[PATCH v2 0/5] Add ChromeOS EC CEC Support

[PATCH v2 0/5] Add ChromeOS EC CEC Support

[Neil Armstrong]

Hi All,

The new Google "Fizz" Intel-based ChromeOS device is gaining CEC support
through it's Embedded Controller, to enable the Linux CEC Core to communicate
with it and get the CEC Physical Address from the correct HDMI Connector, the
following must be added/changed:
- Add the CEC sub-device registration in the ChromeOS EC MFD Driver
- Add the CEC related commands and events definitions into the EC MFD driver
- Add a way to get a CEC notifier with it's (optional) connector name
- Add the CEC notifier to the i915 HDMI driver
- Add the proper ChromeOS EC CEC Driver

The CEC notifier with the connector name is the tricky point, since even on
Device-Tree platforms, there is no way to distinguish between multiple HDMI
connectors from the same DRM driver. The solution I implemented is pretty
simple and only adds an optional connector name to eventually distinguish
an HDMI connector notifier from another if they share the same device.

Feel free to comment this patchset !

Changes since v1:
 - Added cec_notifier_put to intel_hdmi
 - Fixed all small reported issues on the EC CEC driver
 - Moved the cec_notifier_get out of the #if .. #else .. #endif

Changes since RFC:
 - Moved CEC sub-device registration after CEC commands and events definitions patch
 - Removed get_notifier_get_byname
 - Added CEC_CORE select into i915 Kconfig
 - Removed CEC driver fallback if notifier is not configured on HW, added explicit warn
 - Fixed CEC core return type on error
 - Moved to cros-ec-cec media platform directory
 - Use bus_find_device() to find the pci i915 device instead of get_notifier_get_byname()
 - Fix Logical Address setup
 - Added comment about HW support
 - Removed memset of msg structures

Neil Armstrong (5):
  media: cec-notifier: Get notifier by device and connector name
  drm/i915: hdmi: add CEC notifier to intel_hdmi
  mfd: cros-ec: Introduce CEC commands and events definitions.
  mfd: cros_ec_dev: Add CEC sub-device registration
  media: platform: Add Chrome OS EC CEC driver

 drivers/gpu/drm/i915/Kconfig                     |   1 +
 drivers/gpu/drm/i915/intel_drv.h                 |   2 +
 drivers/gpu/drm/i915/intel_hdmi.c                |  12 +
 drivers/media/cec/cec-notifier.c                 |  11 +-
 drivers/media/platform/Kconfig                   |  11 +
 drivers/media/platform/Makefile                  |   2 +
 drivers/media/platform/cros-ec-cec/Makefile      |   1 +
 drivers/media/platform/cros-ec-cec/cros-ec-cec.c | 335 +++++++++++++++++++++++
 drivers/mfd/cros_ec_dev.c                        |  16 ++
 drivers/platform/chrome/cros_ec_proto.c          |  42 ++-
 include/linux/mfd/cros_ec.h                      |   2 +-
 include/linux/mfd/cros_ec_commands.h             |  80 ++++++
 include/media/cec-notifier.h                     |  27 +-
 13 files changed, 526 insertions(+), 16 deletions(-)
 create mode 100644 drivers/media/platform/cros-ec-cec/Makefile
 create mode 100644 drivers/media/platform/cros-ec-cec/cros-ec-cec.c

-- 
2.7.4

[PATCH v2 1/5] media: cec-notifier: Get notifier by device and connector name

[Neil Armstrong]

In non device-tree world, we can need to get the notifier by the driver
name directly and eventually defer probe if not yet created.

This patch adds a variant of the get function by using the device name
instead and will not create a notifier if not yet created.

But the i915 driver exposes at least 2 HDMI connectors, this patch also
adds the possibility to add a connector name tied to the notifier device
to form a tuple and associate different CEC controllers for each HDMI
connectors.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/media/cec/cec-notifier.c | 11 ++++++++---
 include/media/cec-notifier.h     | 27 ++++++++++++++++++++++++---
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
index 16dffa0..dd2078b 100644
--- a/drivers/media/cec/cec-notifier.c
+++ b/drivers/media/cec/cec-notifier.c
@@ -21,6 +21,7 @@ struct cec_notifier {
 	struct list_head head;
 	struct kref kref;
 	struct device *dev;
+	const char *conn;
 	struct cec_adapter *cec_adap;
 	void (*callback)(struct cec_adapter *adap, u16 pa);
 
@@ -30,13 +31,14 @@ struct cec_notifier {
 static LIST_HEAD(cec_notifiers);
 static DEFINE_MUTEX(cec_notifiers_lock);
 
-struct cec_notifier *cec_notifier_get(struct device *dev)
+struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn)
 {
 	struct cec_notifier *n;
 
 	mutex_lock(&cec_notifiers_lock);
 	list_for_each_entry(n, &cec_notifiers, head) {
-		if (n->dev == dev) {
+		if (n->dev == dev &&
+		    (!conn || !strcmp(n->conn, conn))) {
 			kref_get(&n->kref);
 			mutex_unlock(&cec_notifiers_lock);
 			return n;
@@ -46,6 +48,8 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
 	if (!n)
 		goto unlock;
 	n->dev = dev;
+	if (conn)
+		n->conn = kstrdup(conn, GFP_KERNEL);
 	n->phys_addr = CEC_PHYS_ADDR_INVALID;
 	mutex_init(&n->lock);
 	kref_init(&n->kref);
@@ -54,7 +58,7 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
 	mutex_unlock(&cec_notifiers_lock);
 	return n;
 }
-EXPORT_SYMBOL_GPL(cec_notifier_get);
+EXPORT_SYMBOL_GPL(cec_notifier_get_conn);
 
 static void cec_notifier_release(struct kref *kref)
 {
@@ -62,6 +66,7 @@ static void cec_notifier_release(struct kref *kref)
 		container_of(kref, struct cec_notifier, kref);
 
 	list_del(&n->head);
+	kfree(n->conn);
 	kfree(n);
 }
 
diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h
index cf0add7..814eeef 100644
--- a/include/media/cec-notifier.h
+++ b/include/media/cec-notifier.h
@@ -20,8 +20,10 @@ struct cec_notifier;
 #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
 
 /**
- * cec_notifier_get - find or create a new cec_notifier for the given device.
+ * cec_notifier_get_conn - find or create a new cec_notifier for the given
+ * device and connector tuple.
  * @dev: device that sends the events.
+ * @conn: the connector name from which the event occurs
  *
  * If a notifier for device @dev already exists, then increase the refcount
  * and return that notifier.
@@ -31,7 +33,8 @@ struct cec_notifier;
  *
  * Return NULL if the memory could not be allocated.
  */
-struct cec_notifier *cec_notifier_get(struct device *dev);
+struct cec_notifier *cec_notifier_get_conn(struct device *dev,
+					   const char *conn);
 
 /**
  * cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
@@ -85,7 +88,8 @@ void cec_register_cec_notifier(struct cec_adapter *adap,
 			       struct cec_notifier *notifier);
 
 #else
-static inline struct cec_notifier *cec_notifier_get(struct device *dev)
+static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,
+							 const char *conn)
 {
 	/* A non-NULL pointer is expected on success */
 	return (struct cec_notifier *)0xdeadfeed;
@@ -121,6 +125,23 @@ static inline void cec_register_cec_notifier(struct cec_adapter *adap,
 #endif
 
 /**
+ * cec_notifier_get - find or create a new cec_notifier for the given device.
+ * @dev: device that sends the events.
+ *
+ * If a notifier for device @dev already exists, then increase the refcount
+ * and return that notifier.
+ *
+ * If it doesn't exist, then allocate a new notifier struct and return a
+ * pointer to that new struct.
+ *
+ * Return NULL if the memory could not be allocated.
+ */
+static inline struct cec_notifier *cec_notifier_get(struct device *dev)
+{
+	return cec_notifier_get_conn(dev, NULL);
+}
+
+/**
  * cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
  *
  * @n: the CEC notifier
-- 
2.7.4

[PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Neil Armstrong]

This patchs adds the cec_notifier feature to the intel_hdmi part
of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
between each HDMI ports.
The changes will allow the i915 HDMI code to notify EDID and HPD changes
to an eventual CEC adapter.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/gpu/drm/i915/Kconfig      |  1 +
 drivers/gpu/drm/i915/intel_drv.h  |  2 ++
 drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
 3 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index dfd9588..2d65d56 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -23,6 +23,7 @@ config DRM_I915
 	select SYNC_FILE
 	select IOSF_MBI
 	select CRC32
+	select CEC_CORE if CEC_NOTIFIER
 	help
 	  Choose this option if you have a system that has "Intel Graphics
 	  Media Accelerator" or "HD Graphics" integrated graphics,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d436858..b50e51b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -39,6 +39,7 @@
 #include <drm/drm_dp_mst_helper.h>
 #include <drm/drm_rect.h>
 #include <drm/drm_atomic.h>
+#include <media/cec-notifier.h>
 
 /**
  * __wait_for - magic wait macro
@@ -1001,6 +1002,7 @@ struct intel_hdmi {
 	bool has_audio;
 	bool rgb_quant_range_selectable;
 	struct intel_connector *attached_connector;
+	struct cec_notifier *notifier;
 };
 
 struct intel_dp_mst_encoder;
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 1baef4a..e98103d 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1868,6 +1868,8 @@ intel_hdmi_set_edid(struct drm_connector *connector)
 		connected = true;
 	}
 
+	cec_notifier_set_phys_addr_from_edid(intel_hdmi->notifier, edid);
+
 	return connected;
 }
 
@@ -1876,6 +1878,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 {
 	enum drm_connector_status status;
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
+	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
 
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 		      connector->base.id, connector->name);
@@ -1891,6 +1894,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 
 	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
 
+	if (status != connector_status_connected)
+		cec_notifier_phys_addr_invalidate(intel_hdmi->notifier);
+
 	return status;
 }
 
@@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
 
 static void intel_hdmi_destroy(struct drm_connector *connector)
 {
+	if (intel_attached_hdmi(connector)->notifier)
+		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
 	kfree(to_intel_connector(connector)->detect_edid);
 	drm_connector_cleanup(connector);
 	kfree(connector);
@@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
 		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
 	}
+
+	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
+	if (!intel_hdmi->notifier)
+		DRM_DEBUG_KMS("CEC notifier get failed\n");
 }
 
 void intel_hdmi_init(struct drm_i915_private *dev_priv,
-- 
2.7.4

[PATCH v2 3/5] mfd: cros-ec: Introduce CEC commands and events definitions.

[Neil Armstrong]

The EC can expose a CEC bus, this patch adds the CEC related definitions
needed by the cros-ec-cec driver.
Having a 16 byte mkbp event size makes it possible to send CEC
messages from the EC to the AP directly inside the mkbp event
instead of first doing a notification and then a read.

Signed-off-by: Stefan Adolfsson <sadolfsson@chromium.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/platform/chrome/cros_ec_proto.c | 42 +++++++++++++----
 include/linux/mfd/cros_ec.h             |  2 +-
 include/linux/mfd/cros_ec_commands.h    | 80 +++++++++++++++++++++++++++++++++
 3 files changed, 114 insertions(+), 10 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index e7bbdf9..ba47f79 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -504,29 +504,53 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
 }
 EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
 
+static int get_next_event_xfer(struct cros_ec_device *ec_dev,
+			       struct cros_ec_command *msg,
+			       int version, uint32_t size)
+{
+	int ret;
+
+	msg->version = version;
+	msg->command = EC_CMD_GET_NEXT_EVENT;
+	msg->insize = size;
+	msg->outsize = 0;
+
+	ret = cros_ec_cmd_xfer(ec_dev, msg);
+	if (ret > 0) {
+		ec_dev->event_size = ret - 1;
+		memcpy(&ec_dev->event_data, msg->data, size);
+	}
+
+	return ret;
+}
+
 static int get_next_event(struct cros_ec_device *ec_dev)
 {
 	u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)];
 	struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
+	static int cmd_version = 1;
 	int ret;
 
+	BUILD_BUG_ON(sizeof(union ec_response_get_next_data_v1) != 16);
+
 	if (ec_dev->suspended) {
 		dev_dbg(ec_dev->dev, "Device suspended.\n");
 		return -EHOSTDOWN;
 	}
 
-	msg->version = 0;
-	msg->command = EC_CMD_GET_NEXT_EVENT;
-	msg->insize = sizeof(ec_dev->event_data);
-	msg->outsize = 0;
+	if (cmd_version == 1) {
+		ret = get_next_event_xfer(ec_dev, msg, cmd_version,
+					  sizeof(ec_dev->event_data));
+		if (ret != EC_RES_INVALID_VERSION)
+			return ret;
 
-	ret = cros_ec_cmd_xfer(ec_dev, msg);
-	if (ret > 0) {
-		ec_dev->event_size = ret - 1;
-		memcpy(&ec_dev->event_data, msg->data,
-		       sizeof(ec_dev->event_data));
+		/* Fallback to version 0 for future send attempts */
+		cmd_version = 0;
 	}
 
+	ret = get_next_event_xfer(ec_dev, msg, cmd_version,
+				  sizeof(struct ec_response_get_next_event));
+
 	return ret;
 }
 
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 2d4e23c..f3415eb 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -147,7 +147,7 @@ struct cros_ec_device {
 	bool mkbp_event_supported;
 	struct blocking_notifier_head event_notifier;
 
-	struct ec_response_get_next_event event_data;
+	struct ec_response_get_next_event_v1 event_data;
 	int event_size;
 	u32 host_event_wake_mask;
 };
diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index f2edd99..18df466 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -804,6 +804,8 @@ enum ec_feature_code {
 	EC_FEATURE_MOTION_SENSE_FIFO = 24,
 	/* EC has RTC feature that can be controlled by host commands */
 	EC_FEATURE_RTC = 27,
+	/* EC supports CEC commands */
+	EC_FEATURE_CEC = 35,
 };
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
@@ -2078,6 +2080,12 @@ enum ec_mkbp_event {
 	/* EC sent a sysrq command */
 	EC_MKBP_EVENT_SYSRQ = 6,
 
+	/* Notify the AP that something happened on CEC */
+	EC_MKBP_CEC_EVENT = 8,
+
+	/* Send an incoming CEC message to the AP */
+	EC_MKBP_EVENT_CEC_MESSAGE = 9,
+
 	/* Number of MKBP events */
 	EC_MKBP_EVENT_COUNT,
 };
@@ -2093,12 +2101,31 @@ union ec_response_get_next_data {
 	uint32_t   sysrq;
 } __packed;
 
+union ec_response_get_next_data_v1 {
+	uint8_t   key_matrix[16];
+
+	/* Unaligned */
+	uint32_t  host_event;
+
+	uint32_t   buttons;
+	uint32_t   switches;
+	uint32_t   sysrq;
+	uint32_t   cec_events;
+	uint8_t    cec_message[16];
+} __packed;
+
 struct ec_response_get_next_event {
 	uint8_t event_type;
 	/* Followed by event data if any */
 	union ec_response_get_next_data data;
 } __packed;
 
+struct ec_response_get_next_event_v1 {
+	uint8_t event_type;
+	/* Followed by event data if any */
+	union ec_response_get_next_data_v1 data;
+} __packed;
+
 /* Bit indices for buttons and switches.*/
 /* Buttons */
 #define EC_MKBP_POWER_BUTTON	0
@@ -2828,6 +2855,59 @@ struct ec_params_reboot_ec {
 /* Current version of ACPI memory address space */
 #define EC_ACPI_MEM_VERSION_CURRENT 1
 
+/*****************************************************************************/
+/*
+ * HDMI CEC commands
+ *
+ * These commands are for sending and receiving message via HDMI CEC
+ */
+#define MAX_CEC_MSG_LEN 16
+
+/* CEC message from the AP to be written on the CEC bus */
+#define EC_CMD_CEC_WRITE_MSG 0x00B8
+
+/* Message to write to the CEC bus */
+struct ec_params_cec_write {
+	uint8_t msg[MAX_CEC_MSG_LEN];
+} __packed;
+
+/* Set various CEC parameters */
+#define EC_CMD_CEC_SET 0x00BA
+
+struct ec_params_cec_set {
+	uint8_t cmd; /* enum cec_command */
+	union {
+		uint8_t enable;
+		uint8_t address;
+	};
+} __packed;
+
+/* Read various CEC parameters */
+#define EC_CMD_CEC_GET 0x00BB
+
+struct ec_params_cec_get {
+	uint8_t cmd; /* enum cec_command */
+} __packed;
+
+struct ec_response_cec_get {
+	union {
+		uint8_t enable;
+		uint8_t address;
+	};
+} __packed;
+
+enum cec_command {
+	/* CEC reading, writing and events enable */
+	CEC_CMD_ENABLE,
+	/* CEC logical address  */
+	CEC_CMD_LOGICAL_ADDRESS,
+};
+
+/* Events from CEC to AP */
+enum mkbp_cec_event {
+	EC_MKBP_CEC_SEND_OK			= 1 << 0,
+	EC_MKBP_CEC_SEND_FAILED			= 1 << 1,
+};
 
 /*****************************************************************************/
 /*
-- 
2.7.4

[PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration

[Neil Armstrong]

The EC can expose a CEC bus, thus add the cros-ec-cec MFD sub-device
when the CEC feature bit is present.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/mfd/cros_ec_dev.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index eafd06f..57064ec 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -383,6 +383,18 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
 	kfree(msg);
 }
 
+static void cros_ec_cec_register(struct cros_ec_dev *ec)
+{
+	int ret;
+	struct mfd_cell cec_cell = {
+		.name = "cros-ec-cec",
+	};
+
+	ret = mfd_add_devices(ec->dev, 0, &cec_cell, 1, NULL, 0, NULL);
+	if (ret)
+		dev_err(ec->dev, "failed to add EC CEC\n");
+}
+
 static int ec_device_probe(struct platform_device *pdev)
 {
 	int retval = -ENOMEM;
@@ -422,6 +434,10 @@ static int ec_device_probe(struct platform_device *pdev)
 	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
 		cros_ec_sensors_register(ec);
 
+	/* check whether this EC handles CEC. */
+	if (cros_ec_check_features(ec, EC_FEATURE_CEC))
+		cros_ec_cec_register(ec);
+
 	/* Take control of the lightbar from the EC. */
 	lb_manual_suspend_ctrl(ec, 1);
 
-- 
2.7.4

[PATCH v2 5/5] media: platform: Add Chrome OS EC CEC driver

[Neil Armstrong]

The Chrome OS Embedded Controller can expose a CEC bus, this patch add the
driver for such feature of the Embedded Controller.

This driver is part of the cros-ec MFD and will be add as a sub-device when
the feature bit is exposed by the EC.

The controller will only handle a single logical address and handles
all the messages retries and will only expose Success or Error.

The controller will be tied to the HDMI CEC notifier by using the platform
DMI Data and the i915 device name and connector name.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/media/platform/Kconfig                   |  11 +
 drivers/media/platform/Makefile                  |   2 +
 drivers/media/platform/cros-ec-cec/Makefile      |   1 +
 drivers/media/platform/cros-ec-cec/cros-ec-cec.c | 335 +++++++++++++++++++++++
 4 files changed, 349 insertions(+)
 create mode 100644 drivers/media/platform/cros-ec-cec/Makefile
 create mode 100644 drivers/media/platform/cros-ec-cec/cros-ec-cec.c

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index c7a1cf8..e55a8ed2 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -546,6 +546,17 @@ menuconfig CEC_PLATFORM_DRIVERS
 
 if CEC_PLATFORM_DRIVERS
 
+config VIDEO_CROS_EC_CEC
+	tristate "Chrome OS EC CEC driver"
+	depends on MFD_CROS_EC || COMPILE_TEST
+	select CEC_CORE
+	select CEC_NOTIFIER
+	---help---
+	  If you say yes here you will get support for the
+	  Chrome OS Embedded Controller's CEC.
+	  The CEC bus is present in the HDMI connector and enables communication
+	  between compatible devices.
+
 config VIDEO_MESON_AO_CEC
 	tristate "Amlogic Meson AO CEC driver"
 	depends on ARCH_MESON || COMPILE_TEST
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 932515d..830696f 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -92,3 +92,5 @@ obj-$(CONFIG_VIDEO_QCOM_CAMSS)		+= qcom/camss-8x16/
 obj-$(CONFIG_VIDEO_QCOM_VENUS)		+= qcom/venus/
 
 obj-y					+= meson/
+
+obj-y					+= cros-ec-cec/
diff --git a/drivers/media/platform/cros-ec-cec/Makefile b/drivers/media/platform/cros-ec-cec/Makefile
new file mode 100644
index 0000000..9ce97f9
--- /dev/null
+++ b/drivers/media/platform/cros-ec-cec/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_VIDEO_CROS_EC_CEC) += cros-ec-cec.o
diff --git a/drivers/media/platform/cros-ec-cec/cros-ec-cec.c b/drivers/media/platform/cros-ec-cec/cros-ec-cec.c
new file mode 100644
index 0000000..aed3368
--- /dev/null
+++ b/drivers/media/platform/cros-ec-cec/cros-ec-cec.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * CEC driver for Chrome OS Embedded Controller
+ *
+ * Copyright (c) 2018 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dmi.h>
+#include <linux/pci.h>
+#include <linux/cec.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <media/cec.h>
+#include <media/cec-notifier.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+
+#define DRV_NAME	"cros-ec-cec"
+
+/**
+ * struct cros_ec_cec - Driver data for EC CEC
+ *
+ * @cros_ec: Pointer to EC device
+ * @notifier: Notifier info for responding to EC events
+ * @adap: CEC adapter
+ * @notify: CEC notifier pointer
+ * @rx_msg: storage for a received message
+ */
+struct cros_ec_cec {
+	struct cros_ec_device *cros_ec;
+	struct notifier_block notifier;
+	struct cec_adapter *adap;
+	struct cec_notifier *notify;
+	struct cec_msg rx_msg;
+};
+
+static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
+{
+	struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
+	uint8_t *cec_message = cros_ec->event_data.data.cec_message;
+	unsigned int len = cros_ec->event_size;
+
+	cros_ec_cec->rx_msg.len = len;
+	memcpy(cros_ec_cec->rx_msg.msg, cec_message, len);
+
+	cec_received_msg(cros_ec_cec->adap, &cros_ec_cec->rx_msg);
+}
+
+static void handle_cec_event(struct cros_ec_cec *cros_ec_cec)
+{
+	struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
+	uint32_t events = cros_ec->event_data.data.cec_events;
+
+	if (events & EC_MKBP_CEC_SEND_OK)
+		cec_transmit_attempt_done(cros_ec_cec->adap,
+					  CEC_TX_STATUS_OK);
+
+	/* FW takes care of all retries, tell core to avoid more retries */
+	if (events & EC_MKBP_CEC_SEND_FAILED)
+		cec_transmit_attempt_done(cros_ec_cec->adap,
+					  CEC_TX_STATUS_MAX_RETRIES |
+					  CEC_TX_STATUS_NACK);
+}
+
+static int cros_ec_cec_event(struct notifier_block *nb,
+			     unsigned long queued_during_suspend,
+			     void *_notify)
+{
+	struct cros_ec_cec *cros_ec_cec;
+	struct cros_ec_device *cros_ec;
+
+	cros_ec_cec = container_of(nb, struct cros_ec_cec, notifier);
+	cros_ec = cros_ec_cec->cros_ec;
+
+	if (cros_ec->event_data.event_type == EC_MKBP_CEC_EVENT) {
+		handle_cec_event(cros_ec_cec);
+		return NOTIFY_OK;
+	}
+
+	if (cros_ec->event_data.event_type == EC_MKBP_EVENT_CEC_MESSAGE) {
+		handle_cec_message(cros_ec_cec);
+		return NOTIFY_OK;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int cros_ec_cec_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
+{
+	struct cros_ec_cec *cros_ec_cec = adap->priv;
+	struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_params_cec_set data;
+	} __packed msg = {};
+	int ret;
+
+	msg.msg.command = EC_CMD_CEC_SET;
+	msg.msg.outsize = sizeof(msg.data);
+	msg.data.cmd = CEC_CMD_LOGICAL_ADDRESS;
+	msg.data.address = logical_addr;
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev,
+			"error setting CEC logical address on EC: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_ec_cec_transmit(struct cec_adapter *adap, u8 attempts,
+				u32 signal_free_time, struct cec_msg *cec_msg)
+{
+	struct cros_ec_cec *cros_ec_cec = adap->priv;
+	struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_params_cec_write data;
+	} __packed msg = {};
+	int ret;
+
+	msg.msg.command = EC_CMD_CEC_WRITE_MSG;
+	msg.msg.outsize = cec_msg->len;
+	memcpy(msg.data.msg, cec_msg->msg, cec_msg->len);
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev,
+			"error writing CEC msg on EC: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_ec_cec_adap_enable(struct cec_adapter *adap, bool enable)
+{
+	struct cros_ec_cec *cros_ec_cec = adap->priv;
+	struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_params_cec_set data;
+	} __packed msg = {};
+	int ret;
+
+	msg.msg.command = EC_CMD_CEC_SET;
+	msg.msg.outsize = sizeof(msg.data);
+	msg.data.cmd = CEC_CMD_ENABLE;
+	msg.data.enable = enable;
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev,
+			"error %sabling CEC on EC: %d\n",
+			(enable ? "en" : "dis"), ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct cec_adap_ops cros_ec_cec_ops = {
+	.adap_enable = cros_ec_cec_adap_enable,
+	.adap_log_addr = cros_ec_cec_set_log_addr,
+	.adap_transmit = cros_ec_cec_transmit,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int cros_ec_cec_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cros_ec_cec *cros_ec_cec = dev_get_drvdata(&pdev->dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(cros_ec_cec->cros_ec->irq);
+
+	return 0;
+}
+
+static int cros_ec_cec_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cros_ec_cec *cros_ec_cec = dev_get_drvdata(&pdev->dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(cros_ec_cec->cros_ec->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(cros_ec_cec_pm_ops,
+	cros_ec_cec_suspend, cros_ec_cec_resume);
+
+/*
+ * The Firmware only handles single CEC interface tied to a single HDMI
+ * connector we specify along the DRM device name handling the HDMI output
+ */
+
+struct cec_dmi_match {
+	char *sys_vendor;
+	char *product_name;
+	char *devname;
+	char *conn;
+};
+
+static const struct cec_dmi_match cec_dmi_match_table[] = {
+	/* Google Fizz */
+	{ "Google", "Fizz", "0000:00:02.0", "HDMI-A-1" },
+};
+
+static int cros_ec_cec_get_notifier(struct device *dev,
+				    struct cec_notifier **notify)
+{
+	int i;
+
+	for (i = 0 ; i < ARRAY_SIZE(cec_dmi_match_table) ; ++i) {
+		const struct cec_dmi_match *m = &cec_dmi_match_table[i];
+
+		if (dmi_match(DMI_SYS_VENDOR, m->sys_vendor) &&
+		    dmi_match(DMI_PRODUCT_NAME, m->product_name)) {
+			struct device *d;
+
+			/* Find the device, bail out if not yet registered */
+			d = bus_find_device_by_name(&pci_bus_type, NULL,
+						    m->devname);
+			if (!d)
+				return -EPROBE_DEFER;
+
+			*notify = cec_notifier_get_conn(d, m->conn);
+			return 0;
+		}
+	}
+
+	/* Hardware support must be added in the cec_dmi_match_table */
+	dev_warn(dev, "CEC notifier not configured for this hardware\n");
+
+	return -ENODEV;
+}
+
+static int cros_ec_cec_probe(struct platform_device *pdev)
+{
+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
+	struct cros_ec_device *cros_ec = ec_dev->ec_dev;
+	struct cros_ec_cec *cros_ec_cec;
+	int ret;
+
+	cros_ec_cec = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_cec),
+				   GFP_KERNEL);
+	if (!cros_ec_cec)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, cros_ec_cec);
+	cros_ec_cec->cros_ec = cros_ec;
+
+	ret = cros_ec_cec_get_notifier(&pdev->dev, &cros_ec_cec->notify);
+	if (ret)
+		return ret;
+
+	ret = device_init_wakeup(&pdev->dev, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize wakeup\n");
+		return ret;
+	}
+
+	cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
+						 DRV_NAME, CEC_CAP_DEFAULTS, 1);
+	if (IS_ERR(cros_ec_cec->adap))
+		return PTR_ERR(cros_ec_cec->adap);
+
+	/* Get CEC events from the EC. */
+	cros_ec_cec->notifier.notifier_call = cros_ec_cec_event;
+	ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
+					       &cros_ec_cec->notifier);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register notifier\n");
+		cec_delete_adapter(cros_ec_cec->adap);
+		return ret;
+	}
+
+	ret = cec_register_adapter(cros_ec_cec->adap, &pdev->dev);
+	if (ret < 0) {
+		cec_delete_adapter(cros_ec_cec->adap);
+		return ret;
+	}
+
+	cec_register_cec_notifier(cros_ec_cec->adap, cros_ec_cec->notify);
+
+	return 0;
+}
+
+static int cros_ec_cec_remove(struct platform_device *pdev)
+{
+	struct cros_ec_cec *cros_ec_cec = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	ret = blocking_notifier_chain_unregister(
+			&cros_ec_cec->cros_ec->event_notifier,
+			&cros_ec_cec->notifier);
+
+	if (ret) {
+		dev_err(dev, "failed to unregister notifier\n");
+		return ret;
+	}
+
+	cec_unregister_adapter(cros_ec_cec->adap);
+
+	if (cros_ec_cec->notify)
+		cec_notifier_put(cros_ec_cec->notify);
+
+	return 0;
+}
+
+static struct platform_driver cros_ec_cec_driver = {
+	.probe = cros_ec_cec_probe,
+	.remove  = cros_ec_cec_remove,
+	.driver = {
+		.name = DRV_NAME,
+		.pm = &cros_ec_cec_pm_ops,
+	},
+};
+
+module_platform_driver(cros_ec_cec_driver);
+
+MODULE_DESCRIPTION("CEC driver for Chrome OS ECs");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
-- 
2.7.4

Re: [PATCH v2 1/5] media: cec-notifier: Get notifier by device and connector name

[Hans Verkuil]

On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> In non device-tree world, we can need to get the notifier by the driver
> name directly and eventually defer probe if not yet created.
> 
> This patch adds a variant of the get function by using the device name
> instead and will not create a notifier if not yet created.
> 
> But the i915 driver exposes at least 2 HDMI connectors, this patch also
> adds the possibility to add a connector name tied to the notifier device
> to form a tuple and associate different CEC controllers for each HDMI
> connectors.

The patch looks good, but I'm curious about this paragraph above.

Was this tested with devices with more than one HDMI output? Or only on
laptops with a single physical HDMI output? If there are two or more
outputs then I guess it is the HW designer that decides with output gets
CEC support?

Regards,

	Hans

> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/media/cec/cec-notifier.c | 11 ++++++++---
>  include/media/cec-notifier.h     | 27 ++++++++++++++++++++++++---
>  2 files changed, 32 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
> index 16dffa0..dd2078b 100644
> --- a/drivers/media/cec/cec-notifier.c
> +++ b/drivers/media/cec/cec-notifier.c
> @@ -21,6 +21,7 @@ struct cec_notifier {
>  	struct list_head head;
>  	struct kref kref;
>  	struct device *dev;
> +	const char *conn;
>  	struct cec_adapter *cec_adap;
>  	void (*callback)(struct cec_adapter *adap, u16 pa);
>  
> @@ -30,13 +31,14 @@ struct cec_notifier {
>  static LIST_HEAD(cec_notifiers);
>  static DEFINE_MUTEX(cec_notifiers_lock);
>  
> -struct cec_notifier *cec_notifier_get(struct device *dev)
> +struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn)
>  {
>  	struct cec_notifier *n;
>  
>  	mutex_lock(&cec_notifiers_lock);
>  	list_for_each_entry(n, &cec_notifiers, head) {
> -		if (n->dev == dev) {
> +		if (n->dev == dev &&
> +		    (!conn || !strcmp(n->conn, conn))) {
>  			kref_get(&n->kref);
>  			mutex_unlock(&cec_notifiers_lock);
>  			return n;
> @@ -46,6 +48,8 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
>  	if (!n)
>  		goto unlock;
>  	n->dev = dev;
> +	if (conn)
> +		n->conn = kstrdup(conn, GFP_KERNEL);
>  	n->phys_addr = CEC_PHYS_ADDR_INVALID;
>  	mutex_init(&n->lock);
>  	kref_init(&n->kref);
> @@ -54,7 +58,7 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
>  	mutex_unlock(&cec_notifiers_lock);
>  	return n;
>  }
> -EXPORT_SYMBOL_GPL(cec_notifier_get);
> +EXPORT_SYMBOL_GPL(cec_notifier_get_conn);
>  
>  static void cec_notifier_release(struct kref *kref)
>  {
> @@ -62,6 +66,7 @@ static void cec_notifier_release(struct kref *kref)
>  		container_of(kref, struct cec_notifier, kref);
>  
>  	list_del(&n->head);
> +	kfree(n->conn);
>  	kfree(n);
>  }
>  
> diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h
> index cf0add7..814eeef 100644
> --- a/include/media/cec-notifier.h
> +++ b/include/media/cec-notifier.h
> @@ -20,8 +20,10 @@ struct cec_notifier;
>  #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
>  
>  /**
> - * cec_notifier_get - find or create a new cec_notifier for the given device.
> + * cec_notifier_get_conn - find or create a new cec_notifier for the given
> + * device and connector tuple.
>   * @dev: device that sends the events.
> + * @conn: the connector name from which the event occurs
>   *
>   * If a notifier for device @dev already exists, then increase the refcount
>   * and return that notifier.
> @@ -31,7 +33,8 @@ struct cec_notifier;
>   *
>   * Return NULL if the memory could not be allocated.
>   */
> -struct cec_notifier *cec_notifier_get(struct device *dev);
> +struct cec_notifier *cec_notifier_get_conn(struct device *dev,
> +					   const char *conn);
>  
>  /**
>   * cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
> @@ -85,7 +88,8 @@ void cec_register_cec_notifier(struct cec_adapter *adap,
>  			       struct cec_notifier *notifier);
>  
>  #else
> -static inline struct cec_notifier *cec_notifier_get(struct device *dev)
> +static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,
> +							 const char *conn)
>  {
>  	/* A non-NULL pointer is expected on success */
>  	return (struct cec_notifier *)0xdeadfeed;
> @@ -121,6 +125,23 @@ static inline void cec_register_cec_notifier(struct cec_adapter *adap,
>  #endif
>  
>  /**
> + * cec_notifier_get - find or create a new cec_notifier for the given device.
> + * @dev: device that sends the events.
> + *
> + * If a notifier for device @dev already exists, then increase the refcount
> + * and return that notifier.
> + *
> + * If it doesn't exist, then allocate a new notifier struct and return a
> + * pointer to that new struct.
> + *
> + * Return NULL if the memory could not be allocated.
> + */
> +static inline struct cec_notifier *cec_notifier_get(struct device *dev)
> +{
> +	return cec_notifier_get_conn(dev, NULL);
> +}
> +
> +/**
>   * cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
>   *
>   * @n: the CEC notifier
> 

Re: [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Hans Verkuil]

On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> This patchs adds the cec_notifier feature to the intel_hdmi part
> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
> between each HDMI ports.
> The changes will allow the i915 HDMI code to notify EDID and HPD changes
> to an eventual CEC adapter.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>

Thanks!

	Hans

> ---
>  drivers/gpu/drm/i915/Kconfig      |  1 +
>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
>  3 files changed, 15 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index dfd9588..2d65d56 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -23,6 +23,7 @@ config DRM_I915
>  	select SYNC_FILE
>  	select IOSF_MBI
>  	select CRC32
> +	select CEC_CORE if CEC_NOTIFIER
>  	help
>  	  Choose this option if you have a system that has "Intel Graphics
>  	  Media Accelerator" or "HD Graphics" integrated graphics,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index d436858..b50e51b 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -39,6 +39,7 @@
>  #include <drm/drm_dp_mst_helper.h>
>  #include <drm/drm_rect.h>
>  #include <drm/drm_atomic.h>
> +#include <media/cec-notifier.h>
>  
>  /**
>   * __wait_for - magic wait macro
> @@ -1001,6 +1002,7 @@ struct intel_hdmi {
>  	bool has_audio;
>  	bool rgb_quant_range_selectable;
>  	struct intel_connector *attached_connector;
> +	struct cec_notifier *notifier;
>  };
>  
>  struct intel_dp_mst_encoder;
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 1baef4a..e98103d 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1868,6 +1868,8 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>  		connected = true;
>  	}
>  
> +	cec_notifier_set_phys_addr_from_edid(intel_hdmi->notifier, edid);
> +
>  	return connected;
>  }
>  
> @@ -1876,6 +1878,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  {
>  	enum drm_connector_status status;
>  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
> +	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
>  
>  	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
>  		      connector->base.id, connector->name);
> @@ -1891,6 +1894,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  
>  	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
>  
> +	if (status != connector_status_connected)
> +		cec_notifier_phys_addr_invalidate(intel_hdmi->notifier);
> +
>  	return status;
>  }
>  
> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>  
>  static void intel_hdmi_destroy(struct drm_connector *connector)
>  {
> +	if (intel_attached_hdmi(connector)->notifier)
> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>  	kfree(to_intel_connector(connector)->detect_edid);
>  	drm_connector_cleanup(connector);
>  	kfree(connector);
> @@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>  	}
> +
> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
> +	if (!intel_hdmi->notifier)
> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
>  }
>  
>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
> 

Re: [PATCH v2 3/5] mfd: cros-ec: Introduce CEC commands and events definitions.

[Hans Verkuil]

On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> The EC can expose a CEC bus, this patch adds the CEC related definitions
> needed by the cros-ec-cec driver.
> Having a 16 byte mkbp event size makes it possible to send CEC
> messages from the EC to the AP directly inside the mkbp event
> instead of first doing a notification and then a read.
> 
> Signed-off-by: Stefan Adolfsson <sadolfsson@chromium.org>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/platform/chrome/cros_ec_proto.c | 42 +++++++++++++----
>  include/linux/mfd/cros_ec.h             |  2 +-
>  include/linux/mfd/cros_ec_commands.h    | 80 +++++++++++++++++++++++++++++++++
>  3 files changed, 114 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index e7bbdf9..ba47f79 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -504,29 +504,53 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
>  }
>  EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
>  
> +static int get_next_event_xfer(struct cros_ec_device *ec_dev,
> +			       struct cros_ec_command *msg,
> +			       int version, uint32_t size)
> +{
> +	int ret;
> +
> +	msg->version = version;
> +	msg->command = EC_CMD_GET_NEXT_EVENT;
> +	msg->insize = size;
> +	msg->outsize = 0;
> +
> +	ret = cros_ec_cmd_xfer(ec_dev, msg);
> +	if (ret > 0) {
> +		ec_dev->event_size = ret - 1;
> +		memcpy(&ec_dev->event_data, msg->data, size);
> +	}
> +
> +	return ret;
> +}
> +
>  static int get_next_event(struct cros_ec_device *ec_dev)
>  {
>  	u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)];
>  	struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
> +	static int cmd_version = 1;
>  	int ret;
>  
> +	BUILD_BUG_ON(sizeof(union ec_response_get_next_data_v1) != 16);

Use the define instead of hardcoding 16. I'm not really sure why you need this.
If cec_message uses the right define for the array size (see my comment below),
then this really can't go wrong, can it?

> +
>  	if (ec_dev->suspended) {
>  		dev_dbg(ec_dev->dev, "Device suspended.\n");
>  		return -EHOSTDOWN;
>  	}
>  
> -	msg->version = 0;
> -	msg->command = EC_CMD_GET_NEXT_EVENT;
> -	msg->insize = sizeof(ec_dev->event_data);
> -	msg->outsize = 0;
> +	if (cmd_version == 1) {
> +		ret = get_next_event_xfer(ec_dev, msg, cmd_version,
> +					  sizeof(ec_dev->event_data));
> +		if (ret != EC_RES_INVALID_VERSION)
> +			return ret;
>  
> -	ret = cros_ec_cmd_xfer(ec_dev, msg);
> -	if (ret > 0) {
> -		ec_dev->event_size = ret - 1;
> -		memcpy(&ec_dev->event_data, msg->data,
> -		       sizeof(ec_dev->event_data));
> +		/* Fallback to version 0 for future send attempts */
> +		cmd_version = 0;
>  	}
>  
> +	ret = get_next_event_xfer(ec_dev, msg, cmd_version,
> +				  sizeof(struct ec_response_get_next_event));
> +
>  	return ret;
>  }
>  
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 2d4e23c..f3415eb 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -147,7 +147,7 @@ struct cros_ec_device {
>  	bool mkbp_event_supported;
>  	struct blocking_notifier_head event_notifier;
>  
> -	struct ec_response_get_next_event event_data;
> +	struct ec_response_get_next_event_v1 event_data;
>  	int event_size;
>  	u32 host_event_wake_mask;
>  };
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index f2edd99..18df466 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -804,6 +804,8 @@ enum ec_feature_code {
>  	EC_FEATURE_MOTION_SENSE_FIFO = 24,
>  	/* EC has RTC feature that can be controlled by host commands */
>  	EC_FEATURE_RTC = 27,
> +	/* EC supports CEC commands */
> +	EC_FEATURE_CEC = 35,
>  };
>  
>  #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
> @@ -2078,6 +2080,12 @@ enum ec_mkbp_event {
>  	/* EC sent a sysrq command */
>  	EC_MKBP_EVENT_SYSRQ = 6,
>  
> +	/* Notify the AP that something happened on CEC */
> +	EC_MKBP_CEC_EVENT = 8,
> +
> +	/* Send an incoming CEC message to the AP */
> +	EC_MKBP_EVENT_CEC_MESSAGE = 9,
> +
>  	/* Number of MKBP events */
>  	EC_MKBP_EVENT_COUNT,
>  };
> @@ -2093,12 +2101,31 @@ union ec_response_get_next_data {
>  	uint32_t   sysrq;
>  } __packed;
>  
> +union ec_response_get_next_data_v1 {
> +	uint8_t   key_matrix[16];
> +
> +	/* Unaligned */
> +	uint32_t  host_event;
> +
> +	uint32_t   buttons;
> +	uint32_t   switches;
> +	uint32_t   sysrq;
> +	uint32_t   cec_events;
> +	uint8_t    cec_message[16];
> +} __packed;
> +
>  struct ec_response_get_next_event {
>  	uint8_t event_type;
>  	/* Followed by event data if any */
>  	union ec_response_get_next_data data;
>  } __packed;
>  
> +struct ec_response_get_next_event_v1 {
> +	uint8_t event_type;
> +	/* Followed by event data if any */
> +	union ec_response_get_next_data_v1 data;
> +} __packed;
> +
>  /* Bit indices for buttons and switches.*/
>  /* Buttons */
>  #define EC_MKBP_POWER_BUTTON	0
> @@ -2828,6 +2855,59 @@ struct ec_params_reboot_ec {
>  /* Current version of ACPI memory address space */
>  #define EC_ACPI_MEM_VERSION_CURRENT 1
>  
> +/*****************************************************************************/
> +/*
> + * HDMI CEC commands
> + *
> + * These commands are for sending and receiving message via HDMI CEC
> + */
> +#define MAX_CEC_MSG_LEN 16

Hmm, uapi/linux/cec.h already defines CEC_MAX_MSG_SIZE with the same value.
Perhaps it is better to include linux/cec.h here instead of creating a second
define?

And shouldn't this define also be used for the cec_message array above?

Regards,

	Hans

> +
> +/* CEC message from the AP to be written on the CEC bus */
> +#define EC_CMD_CEC_WRITE_MSG 0x00B8
> +
> +/* Message to write to the CEC bus */
> +struct ec_params_cec_write {
> +	uint8_t msg[MAX_CEC_MSG_LEN];
> +} __packed;
> +
> +/* Set various CEC parameters */
> +#define EC_CMD_CEC_SET 0x00BA
> +
> +struct ec_params_cec_set {
> +	uint8_t cmd; /* enum cec_command */
> +	union {
> +		uint8_t enable;
> +		uint8_t address;
> +	};
> +} __packed;
> +
> +/* Read various CEC parameters */
> +#define EC_CMD_CEC_GET 0x00BB
> +
> +struct ec_params_cec_get {
> +	uint8_t cmd; /* enum cec_command */
> +} __packed;
> +
> +struct ec_response_cec_get {
> +	union {
> +		uint8_t enable;
> +		uint8_t address;
> +	};
> +} __packed;
> +
> +enum cec_command {
> +	/* CEC reading, writing and events enable */
> +	CEC_CMD_ENABLE,
> +	/* CEC logical address  */
> +	CEC_CMD_LOGICAL_ADDRESS,
> +};
> +
> +/* Events from CEC to AP */
> +enum mkbp_cec_event {
> +	EC_MKBP_CEC_SEND_OK			= 1 << 0,
> +	EC_MKBP_CEC_SEND_FAILED			= 1 << 1,
> +};
>  
>  /*****************************************************************************/
>  /*
> 

Re: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration

[Hans Verkuil]

On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> The EC can expose a CEC bus, thus add the cros-ec-cec MFD sub-device
> when the CEC feature bit is present.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

For what it is worth (not an MFD expert):

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Thanks!

	Hans

> ---
>  drivers/mfd/cros_ec_dev.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index eafd06f..57064ec 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -383,6 +383,18 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>  	kfree(msg);
>  }
>  
> +static void cros_ec_cec_register(struct cros_ec_dev *ec)
> +{
> +	int ret;
> +	struct mfd_cell cec_cell = {
> +		.name = "cros-ec-cec",
> +	};
> +
> +	ret = mfd_add_devices(ec->dev, 0, &cec_cell, 1, NULL, 0, NULL);
> +	if (ret)
> +		dev_err(ec->dev, "failed to add EC CEC\n");
> +}
> +
>  static int ec_device_probe(struct platform_device *pdev)
>  {
>  	int retval = -ENOMEM;
> @@ -422,6 +434,10 @@ static int ec_device_probe(struct platform_device *pdev)
>  	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
>  		cros_ec_sensors_register(ec);
>  
> +	/* check whether this EC handles CEC. */
> +	if (cros_ec_check_features(ec, EC_FEATURE_CEC))
> +		cros_ec_cec_register(ec);
> +
>  	/* Take control of the lightbar from the EC. */
>  	lb_manual_suspend_ctrl(ec, 1);
>  
> 

Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Ville Syrjälä]

On Tue, May 15, 2018 at 04:42:19PM +0200, Neil Armstrong wrote:
> This patchs adds the cec_notifier feature to the intel_hdmi part
> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
> between each HDMI ports.
> The changes will allow the i915 HDMI code to notify EDID and HPD changes
> to an eventual CEC adapter.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  drivers/gpu/drm/i915/Kconfig      |  1 +
>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
>  3 files changed, 15 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index dfd9588..2d65d56 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -23,6 +23,7 @@ config DRM_I915
>  	select SYNC_FILE
>  	select IOSF_MBI
>  	select CRC32
> +	select CEC_CORE if CEC_NOTIFIER
>  	help
>  	  Choose this option if you have a system that has "Intel Graphics
>  	  Media Accelerator" or "HD Graphics" integrated graphics,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index d436858..b50e51b 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -39,6 +39,7 @@
>  #include <drm/drm_dp_mst_helper.h>
>  #include <drm/drm_rect.h>
>  #include <drm/drm_atomic.h>
> +#include <media/cec-notifier.h>
>  
>  /**
>   * __wait_for - magic wait macro
> @@ -1001,6 +1002,7 @@ struct intel_hdmi {
>  	bool has_audio;
>  	bool rgb_quant_range_selectable;
>  	struct intel_connector *attached_connector;
> +	struct cec_notifier *notifier;
>  };
>  
>  struct intel_dp_mst_encoder;
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 1baef4a..e98103d 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1868,6 +1868,8 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>  		connected = true;
>  	}
>  
> +	cec_notifier_set_phys_addr_from_edid(intel_hdmi->notifier, edid);
> +
>  	return connected;
>  }
>  
> @@ -1876,6 +1878,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  {
>  	enum drm_connector_status status;
>  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
> +	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
>  
>  	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
>  		      connector->base.id, connector->name);
> @@ -1891,6 +1894,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  
>  	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
>  
> +	if (status != connector_status_connected)
> +		cec_notifier_phys_addr_invalidate(intel_hdmi->notifier);
> +
>  	return status;
>  }
>  
> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>  
>  static void intel_hdmi_destroy(struct drm_connector *connector)
>  {
> +	if (intel_attached_hdmi(connector)->notifier)
> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>  	kfree(to_intel_connector(connector)->detect_edid);
>  	drm_connector_cleanup(connector);
>  	kfree(connector);
> @@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>  	}
> +
> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);

What are we doing with the connector name here? Those are not actually
guaranteed to be stable, and any change in the connector probe order
may cause the name to change.

> +	if (!intel_hdmi->notifier)
> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
>  }
>  
>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
> -- 
> 2.7.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel

Re: [PATCH v2 5/5] media: platform: Add Chrome OS EC CEC driver

[Hans Verkuil]

On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> The Chrome OS Embedded Controller can expose a CEC bus, this patch add the
> driver for such feature of the Embedded Controller.
> 
> This driver is part of the cros-ec MFD and will be add as a sub-device when
> the feature bit is exposed by the EC.
> 
> The controller will only handle a single logical address and handles
> all the messages retries and will only expose Success or Error.
> 
> The controller will be tied to the HDMI CEC notifier by using the platform
> DMI Data and the i915 device name and connector name.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---

<snip>

> +static SIMPLE_DEV_PM_OPS(cros_ec_cec_pm_ops,
> +	cros_ec_cec_suspend, cros_ec_cec_resume);
> +
> +/*
> + * The Firmware only handles single CEC interface tied to a single HDMI

single CEC -> a single CEC

> + * connector we specify along the DRM device name handling the HDMI output

along -> along with

> + */
> +
> +struct cec_dmi_match {
> +	char *sys_vendor;
> +	char *product_name;
> +	char *devname;
> +	char *conn;
> +};
> +

Looks good!

Regards,

	Hans

Re: [PATCH v2 1/5] media: cec-notifier: Get notifier by device and connector name

[Neil Armstrong]

On 15/05/2018 17:22, Hans Verkuil wrote:
> On 05/15/2018 04:42 PM, Neil Armstrong wrote:
>> In non device-tree world, we can need to get the notifier by the driver
>> name directly and eventually defer probe if not yet created.
>>
>> This patch adds a variant of the get function by using the device name
>> instead and will not create a notifier if not yet created.
>>
>> But the i915 driver exposes at least 2 HDMI connectors, this patch also
>> adds the possibility to add a connector name tied to the notifier device
>> to form a tuple and associate different CEC controllers for each HDMI
>> connectors.
> 
> The patch looks good, but I'm curious about this paragraph above.
> 
> Was this tested with devices with more than one HDMI output? Or only on
> laptops with a single physical HDMI output? If there are two or more
> outputs then I guess it is the HW designer that decides with output gets
> CEC support?

The driver exposes 2 HDMI connectors (I suspect one is connected to the USB-C alt mode mux along the DP port),
and only one connected has the CEC line connected to the Embedded Controller.

Neil

> 
> Regards,
> 
> 	Hans
> 
>>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>>  drivers/media/cec/cec-notifier.c | 11 ++++++++---
>>  include/media/cec-notifier.h     | 27 ++++++++++++++++++++++++---
>>  2 files changed, 32 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
>> index 16dffa0..dd2078b 100644
>> --- a/drivers/media/cec/cec-notifier.c
>> +++ b/drivers/media/cec/cec-notifier.c
>> @@ -21,6 +21,7 @@ struct cec_notifier {
>>  	struct list_head head;
>>  	struct kref kref;
>>  	struct device *dev;
>> +	const char *conn;
>>  	struct cec_adapter *cec_adap;
>>  	void (*callback)(struct cec_adapter *adap, u16 pa);
>>  
>> @@ -30,13 +31,14 @@ struct cec_notifier {
>>  static LIST_HEAD(cec_notifiers);
>>  static DEFINE_MUTEX(cec_notifiers_lock);
>>  
>> -struct cec_notifier *cec_notifier_get(struct device *dev)
>> +struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn)
>>  {
>>  	struct cec_notifier *n;
>>  
>>  	mutex_lock(&cec_notifiers_lock);
>>  	list_for_each_entry(n, &cec_notifiers, head) {
>> -		if (n->dev == dev) {
>> +		if (n->dev == dev &&
>> +		    (!conn || !strcmp(n->conn, conn))) {
>>  			kref_get(&n->kref);
>>  			mutex_unlock(&cec_notifiers_lock);
>>  			return n;
>> @@ -46,6 +48,8 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
>>  	if (!n)
>>  		goto unlock;
>>  	n->dev = dev;
>> +	if (conn)
>> +		n->conn = kstrdup(conn, GFP_KERNEL);
>>  	n->phys_addr = CEC_PHYS_ADDR_INVALID;
>>  	mutex_init(&n->lock);
>>  	kref_init(&n->kref);
>> @@ -54,7 +58,7 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
>>  	mutex_unlock(&cec_notifiers_lock);
>>  	return n;
>>  }
>> -EXPORT_SYMBOL_GPL(cec_notifier_get);
>> +EXPORT_SYMBOL_GPL(cec_notifier_get_conn);
>>  
>>  static void cec_notifier_release(struct kref *kref)
>>  {
>> @@ -62,6 +66,7 @@ static void cec_notifier_release(struct kref *kref)
>>  		container_of(kref, struct cec_notifier, kref);
>>  
>>  	list_del(&n->head);
>> +	kfree(n->conn);
>>  	kfree(n);
>>  }
>>  
>> diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h
>> index cf0add7..814eeef 100644
>> --- a/include/media/cec-notifier.h
>> +++ b/include/media/cec-notifier.h
>> @@ -20,8 +20,10 @@ struct cec_notifier;
>>  #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
>>  
>>  /**
>> - * cec_notifier_get - find or create a new cec_notifier for the given device.
>> + * cec_notifier_get_conn - find or create a new cec_notifier for the given
>> + * device and connector tuple.
>>   * @dev: device that sends the events.
>> + * @conn: the connector name from which the event occurs
>>   *
>>   * If a notifier for device @dev already exists, then increase the refcount
>>   * and return that notifier.
>> @@ -31,7 +33,8 @@ struct cec_notifier;
>>   *
>>   * Return NULL if the memory could not be allocated.
>>   */
>> -struct cec_notifier *cec_notifier_get(struct device *dev);
>> +struct cec_notifier *cec_notifier_get_conn(struct device *dev,
>> +					   const char *conn);
>>  
>>  /**
>>   * cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
>> @@ -85,7 +88,8 @@ void cec_register_cec_notifier(struct cec_adapter *adap,
>>  			       struct cec_notifier *notifier);
>>  
>>  #else
>> -static inline struct cec_notifier *cec_notifier_get(struct device *dev)
>> +static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,
>> +							 const char *conn)
>>  {
>>  	/* A non-NULL pointer is expected on success */
>>  	return (struct cec_notifier *)0xdeadfeed;
>> @@ -121,6 +125,23 @@ static inline void cec_register_cec_notifier(struct cec_adapter *adap,
>>  #endif
>>  
>>  /**
>> + * cec_notifier_get - find or create a new cec_notifier for the given device.
>> + * @dev: device that sends the events.
>> + *
>> + * If a notifier for device @dev already exists, then increase the refcount
>> + * and return that notifier.
>> + *
>> + * If it doesn't exist, then allocate a new notifier struct and return a
>> + * pointer to that new struct.
>> + *
>> + * Return NULL if the memory could not be allocated.
>> + */
>> +static inline struct cec_notifier *cec_notifier_get(struct device *dev)
>> +{
>> +	return cec_notifier_get_conn(dev, NULL);
>> +}
>> +
>> +/**
>>   * cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
>>   *
>>   * @n: the CEC notifier
>>
> 

Re: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration

[Enric Balletbo Serra]

Hi Neil,

I suspect that this patch will conflict with some patches that will be
queued for 4.18 that also introduces new devices, well, for now I
don't see these merged in the Lee's tree.

Based on some reviews I got when I send a patch to this file ...

2018-05-15 17:29 GMT+02:00 Hans Verkuil <hverkuil@xs4all.nl>:
> On 05/15/2018 04:42 PM, Neil Armstrong wrote:
>> The EC can expose a CEC bus, thus add the cros-ec-cec MFD sub-device
>> when the CEC feature bit is present.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>
> For what it is worth (not an MFD expert):
>
> Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
>
> Thanks!
>
>         Hans
>
>> ---
>>  drivers/mfd/cros_ec_dev.c | 16 ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
>> index eafd06f..57064ec 100644
>> --- a/drivers/mfd/cros_ec_dev.c
>> +++ b/drivers/mfd/cros_ec_dev.c
>> @@ -383,6 +383,18 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>>       kfree(msg);
>>  }
>>
>> +static void cros_ec_cec_register(struct cros_ec_dev *ec)
>> +{
>> +     int ret;
>> +     struct mfd_cell cec_cell = {
>> +             .name = "cros-ec-cec",
>> +     };
>> +
>> +     ret = mfd_add_devices(ec->dev, 0, &cec_cell, 1, NULL, 0, NULL);
>> +     if (ret)
>> +             dev_err(ec->dev, "failed to add EC CEC\n");
>> +}
>> +

Do not create a single function to only call mfd_add_devices, instead
do the following on top:

static const struct mfd_cell cros_ec_cec_cells[] = {
        { .name = "cros-ec-cec" }
};


>>  static int ec_device_probe(struct platform_device *pdev)
>>  {
>>       int retval = -ENOMEM;
>> @@ -422,6 +434,10 @@ static int ec_device_probe(struct platform_device *pdev)
>>       if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
>>               cros_ec_sensors_register(ec);
>>
>> +     /* check whether this EC handles CEC. */
>> +     if (cros_ec_check_features(ec, EC_FEATURE_CEC))
>> +             cros_ec_cec_register(ec);
>> +

and use PLATFORM_DEVID_AUTO and the ARRAY_SIZE macro, something like this.

/* Check whether this EC instance handles CEC */
if (cros_ec_check_features(ec, EC_FEATURE_CEC)) {
        retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
                                                  cros_ec_cec_cells,
                                                  ARRAY_SIZE(cros_ec_cec_cells),
                                                  NULL, 0, NULL);
        if (retval)
                dev_err(ec->dev, "failed to add cros-ec-cec device: %d\n",
                             retval);
}

Best regards,
  Enric

>>       /* Take control of the lightbar from the EC. */
>>       lb_manual_suspend_ctrl(ec, 1);
>>
>>
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Neil Armstrong]

Hi Ville,

On 15/05/2018 17:35, Ville Syrjälä wrote:
> On Tue, May 15, 2018 at 04:42:19PM +0200, Neil Armstrong wrote:
>> This patchs adds the cec_notifier feature to the intel_hdmi part
>> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
>> between each HDMI ports.
>> The changes will allow the i915 HDMI code to notify EDID and HPD changes
>> to an eventual CEC adapter.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>>  drivers/gpu/drm/i915/Kconfig      |  1 +
>>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
>>  3 files changed, 15 insertions(+)
>>

[..]

>>  }
>>  
>> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>>  
>>  static void intel_hdmi_destroy(struct drm_connector *connector)
>>  {
>> +	if (intel_attached_hdmi(connector)->notifier)
>> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>>  	kfree(to_intel_connector(connector)->detect_edid);
>>  	drm_connector_cleanup(connector);
>>  	kfree(connector);
>> @@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>>  	}
>> +
>> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
> 
> What are we doing with the connector name here? Those are not actually
> guaranteed to be stable, and any change in the connector probe order
> may cause the name to change.

The i915 driver can expose multiple HDMI connectors, but each connected will
have a different EDID and CEC physical address, so we will need a different notifier
for each connector.

The connector name is DRM dependent, but user-space actually uses this name for
operations, so I supposed it was kind of stable.

Anyway, is there another stable id/name/whatever that can be used to make a name to
distinguish the HDMI connectors ?

Neil

> 
>> +	if (!intel_hdmi->notifier)
>> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
>>  }
>>  
>>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
>> -- 
>> 2.7.4
>>
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 

Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Neil Armstrong]

On 16/05/2018 09:31, Neil Armstrong wrote:
> Hi Ville,
> 
> On 15/05/2018 17:35, Ville Syrjälä wrote:
>> On Tue, May 15, 2018 at 04:42:19PM +0200, Neil Armstrong wrote:
>>> This patchs adds the cec_notifier feature to the intel_hdmi part
>>> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
>>> between each HDMI ports.
>>> The changes will allow the i915 HDMI code to notify EDID and HPD changes
>>> to an eventual CEC adapter.
>>>
>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>>> ---
>>>  drivers/gpu/drm/i915/Kconfig      |  1 +
>>>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>>>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
>>>  3 files changed, 15 insertions(+)
>>>
> 
> [..]
> 
>>>  }
>>>  
>>> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>>>  
>>>  static void intel_hdmi_destroy(struct drm_connector *connector)
>>>  {
>>> +	if (intel_attached_hdmi(connector)->notifier)
>>> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>>>  	kfree(to_intel_connector(connector)->detect_edid);
>>>  	drm_connector_cleanup(connector);
>>>  	kfree(connector);
>>> @@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>>>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>>>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>>>  	}
>>> +
>>> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
>>
>> What are we doing with the connector name here? Those are not actually
>> guaranteed to be stable, and any change in the connector probe order
>> may cause the name to change.
> 
> The i915 driver can expose multiple HDMI connectors, but each connected will
> have a different EDID and CEC physical address, so we will need a different notifier
> for each connector.
> 
> The connector name is DRM dependent, but user-space actually uses this name for
> operations, so I supposed it was kind of stable.
> 
> Anyway, is there another stable id/name/whatever that can be used to make a name to
> distinguish the HDMI connectors ?

Would "HDMI %c", port_name(port) be OK to use ?

Neil

> 
> Neil
> 
>>
>>> +	if (!intel_hdmi->notifier)
>>> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
>>>  }
>>>  
>>>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
>>> -- 
>>> 2.7.4
>>>
>>> _______________________________________________
>>> Intel-gfx mailing list
>>> Intel-gfx@lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>>
> 

Re: [PATCH v2 4/5] mfd: cros_ec_dev: Add CEC sub-device registration

[Neil Armstrong]

Hi Enric,

On 15/05/2018 18:40, Enric Balletbo Serra wrote:
> Hi Neil,
> 
> I suspect that this patch will conflict with some patches that will be
> queued for 4.18 that also introduces new devices, well, for now I
> don't see these merged in the Lee's tree.

Indeed, I found your patches, I'll rebase this one when Lee pushes them in his tree.

> 
> Based on some reviews I got when I send a patch to this file ...
> 
> 2018-05-15 17:29 GMT+02:00 Hans Verkuil <hverkuil@xs4all.nl>:
>> On 05/15/2018 04:42 PM, Neil Armstrong wrote:
>>> The EC can expose a CEC bus, thus add the cros-ec-cec MFD sub-device
>>> when the CEC feature bit is present.
>>>
>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>>
>> For what it is worth (not an MFD expert):
>>
>> Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
>>
>> Thanks!
>>
>>         Hans
>>
>>> ---
>>>  drivers/mfd/cros_ec_dev.c | 16 ++++++++++++++++
>>>  1 file changed, 16 insertions(+)
>>>
>>> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
>>> index eafd06f..57064ec 100644
>>> --- a/drivers/mfd/cros_ec_dev.c
>>> +++ b/drivers/mfd/cros_ec_dev.c
>>> @@ -383,6 +383,18 @@ static void cros_ec_sensors_register(struct cros_ec_dev *ec)
>>>       kfree(msg);
>>>  }
>>>
>>> +static void cros_ec_cec_register(struct cros_ec_dev *ec)
>>> +{
>>> +     int ret;
>>> +     struct mfd_cell cec_cell = {
>>> +             .name = "cros-ec-cec",
>>> +     };
>>> +
>>> +     ret = mfd_add_devices(ec->dev, 0, &cec_cell, 1, NULL, 0, NULL);
>>> +     if (ret)
>>> +             dev_err(ec->dev, "failed to add EC CEC\n");
>>> +}
>>> +
> 
> Do not create a single function to only call mfd_add_devices, instead
> do the following on top:
> 
> static const struct mfd_cell cros_ec_cec_cells[] = {
>         { .name = "cros-ec-cec" }
> };

OK

> 
> 
>>>  static int ec_device_probe(struct platform_device *pdev)
>>>  {
>>>       int retval = -ENOMEM;
>>> @@ -422,6 +434,10 @@ static int ec_device_probe(struct platform_device *pdev)
>>>       if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
>>>               cros_ec_sensors_register(ec);
>>>
>>> +     /* check whether this EC handles CEC. */
>>> +     if (cros_ec_check_features(ec, EC_FEATURE_CEC))
>>> +             cros_ec_cec_register(ec);
>>> +
> 
> and use PLATFORM_DEVID_AUTO and the ARRAY_SIZE macro, something like this.
> 
> /* Check whether this EC instance handles CEC */
> if (cros_ec_check_features(ec, EC_FEATURE_CEC)) {
>         retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
>                                                   cros_ec_cec_cells,
>                                                   ARRAY_SIZE(cros_ec_cec_cells),
>                                                   NULL, 0, NULL);
>         if (retval)
>                 dev_err(ec->dev, "failed to add cros-ec-cec device: %d\n",
>                              retval);
> }

Ok, like the RTC registration.

Thanks,
Neil

> 
> Best regards,
>   Enric
> 
>>>       /* Take control of the lightbar from the EC. */
>>>       lb_manual_suspend_ctrl(ec, 1);
>>>
>>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH v2 3/5] mfd: cros-ec: Introduce CEC commands and events definitions.

[Neil Armstrong]

Hi Hans,

On 15/05/2018 17:28, Hans Verkuil wrote:
> On 05/15/2018 04:42 PM, Neil Armstrong wrote:
>> The EC can expose a CEC bus, this patch adds the CEC related definitions
>> needed by the cros-ec-cec driver.
>> Having a 16 byte mkbp event size makes it possible to send CEC
>> messages from the EC to the AP directly inside the mkbp event
>> instead of first doing a notification and then a read.
>>
>> Signed-off-by: Stefan Adolfsson <sadolfsson@chromium.org>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>>  drivers/platform/chrome/cros_ec_proto.c | 42 +++++++++++++----
>>  include/linux/mfd/cros_ec.h             |  2 +-
>>  include/linux/mfd/cros_ec_commands.h    | 80 +++++++++++++++++++++++++++++++++
>>  3 files changed, 114 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
>> index e7bbdf9..ba47f79 100644
>> --- a/drivers/platform/chrome/cros_ec_proto.c
>> +++ b/drivers/platform/chrome/cros_ec_proto.c
>> @@ -504,29 +504,53 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
>>  }
>>  EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
>>  
>> +static int get_next_event_xfer(struct cros_ec_device *ec_dev,
>> +			       struct cros_ec_command *msg,
>> +			       int version, uint32_t size)
>> +{
>> +	int ret;
>> +
>> +	msg->version = version;
>> +	msg->command = EC_CMD_GET_NEXT_EVENT;
>> +	msg->insize = size;
>> +	msg->outsize = 0;
>> +
>> +	ret = cros_ec_cmd_xfer(ec_dev, msg);
>> +	if (ret > 0) {
>> +		ec_dev->event_size = ret - 1;
>> +		memcpy(&ec_dev->event_data, msg->data, size);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>>  static int get_next_event(struct cros_ec_device *ec_dev)
>>  {
>>  	u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)];
>>  	struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
>> +	static int cmd_version = 1;
>>  	int ret;
>>  
>> +	BUILD_BUG_ON(sizeof(union ec_response_get_next_data_v1) != 16);
> 
> Use the define instead of hardcoding 16. I'm not really sure why you need this.
> If cec_message uses the right define for the array size (see my comment below),
> then this really can't go wrong, can it?

This is taken from the chrome kernelk, to be sure the size is ok, but yes it should be 16, I'll see
if I can drop this.

> 
>> +
>>  	if (ec_dev->suspended) {
>>  		dev_dbg(ec_dev->dev, "Device suspended.\n");
>>  		return -EHOSTDOWN;
>>  	}
>>  
>> -	msg->version = 0;
>> -	msg->command = EC_CMD_GET_NEXT_EVENT;
>> -	msg->insize = sizeof(ec_dev->event_data);
>> -	msg->outsize = 0;
>> +	if (cmd_version == 1) {
>> +		ret = get_next_event_xfer(ec_dev, msg, cmd_version,
>> +					  sizeof(ec_dev->event_data));
>> +		if (ret != EC_RES_INVALID_VERSION)
>> +			return ret;
>>  
>> -	ret = cros_ec_cmd_xfer(ec_dev, msg);
>> -	if (ret > 0) {
>> -		ec_dev->event_size = ret - 1;
>> -		memcpy(&ec_dev->event_data, msg->data,
>> -		       sizeof(ec_dev->event_data));
>> +		/* Fallback to version 0 for future send attempts */
>> +		cmd_version = 0;
>>  	}
>>  
>> +	ret = get_next_event_xfer(ec_dev, msg, cmd_version,
>> +				  sizeof(struct ec_response_get_next_event));
>> +
>>  	return ret;
>>  }
>>  
>> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
>> index 2d4e23c..f3415eb 100644
>> --- a/include/linux/mfd/cros_ec.h
>> +++ b/include/linux/mfd/cros_ec.h
>> @@ -147,7 +147,7 @@ struct cros_ec_device {
>>  	bool mkbp_event_supported;
>>  	struct blocking_notifier_head event_notifier;
>>  
>> -	struct ec_response_get_next_event event_data;
>> +	struct ec_response_get_next_event_v1 event_data;
>>  	int event_size;
>>  	u32 host_event_wake_mask;
>>  };
>> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
>> index f2edd99..18df466 100644
>> --- a/include/linux/mfd/cros_ec_commands.h
>> +++ b/include/linux/mfd/cros_ec_commands.h
>> @@ -804,6 +804,8 @@ enum ec_feature_code {
>>  	EC_FEATURE_MOTION_SENSE_FIFO = 24,
>>  	/* EC has RTC feature that can be controlled by host commands */
>>  	EC_FEATURE_RTC = 27,
>> +	/* EC supports CEC commands */
>> +	EC_FEATURE_CEC = 35,
>>  };
>>  
>>  #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
>> @@ -2078,6 +2080,12 @@ enum ec_mkbp_event {
>>  	/* EC sent a sysrq command */
>>  	EC_MKBP_EVENT_SYSRQ = 6,
>>  
>> +	/* Notify the AP that something happened on CEC */
>> +	EC_MKBP_CEC_EVENT = 8,
>> +
>> +	/* Send an incoming CEC message to the AP */
>> +	EC_MKBP_EVENT_CEC_MESSAGE = 9,
>> +
>>  	/* Number of MKBP events */
>>  	EC_MKBP_EVENT_COUNT,
>>  };
>> @@ -2093,12 +2101,31 @@ union ec_response_get_next_data {
>>  	uint32_t   sysrq;
>>  } __packed;
>>  
>> +union ec_response_get_next_data_v1 {
>> +	uint8_t   key_matrix[16];
>> +
>> +	/* Unaligned */
>> +	uint32_t  host_event;
>> +
>> +	uint32_t   buttons;
>> +	uint32_t   switches;
>> +	uint32_t   sysrq;
>> +	uint32_t   cec_events;
>> +	uint8_t    cec_message[16];
>> +} __packed;
>> +
>>  struct ec_response_get_next_event {
>>  	uint8_t event_type;
>>  	/* Followed by event data if any */
>>  	union ec_response_get_next_data data;
>>  } __packed;
>>  
>> +struct ec_response_get_next_event_v1 {
>> +	uint8_t event_type;
>> +	/* Followed by event data if any */
>> +	union ec_response_get_next_data_v1 data;
>> +} __packed;
>> +
>>  /* Bit indices for buttons and switches.*/
>>  /* Buttons */
>>  #define EC_MKBP_POWER_BUTTON	0
>> @@ -2828,6 +2855,59 @@ struct ec_params_reboot_ec {
>>  /* Current version of ACPI memory address space */
>>  #define EC_ACPI_MEM_VERSION_CURRENT 1
>>  
>> +/*****************************************************************************/
>> +/*
>> + * HDMI CEC commands
>> + *
>> + * These commands are for sending and receiving message via HDMI CEC
>> + */
>> +#define MAX_CEC_MSG_LEN 16
> 
> Hmm, uapi/linux/cec.h already defines CEC_MAX_MSG_SIZE with the same value.
> Perhaps it is better to include linux/cec.h here instead of creating a second
> define?
> 
> And shouldn't this define also be used for the cec_message array above?

These defines are tied to the Embedded Controller API, so it may be goog to keep them
separated from the rest of the Linux APO, I'll see about using the define in the event
struct, but I think they want to have a formal array size using a number.

Neil

> 
> Regards,
> 
> 	Hans
> 
>> +
>> +/* CEC message from the AP to be written on the CEC bus */
>> +#define EC_CMD_CEC_WRITE_MSG 0x00B8
>> +
>> +/* Message to write to the CEC bus */
>> +struct ec_params_cec_write {
>> +	uint8_t msg[MAX_CEC_MSG_LEN];
>> +} __packed;
>> +
>> +/* Set various CEC parameters */
>> +#define EC_CMD_CEC_SET 0x00BA
>> +
>> +struct ec_params_cec_set {
>> +	uint8_t cmd; /* enum cec_command */
>> +	union {
>> +		uint8_t enable;
>> +		uint8_t address;
>> +	};
>> +} __packed;
>> +
>> +/* Read various CEC parameters */
>> +#define EC_CMD_CEC_GET 0x00BB
>> +
>> +struct ec_params_cec_get {
>> +	uint8_t cmd; /* enum cec_command */
>> +} __packed;
>> +
>> +struct ec_response_cec_get {
>> +	union {
>> +		uint8_t enable;
>> +		uint8_t address;
>> +	};
>> +} __packed;
>> +
>> +enum cec_command {
>> +	/* CEC reading, writing and events enable */
>> +	CEC_CMD_ENABLE,
>> +	/* CEC logical address  */
>> +	CEC_CMD_LOGICAL_ADDRESS,
>> +};
>> +
>> +/* Events from CEC to AP */
>> +enum mkbp_cec_event {
>> +	EC_MKBP_CEC_SEND_OK			= 1 << 0,
>> +	EC_MKBP_CEC_SEND_FAILED			= 1 << 1,
>> +};
>>  
>>  /*****************************************************************************/
>>  /*
>>
> 

Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Ville Syrjälä]

On Wed, May 16, 2018 at 09:40:17AM +0200, Neil Armstrong wrote:
> On 16/05/2018 09:31, Neil Armstrong wrote:
> > Hi Ville,
> > 
> > On 15/05/2018 17:35, Ville Syrjälä wrote:
> >> On Tue, May 15, 2018 at 04:42:19PM +0200, Neil Armstrong wrote:
> >>> This patchs adds the cec_notifier feature to the intel_hdmi part
> >>> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
> >>> between each HDMI ports.
> >>> The changes will allow the i915 HDMI code to notify EDID and HPD changes
> >>> to an eventual CEC adapter.
> >>>
> >>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> >>> ---
> >>>  drivers/gpu/drm/i915/Kconfig      |  1 +
> >>>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
> >>>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
> >>>  3 files changed, 15 insertions(+)
> >>>
> > 
> > [..]
> > 
> >>>  }
> >>>  
> >>> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
> >>>  
> >>>  static void intel_hdmi_destroy(struct drm_connector *connector)
> >>>  {
> >>> +	if (intel_attached_hdmi(connector)->notifier)
> >>> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
> >>>  	kfree(to_intel_connector(connector)->detect_edid);
> >>>  	drm_connector_cleanup(connector);
> >>>  	kfree(connector);
> >>> @@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> >>>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
> >>>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
> >>>  	}
> >>> +
> >>> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
> >>
> >> What are we doing with the connector name here? Those are not actually
> >> guaranteed to be stable, and any change in the connector probe order
> >> may cause the name to change.
> > 
> > The i915 driver can expose multiple HDMI connectors, but each connected will
> > have a different EDID and CEC physical address, so we will need a different notifier
> > for each connector.
> > 
> > The connector name is DRM dependent, but user-space actually uses this name for
> > operations, so I supposed it was kind of stable.
> > 
> > Anyway, is there another stable id/name/whatever that can be used to make a name to
> > distinguish the HDMI connectors ?
> 
> Would "HDMI %c", port_name(port) be OK to use ?

Yeah, something like seems like a reasonable approach. That does mean
we have to be a little careful with changing enum port or port_name()
in the future, but I guess we could just add a small function to
generated the name/id specifically for this thing.

We're also going to have to think what to do with enum port and
port_name() on ICL+ though. There we won't just have A-F but also
TC1-TC<n>. Hmm. Looks like what we have for those ports in our
codebase ATM is a bit wonky since we haven't even changed
port_name() to give us the TC<n> type names.

Also we might not want "HDMI" in the identifier since the physical
port is not HDMI specific. There are different things we could call
these but I think we could just go with a generic "Port A-F" and
"Port TC1-TC<n>" approach. I think something like that should work
fine for current and upcoming hardware. And in theory that could
then be used for other things as well which need a stable
identifier.

Oh, and now I recall that input subsystem at least has some kind
of "physical path" property on devices. So I guess what we're
dicussing is a somewhat similar idea. I think input drivers
generally include the pci/usb/etc. device in the path as well.
Even though we currently only ever have the one pci device it
would seem like decent idea to include that information in our
identifiers as well. Or what do you think?

-- 
Ville Syrjälä
Intel

Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

[Neil Armstrong]

Hi Ville,

On 16/05/2018 16:07, Ville Syrjälä wrote:
> On Wed, May 16, 2018 at 09:40:17AM +0200, Neil Armstrong wrote:
>> On 16/05/2018 09:31, Neil Armstrong wrote:
>>> Hi Ville,
>>>
>>> On 15/05/2018 17:35, Ville Syrjälä wrote:
>>>> On Tue, May 15, 2018 at 04:42:19PM +0200, Neil Armstrong wrote:
>>>>> This patchs adds the cec_notifier feature to the intel_hdmi part
>>>>> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
>>>>> between each HDMI ports.
>>>>> The changes will allow the i915 HDMI code to notify EDID and HPD changes
>>>>> to an eventual CEC adapter.
>>>>>
>>>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>>>>> ---
>>>>>  drivers/gpu/drm/i915/Kconfig      |  1 +
>>>>>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>>>>>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
>>>>>  3 files changed, 15 insertions(+)
>>>>>
>>>
>>> [..]
>>>
>>>>>  }
>>>>>  
>>>>> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>>>>>  
>>>>>  static void intel_hdmi_destroy(struct drm_connector *connector)
>>>>>  {
>>>>> +	if (intel_attached_hdmi(connector)->notifier)
>>>>> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>>>>>  	kfree(to_intel_connector(connector)->detect_edid);
>>>>>  	drm_connector_cleanup(connector);
>>>>>  	kfree(connector);
>>>>> @@ -2358,6 +2366,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>>>>>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>>>>>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>>>>>  	}
>>>>> +
>>>>> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
>>>>
>>>> What are we doing with the connector name here? Those are not actually
>>>> guaranteed to be stable, and any change in the connector probe order
>>>> may cause the name to change.
>>>
>>> The i915 driver can expose multiple HDMI connectors, but each connected will
>>> have a different EDID and CEC physical address, so we will need a different notifier
>>> for each connector.
>>>
>>> The connector name is DRM dependent, but user-space actually uses this name for
>>> operations, so I supposed it was kind of stable.
>>>
>>> Anyway, is there another stable id/name/whatever that can be used to make a name to
>>> distinguish the HDMI connectors ?
>>
>> Would "HDMI %c", port_name(port) be OK to use ?
> 
> Yeah, something like seems like a reasonable approach. That does mean
> we have to be a little careful with changing enum port or port_name()
> in the future, but I guess we could just add a small function to
> generated the name/id specifically for this thing.
> 
> We're also going to have to think what to do with enum port and
> port_name() on ICL+ though. There we won't just have A-F but also
> TC1-TC<n>. Hmm. Looks like what we have for those ports in our
> codebase ATM is a bit wonky since we haven't even changed
> port_name() to give us the TC<n> type names.
> 
> Also we might not want "HDMI" in the identifier since the physical
> port is not HDMI specific. There are different things we could call
> these but I think we could just go with a generic "Port A-F" and
> "Port TC1-TC<n>" approach. I think something like that should work
> fine for current and upcoming hardware. And in theory that could
> then be used for other things as well which need a stable
> identifier.
> 
> Oh, and now I recall that input subsystem at least has some kind
> of "physical path" property on devices. So I guess what we're
> dicussing is a somewhat similar idea. I think input drivers
> generally include the pci/usb/etc. device in the path as well.
> Even though we currently only ever have the one pci device it
> would seem like decent idea to include that information in our
> identifiers as well. Or what do you think?
> 

Thanks for the clarifications !

Having a "Port <id>" will be great indeed, no need to specify HDMI since
only HDMI connectors will get a CEC notifier anyway.

The issue is that port_name() returns a character, which is lame.
Would it be acceptable to introduce a :

const char *port_identifier(struct drm_i915_private *dev_priv,
			    enum port port)
{
	char *id = devm_kzalloc(dev_priv->drm->dev, 16, GFP_KERNEL);

	if (id)
		return NULL;

	snprintf("Port %c", port_name(port));

	return id;
}

and use the result of this for the cec_notifier connector name ?

Neil

Re: [Intel-gfx] [PATCH v2 5/5] media: platform: Add Chrome OS EC CEC driver

[kbuild test robot]

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Hi Neil,

I love your patch! Yet something to improve:

[auto build test ERROR on linuxtv-media/master]
[also build test ERROR on v4.17-rc5 next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Neil-Armstrong/Add-ChromeOS-EC-CEC-Support/20180516-180519
base:   git://linuxtv.org/media_tree.git master
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   drivers/media//platform/cros-ec-cec/cros-ec-cec.c: In function 'cros_ec_cec_get_notifier':
>> drivers/media//platform/cros-ec-cec/cros-ec-cec.c:231:33: error: 'pci_bus_type' undeclared (first use in this function); did you mean 'pci_pcie_type'?
       d = bus_find_device_by_name(&pci_bus_type, NULL,
                                    ^~~~~~~~~~~~
                                    pci_pcie_type
   drivers/media//platform/cros-ec-cec/cros-ec-cec.c:231:33: note: each undeclared identifier is reported only once for each function it appears in

vim +231 drivers/media//platform/cros-ec-cec/cros-ec-cec.c

   217	
   218	static int cros_ec_cec_get_notifier(struct device *dev,
   219					    struct cec_notifier **notify)
   220	{
   221		int i;
   222	
   223		for (i = 0 ; i < ARRAY_SIZE(cec_dmi_match_table) ; ++i) {
   224			const struct cec_dmi_match *m = &cec_dmi_match_table[i];
   225	
   226			if (dmi_match(DMI_SYS_VENDOR, m->sys_vendor) &&
   227			    dmi_match(DMI_PRODUCT_NAME, m->product_name)) {
   228				struct device *d;
   229	
   230				/* Find the device, bail out if not yet registered */
 > 231				d = bus_find_device_by_name(&pci_bus_type, NULL,
   232							    m->devname);
   233				if (!d)
   234					return -EPROBE_DEFER;
   235	
   236				*notify = cec_notifier_get_conn(d, m->conn);
   237				return 0;
   238			}
   239		}
   240	
   241		/* Hardware support must be added in the cec_dmi_match_table */
   242		dev_warn(dev, "CEC notifier not configured for this hardware\n");
   243	
   244		return -ENODEV;
   245	}
   246	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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