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Bump the FTDI receive buffer size to 256 in order to improve throughput.

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This commit is contained in:
phk 2008-12-14 20:05:03 +00:00
parent ecf077f4c4
commit 34e9cedabf
1 changed files with 23 additions and 22 deletions
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45
sys/dev/usb/uftdi.c
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@ -100,7 +100,7 @@ SYSCTL_INT(_hw_usb_uftdi, OID_AUTO, debug, CTLFLAG_RW,
* These are the maximum number of bytes transferred per frame.
* The output buffer size cannot be increased due to the size encoding.
*/
#define UFTDIIBUFSIZE 64
#define UFTDIIBUFSIZE 256
#define UFTDIOBUFSIZE 64
struct uftdi_softc {
@ -458,32 +458,33 @@ uftdi_read(void *vsc, int portno, u_char **ptr, u_int32_t *count)
{
struct uftdi_softc *sc = vsc;
u_char msr, lsr;
unsigned l;
DPRINTFN(15,("uftdi_read: sc=%p, port=%d count=%d\n", sc, portno,
*count));
DPRINTFN(15,("uftdi_read: sc=%p, port=%d count=%d\n",
sc, portno, *count));
while (*count > 0) {
l = *count;
if (l > 64)
l = 64;
msr = FTDI_GET_MSR(*ptr);
lsr = FTDI_GET_LSR(*ptr);
msr = FTDI_GET_MSR(*ptr);
lsr = FTDI_GET_LSR(*ptr);
#ifdef USB_DEBUG
if (*count != 2)
DPRINTFN(10,("uftdi_read: sc=%p, port=%d count=%d data[0]="
"0x%02x\n", sc, portno, *count, (*ptr)[2]));
#endif
if (sc->sc_msr != msr ||
(sc->sc_lsr & FTDI_LSR_MASK) != (lsr & FTDI_LSR_MASK)) {
DPRINTF(("uftdi_read: status change msr=0x%02x(0x%02x) "
"lsr=0x%02x(0x%02x)\n", msr, sc->sc_msr,
lsr, sc->sc_lsr));
sc->sc_msr = msr;
sc->sc_lsr = lsr;
ucom_status_change(&sc->sc_ucom);
}
if (sc->sc_msr != msr ||
(sc->sc_lsr & FTDI_LSR_MASK) != (lsr & FTDI_LSR_MASK)) {
DPRINTF(("uftdi_read: status change msr=0x%02x(0x%02x) "
"lsr=0x%02x(0x%02x)\n", msr, sc->sc_msr,
lsr, sc->sc_lsr));
sc->sc_msr = msr;
sc->sc_lsr = lsr;
ucom_status_change(&sc->sc_ucom);
if (l > 2)
ucomrxchars(&sc->sc_ucom, (*ptr) + 2, l - 2);
*ptr += l;
*count -= l;
}
/* Pick up status and adjust data part. */
*ptr += 2;
*count -= 2;
}
static size_t