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usb:hsotg:samsung: Cable disconnection recovery code

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This code allows Samsung SoC's to recover its state when
device is disconnected and connected during transfer.

It is necessary, in such a scenario, to reinitialize the USB core
to assure correct initial state of the driver.
This operation is needed since the disconnect interrupt is only
available at HOST mode, which is not supported by this driver.

A simple mechanism with jiffies has been used to perform core reset
only once.

Tested with:
- DFU gadget (various size of the sent data - also packet = MPS)
- Ethernet gadget (CDC and RNDIS)
- Multi Function Gadget (g_multi)

HW:
- Samsung's C210 Universal rev.0

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Lukasz Majewski 2012-05-04 14:17:08 +02:00 committed by Felipe Balbi
parent 5e891342fd
commit 12a1f4dc0d
1 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/usb/gadget/s3c-hsotg.c
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@ -148,6 +148,7 @@ struct s3c_hsotg_ep {
* @ctrl_buff: Buffer for EP0 control requests.
* @ctrl_req: Request for EP0 control packets.
* @setup: NAK management for EP0 SETUP
* @last_rst: Time of last reset
* @eps: The endpoints being supplied to the gadget framework
*/
struct s3c_hsotg {
@ -175,6 +176,7 @@ struct s3c_hsotg {
struct usb_gadget gadget;
unsigned int setup;
unsigned long last_rst;
struct s3c_hsotg_ep eps[];
};
@ -2377,23 +2379,26 @@ irq_retry:
}
if (gintsts & S3C_GINTSTS_USBRst) {
u32 usb_status = readl(hsotg->regs + S3C_GOTGCTL);
dev_info(hsotg->dev, "%s: USBRst\n", __func__);
dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n",
readl(hsotg->regs + S3C_GNPTXSTS));
writel(S3C_GINTSTS_USBRst, hsotg->regs + S3C_GINTSTS);
kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true);
if (usb_status & S3C_GOTGCTL_BSESVLD) {
if (time_after(jiffies, hsotg->last_rst +
msecs_to_jiffies(200))) {
/* it seems after a reset we can end up with a situation
* where the TXFIFO still has data in it... the docs
* suggest resetting all the fifos, so use the init_fifo
* code to relayout and flush the fifos.
*/
kill_all_requests(hsotg, &hsotg->eps[0],
-ECONNRESET, true);
s3c_hsotg_init_fifo(hsotg);
s3c_hsotg_enqueue_setup(hsotg);
s3c_hsotg_core_init(hsotg);
hsotg->last_rst = jiffies;
}
}
}
/* check both FIFOs */
@ -2436,6 +2441,7 @@ irq_retry:
writel(S3C_GINTSTS_USBSusp, hsotg->regs + S3C_GINTSTS);
call_gadget(hsotg, suspend);
s3c_hsotg_disconnect(hsotg);
}
if (gintsts & S3C_GINTSTS_WkUpInt) {
@ -2448,6 +2454,8 @@ irq_retry:
if (gintsts & S3C_GINTSTS_ErlySusp) {
dev_dbg(hsotg->dev, "S3C_GINTSTS_ErlySusp\n");
writel(S3C_GINTSTS_ErlySusp, hsotg->regs + S3C_GINTSTS);
s3c_hsotg_disconnect(hsotg);
}
/* these next two seem to crop-up occasionally causing the core
@ -2823,7 +2831,7 @@ static int s3c_hsotg_start(struct usb_gadget_driver *driver,
}
s3c_hsotg_core_init(hsotg);
hsotg->last_rst = jiffies;
dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
return 0;