Re: [PATCH v4 8/8] drm/msm/dp: move of_dp_aux_populate_bus() to eDP probe()
From: Kuogee Hsieh
Date: Tue Oct 03 2023 - 16:18:43 EST
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@xxxxxxxxxxx> 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@xxxxxxxxxxx>
---
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