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fsl/usb: Unused endpoint failure for USB gadget 

Though USB controller works without this most of the time, an issue was faced
where USB was configured as printer device and it was dropping first
packet(64 bytes) in full speed mode due to DATA PID mismatch.
The problem gets resolved once unused endpoints are configured as bulk.
As per P1020 RM (Table17-31, bits 19-18, bits 3-2) "When only one endpoint
(RX or TX, but not both) of an endpoint pair is used, the unused endpoint
should be configured as a bulk type endpoint." So according to the RM,
this patch is initializing TX and RX endpoints as bulk type

Signed-off-by: Suchit Lepcha <Suchit.Lepcha@freescale.com>
Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ramneek Mehresh 2011-05-04 19:41:55 +05:30 committed by Greg Kroah-Hartman
parent 69248d4281
commit ea437f3923
1 changed files with 21 additions and 6 deletions
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27
drivers/usb/gadget/fsl_udc_core.c
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@ -1,5 +1,6 @@
/*
* Copyright (C) 2004-2007 Freescale Semicondutor, Inc. All rights reserved.
* Copyright (C) 2004-2007,2011 Freescale Semiconductor, Inc.
* All rights reserved.
*
* Author: Li Yang <leoli@freescale.com>
* Jiang Bo <tanya.jiang@freescale.com>
@ -230,7 +231,8 @@ static void nuke(struct fsl_ep *ep, int status)
static int dr_controller_setup(struct fsl_udc *udc)
{
unsigned int tmp, portctrl;
unsigned int tmp, portctrl, ep_num;
unsigned int max_no_of_ep;
#ifndef CONFIG_ARCH_MXC
unsigned int ctrl;
#endif
@ -298,6 +300,14 @@ static int dr_controller_setup(struct fsl_udc *udc)
udc->ep_qh, (int)tmp,
fsl_readl(&dr_regs->endpointlistaddr));
max_no_of_ep = (0x0000001F & fsl_readl(&dr_regs->dccparams));
for (ep_num = 1; ep_num < max_no_of_ep; ep_num++) {
tmp = fsl_readl(&dr_regs->endptctrl[ep_num]);
tmp &= ~(EPCTRL_TX_TYPE | EPCTRL_RX_TYPE);
tmp |= (EPCTRL_EP_TYPE_BULK << EPCTRL_TX_EP_TYPE_SHIFT)
| (EPCTRL_EP_TYPE_BULK << EPCTRL_RX_EP_TYPE_SHIFT);
fsl_writel(tmp, &dr_regs->endptctrl[ep_num]);
}
/* Config control enable i/o output, cpu endian register */
#ifndef CONFIG_ARCH_MXC
if (udc->pdata->have_sysif_regs) {
@ -391,12 +401,14 @@ static void dr_ep_setup(unsigned char ep_num, unsigned char dir,
if (ep_num)
tmp_epctrl |= EPCTRL_TX_DATA_TOGGLE_RST;
tmp_epctrl |= EPCTRL_TX_ENABLE;
tmp_epctrl &= ~EPCTRL_TX_TYPE;
tmp_epctrl |= ((unsigned int)(ep_type)
<< EPCTRL_TX_EP_TYPE_SHIFT);
} else {
if (ep_num)
tmp_epctrl |= EPCTRL_RX_DATA_TOGGLE_RST;
tmp_epctrl |= EPCTRL_RX_ENABLE;
tmp_epctrl &= ~EPCTRL_RX_TYPE;
tmp_epctrl |= ((unsigned int)(ep_type)
<< EPCTRL_RX_EP_TYPE_SHIFT);
}
@ -619,10 +631,13 @@ static int fsl_ep_disable(struct usb_ep *_ep)
/* disable ep on controller */
ep_num = ep_index(ep);
epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);
if (ep_is_in(ep))
epctrl &= ~EPCTRL_TX_ENABLE;
else
epctrl &= ~EPCTRL_RX_ENABLE;
if (ep_is_in(ep)) {
epctrl &= ~(EPCTRL_TX_ENABLE | EPCTRL_TX_TYPE);
epctrl |= EPCTRL_EP_TYPE_BULK << EPCTRL_TX_EP_TYPE_SHIFT;
} else {
epctrl &= ~(EPCTRL_RX_ENABLE | EPCTRL_TX_TYPE);
epctrl |= EPCTRL_EP_TYPE_BULK << EPCTRL_RX_EP_TYPE_SHIFT;
}
fsl_writel(epctrl, &dr_regs->endptctrl[ep_num]);
udc = (struct fsl_udc *)ep->udc;