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Message-ID: <456136f5-1e4d-3866-603f-16f308f06028@quicinc.com>
Date: Tue, 3 Oct 2023 10:15:57 -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 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)
>
>> +
>> + 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.
are you mean dropping this line?
>> +
>> + 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.
Are you means moving this function to header file?
>
>
>> +{
>> + 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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