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Code Issues Releases Wiki Activity

USB: Use EHCI control transfer pid macros instead of constant values.

Browse source 
Macros with good names offer better readability. Besides, also move
the definition to ehci.h.

Signed-off-by: Dingyan Li <18500469033@163.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20240309033709.14604-1-18500469033@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dingyan Li 2024-03-09 11:37:09 +08:00 committed by Greg Kroah-Hartman
parent 1f855c5e68
commit 110000b540
3 changed files with 20 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/usb/host/ehci-dbg.c
View file

@ -430,13 +430,13 @@ static void qh_lines(struct ehci_hcd *ehci, struct ehci_qh *qh,
mark = '/';
}
switch ((scratch >> 8) & 0x03) {
case 0:
case PID_CODE_OUT:
type = "out";
break;
case 1:
case PID_CODE_IN:
type = "in";
break;
case 2:
case PID_CODE_SETUP:
type = "setup";
break;
default:
@ -602,10 +602,10 @@ static unsigned output_buf_tds_dir(char *buf, struct ehci_hcd *ehci,
list_for_each_entry(qtd, &qh->qtd_list, qtd_list) {
temp++;
switch ((hc32_to_cpu(ehci, qtd->hw_token) >> 8) & 0x03) {
case 0:
case PID_CODE_OUT:
type = "out";
continue;
case 1:
case PID_CODE_IN:
type = "in";
continue;
}

20
drivers/usb/host/ehci-q.c
View file

@ -27,10 +27,6 @@
/*-------------------------------------------------------------------------*/
/* PID Codes that are used here, from EHCI specification, Table 3-16. */
#define PID_CODE_IN 1
#define PID_CODE_SETUP 2
/* fill a qtd, returning how much of the buffer we were able to queue up */
static unsigned int
@ -230,7 +226,7 @@ static int qtd_copy_status (
/* fs/ls interrupt xfer missed the complete-split */
status = -EPROTO;
} else if (token & QTD_STS_DBE) {
status = (QTD_PID (token) == 1) /* IN ? */
status = (QTD_PID(token) == PID_CODE_IN) /* IN ? */
? -ENOSR /* hc couldn't read data */
: -ECOMM; /* hc couldn't write data */
} else if (token & QTD_STS_XACT) {
@ -606,7 +602,7 @@ qh_urb_transaction (
/* SETUP pid */
qtd_fill(ehci, qtd, urb->setup_dma,
sizeof (struct usb_ctrlrequest),
token | (2 /* "setup" */ << 8), 8);
token | (PID_CODE_SETUP << 8), 8);
/* ... and always at least one more pid */
token ^= QTD_TOGGLE;
@ -620,7 +616,7 @@ qh_urb_transaction (
/* for zero length DATA stages, STATUS is always IN */
if (len == 0)
token |= (1 /* "in" */ << 8);
token |= (PID_CODE_IN << 8);
}
/*
@ -642,7 +638,7 @@ qh_urb_transaction (
}
if (is_input)
token |= (1 /* "in" */ << 8);
token |= (PID_CODE_IN << 8);
/* else it's already initted to "out" pid (0 << 8) */
maxpacket = usb_endpoint_maxp(&urb->ep->desc);
@ -709,7 +705,7 @@ qh_urb_transaction (
if (usb_pipecontrol (urb->pipe)) {
one_more = 1;
token ^= 0x0100; /* "in" <--> "out" */
token ^= (PID_CODE_IN << 8); /* "in" <--> "out" */
token |= QTD_TOGGLE; /* force DATA1 */
} else if (usb_pipeout(urb->pipe)
&& (urb->transfer_flags & URB_ZERO_PACKET)
@ -1203,7 +1199,7 @@ static int ehci_submit_single_step_set_feature(
/* SETUP pid, and interrupt after SETUP completion */
qtd_fill(ehci, qtd, urb->setup_dma,
sizeof(struct usb_ctrlrequest),
QTD_IOC | token | (2 /* "setup" */ << 8), 8);
QTD_IOC | token | (PID_CODE_SETUP << 8), 8);
submit_async(ehci, urb, &qtd_list, GFP_ATOMIC);
return 0; /*Return now; we shall come back after 15 seconds*/
@ -1216,7 +1212,7 @@ static int ehci_submit_single_step_set_feature(
token ^= QTD_TOGGLE; /*We need to start IN with DATA-1 Pid-sequence*/
buf = urb->transfer_dma;
token |= (1 /* "in" */ << 8); /*This is IN stage*/
token |= (PID_CODE_IN << 8); /*This is IN stage*/
maxpacket = usb_endpoint_maxp(&urb->ep->desc);
@ -1229,7 +1225,7 @@ static int ehci_submit_single_step_set_feature(
qtd->hw_alt_next = EHCI_LIST_END(ehci);
/* STATUS stage for GetDesc control request */
token ^= 0x0100; /* "in" <--> "out" */
token ^= (PID_CODE_IN << 8); /* "in" <--> "out" */
token |= QTD_TOGGLE; /* force DATA1 */
qtd_prev = qtd;

8
drivers/usb/host/ehci.h
View file

@ -321,10 +321,16 @@ struct ehci_qtd {
size_t length; /* length of buffer */
} __aligned(32);
/* PID Codes that are used here, from EHCI specification, Table 3-16. */
#define PID_CODE_OUT 0
#define PID_CODE_IN 1
#define PID_CODE_SETUP 2
/* mask NakCnt+T in qh->hw_alt_next */
#define QTD_MASK(ehci) cpu_to_hc32(ehci, ~0x1f)
#define IS_SHORT_READ(token) (QTD_LENGTH(token) != 0 && QTD_PID(token) == 1)
#define IS_SHORT_READ(token) (QTD_LENGTH(token) != 0 && \
QTD_PID(token) == PID_CODE_IN)
/*-------------------------------------------------------------------------*/