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It appears the ISP/SAF1761 sometimes is busy when reading the status

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word of the PTD and simply returns a value of zero. Retry a few times
before giving up.

Sponsored by:	DARPA, AFRL
This commit is contained in:
Hans Petter Selasky 2014-05-30 16:44:03 +00:00
parent f1f7034d11
commit 4be86ee126
1 changed files with 21 additions and 19 deletions
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40
sys/dev/usb/controller/saf1761_otg.c
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@ -291,11 +291,23 @@ saf1761_host_channel_free(struct saf1761_otg_softc *sc, struct saf1761_otg_td *t
}
static uint32_t
saf1761_peek_host_memory_le_4(struct saf1761_otg_softc *sc, uint32_t offset)
saf1761_peek_host_status_le_4(struct saf1761_otg_softc *sc, uint32_t offset)
{
SAF1761_WRITE_LE_4(sc, SOTG_MEMORY_REG, offset);
SAF1761_90NS_DELAY(sc); /* read prefetch time is 90ns */
return (SAF1761_READ_LE_4(sc, offset));
uint32_t x = 0;
while (1) {
uint32_t retval;
SAF1761_WRITE_LE_4(sc, SOTG_MEMORY_REG, offset);
SAF1761_90NS_DELAY(sc); /* read prefetch time is 90ns */
retval = SAF1761_READ_LE_4(sc, offset);
if (retval != 0)
return (retval);
if (++x == 8) {
DPRINTF("STAUS is zero at offset 0x%x\n", offset);
break;
}
}
return (0);
}
static void
@ -415,9 +427,7 @@ saf1761_host_setup_tx(struct saf1761_otg_softc *sc, struct saf1761_otg_td *td)
if (td->channel < SOTG_HOST_CHANNEL_MAX) {
pdt_addr = SOTG_PTD(td->channel);
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
if (status == 0)
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
status = saf1761_peek_host_status_le_4(sc, pdt_addr + SOTG_PTD_DW3);
DPRINTFN(5, "STATUS=0x%08x\n", status);
@ -487,9 +497,7 @@ saf1761_host_bulk_data_rx(struct saf1761_otg_softc *sc, struct saf1761_otg_td *t
pdt_addr = SOTG_PTD(td->channel);
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
if (status == 0)
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
status = saf1761_peek_host_status_le_4(sc, pdt_addr + SOTG_PTD_DW3);
DPRINTFN(5, "STATUS=0x%08x\n", status);
@ -591,9 +599,7 @@ saf1761_host_bulk_data_tx(struct saf1761_otg_softc *sc, struct saf1761_otg_td *t
pdt_addr = SOTG_PTD(td->channel);
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
if (status == 0)
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
status = saf1761_peek_host_status_le_4(sc, pdt_addr + SOTG_PTD_DW3);
DPRINTFN(5, "STATUS=0x%08x\n", status);
@ -681,9 +687,7 @@ saf1761_host_intr_data_rx(struct saf1761_otg_softc *sc, struct saf1761_otg_td *t
pdt_addr = SOTG_PTD(td->channel);
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
if (status == 0)
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
status = saf1761_peek_host_status_le_4(sc, pdt_addr + SOTG_PTD_DW3);
DPRINTFN(5, "STATUS=0x%08x\n", status);
@ -788,9 +792,7 @@ saf1761_host_intr_data_tx(struct saf1761_otg_softc *sc, struct saf1761_otg_td *t
pdt_addr = SOTG_PTD(td->channel);
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
if (status == 0)
status = saf1761_peek_host_memory_le_4(sc, pdt_addr + SOTG_PTD_DW3);
status = saf1761_peek_host_status_le_4(sc, pdt_addr + SOTG_PTD_DW3);
DPRINTFN(5, "STATUS=0x%08x\n", status);