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usb: dwc2: Add SPLIT INTERRUPT transaction support

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CSPLITs for INTERRUPT transactions have to be scheduled in each microframe
following the SSPLIT. INTERRUPT transfers are executed in the next even/
odd microframe depending on the HCCHAR_ODDFRM flag.

As there are no handshakes for INTERRUPT SSPLITs the SSPLIT may have
failed (transport error) without the error being detected by the host
driver. If the last CSPLIT is not received within 4 microframes after the
SSPLIT there was a transaction error and the complete transaction has
to be restarted.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
This commit is contained in:
Stefan Brüns 2016-01-17 04:09:56 +01:00 committed by Marek Vasut
parent b54e447052
commit d2ff51b372
2 changed files with 24 additions and 5 deletions
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28
drivers/usb/host/dwc2.c
View File

@ -776,7 +776,7 @@ static int dwc2_eptype[] = {
static int transfer_chunk(struct dwc2_hc_regs *hc_regs, void *aligned_buffer,
int *pid, int in, void *buffer, int num_packets,
int xfer_len, int *actual_len)
int xfer_len, int *actual_len, int odd_frame)
{
int ret = 0;
uint32_t sub;
@ -804,8 +804,10 @@ static int transfer_chunk(struct dwc2_hc_regs *hc_regs, void *aligned_buffer,
/* Set host channel enable after all other setup is complete. */
clrsetbits_le32(&hc_regs->hcchar, DWC2_HCCHAR_MULTICNT_MASK |
DWC2_HCCHAR_CHEN | DWC2_HCCHAR_CHDIS,
DWC2_HCCHAR_CHEN | DWC2_HCCHAR_CHDIS |
DWC2_HCCHAR_ODDFRM,
(1 << DWC2_HCCHAR_MULTICNT_OFFSET) |
(odd_frame << DWC2_HCCHAR_ODDFRM_OFFSET) |
DWC2_HCCHAR_CHEN);
ret = wait_for_chhltd(hc_regs, &sub, pid);
@ -831,6 +833,7 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
{
struct dwc2_core_regs *regs = priv->regs;
struct dwc2_hc_regs *hc_regs = &regs->hc_regs[DWC2_HC_CHANNEL];
struct dwc2_host_regs *host_regs = &regs->host_regs;
int devnum = usb_pipedevice(pipe);
int ep = usb_pipeendpoint(pipe);
int max = usb_maxpacket(dev, pipe);
@ -843,6 +846,7 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
uint32_t num_packets;
int stop_transfer = 0;
uint32_t max_xfer_len;
int ssplit_frame_num = 0;
debug("%s: msg: pipe %lx pid %d in %d len %d\n", __func__, pipe, *pid,
in, len);
@ -881,6 +885,7 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
do {
int actual_len = 0;
uint32_t hcint;
int odd_frame = 0;
xfer_len = len - done;
if (xfer_len > max_xfer_len)
@ -895,19 +900,32 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
else if (do_split)
clrbits_le32(&hc_regs->hcsplt, DWC2_HCSPLT_COMPSPLT);
if (eptype == DWC2_HCCHAR_EPTYPE_INTR) {
int uframe_num = readl(&host_regs->hfnum);
if (!(uframe_num & 0x1))
odd_frame = 1;
}
ret = transfer_chunk(hc_regs, priv->aligned_buffer, pid,
in, (char *)buffer + done, num_packets,
xfer_len, &actual_len);
xfer_len, &actual_len, odd_frame);
hcint = readl(&hc_regs->hcint);
if (complete_split) {
stop_transfer = 0;
if (hcint & DWC2_HCINT_NYET)
if (hcint & DWC2_HCINT_NYET) {
ret = 0;
else
int frame_num = DWC2_HFNUM_MAX_FRNUM &
readl(&host_regs->hfnum);
if (((frame_num - ssplit_frame_num) &
DWC2_HFNUM_MAX_FRNUM) > 4)
ret = -EAGAIN;
} else
complete_split = 0;
} else if (do_split) {
if (hcint & DWC2_HCINT_ACK) {
ssplit_frame_num = DWC2_HFNUM_MAX_FRNUM &
readl(&host_regs->hfnum);
ret = 0;
complete_split = 1;
}

1
drivers/usb/host/dwc2.h
View File

@ -500,6 +500,7 @@ struct dwc2_core_regs {
#define DWC2_HFNUM_FRNUM_OFFSET 0
#define DWC2_HFNUM_FRREM_MASK (0xFFFF << 16)
#define DWC2_HFNUM_FRREM_OFFSET 16
#define DWC2_HFNUM_MAX_FRNUM 0x3FFF
#define DWC2_HPTXSTS_PTXFSPCAVAIL_MASK (0xFFFF << 0)
#define DWC2_HPTXSTS_PTXFSPCAVAIL_OFFSET 0
#define DWC2_HPTXSTS_PTXQSPCAVAIL_MASK (0xFF << 16)