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usb: dwc3: ep0: add dwc3_ep0_prepare_one_trb() 

For now this is just a cleanup patch, no functional
changes. We will be using the new function to fix a
bug introduced long ago by commit 0416e494ce
("usb: dwc3: ep0: correct cache sync issue in case
of ep0_bounced") and further worsened by commit
c0bd5456a4 ("usb: dwc3: ep0: handle non maxpacket
aligned transfers > 512")

Cc: <stable@vger.kernel.org>
Reported-by: Janusz Dziedzic <januszx.dziedzic@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-12-20 13:57:32 +02:00
parent efc95b2ca4
commit 7931ec86c1
1 changed files with 16 additions and 10 deletions
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26
drivers/usb/dwc3/ep0.c
View File

@ -39,18 +39,13 @@ static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
struct dwc3_ep *dep, struct dwc3_request *req);
static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
u32 len, u32 type, bool chain)
static void dwc3_ep0_prepare_one_trb(struct dwc3 *dwc, u8 epnum,
dma_addr_t buf_dma, u32 len, u32 type, bool chain)
{
struct dwc3_gadget_ep_cmd_params params;
struct dwc3_trb *trb;
struct dwc3_ep *dep;
int ret;
dep = dwc->eps[epnum];
if (dep->flags & DWC3_EP_BUSY)
return 0;
trb = &dwc->ep0_trb[dep->trb_enqueue];
@ -71,15 +66,26 @@ static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
trb->ctrl |= (DWC3_TRB_CTRL_IOC
| DWC3_TRB_CTRL_LST);
if (chain)
trace_dwc3_prepare_trb(dep, trb);
}
static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
u32 len, u32 type, bool chain)
{
struct dwc3_gadget_ep_cmd_params params;
struct dwc3_ep *dep;
int ret;
dep = dwc->eps[epnum];
if (dep->flags & DWC3_EP_BUSY)
return 0;
dwc3_ep0_prepare_one_trb(dwc, epnum, buf_dma, len, type, chain);
memset(&params, 0, sizeof(params));
params.param0 = upper_32_bits(dwc->ep0_trb_addr);
params.param1 = lower_32_bits(dwc->ep0_trb_addr);
trace_dwc3_prepare_trb(dep, trb);
ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, &params);
if (ret < 0)
return ret;