Merge branch 'for-5.14/intel-ish' into for-linus

- support for ISH DMA on EHL platform from Even Xu
- various code style fixes and cleanups from Lee Jones and Uwe Kleine-König

Author: Jiri Kosina

drivers/hid/intel-ish-hid/Kconfig

@@ -5,6 +5,7 @@ menu "Intel ISH HID support"
 config INTEL_ISH_HID
 	tristate "Intel Integrated Sensor Hub"
 	default n
+	depends on X86
 	select HID
 	help
 	  The Integrated Sensor Hub (ISH) enables the ability to offload

drivers/hid/intel-ish-hid/ipc/ipc.c

@@ -544,7 +544,7 @@ static int ish_fw_reset_handler(struct ishtp_device *dev)
 #define TIMEOUT_FOR_HW_RDY_MS			300
 
 /**
- * ish_fw_reset_work_fn() - FW reset worker function
+ * fw_reset_work_fn() - FW reset worker function
  * @unused: not used
  *
  * Call ish_fw_reset_handler to complete FW reset
@@ -889,6 +889,29 @@ static uint32_t ish_ipc_get_header(struct ishtp_device *dev, int length,
 	return drbl_val;
 }
 
+/**
+ * _dma_no_cache_snooping()
+ *
+ * Check on current platform, DMA supports cache snooping or not.
+ * This callback is used to notify uplayer driver if manully cache
+ * flush is needed when do DMA operation.
+ *
+ * Please pay attention to this callback implementation, if declare
+ * having cache snooping on a cache snooping not supported platform
+ * will cause uplayer driver receiving mismatched data; and if
+ * declare no cache snooping on a cache snooping supported platform
+ * will cause cache be flushed twice and performance hit.
+ *
+ * @dev: ishtp device pointer
+ *
+ * Return: false - has cache snooping capability
+ *         true - no cache snooping, need manually cache flush
+ */
+static bool _dma_no_cache_snooping(struct ishtp_device *dev)
+{
+	return dev->pdev->device == EHL_Ax_DEVICE_ID;
+}
+
 static const struct ishtp_hw_ops ish_hw_ops = {
 	.hw_reset = _ish_hw_reset,
 	.ipc_reset = _ish_ipc_reset,
@@ -897,7 +920,8 @@ static const struct ishtp_hw_ops ish_hw_ops = {
 	.write = write_ipc_to_queue,
 	.get_fw_status = _ish_read_fw_sts_reg,
 	.sync_fw_clock = _ish_sync_fw_clock,
-	.ishtp_read_hdr = _ishtp_read_hdr
+	.ishtp_read_hdr = _ishtp_read_hdr,
+	.dma_no_cache_snooping = _dma_no_cache_snooping
 };
 
 /**

drivers/hid/intel-ish-hid/ipc/pci-ish.c

@@ -263,7 +263,6 @@ static void __maybe_unused ish_resume_handler(struct work_struct *work)
 	struct pci_dev *pdev = to_pci_dev(ish_resume_device);
 	struct ishtp_device *dev = pci_get_drvdata(pdev);
 	uint32_t fwsts = dev->ops->get_fw_status(dev);
-	int ret;
 
 	if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag
 			&& IPC_IS_ISH_ILUP(fwsts)) {
@@ -275,7 +274,7 @@ static void __maybe_unused ish_resume_handler(struct work_struct *work)
 
 		/* Waiting to get resume response */
 		if (dev->resume_flag)
-			ret = wait_event_interruptible_timeout(dev->resume_wait,
+			wait_event_interruptible_timeout(dev->resume_wait,
 				!dev->resume_flag,
 				msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
 

drivers/hid/intel-ish-hid/ishtp-fw-loader.c

@@ -31,13 +31,13 @@
 
 /**
  * enum ish_loader_commands -	ISH loader host commands.
- * LOADER_CMD_XFER_QUERY	Query the Shim firmware loader for
+ * @LOADER_CMD_XFER_QUERY:	Query the Shim firmware loader for
  *				capabilities
- * LOADER_CMD_XFER_FRAGMENT	Transfer one firmware image fragment at a
+ * @LOADER_CMD_XFER_FRAGMENT:	Transfer one firmware image fragment at a
  *				time. The command may be executed
  *				multiple times until the entire firmware
  *				image is downloaded to SRAM.
- * LOADER_CMD_START		Start executing the main firmware.
+ * @LOADER_CMD_START:		Start executing the main firmware.
  */
 enum ish_loader_commands {
 	LOADER_CMD_XFER_QUERY = 0,
@@ -95,6 +95,7 @@ static int dma_buf_size_limit = 4 * PAGE_SIZE;
 /**
  * struct loader_msg_hdr - Header for ISH Loader commands.
  * @command:		LOADER_CMD* commands. Bit 7 is the response.
+ * @reserved:		Reserved space
  * @status:		Command response status. Non 0, is error
  *			condition.
  *
@@ -173,16 +174,16 @@ struct loader_start {
  * struct response_info - Encapsulate firmware response related
  *			information for passing between function
  *			loader_cl_send() and process_recv() callback.
- * @data		Copy the data received from firmware here.
- * @max_size		Max size allocated for the @data buffer. If the
+ * @data:		Copy the data received from firmware here.
+ * @max_size:		Max size allocated for the @data buffer. If the
  *			received data exceeds this value, we log an
  *			error.
- * @size		Actual size of data received from firmware.
- * @error		Returns 0 for success, negative error code for a
+ * @size:		Actual size of data received from firmware.
+ * @error:		Returns 0 for success, negative error code for a
  *			failure in function process_recv().
- * @received		Set to true on receiving a valid firmware
+ * @received:		Set to true on receiving a valid firmware
  *			response to host command
- * @wait_queue		Wait queue for Host firmware loading where the
+ * @wait_queue:		Wait queue for Host firmware loading where the
  *			client sends message to ISH firmware and waits
  *			for response
  */
@@ -195,13 +196,13 @@ struct response_info {
 	wait_queue_head_t wait_queue;
 };
 
-/**
+/*
  * struct ishtp_cl_data - Encapsulate per ISH-TP Client Data.
  * @work_ishtp_reset:	Work queue for reset handling.
  * @work_fw_load:	Work queue for host firmware loading.
- * @flag_retry		Flag for indicating host firmware loading should
+ * @flag_retry:		Flag for indicating host firmware loading should
  *			be retried.
- * @retry_count		Count the number of retries.
+ * @retry_count:	Count the number of retries.
  *
  * This structure is used to store data per client.
  */
@@ -240,8 +241,8 @@ struct ishtp_cl_data {
 /**
  * get_firmware_variant() - Gets the filename of firmware image to be
  *			loaded based on platform variant.
- * @client_data		Client data instance.
- * @filename		Returns firmware filename.
+ * @client_data:	Client data instance.
+ * @filename:		Returns firmware filename.
  *
  * Queries the firmware-name device property string.
  *
@@ -266,11 +267,11 @@ static int get_firmware_variant(struct ishtp_cl_data *client_data,
 /**
  * loader_cl_send()	Send message from host to firmware
  * @client_data:	Client data instance
- * @out_msg		Message buffer to be sent to firmware
- * @out_size		Size of out going message
- * @in_msg		Message buffer where the incoming data copied.
+ * @out_msg:		Message buffer to be sent to firmware
+ * @out_size:		Size of out going message
+ * @in_msg:		Message buffer where the incoming data copied.
  *			This buffer is allocated by calling
- * @in_size		Max size of incoming message
+ * @in_size:		Max size of incoming message
  *
  * Return: Number of bytes copied in the in_msg on success, negative
  * error code on failure.
@@ -435,7 +436,7 @@ static void process_recv(struct ishtp_cl *loader_ishtp_cl,
 
 /**
  * loader_cl_event_cb() - bus driver callback for incoming message
- * @device:		Pointer to the ishtp client device for which this
+ * @cl_device:		Pointer to the ishtp client device for which this
  *			message is targeted
  *
  * Remove the packet from the list and process the message by calling
@@ -536,7 +537,7 @@ static int ish_query_loader_prop(struct ishtp_cl_data *client_data,
 }
 
 /**
- * ish_fw_xfer_ishtp()	Loads ISH firmware using ishtp interface
+ * ish_fw_xfer_ishtp() - Loads ISH firmware using ishtp interface
  * @client_data:	Client data instance
  * @fw:			Pointer to firmware data struct in host memory
  *
@@ -733,7 +734,7 @@ static int ish_fw_xfer_direct_dma(struct ishtp_cl_data *client_data,
 }
 
 /**
- * ish_fw_start()	Start executing ISH main firmware
+ * ish_fw_start() -	Start executing ISH main firmware
  * @client_data:	client data instance
  *
  * This function sends message to Shim firmware loader to start
@@ -756,7 +757,7 @@ static int ish_fw_start(struct ishtp_cl_data *client_data)
 }
 
 /**
- * load_fw_from_host()	Loads ISH firmware from host
+ * load_fw_from_host() - Loads ISH firmware from host
  * @client_data:	Client data instance
  *
  * This function loads the ISH firmware to ISH SRAM and starts execution
@@ -1015,7 +1016,7 @@ static int loader_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
  *
  * Return: 0
  */
-static int loader_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
+static void loader_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 {
 	struct ishtp_cl_data *client_data;
 	struct ishtp_cl	*loader_ishtp_cl = ishtp_get_drvdata(cl_device);
@@ -1032,8 +1033,6 @@ static int loader_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 	cancel_work_sync(&client_data->work_ishtp_reset);
 	loader_deinit(loader_ishtp_cl);
 	ishtp_put_device(cl_device);
-
-	return 0;
 }
 
 /**

drivers/hid/intel-ish-hid/ishtp-hid-client.c

@@ -11,14 +11,19 @@
 #include <linux/sched.h>
 #include "ishtp-hid.h"
 
+/* ISH Transport protocol (ISHTP in short) GUID */
+static const guid_t hid_ishtp_guid =
+	GUID_INIT(0x33AECD58, 0xB679, 0x4E54,
+		  0x9B, 0xD9, 0xA0, 0x4D, 0x34, 0xF0, 0xC2, 0x26);
+
 /* Rx ring buffer pool size */
 #define HID_CL_RX_RING_SIZE	32
 #define HID_CL_TX_RING_SIZE	16
 
 #define cl_data_to_dev(client_data) ishtp_device(client_data->cl_device)
 
 /**
- * report_bad_packets() - Report bad packets
+ * report_bad_packet() - Report bad packets
  * @hid_ishtp_cl:	Client instance to get stats
  * @recv_buf:		Raw received host interface message
  * @cur_pos:		Current position index in payload
@@ -779,7 +784,7 @@ static void hid_ishtp_cl_reset_handler(struct work_struct *work)
 	}
 }
 
-void (*hid_print_trace)(void *unused, const char *format, ...);
+ishtp_print_log ishtp_hid_print_trace;
 
 /**
  * hid_ishtp_cl_probe() - ISHTP client driver probe
@@ -818,7 +823,7 @@ static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
 
 	INIT_WORK(&client_data->work, hid_ishtp_cl_reset_handler);
 
-	hid_print_trace = ishtp_trace_callback(cl_device);
+	ishtp_hid_print_trace = ishtp_trace_callback(cl_device);
 
 	rv = hid_ishtp_cl_init(hid_ishtp_cl, 0);
 	if (rv) {
@@ -838,7 +843,7 @@ static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
  *
  * Return: 0
  */
-static int hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
+static void hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 {
 	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
@@ -856,8 +861,6 @@ static int hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 	hid_ishtp_cl = NULL;
 
 	client_data->num_hid_devices = 0;
-
-	return 0;
 }
 
 /**

drivers/hid/intel-ish-hid/ishtp-hid.c

@@ -254,7 +254,7 @@ int ishtp_hid_probe(unsigned int cur_hid_dev,
 }
 
 /**
- * ishtp_hid_probe() - Remove registered hid device
+ * ishtp_hid_remove() - Remove registered hid device
  * @client_data:	client data pointer
  *
  * This function is used to destroy allocatd HID device.

drivers/hid/intel-ish-hid/ishtp-hid.h

@@ -16,14 +16,9 @@
 #define	IS_RESPONSE	0x80
 
 /* Used to dump to Linux trace buffer, if enabled */
-extern void (*hid_print_trace)(void *unused, const char *format, ...);
+extern ishtp_print_log ishtp_hid_print_trace;
 #define hid_ishtp_trace(client, ...) \
-		(hid_print_trace)(NULL, __VA_ARGS__)
-
-/* ISH Transport protocol (ISHTP in short) GUID */
-static const guid_t hid_ishtp_guid =
-	GUID_INIT(0x33AECD58, 0xB679, 0x4E54,
-		  0x9B, 0xD9, 0xA0, 0x4D, 0x34, 0xF0, 0xC2, 0x26);
+	(ishtp_hid_print_trace)(NULL, __VA_ARGS__)
 
 /* ISH HID message structure */
 struct hostif_msg_hdr {

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -164,6 +164,7 @@ EXPORT_SYMBOL(ishtp_fw_cl_get_client);
 
 /**
  * ishtp_get_fw_client_id() - Get fw client id
+ * @fw_client:	firmware client used to fetch the ID
  *
  * This interface is used to reset HW get FW client id.
  *
@@ -257,24 +258,17 @@ static int ishtp_cl_bus_match(struct device *dev, struct device_driver *drv)
 static int ishtp_cl_device_remove(struct device *dev)
 {
 	struct ishtp_cl_device *device = to_ishtp_cl_device(dev);
-	struct ishtp_cl_driver *driver;
-
-	if (!device || !dev->driver)
-		return 0;
+	struct ishtp_cl_driver *driver = to_ishtp_cl_driver(dev->driver);
 
 	if (device->event_cb) {
 		device->event_cb = NULL;
 		cancel_work_sync(&device->event_work);
 	}
 
-	driver = to_ishtp_cl_driver(dev->driver);
-	if (!driver->remove) {
-		dev->driver = NULL;
+	if (driver->remove)
+		driver->remove(device);
 
-		return 0;
-	}
-
-	return driver->remove(device);
+	return 0;
 }
 
 /**
@@ -842,6 +836,7 @@ int ishtp_use_dma_transfer(void)
 
 /**
  * ishtp_device() - Return device pointer
+ * @device: ISH-TP client device instance
  *
  * This interface is used to return device pointer from ishtp_cl_device
  * instance.
@@ -858,6 +853,7 @@ EXPORT_SYMBOL(ishtp_device);
  * ishtp_get_pci_device() - Return PCI device dev pointer
  * This interface is used to return PCI device pointer
  * from ishtp_cl_device instance.
+ * @device: ISH-TP client device instance
  *
  * Return: device *.
  */
@@ -869,19 +865,21 @@ EXPORT_SYMBOL(ishtp_get_pci_device);
 
 /**
  * ishtp_trace_callback() - Return trace callback
+ * @cl_device: ISH-TP client device instance
  *
  * This interface is used to return trace callback function pointer.
  *
- * Return: void *.
+ * Return: *ishtp_print_log()
  */
-void *ishtp_trace_callback(struct ishtp_cl_device *cl_device)
+ishtp_print_log ishtp_trace_callback(struct ishtp_cl_device *cl_device)
 {
 	return cl_device->ishtp_dev->print_log;
 }
 EXPORT_SYMBOL(ishtp_trace_callback);
 
 /**
  * ish_hw_reset() - Call HW reset IPC callback
+ * @dev:	ISHTP device instance
  *
  * This interface is used to reset HW in case of error.
  *