[PATCH v2 00/10] USB: chipidea misc patches

[PATCH v2 00/10] USB: chipidea misc patches

[Peter Chen]

Hi all,

In this series, I add several new interfaces for chipidea driver,
they are mainly for system configuration adjustment. The USB
performance may be improved with these configuration changing,
but each vendor driver owner needs to consult with your IC
owner which configuration parameters are suitable for your system
before changing it, and only change it if necessary.

The other changes are for imx, it shows how imx uses these interfaces.
Shawn, the patch [5/10] and [9/10] are dts changes, help to review it
please.

Changes for v2:
- Use the bit fields which are not used. [Patch 2/10, 6/10, 10/10]
- According to Greg and Sascha comments, format patch 2/10's
  commit log.
- using non-burst instead of unburst for patch 7/10

Peter Chen (10):
  usb: chipidea: udc: zero-length packet is only needed for TX
  usb: chipidea: define stream mode disable for both roles
  usb: chipidea: imx: add stream mode enable for device mode at
    imx6sl/imx6sx
  Doc: usb: ci-hdrc-usb2: add ahb-burst-config for binding doc
  ARM: imx6: set ahb-burst-config as 0 for USB
  usb: chipidea: add ahb burst configuration interface
  usb: chipidea: usbmisc_imx: add non-burst setting for imx6
  Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc
  ARM: imx6: change default burst size for USB
  usb: chipidea: add tx/rx burst size configuration interface

 .../devicetree/bindings/usb/ci-hdrc-usb2.txt       | 10 ++++
 arch/arm/boot/dts/imx6qdl.dtsi                     | 12 +++++
 arch/arm/boot/dts/imx6sl.dtsi                      |  9 ++++
 arch/arm/boot/dts/imx6sx.dtsi                      |  9 ++++
 drivers/usb/chipidea/bits.h                        |  7 +++
 drivers/usb/chipidea/ci.h                          |  1 +
 drivers/usb/chipidea/ci_hdrc_imx.c                 | 16 +++---
 drivers/usb/chipidea/core.c                        | 62 +++++++++++++++++++++-
 drivers/usb/chipidea/udc.c                         |  2 +-
 drivers/usb/chipidea/usbmisc_imx.c                 | 12 ++++-
 include/linux/usb/chipidea.h                       | 11 +++-
 11 files changed, 140 insertions(+), 11 deletions(-)

-- 
1.9.1

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[PATCH v2 01/10] usb: chipidea: udc: zero-length packet is only needed for TX

[Peter Chen]

The zero-length packet is the sendor tells the receiver that there
is no more data, so it is only needed at the TX side.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/chipidea/udc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 06b7224..51e66a1 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -445,7 +445,7 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 		rest -= count;
 	}
 
-	if (hwreq->req.zero && hwreq->req.length
+	if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
 	    && (hwreq->req.length % hwep->ep.maxpacket == 0))
 		add_td_to_list(hwep, hwreq, 0);
 
-- 
1.9.1

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[PATCH v2 02/10] usb: chipidea: define stream mode disable for both roles

[Peter Chen]

The system bus and chipidea IP have different limitations for
both host and device mode.
For example, with below errata, we need to enable SDIS(Stream Disable
Mode) at host mode. But we don't want it for device mode at the
same system.

TAR 9000378958
Title: Non-Double Word Aligned Buffer Address Sometimes Causes Host to
Hang on OUT Retry
Impacted Configuration: Host mode, all transfer types
Description:
The host core operating in streaming mode may under run while sending
the data packet of an OUT transaction. This under run can occur if
there are unexpected system delays in fetching the remaining packet
data from memory. The host forces a bad CRC on the packet, the device
detects the error and discards the packet. The host then retries a Bulk,
Interrupt, or Control transfer if an under run occurs according to the
USB specification. During simulations, it was found that the host does
not issue the retry of the failed bulk OUT. It does not issue any other
transactions except SOF packets that have incorrect frame numbers.

The second failure mode occurs if the under run occurs on an ISO OUT
transaction and the next ISO transaction is a zero byte packet. The host
does not issue any transactions (including SOFs). The device detects a
Suspend condition, reverts to full speed, and waits for resume signaling.

A third failure mode occurs when the host under runs on an ISO OUT and
the next ISO in the schedule is an ISO OUT with two max packets of 1024
bytes each. The host should issue MDATA for the first OUT followed by
DATA1 for the second. However, it drops the MDATA transaction, and
issues the DATA1 transaction.

The system impact of this bug is the same regardless of the failure mode
observed. The host core hangs, the ehci_ctrl state machine waits for the
protocol engine to send the completion status for the corrupted
transaction, which never occurs. No indication is sent to the host
controller driver, no register bits change and no interrupts occur.
Eventually the requesting application times out.

Detailed internal behavior:
The EHCI control state machine (ehci_ctrl) in the DMA block is responsible
for parsing the schedules and initiating all transactions. The ehci_ctrl
state machine passes the transaction details to the protocol block by
writing the transaction information in to the TxFIFO. It then asserts
the pe_hst_run_pkt signal to inform the host protocol state machine
(pe_hst_state) that there is a packet in the TxFIFO.
A tag of 0x0 indicates a start of packet with the data providing the
following information:

35:32 Tag
31:30 Reserved
29:23 Endpoint (lowest 4 bits)
22:16 Address
15:10 Reserved
9:8 Endpoint speed
7:6 Endpoint type
5:6 Data Toggle
3:0 PID
The pe_hst_state reads the packet information and constructs the packet
and issues it to the PHY interface.
The ehci_ctrl state machine writes the start transaction information in
to the TxFIFO as 0x03002910c for the OUT packet that had the under run
error. However, it writes 0xC3002910C for the retry of the Out
transaction, which is incorrect.
The pe_hst_state enters a bus timeout state after sending the bad CRC
for the packet that under ran. It then purges any data that was back
filled in to the TxFIFO for the packet that under ran. The pe_hst_state
machine stops purging the TxFIFO when it is empty or if it reads a
location that has a tag of 0x0, indicating a start of packet command.

The pe_hst_state reads 0xC3002910C and discards it as it does not decode
to a start of packet command. It continues to purge the OUT data that
has been pre-buffered for the OUT retry . The pe_hst_state detects the
hst_packet_run signal and attempts to read the PID and address
information from the TxFIFO. This location has packet data and so does
not decode to a valid PID and so falls through to the PE_HST_SOF_LOAD
state where the frame_num_counter is updated. The frame_num_counter
is updated with the data in the TxFIFO. In this case, the data is
incorrect as the ehci_ctrl state machine did not initiate the load.
The hst_pe_state machine detects the SOF request signal and sends an
SOF with the bad frame number. Meanwhile, the ehci_ctrl state machine
waits indefinitely in the run_pkt state waiting for the completion
status from pe_hst_state machine, which will never happen.

The ISO failure case is similar except that there is no retry for ISO.
The ehci_ctrl state machine moves to the next transfer in the periodic
schedule. If the under run occurs on the last entry of the periodic
list then it moves to the Async schedule.

In the case of ISO OUT simulations, the next ISO is a zero byte OUT
and again the start of packet command gets corrupted. The TxFIFO is
empty when the hst_pe_state attempts to read the Address and PID
information as the transaction is a zero byte packet. This results
in the hst_pe_state machine staying in the GET_PID state, which means
that it does not issue any transactions (including SOFs). The device
detects a Suspend condition and reverts to full speed mode and waits
for a Resume or Reset signal.

The EHCI specification allows a Non-DoubleWord (32 bits) offset to
be used as a current offset for Buffer Pointer Page 0 of the qTD.
In Non-DoubleWord aligned cases, the core reads the packet data
from the AHB memory, performs the alignment operation before writing
it in to the TxFIFO as a 32 bit data word. An End Of Packet tag (EOP)
is written to the TxFIFO after all the packet data has been written
in to the TxFIFO. The alignment function is reset to Idle by the EOP
tag. The corruption of the start of packet command arises because the
packet buffer for the OUT transaction that under ran is not aligned
to a DoubleWord, and hence no EOP tag is written to the TxFIFO. The
alignment function is still active when the start packet information
is written in to the TxFIFO for the retry of the bulk packet or for
the next transaction in the case of an under run on an ISO. This
results in the corruption of the start tag and the transaction
information.

Click for waveform showing the command 0x 0000300291 being written in
to the TX FIFO for the Out that under ran.
Click for waveform showing the command 0xC3002910C written to the
TxFIFO instead of 0x 0000300291
Versions affected: Versions 2.10a and previous versions
How discovered: Customer simulation

Workaround:
1- The EHCI specification allows a non-DoubleWord offset to be used
as a current offset for Buffer Pointer Page 0 of the qTD. However,
if a DoubleWord offset is used then this issue does not arise.
2- Use non streaming mode to eliminate under runs.

Resolution:
The fix involves changes to the traffic state machine in the
vusb_hs_dma_traf block. The ehci_ctrl state machine updates the context
information by encoding the transaction results on the
hst_op_context_update signals at the end of a transaction. The signal
hst_op_context_update is added to the traffic state machine, and the
tx_fifo_under_ran_r signal is generated if the transaction results in
an under run error. Click for waveform

The traffic state machine then traverses to the do_eop states if the
tx_fifo_under_ran error is asserted. Thus an EOP tag is written in to
the TxFIFO as shown in this waveform .

The EOP tag resets the align state machine to the Idle state ensuring
that the next command written by the echi_ctrl state machine does not
get corrupted.

File(s) modified:
RTL code fixed: …..
Method of reproducing: This failure cannot be reproduced in the current
test bench.
Date Found: March 2010
Date Fixed: June 2010
Update information:
Added the RTL code fix

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/chipidea/core.c  | 13 ++++++++++++-
 include/linux/usb/chipidea.h |  5 ++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 9cbb846..38bd036 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -64,6 +64,7 @@
 #include <linux/of.h>
 #include <linux/phy.h>
 #include <linux/regulator/consumer.h>
+#include <linux/usb/ehci_def.h>
 
 #include "ci.h"
 #include "udc.h"
@@ -413,7 +414,17 @@ static int ci_usb_phy_init(struct ci_hdrc *ci)
  */
 void ci_platform_configure(struct ci_hdrc *ci)
 {
-	if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
+	bool is_device_mode, is_host_mode;
+
+	is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
+	is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
+
+	if (is_device_mode &&
+		(ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING))
+		hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
+
+	if (is_host_mode &&
+		(ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING))
 		hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
 
 	if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index aa49177..034f7e1 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -19,8 +19,11 @@ struct ci_hdrc_platform_data {
 	enum usb_phy_interface phy_mode;
 	unsigned long	 flags;
 #define CI_HDRC_REGS_SHARED		BIT(0)
+#define CI_HDRC_DISABLE_DEVICE_STREAMING	BIT(1)
 #define CI_HDRC_SUPPORTS_RUNTIME_PM	BIT(2)
-#define CI_HDRC_DISABLE_STREAMING	BIT(3)
+#define CI_HDRC_DISABLE_HOST_STREAMING	BIT(3)
+#define CI_HDRC_DISABLE_STREAMING (CI_HDRC_DISABLE_DEVICE_STREAMING |	\
+		CI_HDRC_DISABLE_HOST_STREAMING)
 	/*
 	 * Only set it when DCCPARAMS.DC==1 and DCCPARAMS.HC==1,
 	 * but otg is not supported (no register otgsc).
-- 
1.9.1

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[PATCH v2 03/10] usb: chipidea: imx: add stream mode enable for device mode at imx6sl/imx6sx

[Peter Chen]

Stream mode enable is known for better performance, this stream mode
enable patch has been passed with stress tests at device mode for
imx6sl and imx6sx, and no issue is found.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/chipidea/ci_hdrc_imx.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 6d2a85a..3f41679 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -29,26 +29,31 @@ struct ci_hdrc_imx_platform_flag {
 };
 
 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
+		CI_HDRC_DISABLE_STREAMING,
 };
 
 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
 	.flags = CI_HDRC_IMX28_WRITE_FIX |
-		CI_HDRC_TURN_VBUS_EARLY_ON,
+		CI_HDRC_TURN_VBUS_EARLY_ON |
+		CI_HDRC_DISABLE_STREAMING,
 };
 
 static const struct ci_hdrc_imx_platform_flag imx6q_usb_data = {
 	.flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
-		CI_HDRC_TURN_VBUS_EARLY_ON,
+		CI_HDRC_TURN_VBUS_EARLY_ON |
+		CI_HDRC_DISABLE_STREAMING,
 };
 
 static const struct ci_hdrc_imx_platform_flag imx6sl_usb_data = {
 	.flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
-		CI_HDRC_TURN_VBUS_EARLY_ON,
+		CI_HDRC_TURN_VBUS_EARLY_ON |
+		CI_HDRC_DISABLE_HOST_STREAMING,
 };
 
 static const struct ci_hdrc_imx_platform_flag imx6sx_usb_data = {
 	.flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
-		CI_HDRC_TURN_VBUS_EARLY_ON,
+		CI_HDRC_TURN_VBUS_EARLY_ON |
+		CI_HDRC_DISABLE_HOST_STREAMING,
 };
 
 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
@@ -126,8 +131,7 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	struct ci_hdrc_platform_data pdata = {
 		.name		= dev_name(&pdev->dev),
 		.capoffset	= DEF_CAPOFFSET,
-		.flags		= CI_HDRC_DISABLE_STREAMING |
-					CI_HDRC_SET_NON_ZERO_TTHA,
+		.flags		= CI_HDRC_SET_NON_ZERO_TTHA,
 	};
 	int ret;
 	const struct of_device_id *of_id =
-- 
1.9.1

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[PATCH v2 04/10] Doc: usb: ci-hdrc-usb2: add ahb-burst-config for binding doc

[Peter Chen]

It is used to change ahb burst configuration for platforms, it is
vendor specific.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index 4159c8c..3c377a3 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -32,6 +32,8 @@ Optional properties:
 - external-vbus-divider: (FSL only) enables off-chip resistor divider for Vbus
 - itc-setting: interrupt threshold control register control, the setting
   should be aligned with ITC bits at register USBCMD.
+- ahb-burst-config: it is vendor dependent, the required value should be
+  aligned with AHBBRST at SBUSCFG, the range is from 0x0 to 0x7.
 
 Example:
 
@@ -44,4 +46,6 @@ Example:
 		phy-names = "usb-phy";
 		vbus-supply = <&reg_usb0_vbus>;
 		gadget-itc-setting = <0x4>; /* 4 micro-frames */
+		 /* Incremental burst of unspecified length */
+		ahb-burst-config = <0x0>;
 	};
-- 
1.9.1

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[PATCH v2 05/10] ARM: imx6: set ahb-burst-config as 0 for USB

[Peter Chen]

After setting ahb burst configuration as 0, we can increase tx/rx
burst size, it will improve the USB performance

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 arch/arm/boot/dts/imx6qdl.dtsi | 4 ++++
 arch/arm/boot/dts/imx6sl.dtsi  | 3 +++
 arch/arm/boot/dts/imx6sx.dtsi  | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index e6d1359..42d62b0 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -853,6 +853,7 @@
 				clocks = <&clks IMX6QDL_CLK_USBOH3>;
 				fsl,usbphy = <&usbphy1>;
 				fsl,usbmisc = <&usbmisc 0>;
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -864,6 +865,7 @@
 				fsl,usbphy = <&usbphy2>;
 				fsl,usbmisc = <&usbmisc 1>;
 				dr_mode = "host";
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -874,6 +876,7 @@
 				clocks = <&clks IMX6QDL_CLK_USBOH3>;
 				fsl,usbmisc = <&usbmisc 2>;
 				dr_mode = "host";
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -884,6 +887,7 @@
 				clocks = <&clks IMX6QDL_CLK_USBOH3>;
 				fsl,usbmisc = <&usbmisc 3>;
 				dr_mode = "host";
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/imx6sl.dtsi b/arch/arm/boot/dts/imx6sl.dtsi
index a78e715..066fac9 100644
--- a/arch/arm/boot/dts/imx6sl.dtsi
+++ b/arch/arm/boot/dts/imx6sl.dtsi
@@ -688,6 +688,7 @@
 				clocks = <&clks IMX6SL_CLK_USBOH3>;
 				fsl,usbphy = <&usbphy1>;
 				fsl,usbmisc = <&usbmisc 0>;
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -698,6 +699,7 @@
 				clocks = <&clks IMX6SL_CLK_USBOH3>;
 				fsl,usbphy = <&usbphy2>;
 				fsl,usbmisc = <&usbmisc 1>;
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -708,6 +710,7 @@
 				clocks = <&clks IMX6SL_CLK_USBOH3>;
 				fsl,usbmisc = <&usbmisc 2>;
 				dr_mode = "host";
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
index 708175d..3656a1d 100644
--- a/arch/arm/boot/dts/imx6sx.dtsi
+++ b/arch/arm/boot/dts/imx6sx.dtsi
@@ -746,6 +746,7 @@
 				fsl,usbphy = <&usbphy1>;
 				fsl,usbmisc = <&usbmisc 0>;
 				fsl,anatop = <&anatop>;
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -756,6 +757,7 @@
 				clocks = <&clks IMX6SX_CLK_USBOH3>;
 				fsl,usbphy = <&usbphy2>;
 				fsl,usbmisc = <&usbmisc 1>;
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
@@ -768,6 +770,7 @@
 				phy_type = "hsic";
 				fsl,anatop = <&anatop>;
 				dr_mode = "host";
+				ahb-burst-config = <0x0>;
 				status = "disabled";
 			};
 
-- 
1.9.1

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[PATCH v2 06/10] usb: chipidea: add ahb burst configuration interface

[Peter Chen]

The users can change it through dts or platform data if they
want to change the default value.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/chipidea/bits.h  |  3 +++
 drivers/usb/chipidea/core.c  | 14 ++++++++++++++
 include/linux/usb/chipidea.h |  2 ++
 3 files changed, 19 insertions(+)

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 831a8f6..462ad02 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -25,6 +25,9 @@
 #define VERSION		      (0xF << 25)
 #define CIVERSION	      (0x7 << 29)
 
+/* SBUSCFG */
+#define AHBBRST_MASK		0x7
+
 /* HCCPARAMS */
 #define HCCPARAMS_LEN         BIT(17)
 
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 38bd036..f60cbf6 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -439,6 +439,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
 
 	hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
 
+	if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
+		hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
+			ci->platdata->ahb_burst_config);
 }
 
 /**
@@ -647,6 +650,17 @@ static int ci_get_platdata(struct device *dev,
 		}
 	}
 
+	if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
+		ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
+			&platdata->ahb_burst_config);
+		if (ret) {
+			dev_err(dev,
+				"failed to get ahb-burst-config\n");
+			return ret;
+		}
+		platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
+	}
+
 	return 0;
 }
 
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 034f7e1..fe3c8eb 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -33,6 +33,7 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_FORCE_FULLSPEED		BIT(6)
 #define CI_HDRC_TURN_VBUS_EARLY_ON	BIT(7)
 #define CI_HDRC_SET_NON_ZERO_TTHA	BIT(8)
+#define CI_HDRC_OVERRIDE_AHB_BURST	BIT(9)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
@@ -42,6 +43,7 @@ struct ci_hdrc_platform_data {
 	bool			tpl_support;
 	/* interrupt threshold setting */
 	u32			itc_setting;
+	u32			ahb_burst_config;
 };
 
 /* Default offset of capability registers */
-- 
1.9.1

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[PATCH v2 07/10] usb: chipidea: usbmisc_imx: add non-burst setting for imx6

[Peter Chen]

With this setting and AHBBRST at SBUSCFG as "Incremental burst of
unspecified length", each non-burst size can be taken as single
transfer. It is benefit for non-burst size transfer.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/chipidea/usbmisc_imx.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 3cefd49..5ddab30 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -54,6 +54,7 @@
 #define MX53_USB_PHYCTRL1_PLLDIV_MASK	0x3
 #define MX53_USB_PLL_DIV_24_MHZ		0x01
 
+#define MX6_BM_NON_BURST_SETTING	BIT(1)
 #define MX6_BM_OVER_CUR_DIS		BIT(7)
 #define MX6_BM_WAKEUP_ENABLE		BIT(10)
 #define MX6_BM_ID_WAKEUP		BIT(16)
@@ -255,14 +256,21 @@ static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
 	if (data->index > 3)
 		return -EINVAL;
 
+	spin_lock_irqsave(&usbmisc->lock, flags);
+
 	if (data->disable_oc) {
-		spin_lock_irqsave(&usbmisc->lock, flags);
 		reg = readl(usbmisc->base + data->index * 4);
 		writel(reg | MX6_BM_OVER_CUR_DIS,
 			usbmisc->base + data->index * 4);
-		spin_unlock_irqrestore(&usbmisc->lock, flags);
 	}
 
+	/* SoC non-burst setting */
+	reg = readl(usbmisc->base + data->index * 4);
+	writel(reg | MX6_BM_NON_BURST_SETTING,
+			usbmisc->base + data->index * 4);
+
+	spin_unlock_irqrestore(&usbmisc->lock, flags);
+
 	usbmisc_imx6q_set_wakeup(data, false);
 
 	return 0;
-- 
1.9.1

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[PATCH v2 08/10] Doc: usb: ci-hdrc-usb2: add tx(rx)-burst-config-dword for binding doc

[Peter Chen]

It is used to override the default setting for burst size, changing
burst size takes effect only when the SBUSCFG.AHBBRST = 0.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index 3c377a3..0f0929c 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -34,6 +34,10 @@ Optional properties:
   should be aligned with ITC bits at register USBCMD.
 - ahb-burst-config: it is vendor dependent, the required value should be
   aligned with AHBBRST at SBUSCFG, the range is from 0x0 to 0x7.
+- tx-burst-size-dword: it is vendor dependent, the tx burst size in dword
+  (4 bytes).
+- rx-burst-size-dword: it is vendor dependent, the rx burst size in dword
+  (4 bytes).
 
 Example:
 
@@ -48,4 +52,6 @@ Example:
 		gadget-itc-setting = <0x4>; /* 4 micro-frames */
 		 /* Incremental burst of unspecified length */
 		ahb-burst-config = <0x0>;
+		tx-burst-size-dword = <0x10>; /* 64 bytes */
+		rx-burst-size-dword = <0x10>;
 	};
-- 
1.9.1

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[PATCH v2 09/10] ARM: imx6: change default burst size for USB

[Peter Chen]

It can improve the USB performance when choosing larger
burst size at some systems (bus size is larger), there is
no side effect if this burst size is larger than bus size.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 arch/arm/boot/dts/imx6qdl.dtsi | 8 ++++++++
 arch/arm/boot/dts/imx6sl.dtsi  | 6 ++++++
 arch/arm/boot/dts/imx6sx.dtsi  | 6 ++++++
 3 files changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index 42d62b0..b9f2e3a 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -854,6 +854,8 @@
 				fsl,usbphy = <&usbphy1>;
 				fsl,usbmisc = <&usbmisc 0>;
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -866,6 +868,8 @@
 				fsl,usbmisc = <&usbmisc 1>;
 				dr_mode = "host";
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -877,6 +881,8 @@
 				fsl,usbmisc = <&usbmisc 2>;
 				dr_mode = "host";
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -888,6 +894,8 @@
 				fsl,usbmisc = <&usbmisc 3>;
 				dr_mode = "host";
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/imx6sl.dtsi b/arch/arm/boot/dts/imx6sl.dtsi
index 066fac9..627549f 100644
--- a/arch/arm/boot/dts/imx6sl.dtsi
+++ b/arch/arm/boot/dts/imx6sl.dtsi
@@ -689,6 +689,8 @@
 				fsl,usbphy = <&usbphy1>;
 				fsl,usbmisc = <&usbmisc 0>;
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -700,6 +702,8 @@
 				fsl,usbphy = <&usbphy2>;
 				fsl,usbmisc = <&usbmisc 1>;
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -711,6 +715,8 @@
 				fsl,usbmisc = <&usbmisc 2>;
 				dr_mode = "host";
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
index 3656a1d..6844e9e 100644
--- a/arch/arm/boot/dts/imx6sx.dtsi
+++ b/arch/arm/boot/dts/imx6sx.dtsi
@@ -747,6 +747,8 @@
 				fsl,usbmisc = <&usbmisc 0>;
 				fsl,anatop = <&anatop>;
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -758,6 +760,8 @@
 				fsl,usbphy = <&usbphy2>;
 				fsl,usbmisc = <&usbmisc 1>;
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
@@ -771,6 +775,8 @@
 				fsl,anatop = <&anatop>;
 				dr_mode = "host";
 				ahb-burst-config = <0x0>;
+				tx-burst-size-dword = <0x10>;
+				rx-burst-size-dword = <0x10>;
 				status = "disabled";
 			};
 
-- 
1.9.1

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[PATCH v2 10/10] usb: chipidea: add tx/rx burst size configuration interface

[Peter Chen]

The user can adjust it through dts or platform data

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/chipidea/bits.h  |  4 ++++
 drivers/usb/chipidea/ci.h    |  1 +
 drivers/usb/chipidea/core.c  | 35 +++++++++++++++++++++++++++++++++++
 include/linux/usb/chipidea.h |  4 ++++
 4 files changed, 44 insertions(+)

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 462ad02..e462f55 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -61,6 +61,10 @@
 /* Set non-zero value for internal TT Hub address representation */
 #define TTCTRL_TTHA		(0x7fUL << 24)
 
+/* BURSTSIZE */
+#define RX_BURST_MASK		0xff
+#define TX_BURST_MASK		0xff00
+
 /* PORTSC */
 #define PORTSC_CCS            BIT(0)
 #define PORTSC_CSC            BIT(1)
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index b562544..41d7cf6 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -51,6 +51,7 @@ enum ci_hw_regs {
 	OP_DEVICEADDR,
 	OP_ENDPTLISTADDR,
 	OP_TTCTRL,
+	OP_BURSTSIZE,
 	OP_PORTSC,
 	OP_DEVLC,
 	OP_OTGSC,
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index f60cbf6..0375412 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -86,6 +86,7 @@ static const u8 ci_regs_nolpm[] = {
 	[OP_DEVICEADDR]		= 0x14U,
 	[OP_ENDPTLISTADDR]	= 0x18U,
 	[OP_TTCTRL]		= 0x1CU,
+	[OP_BURSTSIZE]		= 0x20U,
 	[OP_PORTSC]		= 0x44U,
 	[OP_DEVLC]		= 0x84U,
 	[OP_OTGSC]		= 0x64U,
@@ -109,6 +110,7 @@ static const u8 ci_regs_lpm[] = {
 	[OP_DEVICEADDR]		= 0x14U,
 	[OP_ENDPTLISTADDR]	= 0x18U,
 	[OP_TTCTRL]		= 0x1CU,
+	[OP_BURSTSIZE]		= 0x20U,
 	[OP_PORTSC]		= 0x44U,
 	[OP_DEVLC]		= 0x84U,
 	[OP_OTGSC]		= 0xC4U,
@@ -442,6 +444,17 @@ void ci_platform_configure(struct ci_hdrc *ci)
 	if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
 		hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
 			ci->platdata->ahb_burst_config);
+
+	/* override burst size, take effect only when ahb_burst_config is 0 */
+	if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
+		if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
+			hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
+			ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
+
+		if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
+			hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
+				ci->platdata->rx_burst_size);
+	}
 }
 
 /**
@@ -661,6 +674,28 @@ static int ci_get_platdata(struct device *dev,
 		platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
 	}
 
+	if (of_find_property(dev->of_node, "tx-burst-size-dword", NULL)) {
+		ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
+			&platdata->tx_burst_size);
+		if (ret) {
+			dev_err(dev,
+				"failed to get tx-burst-size-dword\n");
+			return ret;
+		}
+		platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
+	}
+
+	if (of_find_property(dev->of_node, "rx-burst-size-dword", NULL)) {
+		ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
+			&platdata->rx_burst_size);
+		if (ret) {
+			dev_err(dev,
+				"failed to get rx-burst-size-dword\n");
+			return ret;
+		}
+		platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
+	}
+
 	return 0;
 }
 
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index fe3c8eb..a41833c 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -34,6 +34,8 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_TURN_VBUS_EARLY_ON	BIT(7)
 #define CI_HDRC_SET_NON_ZERO_TTHA	BIT(8)
 #define CI_HDRC_OVERRIDE_AHB_BURST	BIT(9)
+#define CI_HDRC_OVERRIDE_TX_BURST	BIT(10)
+#define CI_HDRC_OVERRIDE_RX_BURST	BIT(11)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
@@ -44,6 +46,8 @@ struct ci_hdrc_platform_data {
 	/* interrupt threshold setting */
 	u32			itc_setting;
 	u32			ahb_burst_config;
+	u32			tx_burst_size;
+	u32			rx_burst_size;
 };
 
 /* Default offset of capability registers */
-- 
1.9.1

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Re: [PATCH v2 04/10] Doc: usb: ci-hdrc-usb2: add ahb-burst-config for binding doc

[Rob Herring]

On Sun, Aug 2, 2015 at 11:47 PM, Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> wrote:
> It is used to change ahb burst configuration for platforms, it is
> vendor specific.
>
> Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> index 4159c8c..3c377a3 100644
> --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> @@ -32,6 +32,8 @@ Optional properties:
>  - external-vbus-divider: (FSL only) enables off-chip resistor divider for Vbus
>  - itc-setting: interrupt threshold control register control, the setting
>    should be aligned with ITC bits at register USBCMD.
> +- ahb-burst-config: it is vendor dependent, the required value should be
> +  aligned with AHBBRST at SBUSCFG, the range is from 0x0 to 0x7.

What do the values mean and what happens if the property is not
present? Please define that here.

Rob

>
>  Example:
>
> @@ -44,4 +46,6 @@ Example:
>                 phy-names = "usb-phy";
>                 vbus-supply = <&reg_usb0_vbus>;
>                 gadget-itc-setting = <0x4>; /* 4 micro-frames */
> +                /* Incremental burst of unspecified length */
> +               ahb-burst-config = <0x0>;
>         };
> --
> 1.9.1
>
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Re: [PATCH v2 06/10] usb: chipidea: add ahb burst configuration interface

[Rob Herring]

On Sun, Aug 2, 2015 at 11:47 PM, Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> wrote:
> The users can change it through dts or platform data if they
> want to change the default value.
>
> Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> ---
>  drivers/usb/chipidea/bits.h  |  3 +++
>  drivers/usb/chipidea/core.c  | 14 ++++++++++++++
>  include/linux/usb/chipidea.h |  2 ++
>  3 files changed, 19 insertions(+)
>
> diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
> index 831a8f6..462ad02 100644
> --- a/drivers/usb/chipidea/bits.h
> +++ b/drivers/usb/chipidea/bits.h
> @@ -25,6 +25,9 @@
>  #define VERSION                      (0xF << 25)
>  #define CIVERSION            (0x7 << 29)
>
> +/* SBUSCFG */
> +#define AHBBRST_MASK           0x7
> +
>  /* HCCPARAMS */
>  #define HCCPARAMS_LEN         BIT(17)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 38bd036..f60cbf6 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -439,6 +439,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
>
>         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
>
> +       if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
> +               hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
> +                       ci->platdata->ahb_burst_config);
>  }
>
>  /**
> @@ -647,6 +650,17 @@ static int ci_get_platdata(struct device *dev,
>                 }
>         }
>
> +       if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
> +               ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> +                       &platdata->ahb_burst_config);
> +               if (ret) {
> +                       dev_err(dev,
> +                               "failed to get ahb-burst-config\n");
> +                       return ret;
> +               }
> +               platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> +       }
> +

This can be simplified to:

ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
&platdata->ahb_burst_config);
if (!ret)
  platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;

The error condition can't really happen.

Rob
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Re: [PATCH v2 06/10] usb: chipidea: add ahb burst configuration interface

[Peter Chen]

On Mon, Aug 03, 2015 at 09:04:27AM -0500, Rob Herring wrote:
> On Sun, Aug 2, 2015 at 11:47 PM, Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> wrote:
> > The users can change it through dts or platform data if they
> > want to change the default value.
> >
> > Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> > ---
> >  drivers/usb/chipidea/bits.h  |  3 +++
> >  drivers/usb/chipidea/core.c  | 14 ++++++++++++++
> >  include/linux/usb/chipidea.h |  2 ++
> >  3 files changed, 19 insertions(+)
> >
> > diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
> > index 831a8f6..462ad02 100644
> > --- a/drivers/usb/chipidea/bits.h
> > +++ b/drivers/usb/chipidea/bits.h
> > @@ -25,6 +25,9 @@
> >  #define VERSION                      (0xF << 25)
> >  #define CIVERSION            (0x7 << 29)
> >
> > +/* SBUSCFG */
> > +#define AHBBRST_MASK           0x7
> > +
> >  /* HCCPARAMS */
> >  #define HCCPARAMS_LEN         BIT(17)
> >
> > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> > index 38bd036..f60cbf6 100644
> > --- a/drivers/usb/chipidea/core.c
> > +++ b/drivers/usb/chipidea/core.c
> > @@ -439,6 +439,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
> >
> >         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
> >
> > +       if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
> > +               hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
> > +                       ci->platdata->ahb_burst_config);
> >  }
> >
> >  /**
> > @@ -647,6 +650,17 @@ static int ci_get_platdata(struct device *dev,
> >                 }
> >         }
> >
> > +       if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
> > +               ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> > +                       &platdata->ahb_burst_config);
> > +               if (ret) {
> > +                       dev_err(dev,
> > +                               "failed to get ahb-burst-config\n");
> > +                       return ret;
> > +               }
> > +               platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> > +       }
> > +
> 
> This can be simplified to:
> 
> ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> &platdata->ahb_burst_config);
> if (!ret)
>   platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> 
> The error condition can't really happen.
> 
> Rob

Thanks, I will change others accordingly.

-- 

Best Regards,
Peter Chen
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Re: [PATCH v2 06/10] usb: chipidea: add ahb burst configuration interface

[Peter Chen]

On Mon, Aug 03, 2015 at 09:04:27AM -0500, Rob Herring wrote:
> On Sun, Aug 2, 2015 at 11:47 PM, Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org> wrote:
> > The users can change it through dts or platform data if they
> > want to change the default value.
> >
> > Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> > ---
> >  drivers/usb/chipidea/bits.h  |  3 +++
> >  drivers/usb/chipidea/core.c  | 14 ++++++++++++++
> >  include/linux/usb/chipidea.h |  2 ++
> >  3 files changed, 19 insertions(+)
> >
> > diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
> > index 831a8f6..462ad02 100644
> > --- a/drivers/usb/chipidea/bits.h
> > +++ b/drivers/usb/chipidea/bits.h
> > @@ -25,6 +25,9 @@
> >  #define VERSION                      (0xF << 25)
> >  #define CIVERSION            (0x7 << 29)
> >
> > +/* SBUSCFG */
> > +#define AHBBRST_MASK           0x7
> > +
> >  /* HCCPARAMS */
> >  #define HCCPARAMS_LEN         BIT(17)
> >
> > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> > index 38bd036..f60cbf6 100644
> > --- a/drivers/usb/chipidea/core.c
> > +++ b/drivers/usb/chipidea/core.c
> > @@ -439,6 +439,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
> >
> >         hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
> >
> > +       if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
> > +               hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
> > +                       ci->platdata->ahb_burst_config);
> >  }
> >
> >  /**
> > @@ -647,6 +650,17 @@ static int ci_get_platdata(struct device *dev,
> >                 }
> >         }
> >
> > +       if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
> > +               ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> > +                       &platdata->ahb_burst_config);
> > +               if (ret) {
> > +                       dev_err(dev,
> > +                               "failed to get ahb-burst-config\n");
> > +                       return ret;
> > +               }
> > +               platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> > +       }
> > +
> 
> This can be simplified to:
> 
> ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> &platdata->ahb_burst_config);
> if (!ret)
>   platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> 
> The error condition can't really happen.
> 

Why the error condition can't really happen? If the value of
this property at dts is invalid, we would like return error.

For non-exist property, it is normal case; for invalid property,
we would like return error, and quit.

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Best Regards,
Peter Chen
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Re: [PATCH v2 00/10] USB: chipidea misc patches

[Shawn Guo]

On Mon, Aug 03, 2015 at 12:47:08PM +0800, Peter Chen wrote:
> Hi all,
> 
> In this series, I add several new interfaces for chipidea driver,
> they are mainly for system configuration adjustment. The USB
> performance may be improved with these configuration changing,
> but each vendor driver owner needs to consult with your IC
> owner which configuration parameters are suitable for your system
> before changing it, and only change it if necessary.
> 
> The other changes are for imx, it shows how imx uses these interfaces.
> Shawn, the patch [5/10] and [9/10] are dts changes, help to review it
> please.

Ping me, after driver and bindings are accepted.  Then I will pick up
the dts changes.

Shawn
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Re: [PATCH v2 00/10] USB: chipidea misc patches

[Peter Chen]

On Wed, Aug 05, 2015 at 10:08:14PM +0800, Shawn Guo wrote:
> On Mon, Aug 03, 2015 at 12:47:08PM +0800, Peter Chen wrote:
> > Hi all,
> > 
> > In this series, I add several new interfaces for chipidea driver,
> > they are mainly for system configuration adjustment. The USB
> > performance may be improved with these configuration changing,
> > but each vendor driver owner needs to consult with your IC
> > owner which configuration parameters are suitable for your system
> > before changing it, and only change it if necessary.
> > 
> > The other changes are for imx, it shows how imx uses these interfaces.
> > Shawn, the patch [5/10] and [9/10] are dts changes, help to review it
> > please.
> 
> Ping me, after driver and bindings are accepted.  Then I will pick up
> the dts changes.
> 

Shawn, The driver and bingings have been accepted.
And I send v2 changes for you, which apply changes for imx6ul.

-- 

Best Regards,
Peter Chen