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USB: musb: host side diagnostics tweaks 

Random host-side MUSB updates, mostly relating to better diagnostics:

 + Improve diagnostics on host side:
    - tx flush fifo:
       * Avoid hundreds of duplicate TX FIFONOTEMPTY messages
       * make "Can't flush TX fifo" a warning, and say which endpoint
    - giveback:
       * use correct status code
       * show completion function name not just URB pointer
    - Fix annoying "1 bytes" (should be "1 byte")

 + Be more consistent about failing init of unusable fifo_mode

It's not clear why that "can't flush TX fifo" message appears, though
it might relate to disconnection; I see it not infrequently

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
David Brownell 2008-11-24 13:06:50 +02:00 committed by Greg Kroah-Hartman
parent 71783e0def
commit bb1c9ef1b4
2 changed files with 15 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/usb/musb/musb_core.c
View File

@ -1212,7 +1212,7 @@ static int __init ep_config_from_table(struct musb *musb)
if (epn >= musb->config->num_eps) {
pr_debug("%s: invalid ep %d\n",
musb_driver_name, epn);
continue;
return -EINVAL;
}
offset = fifo_setup(musb, hw_ep + epn, cfg++, offset);
if (offset < 0) {
@ -1813,7 +1813,6 @@ allocate_instance(struct device *dev,
for (epnum = 0, ep = musb->endpoints;
epnum < musb->config->num_eps;
epnum++, ep++) {
ep->musb = musb;
ep->epnum = epnum;
}

23
drivers/usb/musb/musb_host.c
View File

@ -112,18 +112,21 @@ static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep)
{
void __iomem *epio = ep->regs;
u16 csr;
u16 lastcsr = 0;
int retries = 1000;
csr = musb_readw(epio, MUSB_TXCSR);
while (csr & MUSB_TXCSR_FIFONOTEMPTY) {
DBG(5, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
if (csr != lastcsr)
DBG(3, "Host TX FIFONOTEMPTY csr: %02x\n", csr);
lastcsr = csr;
csr |= MUSB_TXCSR_FLUSHFIFO;
musb_writew(epio, MUSB_TXCSR, csr);
csr = musb_readw(epio, MUSB_TXCSR);
if (retries-- < 1) {
ERR("Could not flush host TX fifo: csr: %04x\n", csr);
if (WARN(retries-- < 1,
"Could not flush host TX%d fifo: csr: %04x\n",
ep->epnum, csr))
return;
}
mdelay(1);
}
}
@ -268,7 +271,7 @@ __musb_giveback(struct musb *musb, struct urb *urb, int status)
__releases(musb->lock)
__acquires(musb->lock)
{
DBG(({ int level; switch (urb->status) {
DBG(({ int level; switch (status) {
case 0:
level = 4;
break;
@ -283,8 +286,8 @@ __acquires(musb->lock)
level = 2;
break;
}; level; }),
"complete %p (%d), dev%d ep%d%s, %d/%d\n",
urb, urb->status,
"complete %p %pF (%d), dev%d ep%d%s, %d/%d\n",
urb, urb->complete, status,
usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
@ -988,8 +991,10 @@ static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb)
if (fifo_count) {
fifo_dest = (u8 *) (urb->transfer_buffer
+ urb->actual_length);
DBG(3, "Sending %d bytes to %p\n",
fifo_count, fifo_dest);
DBG(3, "Sending %d byte%s to ep0 fifo %p\n",
fifo_count,
(fifo_count == 1) ? "" : "s",
fifo_dest);
musb_write_fifo(hw_ep, fifo_count, fifo_dest);
urb->actual_length += fifo_count;