>>> It's not `population`. It is just `populate`.
>>>
>>> Also please inline this function.
>>>
>>>
>>>> +{
>>>> + int ret;
>>>> +
>>>> + ret = devm_of_dp_aux_populate_bus(dp->aux,
>>>> dp_auxbus_done_probe);
>>>> + if (ret == -ENODEV)
>>>> + DRM_ERROR("aux-bus not found\n");
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> static int dp_display_probe(struct platform_device *pdev)
>>>> {
>>>> int rc = 0;
>>>> @@ -1271,10 +1293,16 @@ static int dp_display_probe(struct
>>>> platform_device *pdev)
>>>> if (rc)
>>>> return rc;
>>>>
>>>> - rc = component_add(&pdev->dev, &dp_display_comp_ops);
>>>> - if (rc) {
>>>> - DRM_ERROR("component add failed, rc=%d\n", rc);
>>>> - dp_display_deinit_sub_modules(dp);
>>>> + if (dp->dp_display.is_edp) {
>>>> + rc = dp_display_auxbus_population(dp);
>>>> + if (rc)
>>>> + DRM_ERROR("eDP auxbus population failed,
>>>> rc=%d\n", rc);
>>>> + } else {
>>>> + rc = component_add(&pdev->dev, &dp_display_comp_ops);
>>>> + if (rc) {
>>>> + DRM_ERROR("component add failed, rc=%d\n",
>>>> rc);
>>>> + dp_display_deinit_sub_modules(dp);
>>>> + }
>>>> }
>>>>
>>>> return rc;
>>>> @@ -1285,8 +1313,6 @@ static int dp_display_remove(struct
>>>> platform_device *pdev)
>>>> struct dp_display_private *dp =
>>>> dev_get_dp_display_private(&pdev->dev);
>>>>
>>>> component_del(&pdev->dev, &dp_display_comp_ops);
>>>> - dp_display_deinit_sub_modules(dp);
>>>> -
>>>> platform_set_drvdata(pdev, NULL);
>>>>
>>>> dp_display_deinit_sub_modules(dp);
>>>> @@ -1385,29 +1411,8 @@ static int dp_display_get_next_bridge(struct
>>>> msm_dp *dp)
>>>> {
>>>> int rc;
>>>> struct dp_display_private *dp_priv;
>>>> - struct device_node *aux_bus;
>>>> - struct device *dev;
>>>>
>>>> dp_priv = container_of(dp, struct dp_display_private,
>>>> dp_display);
>>>> - dev = &dp_priv->pdev->dev;
>>>> - aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
>>>> -
>>>> - if (aux_bus && dp->is_edp) {
>>>> - /*
>>>> - * The code below assumes that the panel will
>>>> finish probing
>>>> - * by the time devm_of_dp_aux_populate_ep_devices()
>>>> returns.
>>>> - * This isn't a great assumption since it will fail
>>>> if the
>>>> - * panel driver is probed asynchronously but is the
>>>> best we
>>>> - * can do without a bigger driver reorganization.
>>>> - */
>>>> - rc = of_dp_aux_populate_bus(dp_priv->aux, NULL);
>>>> - of_node_put(aux_bus);
>>>> - if (rc)
>>>> - goto error;
>>>> - } else if (dp->is_edp) {
>>>> - DRM_ERROR("eDP aux_bus not found\n");
>>>> - return -ENODEV;
>>>> - }
>>>>
>>>> /*
>>>> * External bridges are mandatory for eDP interfaces: one
>>>> has to
>>>> @@ -1420,17 +1425,9 @@ static int dp_display_get_next_bridge(struct
>>>> msm_dp *dp)
>>>> if (!dp->is_edp && rc == -ENODEV)
>>>> return 0;
>>>>
>>>> - if (!rc) {
>>>> + if (!rc)
>>>> dp->next_bridge = dp_priv->parser->next_bridge;
>>>> - return 0;
>>>> - }
>>>>
>>>> -error:
>>>> - if (dp->is_edp) {
>>>> - of_dp_aux_depopulate_bus(dp_priv->aux);
>>>> - dp_display_host_phy_exit(dp_priv);
>>>> - dp_display_host_deinit(dp_priv);
>>>> - }
>>>> return rc;
>>>> }
>>>>
>>>> --
>>>> 2.7.4
>>>>
>>>
>
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