[U-Boot] [PATCH 0/2] dfu: samsung: Commits to allow sending and storing large files via DFU

[U-Boot] [PATCH 0/2] dfu: samsung: Commits to allow sending and storing large files via DFU

[Lukasz Majewski]

Those commits allow sending and storing large files (e.g. 26 MiB) on the Odroid XU3 board.

On purpose they are sent together to shed light on the process of tunning board to
be capable of large files transfer.

I would be _REALLY_ grateful for excessive testing, since I'm not able to test this code
on NAND based devices. Please support me and test this patch for potential regressions.

This change applies on the u-boot-master tree.
SHA1: aada3d062a0cacde1e783af2ac560f2a0fdf3682

Lukasz Majewski (2):
  dfu: usb: f_dfu: Set deferred call for dfu_flush() function
  dfu: odroid xu3: Define DFU_MANIFEST_POLL_TIMEOUT to handle large
    files transmission and storage

 common/cmd_dfu.c             | 20 ++++++++++++++++++++
 drivers/usb/gadget/f_dfu.c   | 11 +++--------
 include/configs/odroid_xu3.h |  1 +
 include/dfu.h                | 25 +++++++++++++++++++++++++
 4 files changed, 49 insertions(+), 8 deletions(-)

-- 
2.0.0.rc2

[U-Boot] [PATCH 1/2] dfu: usb: f_dfu: Set deferred call for dfu_flush() function

[Lukasz Majewski]

This patch fixes situation when one would like to write large file into
medium with the file system (fat, ext4, etc).
This change sets file size limitation to the DFU internal buffer size.

Since u-boot is not supporting interrupts and seek on file systems, it
becomes challenging to store large file appropriately.

To reproduce this error - create large file (around 26 MiB) and sent it
to the target board.

Lets examine the flow of USB transactions:

0. DFU uses EP0 with 64B MPS [Max Packet Size]

1. Send file - OUT (PC->target) - dat_26MiB.img is sent with 4096 B transactions

2. Get status - OUT (PC->target) - wait for DFU_STATE_dfuDNLOAD_IDLE (0x05) sent
				   from target board - IN transaction
				   (target->PC)

3. The whole file content is sent to target - OUT (PC->target) with ZLP [Zero
					      Length Packet]

Now the interesting part starts:

4. OUT (PC->target) Setup transaction (request to share DFU state)

5. IN (target->PC) - reply the current DFU state
	- In the UDC driver the req->completion (with dfu_flush) is called
	  after successful IN transfer.
	- The dfu_flush() (called from req->completion callback) saves the
	  whole file at once (u-boot doesn't support seek on fs).
	  Such operation takes considerable time. When the file
	  is large - e.g. 26MiB - this time may be more than 5 seconds.

6. OUT (PC->target) - ZLP, is send in the same time when dfu_flush()
 writes data to eMMC memory.
 The dfu-util application has hard coded timeout on USB transaction
 completion set to 5 seconds (it uses libusb calls).

When the file to store is large (e.g. 26 MiB) the time needed to write it
may excess the dfu-util timeout and following error message will be displayed:
"unable to read DFU status" on the HOST PC console.

This change is supposed to leverage DFU's part responsible for storing files
on file systems. Other DFU operations - i.e. raw/partition write to NAND and
eMMC should work as before.

The only functional change is the error reporting. When dfu_flush() fails
the u-boot prompt will exit with error information and dfu-util application
exits afterwards as well.

Test HW:
- Odroid XU3 (Exynos5433) - test with large file
- Trats (Exynos4210) - test for regression - eMMC, raw,

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Reported-by: Alex Gdalevich <agdalevich@axion-biosystems.com>
---
 common/cmd_dfu.c           | 20 ++++++++++++++++++++
 drivers/usb/gadget/f_dfu.c | 11 +++--------
 include/dfu.h              | 25 +++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/common/cmd_dfu.c b/common/cmd_dfu.c
index 6d95ce9..d8aae26 100644
--- a/common/cmd_dfu.c
+++ b/common/cmd_dfu.c
@@ -79,6 +79,26 @@ static int do_dfu(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		if (ctrlc())
 			goto exit;
 
+		if (dfu_get_defer_flush()) {
+			/*
+			 * Call to usb_gadget_handle_interrupts() is necessary
+			 * to act on ZLP OUT transaction from HOST PC after
+			 * transmitting the whole file.
+			 *
+			 * If this ZLP OUT packet is NAK'ed, the HOST libusb
+			 * function fails after timeout (by default it is set to
+			 * 5 seconds). In such situation the dfu-util program
+			 * exits with error message.
+			 */
+			usb_gadget_handle_interrupts(controller_index);
+			ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
+			dfu_set_defer_flush(NULL);
+			if (ret) {
+				error("Deferred dfu_flush() failed!");
+				goto exit;
+			}
+		}
+
 		WATCHDOG_RESET();
 		usb_gadget_handle_interrupts(controller_index);
 	}
diff --git a/drivers/usb/gadget/f_dfu.c b/drivers/usb/gadget/f_dfu.c
index 77a1567..7d88008 100644
--- a/drivers/usb/gadget/f_dfu.c
+++ b/drivers/usb/gadget/f_dfu.c
@@ -44,6 +44,8 @@ struct f_dfu {
 	unsigned int                    poll_timeout;
 };
 
+struct dfu_entity *dfu_defer_flush;
+
 typedef int (*dfu_state_fn) (struct f_dfu *,
 			     const struct usb_ctrlrequest *,
 			     struct usb_gadget *,
@@ -167,14 +169,7 @@ static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req)
 static void dnload_request_flush(struct usb_ep *ep, struct usb_request *req)
 {
 	struct f_dfu *f_dfu = req->context;
-	int ret;
-
-	ret = dfu_flush(dfu_get_entity(f_dfu->altsetting), req->buf,
-			req->length, f_dfu->blk_seq_num);
-	if (ret) {
-		f_dfu->dfu_status = DFU_STATUS_errUNKNOWN;
-		f_dfu->dfu_state = DFU_STATE_dfuERROR;
-	}
+	dfu_set_defer_flush(dfu_get_entity(f_dfu->altsetting));
 }
 
 static inline int dfu_get_manifest_timeout(struct dfu_entity *dfu)
diff --git a/include/dfu.h b/include/dfu.h
index 6118dc2..f39d3f1 100644
--- a/include/dfu.h
+++ b/include/dfu.h
@@ -163,6 +163,31 @@ int dfu_read(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
 int dfu_write(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
 int dfu_flush(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
 
+/*
+ * dfu_defer_flush - pointer to store dfu_entity for deferred flashing.
+ *		     It should be NULL when not used.
+ */
+extern struct dfu_entity *dfu_defer_flush;
+/**
+ * dfu_get_defer_flush - get current value of dfu_defer_flush pointer
+ *
+ * @return - value of the dfu_defer_flush pointer
+ */
+static inline struct dfu_entity *dfu_get_defer_flush(void)
+{
+	return dfu_defer_flush;
+}
+
+/**
+ * dfu_set_defer_flush - set the dfu_defer_flush pointer
+ *
+ * @param dfu - pointer to the dfu_entity, which should be written
+ */
+static inline void dfu_set_defer_flush(struct dfu_entity *dfu)
+{
+	dfu_defer_flush = dfu;
+}
+
 /**
  * dfu_write_from_mem_addr - write data from memory to DFU managed medium
  *
-- 
2.0.0.rc2

[U-Boot] [PATCH 2/2] dfu: odroid xu3: Define DFU_MANIFEST_POLL_TIMEOUT to handle large files transmission and storage

[Lukasz Majewski]

As tested on the Odroid XU3, large files to be stored on the file system
require considerable time to be physically written to the medium.

The default 300 ms is not enough to store large file (e.g. 26 MiB).
To fix this situation the DFU_MANIFEST_POLL_TIMEOUT has been defined.

It is used to cease the communication with dfu-util and allow the target
board to store the data on file system.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
---
 include/configs/odroid_xu3.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/configs/odroid_xu3.h b/include/configs/odroid_xu3.h
index 648e48b..500f0f9 100644
--- a/include/configs/odroid_xu3.h
+++ b/include/configs/odroid_xu3.h
@@ -69,6 +69,7 @@
 #define CONFIG_CMD_DFU
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE	SZ_32M
 #define DFU_DEFAULT_POLL_TIMEOUT	300
+#define DFU_MANIFEST_POLL_TIMEOUT       25000
 
 /* THOR */
 #define CONFIG_G_DNL_THOR_VENDOR_NUM	CONFIG_G_DNL_VENDOR_NUM
-- 
2.0.0.rc2

[U-Boot] [PATCH 1/2] dfu: usb: f_dfu: Set deferred call for dfu_flush() function

[Stephen Warren]

On 01/28/2016 09:46 AM, Lukasz Majewski wrote:
> This patch fixes situation when one would like to write large file into
> medium with the file system (fat, ext4, etc).
> This change sets file size limitation to the DFU internal buffer size.

Tested-by: Stephen Warren <swarren@nvidia.com>

I tested this on NVIDIA's Jetson TX1 using test/py's test_dfu, with 
existing transfer sizes (63 bytes ... 8MB) rather than attempting to do 
anything with large files.

[U-Boot] [PATCH 0/2] dfu: samsung: Commits to allow sending and storing large files via DFU

[Heiko Schocher]

Hello Lukasz,

Am 28.01.2016 um 17:46 schrieb Lukasz Majewski:
> Those commits allow sending and storing large files (e.g. 26 MiB) on the Odroid XU3 board.
>
> On purpose they are sent together to shed light on the process of tunning board to
> be capable of large files transfer.
>
> I would be _REALLY_ grateful for excessive testing, since I'm not able to test this code
> on NAND based devices. Please support me and test this patch for potential regressions.
>
> This change applies on the u-boot-master tree.
> SHA1: aada3d062a0cacde1e783af2ac560f2a0fdf3682
>
> Lukasz Majewski (2):
>    dfu: usb: f_dfu: Set deferred call for dfu_flush() function
>    dfu: odroid xu3: Define DFU_MANIFEST_POLL_TIMEOUT to handle large
>      files transmission and storage
>
>   common/cmd_dfu.c             | 20 ++++++++++++++++++++
>   drivers/usb/gadget/f_dfu.c   | 11 +++--------
>   include/configs/odroid_xu3.h |  1 +
>   include/dfu.h                | 25 +++++++++++++++++++++++++
>   4 files changed, 49 insertions(+), 8 deletions(-)

Tested on the smartweb board (NAND):
http://xeidos.ddns.net/buildbot/builders/smartweb_dfu/builds/49/steps/shell/logs/tbotlog

with current U-Boot mainline.

bye,
Heiko
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] [PATCH 1/2] dfu: usb: f_dfu: Set deferred call for dfu_flush() function

[Heiko Schocher]

Hello Lukasz,

Am 28.01.2016 um 17:46 schrieb Lukasz Majewski:
> This patch fixes situation when one would like to write large file into
> medium with the file system (fat, ext4, etc).
> This change sets file size limitation to the DFU internal buffer size.
>
> Since u-boot is not supporting interrupts and seek on file systems, it
> becomes challenging to store large file appropriately.
>
> To reproduce this error - create large file (around 26 MiB) and sent it
> to the target board.
>
> Lets examine the flow of USB transactions:
>
> 0. DFU uses EP0 with 64B MPS [Max Packet Size]
>
> 1. Send file - OUT (PC->target) - dat_26MiB.img is sent with 4096 B transactions
>
> 2. Get status - OUT (PC->target) - wait for DFU_STATE_dfuDNLOAD_IDLE (0x05) sent
> 				   from target board - IN transaction
> 				   (target->PC)
>
> 3. The whole file content is sent to target - OUT (PC->target) with ZLP [Zero
> 					      Length Packet]
>
> Now the interesting part starts:
>
> 4. OUT (PC->target) Setup transaction (request to share DFU state)
>
> 5. IN (target->PC) - reply the current DFU state
> 	- In the UDC driver the req->completion (with dfu_flush) is called
> 	  after successful IN transfer.
> 	- The dfu_flush() (called from req->completion callback) saves the
> 	  whole file at once (u-boot doesn't support seek on fs).
> 	  Such operation takes considerable time. When the file
> 	  is large - e.g. 26MiB - this time may be more than 5 seconds.
>
> 6. OUT (PC->target) - ZLP, is send in the same time when dfu_flush()
>   writes data to eMMC memory.
>   The dfu-util application has hard coded timeout on USB transaction
>   completion set to 5 seconds (it uses libusb calls).
>
> When the file to store is large (e.g. 26 MiB) the time needed to write it
> may excess the dfu-util timeout and following error message will be displayed:
> "unable to read DFU status" on the HOST PC console.
>
> This change is supposed to leverage DFU's part responsible for storing files
> on file systems. Other DFU operations - i.e. raw/partition write to NAND and
> eMMC should work as before.
>
> The only functional change is the error reporting. When dfu_flush() fails
> the u-boot prompt will exit with error information and dfu-util application
> exits afterwards as well.
>
> Test HW:
> - Odroid XU3 (Exynos5433) - test with large file
> - Trats (Exynos4210) - test for regression - eMMC, raw,
>
> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> Reported-by: Alex Gdalevich <agdalevich@axion-biosystems.com>
> ---
>   common/cmd_dfu.c           | 20 ++++++++++++++++++++
>   drivers/usb/gadget/f_dfu.c | 11 +++--------
>   include/dfu.h              | 25 +++++++++++++++++++++++++
>   3 files changed, 48 insertions(+), 8 deletions(-)

Tested on the dxr2 board with an etamin module containing a 4GiB DDP nand
with a download size from 400MiB ... worked.
(This test is not yet in my nightly builds ...)

Tested-by: Heiko Schocher <hs@denx.de>

bye,
Heiko
BTW:
I used not the "dfu_nand" module, instead I am just developing
a "dfu_mtd" for accessing mtd partitions. So mtd partitions with
underlying mtd concatenated nand devices for example can be programmed
with dfu ... seems first version works  now ...

>
> diff --git a/common/cmd_dfu.c b/common/cmd_dfu.c
> index 6d95ce9..d8aae26 100644
> --- a/common/cmd_dfu.c
> +++ b/common/cmd_dfu.c
> @@ -79,6 +79,26 @@ static int do_dfu(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>   		if (ctrlc())
>   			goto exit;
>
> +		if (dfu_get_defer_flush()) {
> +			/*
> +			 * Call to usb_gadget_handle_interrupts() is necessary
> +			 * to act on ZLP OUT transaction from HOST PC after
> +			 * transmitting the whole file.
> +			 *
> +			 * If this ZLP OUT packet is NAK'ed, the HOST libusb
> +			 * function fails after timeout (by default it is set to
> +			 * 5 seconds). In such situation the dfu-util program
> +			 * exits with error message.
> +			 */
> +			usb_gadget_handle_interrupts(controller_index);
> +			ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
> +			dfu_set_defer_flush(NULL);
> +			if (ret) {
> +				error("Deferred dfu_flush() failed!");
> +				goto exit;
> +			}
> +		}
> +
>   		WATCHDOG_RESET();
>   		usb_gadget_handle_interrupts(controller_index);
>   	}
> diff --git a/drivers/usb/gadget/f_dfu.c b/drivers/usb/gadget/f_dfu.c
> index 77a1567..7d88008 100644
> --- a/drivers/usb/gadget/f_dfu.c
> +++ b/drivers/usb/gadget/f_dfu.c
> @@ -44,6 +44,8 @@ struct f_dfu {
>   	unsigned int                    poll_timeout;
>   };
>
> +struct dfu_entity *dfu_defer_flush;
> +
>   typedef int (*dfu_state_fn) (struct f_dfu *,
>   			     const struct usb_ctrlrequest *,
>   			     struct usb_gadget *,
> @@ -167,14 +169,7 @@ static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req)
>   static void dnload_request_flush(struct usb_ep *ep, struct usb_request *req)
>   {
>   	struct f_dfu *f_dfu = req->context;
> -	int ret;
> -
> -	ret = dfu_flush(dfu_get_entity(f_dfu->altsetting), req->buf,
> -			req->length, f_dfu->blk_seq_num);
> -	if (ret) {
> -		f_dfu->dfu_status = DFU_STATUS_errUNKNOWN;
> -		f_dfu->dfu_state = DFU_STATE_dfuERROR;
> -	}
> +	dfu_set_defer_flush(dfu_get_entity(f_dfu->altsetting));
>   }
>
>   static inline int dfu_get_manifest_timeout(struct dfu_entity *dfu)
> diff --git a/include/dfu.h b/include/dfu.h
> index 6118dc2..f39d3f1 100644
> --- a/include/dfu.h
> +++ b/include/dfu.h
> @@ -163,6 +163,31 @@ int dfu_read(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
>   int dfu_write(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
>   int dfu_flush(struct dfu_entity *de, void *buf, int size, int blk_seq_num);
>
> +/*
> + * dfu_defer_flush - pointer to store dfu_entity for deferred flashing.
> + *		     It should be NULL when not used.
> + */
> +extern struct dfu_entity *dfu_defer_flush;
> +/**
> + * dfu_get_defer_flush - get current value of dfu_defer_flush pointer
> + *
> + * @return - value of the dfu_defer_flush pointer
> + */
> +static inline struct dfu_entity *dfu_get_defer_flush(void)
> +{
> +	return dfu_defer_flush;
> +}
> +
> +/**
> + * dfu_set_defer_flush - set the dfu_defer_flush pointer
> + *
> + * @param dfu - pointer to the dfu_entity, which should be written
> + */
> +static inline void dfu_set_defer_flush(struct dfu_entity *dfu)
> +{
> +	dfu_defer_flush = dfu;
> +}
> +
>   /**
>    * dfu_write_from_mem_addr - write data from memory to DFU managed medium
>    *
>

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] [PATCH 1/2] dfu: usb: f_dfu: Set deferred call for dfu_flush() function

[Lukasz Majewski]

Hi Heiko,

> Hello Lukasz,
> 
> Am 28.01.2016 um 17:46 schrieb Lukasz Majewski:
> > This patch fixes situation when one would like to write large file
> > into medium with the file system (fat, ext4, etc).
> > This change sets file size limitation to the DFU internal buffer
> > size.
> >
> > Since u-boot is not supporting interrupts and seek on file systems,
> > it becomes challenging to store large file appropriately.
> >
> > To reproduce this error - create large file (around 26 MiB) and
> > sent it to the target board.
> >
> > Lets examine the flow of USB transactions:
> >
> > 0. DFU uses EP0 with 64B MPS [Max Packet Size]
> >
> > 1. Send file - OUT (PC->target) - dat_26MiB.img is sent with 4096 B
> > transactions
> >
> > 2. Get status - OUT (PC->target) - wait for
> > DFU_STATE_dfuDNLOAD_IDLE (0x05) sent from target board - IN
> > transaction (target->PC)
> >
> > 3. The whole file content is sent to target - OUT (PC->target) with
> > ZLP [Zero Length Packet]
> >
> > Now the interesting part starts:
> >
> > 4. OUT (PC->target) Setup transaction (request to share DFU state)
> >
> > 5. IN (target->PC) - reply the current DFU state
> > 	- In the UDC driver the req->completion (with dfu_flush) is
> > called after successful IN transfer.
> > 	- The dfu_flush() (called from req->completion callback)
> > saves the whole file at once (u-boot doesn't support seek on fs).
> > 	  Such operation takes considerable time. When the file
> > 	  is large - e.g. 26MiB - this time may be more than 5
> > seconds.
> >
> > 6. OUT (PC->target) - ZLP, is send in the same time when dfu_flush()
> >   writes data to eMMC memory.
> >   The dfu-util application has hard coded timeout on USB transaction
> >   completion set to 5 seconds (it uses libusb calls).
> >
> > When the file to store is large (e.g. 26 MiB) the time needed to
> > write it may excess the dfu-util timeout and following error
> > message will be displayed: "unable to read DFU status" on the HOST
> > PC console.
> >
> > This change is supposed to leverage DFU's part responsible for
> > storing files on file systems. Other DFU operations - i.e.
> > raw/partition write to NAND and eMMC should work as before.
> >
> > The only functional change is the error reporting. When dfu_flush()
> > fails the u-boot prompt will exit with error information and
> > dfu-util application exits afterwards as well.
> >
> > Test HW:
> > - Odroid XU3 (Exynos5433) - test with large file
> > - Trats (Exynos4210) - test for regression - eMMC, raw,
> >
> > Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> > Reported-by: Alex Gdalevich <agdalevich@axion-biosystems.com>
> > ---
> >   common/cmd_dfu.c           | 20 ++++++++++++++++++++
> >   drivers/usb/gadget/f_dfu.c | 11 +++--------
> >   include/dfu.h              | 25 +++++++++++++++++++++++++
> >   3 files changed, 48 insertions(+), 8 deletions(-)
> 
> Tested on the dxr2 board with an etamin module containing a 4GiB DDP
> nand with a download size from 400MiB ... worked.
> (This test is not yet in my nightly builds ...)
> 
> Tested-by: Heiko Schocher <hs@denx.de>

Thanks for testing!

> 
> bye,
> Heiko
> BTW:
> I used not the "dfu_nand" module, instead I am just developing
> a "dfu_mtd" for accessing mtd partitions. So mtd partitions with
> underlying mtd concatenated nand devices for example can be programmed
> with dfu ... seems first version works  now ...

Very nice to hear. I'm looking forward for your patches for review.

BTW. I do plan to setup tbot for my private Beagle Bone Black in the
weekend.

> 
> >
> > diff --git a/common/cmd_dfu.c b/common/cmd_dfu.c
> > index 6d95ce9..d8aae26 100644
> > --- a/common/cmd_dfu.c
> > +++ b/common/cmd_dfu.c
> > @@ -79,6 +79,26 @@ static int do_dfu(cmd_tbl_t *cmdtp, int flag,
> > int argc, char * const argv[]) if (ctrlc())
> >   			goto exit;
> >
> > +		if (dfu_get_defer_flush()) {
> > +			/*
> > +			 * Call to usb_gadget_handle_interrupts()
> > is necessary
> > +			 * to act on ZLP OUT transaction from HOST
> > PC after
> > +			 * transmitting the whole file.
> > +			 *
> > +			 * If this ZLP OUT packet is NAK'ed, the
> > HOST libusb
> > +			 * function fails after timeout (by
> > default it is set to
> > +			 * 5 seconds). In such situation the
> > dfu-util program
> > +			 * exits with error message.
> > +			 */
> > +
> > usb_gadget_handle_interrupts(controller_index);
> > +			ret = dfu_flush(dfu_get_defer_flush(),
> > NULL, 0, 0);
> > +			dfu_set_defer_flush(NULL);
> > +			if (ret) {
> > +				error("Deferred dfu_flush()
> > failed!");
> > +				goto exit;
> > +			}
> > +		}
> > +
> >   		WATCHDOG_RESET();
> >   		usb_gadget_handle_interrupts(controller_index);
> >   	}
> > diff --git a/drivers/usb/gadget/f_dfu.c b/drivers/usb/gadget/f_dfu.c
> > index 77a1567..7d88008 100644
> > --- a/drivers/usb/gadget/f_dfu.c
> > +++ b/drivers/usb/gadget/f_dfu.c
> > @@ -44,6 +44,8 @@ struct f_dfu {
> >   	unsigned int                    poll_timeout;
> >   };
> >
> > +struct dfu_entity *dfu_defer_flush;
> > +
> >   typedef int (*dfu_state_fn) (struct f_dfu *,
> >   			     const struct usb_ctrlrequest *,
> >   			     struct usb_gadget *,
> > @@ -167,14 +169,7 @@ static void dnload_request_complete(struct
> > usb_ep *ep, struct usb_request *req) static void
> > dnload_request_flush(struct usb_ep *ep, struct usb_request *req) {
> >   	struct f_dfu *f_dfu = req->context;
> > -	int ret;
> > -
> > -	ret = dfu_flush(dfu_get_entity(f_dfu->altsetting),
> > req->buf,
> > -			req->length, f_dfu->blk_seq_num);
> > -	if (ret) {
> > -		f_dfu->dfu_status = DFU_STATUS_errUNKNOWN;
> > -		f_dfu->dfu_state = DFU_STATE_dfuERROR;
> > -	}
> > +	dfu_set_defer_flush(dfu_get_entity(f_dfu->altsetting));
> >   }
> >
> >   static inline int dfu_get_manifest_timeout(struct dfu_entity *dfu)
> > diff --git a/include/dfu.h b/include/dfu.h
> > index 6118dc2..f39d3f1 100644
> > --- a/include/dfu.h
> > +++ b/include/dfu.h
> > @@ -163,6 +163,31 @@ int dfu_read(struct dfu_entity *de, void *buf,
> > int size, int blk_seq_num); int dfu_write(struct dfu_entity *de,
> > void *buf, int size, int blk_seq_num); int dfu_flush(struct
> > dfu_entity *de, void *buf, int size, int blk_seq_num);
> >
> > +/*
> > + * dfu_defer_flush - pointer to store dfu_entity for deferred
> > flashing.
> > + *		     It should be NULL when not used.
> > + */
> > +extern struct dfu_entity *dfu_defer_flush;
> > +/**
> > + * dfu_get_defer_flush - get current value of dfu_defer_flush
> > pointer
> > + *
> > + * @return - value of the dfu_defer_flush pointer
> > + */
> > +static inline struct dfu_entity *dfu_get_defer_flush(void)
> > +{
> > +	return dfu_defer_flush;
> > +}
> > +
> > +/**
> > + * dfu_set_defer_flush - set the dfu_defer_flush pointer
> > + *
> > + * @param dfu - pointer to the dfu_entity, which should be written
> > + */
> > +static inline void dfu_set_defer_flush(struct dfu_entity *dfu)
> > +{
> > +	dfu_defer_flush = dfu;
> > +}
> > +
> >   /**
> >    * dfu_write_from_mem_addr - write data from memory to DFU
> > managed medium *
> >
> 



-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group