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* [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting
@ 2021-05-19  7:43 Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 1/5] usb: gadget: udc: core: Introduce check_config to verify USB configuration Wesley Cheng
                   ` (5 more replies)
  0 siblings, 6 replies; 9+ messages in thread
From: Wesley Cheng @ 2021-05-19  7:43 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp,
	Thinh.Nguyen, Wesley Cheng

Changes in V8:
 - Rebased to usb-testing
 - Using devm_kzalloc for adding txfifo property in dwc3-qcom
 - Removed DWC3 QCOM ACPI property for enabling the txfifo resize

Changes in V7:
 - Added a new property tx-fifo-max-num for limiting how much fifo space the
   resizing logic can allocate for endpoints with large burst values.  This
   can differ across platforms, and tie in closely with overall system latency.
 - Added recommended checks for DWC32.
 - Added changes to set the tx-fifo-resize property from dwc3-qcom by default
   instead of modifying the current DTSI files.
 - Added comments on all APIs/variables introduced.
 - Updated the DWC3 YAML to include a better description of the tx-fifo-resize
   property and added an entry for tx-fifo-max-num.

Changes in V6:
 - Rebased patches to usb-testing.
 - Renamed to PATCH series instead of RFC.
 - Checking for fs_descriptors instead of ss_descriptors for determining the
   endpoint count for a particular configuration.
 - Re-ordered patch series to fix patch dependencies.

Changes in V5:
 - Added check_config() logic, which is used to communicate the number of EPs
   used in a particular configuration.  Based on this, the DWC3 gadget driver
   has the ability to know the maximum number of eps utilized in all configs.
   This helps reduce unnecessary allocation to unused eps, and will catch fifo
   allocation issues at bind() time.
 - Fixed variable declaration to single line per variable, and reverse xmas.
 - Created a helper for fifo clearing, which is used by ep0.c

Changes in V4:
 - Removed struct dwc3* as an argument for dwc3_gadget_resize_tx_fifos()
 - Removed WARN_ON(1) in case we run out of fifo space
 
Changes in V3:
 - Removed "Reviewed-by" tags
 - Renamed series back to RFC
 - Modified logic to ensure that fifo_size is reset if we pass the minimum
   threshold.  Tested with binding multiple FDs requesting 6 FIFOs.

Changes in V2:
 - Modified TXFIFO resizing logic to ensure that each EP is reserved a
   FIFO.
 - Removed dev_dbg() prints and fixed typos from patches
 - Added some more description on the dt-bindings commit message

Currently, there is no functionality to allow for resizing the TXFIFOs, and
relying on the HW default setting for the TXFIFO depth.  In most cases, the
HW default is probably sufficient, but for USB compositions that contain
multiple functions that require EP bursting, the default settings
might not be enough.  Also to note, the current SW will assign an EP to a
function driver w/o checking to see if the TXFIFO size for that particular
EP is large enough. (this is a problem if there are multiple HW defined
values for the TXFIFO size)

It is mentioned in the SNPS databook that a minimum of TX FIFO depth = 3
is required for an EP that supports bursting.  Otherwise, there may be
frequent occurences of bursts ending.  For high bandwidth functions,
such as data tethering (protocols that support data aggregation), mass
storage, and media transfer protocol (over FFS), the bMaxBurst value can be
large, and a bigger TXFIFO depth may prove to be beneficial in terms of USB
throughput. (which can be associated to system access latency, etc...)  It
allows for a more consistent burst of traffic, w/o any interruptions, as
data is readily available in the FIFO.

With testing done using the mass storage function driver, the results show
that with a larger TXFIFO depth, the bandwidth increased significantly.

Test Parameters:
 - Platform: Qualcomm SM8150
 - bMaxBurst = 6
 - USB req size = 256kB
 - Num of USB reqs = 16
 - USB Speed = Super-Speed
 - Function Driver: Mass Storage (w/ ramdisk)
 - Test Application: CrystalDiskMark

Results:

TXFIFO Depth = 3 max packets

Test Case | Data Size | AVG tput (in MB/s)
-------------------------------------------
Sequential|1 GB x     | 
Read      |9 loops    | 193.60
	  |           | 195.86
          |           | 184.77
          |           | 193.60
-------------------------------------------

TXFIFO Depth = 6 max packets

Test Case | Data Size | AVG tput (in MB/s)
-------------------------------------------
Sequential|1 GB x     | 
Read      |9 loops    | 287.35
	  |           | 304.94
          |           | 289.64
          |           | 293.61
-------------------------------------------

Wesley Cheng (5):
  usb: gadget: udc: core: Introduce check_config to verify USB
    configuration
  usb: gadget: configfs: Check USB configuration before adding
  usb: dwc3: Resize TX FIFOs to meet EP bursting requirements
  usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default
  arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic

 arch/arm64/boot/dts/qcom/sm8150.dtsi |   1 +
 drivers/usb/dwc3/core.c              |   9 ++
 drivers/usb/dwc3/core.h              |  15 +++
 drivers/usb/dwc3/dwc3-qcom.c         |   9 ++
 drivers/usb/dwc3/ep0.c               |   2 +
 drivers/usb/dwc3/gadget.c            | 212 +++++++++++++++++++++++++++++++++++
 drivers/usb/gadget/configfs.c        |  22 ++++
 drivers/usb/gadget/udc/core.c        |  25 +++++
 include/linux/usb/gadget.h           |   5 +
 9 files changed, 300 insertions(+)

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v8 1/5] usb: gadget: udc: core: Introduce check_config to verify USB configuration
  2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
@ 2021-05-19  7:43 ` Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 2/5] usb: gadget: configfs: Check USB configuration before adding Wesley Cheng
                   ` (4 subsequent siblings)
  5 siblings, 0 replies; 9+ messages in thread
From: Wesley Cheng @ 2021-05-19  7:43 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp,
	Thinh.Nguyen, Wesley Cheng

Some UDCs may have constraints on how many high bandwidth endpoints it can
support in a certain configuration.  This API allows for the composite
driver to pass down the total number of endpoints to the UDC so it can verify
it has the required resources to support the configuration.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 drivers/usb/gadget/udc/core.c | 25 +++++++++++++++++++++++++
 include/linux/usb/gadget.h    |  5 +++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 493ff93..e67fd93 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1003,6 +1003,31 @@ int usb_gadget_ep_match_desc(struct usb_gadget *gadget,
 }
 EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc);
 
+/**
+ * usb_gadget_check_config - checks if the UDC can support the number of eps
+ * @gadget: controller to check the USB configuration
+ * @ep_map: bitmap of endpoints being requested by a USB configuration
+ *
+ * Ensure that a UDC is able to support the number of endpoints within a USB
+ * configuration, and that there are no resource limitations to support all
+ * requested eps.
+ *
+ * Returns zero on success, else a negative errno.
+ */
+int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map)
+{
+	int ret = 0;
+
+	if (!gadget->ops->check_config)
+		goto out;
+
+	ret = gadget->ops->check_config(gadget, ep_map);
+
+out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_check_config);
+
 /* ------------------------------------------------------------------------- */
 
 static void usb_gadget_state_work(struct work_struct *work)
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index ee04ef2..9fb69eb 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -328,6 +328,7 @@ struct usb_gadget_ops {
 	struct usb_ep *(*match_ep)(struct usb_gadget *,
 			struct usb_endpoint_descriptor *,
 			struct usb_ss_ep_comp_descriptor *);
+	int	(*check_config)(struct usb_gadget *gadget, unsigned long ep_map);
 };
 
 /**
@@ -607,6 +608,7 @@ int usb_gadget_connect(struct usb_gadget *gadget);
 int usb_gadget_disconnect(struct usb_gadget *gadget);
 int usb_gadget_deactivate(struct usb_gadget *gadget);
 int usb_gadget_activate(struct usb_gadget *gadget);
+int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map);
 #else
 static inline int usb_gadget_frame_number(struct usb_gadget *gadget)
 { return 0; }
@@ -630,6 +632,9 @@ static inline int usb_gadget_deactivate(struct usb_gadget *gadget)
 { return 0; }
 static inline int usb_gadget_activate(struct usb_gadget *gadget)
 { return 0; }
+static inline int usb_gadget_check_config(struct usb_gadget *gadget,
+					  unsigned long ep_map)
+{ return 0; }
 #endif /* CONFIG_USB_GADGET */
 
 /*-------------------------------------------------------------------------*/
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v8 2/5] usb: gadget: configfs: Check USB configuration before adding
  2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 1/5] usb: gadget: udc: core: Introduce check_config to verify USB configuration Wesley Cheng
@ 2021-05-19  7:43 ` Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 3/5] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements Wesley Cheng
                   ` (3 subsequent siblings)
  5 siblings, 0 replies; 9+ messages in thread
From: Wesley Cheng @ 2021-05-19  7:43 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp,
	Thinh.Nguyen, Wesley Cheng

Ensure that the USB gadget is able to support the configuration being
added based on the number of endpoints required from all interfaces.  This
is for accounting for any bandwidth or space limitations.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 drivers/usb/gadget/configfs.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 15a607c..76b9983 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -1374,6 +1374,7 @@ static int configfs_composite_bind(struct usb_gadget *gadget,
 		struct usb_function *f;
 		struct usb_function *tmp;
 		struct gadget_config_name *cn;
+		unsigned long ep_map = 0;
 
 		if (gadget_is_otg(gadget))
 			c->descriptors = otg_desc;
@@ -1403,7 +1404,28 @@ static int configfs_composite_bind(struct usb_gadget *gadget,
 				list_add(&f->list, &cfg->func_list);
 				goto err_purge_funcs;
 			}
+			if (f->fs_descriptors) {
+				struct usb_descriptor_header **d;
+
+				d = f->fs_descriptors;
+				for (; *d; ++d) {
+					struct usb_endpoint_descriptor *ep;
+					int addr;
+
+					if ((*d)->bDescriptorType != USB_DT_ENDPOINT)
+						continue;
+
+					ep = (struct usb_endpoint_descriptor *)*d;
+					addr = ((ep->bEndpointAddress & 0x80) >> 3) |
+						(ep->bEndpointAddress & 0x0f);
+					set_bit(addr, &ep_map);
+				}
+			}
 		}
+		ret = usb_gadget_check_config(cdev->gadget, ep_map);
+		if (ret)
+			goto err_purge_funcs;
+
 		usb_ep_autoconfig_reset(cdev->gadget);
 	}
 	if (cdev->use_os_string) {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v8 3/5] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements
  2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 1/5] usb: gadget: udc: core: Introduce check_config to verify USB configuration Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 2/5] usb: gadget: configfs: Check USB configuration before adding Wesley Cheng
@ 2021-05-19  7:43 ` Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default Wesley Cheng
                   ` (2 subsequent siblings)
  5 siblings, 0 replies; 9+ messages in thread
From: Wesley Cheng @ 2021-05-19  7:43 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp,
	Thinh.Nguyen, Wesley Cheng

Some devices have USB compositions which may require multiple endpoints
that support EP bursting.  HW defined TX FIFO sizes may not always be
sufficient for these compositions.  By utilizing flexible TX FIFO
allocation, this allows for endpoints to request the required FIFO depth to
achieve higher bandwidth.  With some higher bMaxBurst configurations, using
a larger TX FIFO size results in better TX throughput.

By introducing the check_config() callback, the resizing logic can fetch
the maximum number of endpoints used in the USB composition (can contain
multiple configurations), which helps ensure that the resizing logic can
fulfill the configuration(s), or return an error to the gadget layer
otherwise during bind time.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 drivers/usb/dwc3/core.c   |   9 ++
 drivers/usb/dwc3/core.h   |  15 ++++
 drivers/usb/dwc3/ep0.c    |   2 +
 drivers/usb/dwc3/gadget.c | 212 ++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 238 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index b6e53d8..74c0543 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1267,6 +1267,7 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	u8			rx_max_burst_prd;
 	u8			tx_thr_num_pkt_prd;
 	u8			tx_max_burst_prd;
+	u8			tx_fifo_resize_max_num;
 	const char		*usb_psy_name;
 	int			ret;
 
@@ -1282,6 +1283,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	 */
 	hird_threshold = 12;
 
+	tx_fifo_resize_max_num = 6;
+
 	dwc->maximum_speed = usb_get_maximum_speed(dev);
 	dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev);
 	dwc->dr_mode = usb_get_dr_mode(dev);
@@ -1325,6 +1328,10 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 				&tx_thr_num_pkt_prd);
 	device_property_read_u8(dev, "snps,tx-max-burst-prd",
 				&tx_max_burst_prd);
+	dwc->do_fifo_resize = device_property_read_bool(dev,
+							"tx-fifo-resize");
+	device_property_read_u8(dev, "tx-fifo-max-num",
+				&tx_fifo_resize_max_num);
 
 	dwc->disable_scramble_quirk = device_property_read_bool(dev,
 				"snps,disable_scramble_quirk");
@@ -1390,6 +1397,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	dwc->tx_max_burst_prd = tx_max_burst_prd;
 
 	dwc->imod_interval = 0;
+
+	dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num;
 }
 
 /* check whether the core supports IMOD */
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index b1e875c..84d4682 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1023,6 +1023,7 @@ struct dwc3_scratchpad_array {
  * @rx_max_burst_prd: max periodic ESS receive burst size
  * @tx_thr_num_pkt_prd: periodic ESS transmit packet count
  * @tx_max_burst_prd: max periodic ESS transmit burst size
+ * @tx_fifo_resize_max_num: max number of fifos allocated during txfifo resize
  * @hsphy_interface: "utmi" or "ulpi"
  * @connected: true when we're connected to a host, false otherwise
  * @delayed_status: true when gadget driver asks for delayed status
@@ -1079,6 +1080,11 @@ struct dwc3_scratchpad_array {
  * @dis_split_quirk: set to disable split boundary.
  * @imod_interval: set the interrupt moderation interval in 250ns
  *			increments or 0 to disable.
+ * @max_cfg_eps: current max number of IN eps used across all USB configs.
+ * @last_fifo_depth: last fifo depth used to determine next fifo ram start
+ *		     address.
+ * @num_ep_resized: carries the current number endpoints which have had its tx
+ *		    fifo resized.
  */
 struct dwc3 {
 	struct work_struct	drd_work;
@@ -1234,6 +1240,7 @@ struct dwc3 {
 	u8			rx_max_burst_prd;
 	u8			tx_thr_num_pkt_prd;
 	u8			tx_max_burst_prd;
+	u8			tx_fifo_resize_max_num;
 
 	const char		*hsphy_interface;
 
@@ -1247,6 +1254,7 @@ struct dwc3 {
 	unsigned		is_utmi_l1_suspend:1;
 	unsigned		is_fpga:1;
 	unsigned		pending_events:1;
+	unsigned		do_fifo_resize:1;
 	unsigned		pullups_connected:1;
 	unsigned		setup_packet_pending:1;
 	unsigned		three_stage_setup:1;
@@ -1282,6 +1290,10 @@ struct dwc3 {
 	unsigned		dis_split_quirk:1;
 
 	u16			imod_interval;
+
+	int			max_cfg_eps;
+	int			last_fifo_depth;
+	int			num_ep_resized;
 };
 
 #define INCRX_BURST_MODE 0
@@ -1513,6 +1525,7 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
 		struct dwc3_gadget_ep_cmd_params *params);
 int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned int cmd,
 		u32 param);
+void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc);
 #else
 static inline int dwc3_gadget_init(struct dwc3 *dwc)
 { return 0; }
@@ -1532,6 +1545,8 @@ static inline int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd,
 static inline int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
 		int cmd, u32 param)
 { return 0; }
+static inline void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc)
+{ }
 #endif
 
 #if IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 8b668ef..4f216bd 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -616,6 +616,8 @@ static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl)
 		return -EINVAL;
 
 	case USB_STATE_ADDRESS:
+		dwc3_gadget_clear_tx_fifos(dwc);
+
 		ret = dwc3_ep0_delegate_req(dwc, ctrl);
 		/* if the cfg matches and the cfg is non zero */
 		if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index dd80e5c..e2f4dad 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -632,6 +632,179 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 		bool interrupt);
 
 /**
+ * dwc3_gadget_calc_tx_fifo_size - calculates the txfifo size value
+ * @dwc: pointer to the DWC3 context
+ * @nfifos: number of fifos to calculate for
+ *
+ * Calculates the size value based on the equation below:
+ *
+ * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
+ *
+ * The max packet size is set to 1024, as the txfifo requirements mainly apply
+ * to super speed USB use cases.  However, it is safe to overestimate the fifo
+ * allocations for other scenarios, i.e. high speed USB.
+ */
+static int dwc3_gadget_calc_tx_fifo_size(struct dwc3 *dwc, int mult)
+{
+	int max_packet = 1024;
+	int fifo_size;
+	int mdwidth;
+
+	mdwidth = dwc3_mdwidth(dwc->hwparams.hwparams0);
+
+	/* MDWIDTH is represented in bits, we need it in bytes */
+	mdwidth >>= 3;
+
+	fifo_size = mult * ((max_packet + mdwidth) / mdwidth) + 1;
+	return fifo_size;
+}
+
+/**
+ * dwc3_gadget_clear_tx_fifo_size - Clears txfifo allocation
+ * @dwc: pointer to the DWC3 context
+ *
+ * Iterates through all the endpoint registers and clears the previous txfifo
+ * allocations.
+ */
+void dwc3_gadget_clear_tx_fifos(struct dwc3 *dwc)
+{
+	struct dwc3_ep *dep;
+	int fifo_depth;
+	int size;
+	int num;
+
+	if (!dwc->do_fifo_resize)
+		return;
+
+	/* Read ep0IN related TXFIFO size */
+	dep = dwc->eps[1];
+	size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
+	if (DWC3_IP_IS(DWC3))
+		fifo_depth = DWC3_GTXFIFOSIZ_TXFDEP(size);
+	else
+		fifo_depth = DWC31_GTXFIFOSIZ_TXFDEP(size);
+
+	dwc->last_fifo_depth = fifo_depth;
+	/* Clear existing TXFIFO for all IN eps except ep0 */
+	for (num = 3; num < min_t(int, dwc->num_eps, DWC3_ENDPOINTS_NUM);
+	     num += 2) {
+		dep = dwc->eps[num];
+		/* Don't change TXFRAMNUM on usb31 version */
+		size = DWC3_IP_IS(DWC3) ? 0 :
+			dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1)) &
+				   DWC31_GTXFIFOSIZ_TXFRAMNUM;
+
+		dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num >> 1), size);
+	}
+	dwc->num_ep_resized = 0;
+}
+
+/*
+ * dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
+ * @dwc: pointer to our context structure
+ *
+ * This function will a best effort FIFO allocation in order
+ * to improve FIFO usage and throughput, while still allowing
+ * us to enable as many endpoints as possible.
+ *
+ * Keep in mind that this operation will be highly dependent
+ * on the configured size for RAM1 - which contains TxFifo -,
+ * the amount of endpoints enabled on coreConsultant tool, and
+ * the width of the Master Bus.
+ *
+ * In general, FIFO depths are represented with the following equation:
+ *
+ * fifo_size = mult * ((max_packet + mdwidth)/mdwidth + 1) + 1
+ *
+ * Conversions can be done to the equation to derive the number of packets that
+ * will fit to a particular FIFO size value.
+ */
+static int dwc3_gadget_resize_tx_fifos(struct dwc3_ep *dep)
+{
+	struct dwc3 *dwc = dep->dwc;
+	int fifo_0_start;
+	int ram1_depth;
+	int fifo_size;
+	int min_depth;
+	int num_in_ep;
+	int remaining;
+	int num_fifos = 1;
+	int fifo;
+	int tmp;
+
+	if (!dwc->do_fifo_resize)
+		return 0;
+
+	/* resize IN endpoints except ep0 */
+	if (!usb_endpoint_dir_in(dep->endpoint.desc) || dep->number <= 1)
+		return 0;
+
+	ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
+
+	if ((dep->endpoint.maxburst > 1 &&
+	     usb_endpoint_xfer_bulk(dep->endpoint.desc)) ||
+	    usb_endpoint_xfer_isoc(dep->endpoint.desc))
+		num_fifos = 3;
+
+	if (dep->endpoint.maxburst > 6 &&
+	    usb_endpoint_xfer_bulk(dep->endpoint.desc) && DWC3_IP_IS(DWC31))
+		num_fifos = dwc->tx_fifo_resize_max_num;
+
+	/* FIFO size for a single buffer */
+	fifo = dwc3_gadget_calc_tx_fifo_size(dwc, 1);
+
+	/* Calculate the number of remaining EPs w/o any FIFO */
+	num_in_ep = dwc->max_cfg_eps;
+	num_in_ep -= dwc->num_ep_resized;
+
+	/* Reserve at least one FIFO for the number of IN EPs */
+	min_depth = num_in_ep * (fifo + 1);
+	remaining = ram1_depth - min_depth - dwc->last_fifo_depth;
+	remaining = max_t(int, 0, remaining);
+	/*
+	 * We've already reserved 1 FIFO per EP, so check what we can fit in
+	 * addition to it.  If there is not enough remaining space, allocate
+	 * all the remaining space to the EP.
+	 */
+	fifo_size = (num_fifos - 1) * fifo;
+	if (remaining < fifo_size)
+		fifo_size = remaining;
+
+	fifo_size += fifo;
+	/* Last increment according to the TX FIFO size equation */
+	fifo_size++;
+
+	/* Check if TXFIFOs start at non-zero addr */
+	tmp = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(0));
+	fifo_0_start = DWC3_GTXFIFOSIZ_TXFSTADDR(tmp);
+
+	fifo_size |= (fifo_0_start + (dwc->last_fifo_depth << 16));
+	if (DWC3_IP_IS(DWC3))
+		dwc->last_fifo_depth += DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
+	else
+		dwc->last_fifo_depth += DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
+
+	/* Check fifo size allocation doesn't exceed available RAM size. */
+	if (dwc->last_fifo_depth >= ram1_depth) {
+		dev_err(dwc->dev, "Fifosize(%d) > RAM size(%d) %s depth:%d\n",
+			dwc->last_fifo_depth, ram1_depth,
+			dep->endpoint.name, fifo_size);
+		if (DWC3_IP_IS(DWC3))
+			fifo_size = DWC3_GTXFIFOSIZ_TXFDEP(fifo_size);
+		else
+			fifo_size = DWC31_GTXFIFOSIZ_TXFDEP(fifo_size);
+
+		dwc->last_fifo_depth -= fifo_size;
+		return -ENOMEM;
+	}
+
+	dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1), fifo_size);
+	dwc->num_ep_resized++;
+
+	return 0;
+}
+
+/**
  * __dwc3_gadget_ep_enable - initializes a hw endpoint
  * @dep: endpoint to be initialized
  * @action: one of INIT, MODIFY or RESTORE
@@ -648,6 +821,10 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
 	int			ret;
 
 	if (!(dep->flags & DWC3_EP_ENABLED)) {
+		ret = dwc3_gadget_resize_tx_fifos(dep);
+		if (ret)
+			return ret;
+
 		ret = dwc3_gadget_start_config(dep);
 		if (ret)
 			return ret;
@@ -2492,6 +2669,7 @@ static int dwc3_gadget_stop(struct usb_gadget *g)
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	dwc->gadget_driver	= NULL;
+	dwc->max_cfg_eps = 0;
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	free_irq(dwc->irq_gadget, dwc->ev_buf);
@@ -2579,6 +2757,39 @@ static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
 	return ret;
 }
 
+static int dwc3_gadget_check_config(struct usb_gadget *g, unsigned long ep_map)
+{
+	struct dwc3 *dwc = gadget_to_dwc(g);
+	unsigned long in_ep_map;
+	int fifo_size = 0;
+	int ram1_depth;
+	int ep_num;
+
+	if (!dwc->do_fifo_resize)
+		return 0;
+
+	/* Only interested in the IN endpoints */
+	in_ep_map = ep_map >> 16;
+	ep_num = hweight_long(in_ep_map);
+
+	if (ep_num <= dwc->max_cfg_eps)
+		return 0;
+
+	/* Update the max number of eps in the composition */
+	dwc->max_cfg_eps = ep_num;
+
+	fifo_size = dwc3_gadget_calc_tx_fifo_size(dwc, dwc->max_cfg_eps);
+	/* Based on the equation, increment by one for every ep */
+	fifo_size += dwc->max_cfg_eps;
+
+	/* Check if we can fit a single fifo per endpoint */
+	ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
+	if (fifo_size > ram1_depth)
+		return -ENOMEM;
+
+	return 0;
+}
+
 static const struct usb_gadget_ops dwc3_gadget_ops = {
 	.get_frame		= dwc3_gadget_get_frame,
 	.wakeup			= dwc3_gadget_wakeup,
@@ -2590,6 +2801,7 @@ static const struct usb_gadget_ops dwc3_gadget_ops = {
 	.udc_set_ssp_rate	= dwc3_gadget_set_ssp_rate,
 	.get_config_params	= dwc3_gadget_config_params,
 	.vbus_draw		= dwc3_gadget_vbus_draw,
+	.check_config		= dwc3_gadget_check_config,
 };
 
 /* -------------------------------------------------------------------------- */
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v8 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default
  2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
                   ` (2 preceding siblings ...)
  2021-05-19  7:43 ` [PATCH v8 3/5] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements Wesley Cheng
@ 2021-05-19  7:43 ` Wesley Cheng
  2021-05-19  7:43 ` [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic Wesley Cheng
  2021-05-29  0:40 ` [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
  5 siblings, 0 replies; 9+ messages in thread
From: Wesley Cheng @ 2021-05-19  7:43 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp,
	Thinh.Nguyen, Wesley Cheng

In order to take advantage of the TX fifo resizing logic, manually add
these properties to the DWC3 child node by default.  This will allow
the DWC3 gadget to resize the TX fifos for the IN endpoints, which
help with performance.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 49e6ca9..44e0eaa1 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -645,6 +645,7 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 	struct dwc3_qcom	*qcom = platform_get_drvdata(pdev);
 	struct device_node	*np = pdev->dev.of_node, *dwc3_np;
 	struct device		*dev = &pdev->dev;
+	struct property		*prop;
 	int			ret;
 
 	dwc3_np = of_get_compatible_child(np, "snps,dwc3");
@@ -653,6 +654,14 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
+	if (prop) {
+		prop->name = "tx-fifo-resize";
+		ret = of_add_property(dwc3_np, prop);
+		if (ret < 0)
+			dev_info(dev, "unable to add tx-fifo-resize prop\n");
+	}
+
 	ret = of_platform_populate(np, NULL, NULL, dev);
 	if (ret) {
 		dev_err(dev, "failed to register dwc3 core - %d\n", ret);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic
  2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
                   ` (3 preceding siblings ...)
  2021-05-19  7:43 ` [PATCH v8 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default Wesley Cheng
@ 2021-05-19  7:43 ` Wesley Cheng
  2021-05-29 17:07   ` Bjorn Andersson
  2021-05-29  0:40 ` [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
  5 siblings, 1 reply; 9+ messages in thread
From: Wesley Cheng @ 2021-05-19  7:43 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp,
	Thinh.Nguyen, Wesley Cheng

Enable the flexible TX FIFO resize logic on SM8150.  Using a larger TX FIFO
SZ can help account for situations when system latency is greater than the
USB bus transmission latency.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 arch/arm64/boot/dts/qcom/sm8150.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
index 51235a9..8f532cb 100644
--- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
@@ -2275,6 +2275,7 @@
 				iommus = <&apps_smmu 0x140 0>;
 				snps,dis_u2_susphy_quirk;
 				snps,dis_enblslpm_quirk;
+				tx-fifo-resize;
 				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
 				phy-names = "usb2-phy", "usb3-phy";
 			};
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting
  2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
                   ` (4 preceding siblings ...)
  2021-05-19  7:43 ` [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic Wesley Cheng
@ 2021-05-29  0:40 ` Wesley Cheng
  5 siblings, 0 replies; 9+ messages in thread
From: Wesley Cheng @ 2021-05-29  0:40 UTC (permalink / raw)
  To: balbi, gregkh, agross, bjorn.andersson, robh+dt
  Cc: linux-usb, linux-kernel, linux-arm-msm, devicetree, jackp, Thinh.Nguyen

Hi Felipe,

Sorry for the ping, but was just wondering if you had any feedback on
the latest txfifo resize patch series?  I think I addressed the concerns
you had about making sure we had enough FIFO size for a composition
before allowing the configuration to bind with the check_config() API.
It would ensure at least enough room for 1 max packet size for each EP
in a configuration before allowing the bind to complete.

That way we'd avoid being enumerated w/ the host, and having
non-functioning endpoints.  We've been testing these changes internally,
and they are providing a pretty significant boost to our USB throughput
numbers.

Thanks
Wesley Cheng

On 5/19/2021 12:43 AM, Wesley Cheng wrote:
> Changes in V8:
>  - Rebased to usb-testing
>  - Using devm_kzalloc for adding txfifo property in dwc3-qcom
>  - Removed DWC3 QCOM ACPI property for enabling the txfifo resize
> 
> Changes in V7:
>  - Added a new property tx-fifo-max-num for limiting how much fifo space the
>    resizing logic can allocate for endpoints with large burst values.  This
>    can differ across platforms, and tie in closely with overall system latency.
>  - Added recommended checks for DWC32.
>  - Added changes to set the tx-fifo-resize property from dwc3-qcom by default
>    instead of modifying the current DTSI files.
>  - Added comments on all APIs/variables introduced.
>  - Updated the DWC3 YAML to include a better description of the tx-fifo-resize
>    property and added an entry for tx-fifo-max-num.
> 
> Changes in V6:
>  - Rebased patches to usb-testing.
>  - Renamed to PATCH series instead of RFC.
>  - Checking for fs_descriptors instead of ss_descriptors for determining the
>    endpoint count for a particular configuration.
>  - Re-ordered patch series to fix patch dependencies.
> 
> Changes in V5:
>  - Added check_config() logic, which is used to communicate the number of EPs
>    used in a particular configuration.  Based on this, the DWC3 gadget driver
>    has the ability to know the maximum number of eps utilized in all configs.
>    This helps reduce unnecessary allocation to unused eps, and will catch fifo
>    allocation issues at bind() time.
>  - Fixed variable declaration to single line per variable, and reverse xmas.
>  - Created a helper for fifo clearing, which is used by ep0.c
> 
> Changes in V4:
>  - Removed struct dwc3* as an argument for dwc3_gadget_resize_tx_fifos()
>  - Removed WARN_ON(1) in case we run out of fifo space
>  
> Changes in V3:
>  - Removed "Reviewed-by" tags
>  - Renamed series back to RFC
>  - Modified logic to ensure that fifo_size is reset if we pass the minimum
>    threshold.  Tested with binding multiple FDs requesting 6 FIFOs.
> 
> Changes in V2:
>  - Modified TXFIFO resizing logic to ensure that each EP is reserved a
>    FIFO.
>  - Removed dev_dbg() prints and fixed typos from patches
>  - Added some more description on the dt-bindings commit message
> 
> Currently, there is no functionality to allow for resizing the TXFIFOs, and
> relying on the HW default setting for the TXFIFO depth.  In most cases, the
> HW default is probably sufficient, but for USB compositions that contain
> multiple functions that require EP bursting, the default settings
> might not be enough.  Also to note, the current SW will assign an EP to a
> function driver w/o checking to see if the TXFIFO size for that particular
> EP is large enough. (this is a problem if there are multiple HW defined
> values for the TXFIFO size)
> 
> It is mentioned in the SNPS databook that a minimum of TX FIFO depth = 3
> is required for an EP that supports bursting.  Otherwise, there may be
> frequent occurences of bursts ending.  For high bandwidth functions,
> such as data tethering (protocols that support data aggregation), mass
> storage, and media transfer protocol (over FFS), the bMaxBurst value can be
> large, and a bigger TXFIFO depth may prove to be beneficial in terms of USB
> throughput. (which can be associated to system access latency, etc...)  It
> allows for a more consistent burst of traffic, w/o any interruptions, as
> data is readily available in the FIFO.
> 
> With testing done using the mass storage function driver, the results show
> that with a larger TXFIFO depth, the bandwidth increased significantly.
> 
> Test Parameters:
>  - Platform: Qualcomm SM8150
>  - bMaxBurst = 6
>  - USB req size = 256kB
>  - Num of USB reqs = 16
>  - USB Speed = Super-Speed
>  - Function Driver: Mass Storage (w/ ramdisk)
>  - Test Application: CrystalDiskMark
> 
> Results:
> 
> TXFIFO Depth = 3 max packets
> 
> Test Case | Data Size | AVG tput (in MB/s)
> -------------------------------------------
> Sequential|1 GB x     | 
> Read      |9 loops    | 193.60
> 	  |           | 195.86
>           |           | 184.77
>           |           | 193.60
> -------------------------------------------
> 
> TXFIFO Depth = 6 max packets
> 
> Test Case | Data Size | AVG tput (in MB/s)
> -------------------------------------------
> Sequential|1 GB x     | 
> Read      |9 loops    | 287.35
> 	  |           | 304.94
>           |           | 289.64
>           |           | 293.61
> -------------------------------------------
> 
> Wesley Cheng (5):
>   usb: gadget: udc: core: Introduce check_config to verify USB
>     configuration
>   usb: gadget: configfs: Check USB configuration before adding
>   usb: dwc3: Resize TX FIFOs to meet EP bursting requirements
>   usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default
>   arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic
> 
>  arch/arm64/boot/dts/qcom/sm8150.dtsi |   1 +
>  drivers/usb/dwc3/core.c              |   9 ++
>  drivers/usb/dwc3/core.h              |  15 +++
>  drivers/usb/dwc3/dwc3-qcom.c         |   9 ++
>  drivers/usb/dwc3/ep0.c               |   2 +
>  drivers/usb/dwc3/gadget.c            | 212 +++++++++++++++++++++++++++++++++++
>  drivers/usb/gadget/configfs.c        |  22 ++++
>  drivers/usb/gadget/udc/core.c        |  25 +++++
>  include/linux/usb/gadget.h           |   5 +
>  9 files changed, 300 insertions(+)
> 

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic
  2021-05-19  7:43 ` [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic Wesley Cheng
@ 2021-05-29 17:07   ` Bjorn Andersson
  2021-05-29 19:24     ` Jack Pham
  0 siblings, 1 reply; 9+ messages in thread
From: Bjorn Andersson @ 2021-05-29 17:07 UTC (permalink / raw)
  To: Wesley Cheng
  Cc: balbi, gregkh, agross, robh+dt, linux-usb, linux-kernel,
	linux-arm-msm, devicetree, jackp, Thinh.Nguyen

On Wed 19 May 02:43 CDT 2021, Wesley Cheng wrote:

> Enable the flexible TX FIFO resize logic on SM8150.  Using a larger TX FIFO
> SZ can help account for situations when system latency is greater than the
> USB bus transmission latency.
> 
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>

Based on my previous request of always adding this for the Qualcomm
platforms that supports it, which is implemented in patch 4, I don't see
a need for this patch.

Am I missing something?

Regards,
Bjorn

> ---
>  arch/arm64/boot/dts/qcom/sm8150.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> index 51235a9..8f532cb 100644
> --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> @@ -2275,6 +2275,7 @@
>  				iommus = <&apps_smmu 0x140 0>;
>  				snps,dis_u2_susphy_quirk;
>  				snps,dis_enblslpm_quirk;
> +				tx-fifo-resize;
>  				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
>  				phy-names = "usb2-phy", "usb3-phy";
>  			};
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic
  2021-05-29 17:07   ` Bjorn Andersson
@ 2021-05-29 19:24     ` Jack Pham
  0 siblings, 0 replies; 9+ messages in thread
From: Jack Pham @ 2021-05-29 19:24 UTC (permalink / raw)
  To: Bjorn Andersson
  Cc: Wesley Cheng, balbi, gregkh, agross, robh+dt, linux-usb,
	linux-kernel, linux-arm-msm, devicetree, Thinh.Nguyen

Hi Bjorn,

On Sat, May 29, 2021 at 12:07:31PM -0500, Bjorn Andersson wrote:
> On Wed 19 May 02:43 CDT 2021, Wesley Cheng wrote:
> 
> > Enable the flexible TX FIFO resize logic on SM8150.  Using a larger TX FIFO
> > SZ can help account for situations when system latency is greater than the
> > USB bus transmission latency.
> > 
> > Reviewed-by: Rob Herring <robh@kernel.org>
> > Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
> 
> Based on my previous request of always adding this for the Qualcomm
> platforms that supports it, which is implemented in patch 4, I don't see
> a need for this patch.
> 
> Am I missing something?

Looks like Wesley had quickly sent a V9 of the series right after V8,
and the DTSI change is dropped.

https://lore.kernel.org/linux-usb/1621410561-32762-1-git-send-email-wcheng@codeaurora.org/T/#t

Thanks,
Jack

> > ---
> >  arch/arm64/boot/dts/qcom/sm8150.dtsi | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > index 51235a9..8f532cb 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> > @@ -2275,6 +2275,7 @@
> >  				iommus = <&apps_smmu 0x140 0>;
> >  				snps,dis_u2_susphy_quirk;
> >  				snps,dis_enblslpm_quirk;
> > +				tx-fifo-resize;
> >  				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
> >  				phy-names = "usb2-phy", "usb3-phy";
> >  			};

-- 
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2021-05-29 19:24 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-19  7:43 [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
2021-05-19  7:43 ` [PATCH v8 1/5] usb: gadget: udc: core: Introduce check_config to verify USB configuration Wesley Cheng
2021-05-19  7:43 ` [PATCH v8 2/5] usb: gadget: configfs: Check USB configuration before adding Wesley Cheng
2021-05-19  7:43 ` [PATCH v8 3/5] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements Wesley Cheng
2021-05-19  7:43 ` [PATCH v8 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default Wesley Cheng
2021-05-19  7:43 ` [PATCH v8 5/5] arm64: boot: dts: qcom: sm8150: Enable dynamic TX FIFO resize logic Wesley Cheng
2021-05-29 17:07   ` Bjorn Andersson
2021-05-29 19:24     ` Jack Pham
2021-05-29  0:40 ` [PATCH v8 0/5] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng

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