From: Pin-yen Lin <treapking@chromium.org>
To: Andrzej Hajda <andrzej.hajda@intel.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Robert Foss <rfoss@kernel.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Daniel Scally <djrscally@gmail.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Prashant Malani <pmalani@chromium.org>,
Benson Leung <bleung@chromium.org>,
Guenter Roeck <groeck@chromium.org>
Cc: "Xin Ji" <xji@analogixsemi.com>, "Marek Vasut" <marex@denx.de>,
"Hsin-Yi Wang" <hsinyi@chromium.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"AngeloGioacchino Del Regno"
<angelogioacchino.delregno@collabora.com>,
"Lyude Paul" <lyude@redhat.com>,
devicetree@vger.kernel.org, "Stephen Boyd" <swboyd@chromium.org>,
dri-devel@lists.freedesktop.org, linux-acpi@vger.kernel.org,
chrome-platform@lists.linux.dev,
"Nícolas F . R . A . Prado" <nfraprado@collabora.com>,
"Javier Martinez Canillas" <javierm@redhat.com>,
"Pin-yen Lin" <treapking@chromium.org>,
linux-kernel@vger.kernel.org,
"Alex Deucher" <alexander.deucher@amd.com>,
"David Zhang" <dingchen.zhang@amd.com>,
"Dmitry Baryshkov" <dmitry.baryshkov@linaro.org>,
"Douglas Anderson" <dianders@chromium.org>,
"Imre Deak" <imre.deak@intel.com>,
"Jani Nikula" <jani.nikula@intel.com>,
"Linus Walleij" <linus.walleij@linaro.org>,
YueHaibing <yuehaibing@huawei.com>
Subject: [PATCH v15 03/10] drm/display: Add Type-C switch helpers
Date: Fri, 31 Mar 2023 17:11:38 +0800 [thread overview]
Message-ID: <20230331091145.737305-4-treapking@chromium.org> (raw)
In-Reply-To: <20230331091145.737305-1-treapking@chromium.org>
Add helpers to register and unregister Type-C "switches" for bridges
capable of switching their output between two downstream devices.
The helper registers USB Type-C mode switches when the "mode-switch"
and the "reg" properties are available in Device Tree.
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
---
Changes in v15:
- Change the struct definition order for the Type-C switch helpers
- Fix style issues
- Updated the docs for the return value
- Updated the description in Kconfig
- Use dev_name as the typec_mux name
Changes in v14:
- Introduce a new Kconfig because it didn't build when CONFIG_TYPEC=m
- Add comments about devm_* usage
- Fix style issues
Changes in v13:
- Add typec_mode_switch_node_count helper
- Fix style issues
Changes in v12:
- Add fwnode_for_each_typec_mode_switch macro
- Remove a duplicated dmesg in the helper
- Used IS_REACHABLE instead to guard the function signatures
Changes in v11:
- Use fwnode helpers instead of DT
- Moved the helpers to a new file
- Use "reg" instead of "data-lanes" to determine the port number
- Dropped collected tags due to new changes
Changes in v10:
- Collected Reviewed-by and Tested-by tags
- Replaced "void *" with "typec_mux_set_fn_t" for mux_set callbacks
- Print out the node name when errors on parsing DT
- Use dev_dbg instead of dev_warn when no Type-C switch nodes available
- Made the return path of drm_dp_register_mode_switch clearer
Changes in v8:
- Fixed the build issue when CONFIG_TYPEC=m
- Fixed some style issues
Changes in v7:
- Extracted the common codes to a helper function
- New in v7
drivers/gpu/drm/display/Kconfig | 8 ++
drivers/gpu/drm/display/Makefile | 2 +
drivers/gpu/drm/display/drm_dp_typec_helper.c | 107 ++++++++++++++++++
include/drm/display/drm_dp_helper.h | 46 ++++++++
4 files changed, 163 insertions(+)
create mode 100644 drivers/gpu/drm/display/drm_dp_typec_helper.c
diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig
index 09712b88a5b8..4eaf00380a1f 100644
--- a/drivers/gpu/drm/display/Kconfig
+++ b/drivers/gpu/drm/display/Kconfig
@@ -29,6 +29,14 @@ config DRM_DISPLAY_HDMI_HELPER
help
DRM display helpers for HDMI.
+config DRM_DISPLAY_DP_TYPEC_HELPER
+ def_bool y
+ depends on DRM_DISPLAY_HELPER
+ depends on DRM_DISPLAY_HELPER=TYPEC || TYPEC=y
+ help
+ Choose this option to enable helpers for registering USB Type-C
+ switches when USB Type-C DisplayPort Alternate mode is used.
+
config DRM_DP_AUX_CHARDEV
bool "DRM DP AUX Interface"
depends on DRM && DRM_DISPLAY_HELPER
diff --git a/drivers/gpu/drm/display/Makefile b/drivers/gpu/drm/display/Makefile
index 17ac4a1006a8..2202a6aea38e 100644
--- a/drivers/gpu/drm/display/Makefile
+++ b/drivers/gpu/drm/display/Makefile
@@ -8,6 +8,8 @@ drm_display_helper-$(CONFIG_DRM_DISPLAY_DP_HELPER) += \
drm_dp_helper.o \
drm_dp_mst_topology.o \
drm_dsc_helper.o
+drm_display_helper-$(CONFIG_DRM_DISPLAY_DP_TYPEC_HELPER) += \
+ drm_dp_typec_helper.o
drm_display_helper-$(CONFIG_DRM_DISPLAY_HDCP_HELPER) += drm_hdcp_helper.o
drm_display_helper-$(CONFIG_DRM_DISPLAY_HDMI_HELPER) += \
drm_hdmi_helper.o \
diff --git a/drivers/gpu/drm/display/drm_dp_typec_helper.c b/drivers/gpu/drm/display/drm_dp_typec_helper.c
new file mode 100644
index 000000000000..48c1bbf57b2d
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_dp_typec_helper.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/usb/typec_mux.h>
+#include <drm/display/drm_dp_helper.h>
+
+static int drm_dp_register_mode_switch(struct device *dev,
+ struct fwnode_handle *fwnode,
+ struct drm_dp_typec_switch_desc *switch_desc,
+ void *data, typec_mux_set_fn_t mux_set)
+{
+ struct drm_dp_typec_port_data *port_data;
+ struct typec_mux_desc mux_desc = {};
+ char name[32];
+ u32 port_num;
+ int ret;
+
+ ret = fwnode_property_read_u32(fwnode, "reg", &port_num);
+ if (ret) {
+ dev_err(dev, "Failed to read reg property: %d\n", ret);
+ return ret;
+ }
+
+ port_data = &switch_desc->typec_ports[port_num];
+ port_data->data = data;
+ port_data->port_num = port_num;
+ port_data->fwnode = fwnode;
+ mux_desc.fwnode = fwnode;
+ mux_desc.drvdata = port_data;
+ snprintf(name, sizeof(name), "%s-%u", dev_name(dev), port_num);
+ mux_desc.name = name;
+ mux_desc.set = mux_set;
+
+ port_data->typec_mux = typec_mux_register(dev, &mux_desc);
+ ret = PTR_ERR_OR_ZERO(port_data->typec_mux);
+ if (ret)
+ dev_err(dev, "Mode switch register for port %d failed: %d\n",
+ port_num, ret);
+
+ return ret;
+}
+
+/**
+ * drm_dp_register_typec_switches() - register Type-C switches
+ * @dev: Device that registers Type-C switches
+ * @port: Device node for the switch
+ * @switch_desc: A Type-C switch descriptor
+ * @data: Private data for the switches
+ * @mux_set: Callback function for typec_mux_set
+ *
+ * This function registers USB Type-C switches for DP bridges that can switch
+ * the output signal between their output pins. This function uses devm_kcalloc
+ * to allocate memory, so it is expected to only call this in the driver probe
+ * functions.
+ *
+ * Currently only mode switches are implemented, and the function assumes the
+ * given @port device node has endpoints with "mode-switch" property.
+ * The port number is determined by the "reg" property of the endpoint.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_dp_register_typec_switches(struct device *dev, struct fwnode_handle *port,
+ struct drm_dp_typec_switch_desc *switch_desc,
+ void *data, typec_mux_set_fn_t mux_set)
+{
+ struct fwnode_handle *sw;
+ int ret;
+
+ switch_desc->num_typec_switches = typec_mode_switch_node_count(port);
+ if (!switch_desc->num_typec_switches) {
+ dev_dbg(dev, "No Type-C switches node found\n");
+ return 0;
+ }
+
+ switch_desc->typec_ports = devm_kcalloc(dev, switch_desc->num_typec_switches,
+ sizeof(*switch_desc->typec_ports),
+ GFP_KERNEL);
+ if (!switch_desc->typec_ports)
+ return -ENOMEM;
+
+ /* Register switches for each connector. */
+ for_each_typec_mode_switch_node(port, sw) {
+ ret = drm_dp_register_mode_switch(dev, sw, switch_desc, data, mux_set);
+ if (ret)
+ goto err_unregister_typec_switches;
+ }
+
+ return 0;
+
+err_unregister_typec_switches:
+ fwnode_handle_put(sw);
+ drm_dp_unregister_typec_switches(switch_desc);
+ return ret;
+}
+EXPORT_SYMBOL(drm_dp_register_typec_switches);
+
+/**
+ * drm_dp_unregister_typec_switches() - unregister Type-C switches
+ * @switch_desc: A Type-C switch descriptor
+ */
+void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc)
+{
+ unsigned int i;
+
+ for (i = 0; i < switch_desc->num_typec_switches; i++)
+ typec_mux_unregister(switch_desc->typec_ports[i].typec_mux);
+}
+EXPORT_SYMBOL(drm_dp_unregister_typec_switches);
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
index ab55453f2d2c..8c2d50c05335 100644
--- a/include/drm/display/drm_dp_helper.h
+++ b/include/drm/display/drm_dp_helper.h
@@ -25,6 +25,7 @@
#include <linux/delay.h>
#include <linux/i2c.h>
+#include <linux/usb/typec_mux.h>
#include <drm/display/drm_dp.h>
#include <drm/drm_connector.h>
@@ -763,4 +764,49 @@ bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZ
const u8 port_cap[4], u8 color_spc);
int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc);
+struct drm_dp_typec_port_data {
+ struct typec_mux_dev *typec_mux;
+ struct fwnode_handle *fwnode;
+ void *data;
+ int port_num;
+};
+
+struct drm_dp_typec_switch_desc {
+ struct drm_dp_typec_port_data *typec_ports;
+ int num_typec_switches;
+};
+
+#define for_each_typec_mode_switch_node(port, sw) \
+ fwnode_for_each_child_node((port), (sw)) \
+ for_each_if(fwnode_property_present((sw), "mode-switch"))
+
+static inline unsigned int typec_mode_switch_node_count(struct fwnode_handle *port)
+{
+ struct fwnode_handle *sw;
+ unsigned int count = 0;
+
+ for_each_typec_mode_switch_node(port, sw)
+ count++;
+
+ return count;
+}
+
+#ifdef CONFIG_DRM_DISPLAY_DP_TYPEC_HELPER
+void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc);
+int drm_dp_register_typec_switches(struct device *dev, struct fwnode_handle *port,
+ struct drm_dp_typec_switch_desc *switch_desc,
+ void *data, typec_mux_set_fn_t mux_set);
+#else
+static inline void drm_dp_unregister_typec_switches(struct drm_dp_typec_switch_desc *switch_desc)
+{
+}
+static inline int drm_dp_register_typec_switches(
+ struct device *dev, struct fwnode_handle *port,
+ struct drm_dp_typec_switch_desc *switch_desc, void *data,
+ typec_mux_set_fn_t mux_set)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
#endif /* _DRM_DP_HELPER_H_ */
--
2.40.0.348.gf938b09366-goog
next prev parent reply other threads:[~2023-03-31 9:12 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-31 9:11 [PATCH v15 00/10] Register Type-C mode-switch in DP bridge endpoints Pin-yen Lin
2023-03-31 9:11 ` [PATCH v15 01/10] device property: Add remote endpoint to devcon matcher Pin-yen Lin
2023-04-07 21:54 ` Stephen Boyd
2023-03-31 9:11 ` [PATCH v15 02/10] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Pin-yen Lin
2023-03-31 9:11 ` Pin-yen Lin [this message]
2023-03-31 9:11 ` [PATCH v15 04/10] dt-bindings: display: bridge: anx7625: Add mode-switch support Pin-yen Lin
2023-04-06 15:18 ` Rob Herring
2023-04-12 1:38 ` Stephen Boyd
2023-04-13 9:50 ` Pin-yen Lin
2023-04-14 0:22 ` Stephen Boyd
2023-04-20 6:10 ` Stephen Boyd
2023-04-20 9:10 ` Pin-yen Lin
2023-04-27 8:33 ` Pin-yen Lin
2023-04-29 4:47 ` Stephen Boyd
2023-05-10 3:41 ` Pin-yen Lin
2023-05-11 17:30 ` Stephen Boyd
2023-05-30 5:15 ` Pin-yen Lin
2023-05-30 6:25 ` Jagan Teki
2023-03-31 9:11 ` [PATCH v15 05/10] drm/bridge: anx7625: Check for Type-C during panel registration Pin-yen Lin
2023-03-31 9:11 ` [PATCH v15 06/10] drm/bridge: Remove redundant i2c_client in anx7625/it6505 Pin-yen Lin
2023-03-31 9:11 ` [PATCH v15 07/10] drm/bridge: anx7625: Register Type C mode switches Pin-yen Lin
2023-03-31 9:11 ` [PATCH v15 08/10] dt-bindings: display: bridge: it6505: Add mode-switch support Pin-yen Lin
2023-04-06 15:15 ` Rob Herring
2023-04-06 15:50 ` Pin-yen Lin
2023-03-31 9:11 ` [PATCH v15 09/10] drm/bridge: it6505: Fix Kconfig indentation Pin-yen Lin
2023-03-31 9:11 ` [PATCH v15 10/10] drm/bridge: it6505: Register Type C mode switches Pin-yen Lin
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