Re: [PATCH 2/2] usb: typec: qcom-pmic-typec: register drm_bridge

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On 09/07/2023 14:25, Bryan O'Donoghue wrote:
On 09/07/2023 04:48, Dmitry Baryshkov wrote:
The current approach to handling DP on bridge-enabled platforms requires
a chain of DP bridges up to the USB-C connector. Register a last DRM
bridge for such chain.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
  drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 25 +++++++++++++++++++
  1 file changed, 25 insertions(+)

diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
index a905160dd860..ca832a28176e 100644
--- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
+++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
@@ -17,6 +17,9 @@
  #include <linux/usb/role.h>
  #include <linux/usb/tcpm.h>
  #include <linux/usb/typec_mux.h>
+
+#include <drm/drm_bridge.h>
+
  #include "qcom_pmic_typec_pdphy.h"
  #include "qcom_pmic_typec_port.h"
@@ -33,6 +36,7 @@ struct pmic_typec {
      struct pmic_typec_port    *pmic_typec_port;
      bool            vbus_enabled;
      struct mutex        lock;        /* VBUS state serialization */
+    struct drm_bridge    bridge;
  };
  #define tcpc_to_tcpm(_tcpc_) container_of(_tcpc_, struct pmic_typec, tcpc) @@ -146,6 +150,16 @@ static int qcom_pmic_typec_init(struct tcpc_dev *tcpc)
      return 0;
  }
+static int qcom_pmic_typec_attach(struct drm_bridge *bridge,
+                     enum drm_bridge_attach_flags flags)
+{
+    return flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR ? 0 : -EINVAL;
+}

Should that be -ENODEV instead ?

No. This bridge doesn't implement older bridge API, where the bridge had to create drm_connector itself. This implementation requires DRM_BRIDGE_ATTACH_NO_CONNECTOR and it is invalid to call it without this flag. Other bridges which have been converted to DRM_BRIDGE_ATTACH_NO_CONNECTOR implement the same semantics.


+
+static const struct drm_bridge_funcs qcom_pmic_typec_bridge_funcs = {
+    .attach = qcom_pmic_typec_attach,
+};
+
  static int qcom_pmic_typec_probe(struct platform_device *pdev)
  {
      struct pmic_typec *tcpm;
@@ -208,6 +222,17 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev)
      mutex_init(&tcpm->lock);
      platform_set_drvdata(pdev, tcpm);
+    tcpm->bridge.funcs = &qcom_pmic_typec_bridge_funcs;
+#if CONFIG_OF
+    tcpm->bridge.of_node = of_get_child_by_name(dev->of_node, "connector");
+#endif
+    tcpm->bridge.ops = DRM_BRIDGE_OP_HPD;
+    tcpm->bridge.type = DRM_MODE_CONNECTOR_USB;
+
+    ret = devm_drm_bridge_add(dev, &tcpm->bridge);

I think you need to either

Kconfig + depends on DRM

or

#if CONFIG_DRM

I guess I'm too used to always having DRM. This will need both Kconfig and source code parts. Will fix it in v2.


https://www.spinics.net/lists/kernel/msg4773470.html

Kconfig for preference

---
bod

--
With best wishes
Dmitry




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