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Message-ID: <520c3a22-4e16-4346-a20c-26adbc6bc0d6@linaro.org>
Date: Fri, 6 Oct 2023 14:58:55 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>,
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
Cc: 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 v5 7/7] drm/msm/dp: move of_dp_aux_populate_bus() to eDP
probe()
On 04/10/2023 19:27, Kuogee Hsieh 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 v5:
> -- inline dp_display_auxbus_population() and delete it
>
> 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 | 59 +++++++++++++++----------------------
> 2 files changed, 51 insertions(+), 42 deletions(-)
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
> index 10b6eeb..03f4951 100644
> --- a/drivers/gpu/drm/msm/dp/dp_aux.c
> +++ b/drivers/gpu/drm/msm/dp/dp_aux.c
> @@ -479,7 +479,6 @@ 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) {
> @@ -487,12 +486,7 @@ 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);
> @@ -507,6 +501,21 @@ 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);
> +
> + return ret;
> +}
> +
> struct drm_dp_aux *dp_aux_get(struct device *dev, struct dp_catalog *catalog,
> bool is_edp)
> {
> @@ -530,6 +539,17 @@ 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().
> + */
> + 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 79e56d9..df15145 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1207,6 +1207,17 @@ 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);
> +
> + return rc;
> +}
> +
> static int dp_display_probe(struct platform_device *pdev)
> {
> int rc = 0;
> @@ -1272,10 +1283,18 @@ static int dp_display_probe(struct platform_device *pdev)
> if (rc)
> goto err;
>
> - rc = component_add(&pdev->dev, &dp_display_comp_ops);
> - if (rc) {
> - DRM_ERROR("component add failed, rc=%d\n", rc);
> - goto err;
> + if (dp->dp_display.is_edp) {
> + rc = devm_of_dp_aux_populate_bus(dp->aux, dp_auxbus_done_probe);
> + if (rc) {
> + DRM_ERROR("eDP auxbus population failed, rc=%d\n", rc);
> + goto err;
> + }
> + } else {
> + rc = component_add(&pdev->dev, &dp_display_comp_ops);
> + if (rc) {
> + DRM_ERROR("component add failed, rc=%d\n", rc);
> + goto err;
> + }
> }
>
> return rc;
> @@ -1291,7 +1310,6 @@ static int dp_display_remove(struct platform_device *pdev)
>
> component_del(&pdev->dev, &dp_display_comp_ops);
> dp_display_deinit_sub_modules(dp);
> -
Nit: irrelevant to this patch.
> platform_set_drvdata(pdev, NULL);
>
> return 0;
> @@ -1388,29 +1406,8 @@ 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
> @@ -1423,17 +1420,9 @@ 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;
> }
>
--
With best wishes
Dmitry
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