Now that queue_trb() generates the correct TRB_CYCLE value for all
commands, there is no need for the callers to worry about it.
Remove all the code from xhci_queue_bulk_tx() that remembered
the location of the first TRB and its cycle bit.
Also remove related variables that used to be passed to giveback_first_trb.
There are no references left to ring->cycle_state or TRB_CYCLE
(or 0x1 meaing TRB_CYCLE) in the code that generates TRB.
Signed-off-by: David Laight <david.lai...@aculab.com>
---
drivers/usb/host/xhci-ring.c | 78 +++-----------------------------------------
1 file changed, 5 insertions(+), 73 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index c1ba8ca..0d0bd7f 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2906,12 +2906,8 @@ static void queue_trb(struct xhci_hcd *xhci, struct
xhci_ring *ring,
trb = &ring->enqueue->generic;
- /*
- * Ignore the caller's CYCLE bit.
- * The caller doesn't know whether the real first TRB is
- * actually a LINK (or NOP) TRB.
- */
- field4 = (field4 & ~TRB_CYCLE) | ring->cycle_state;
+ /* Give the controller ownership of all but the first TRB */
+ field4 |= ring->cycle_state;
if (trb == &ring->enqueue_first->generic)
field4 ^= TRB_CYCLE;
@@ -3284,13 +3280,9 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
int num_sgs;
int trb_buff_len, this_sg_len, running_total;
unsigned int total_packet_count;
- bool first_trb;
u64 addr;
bool more_trbs_coming;
- struct xhci_generic_trb *start_trb;
- int start_cycle;
-
ep_ring = xhci_urb_to_transfer_ring(xhci, urb);
if (!ep_ring)
return -EINVAL;
@@ -3309,14 +3301,6 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
urb_priv = urb->hcpriv;
td = urb_priv->td[0];
- /*
- * Don't give the first TRB to the hardware (by toggling the cycle bit)
- * until we've finished creating all the other TRBs. The ring's cycle
- * state may change as we enqueue the other TRBs, so save it too.
- */
- start_trb = &ep_ring->enqueue->generic;
- start_cycle = ep_ring->cycle_state;
-
running_total = 0;
/*
* How much data is in the first TRB?
@@ -3335,21 +3319,12 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
if (trb_buff_len > urb->transfer_buffer_length)
trb_buff_len = urb->transfer_buffer_length;
- first_trb = true;
/* Queue the first TRB, even if it's zero-length */
do {
u32 field = 0;
u32 length_field = 0;
u32 remainder = 0;
- /* Don't change the cycle bit of the first TRB until later */
- if (first_trb) {
- first_trb = false;
- if (start_cycle == 0)
- field |= 0x1;
- } else
- field |= ep_ring->cycle_state;
-
/* Chain all the TRBs together; clear the chain bit in the last
* TRB to indicate it's the last TRB in the chain.
*/
@@ -3435,10 +3410,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
struct urb_priv *urb_priv;
struct xhci_td *td;
int num_trbs;
- struct xhci_generic_trb *start_trb;
- bool first_trb;
bool more_trbs_coming;
- int start_cycle;
u32 field, length_field;
int running_total, trb_buff_len, ret;
@@ -3479,14 +3451,6 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
urb_priv = urb->hcpriv;
td = urb_priv->td[0];
- /*
- * Don't give the first TRB to the hardware (by toggling the cycle bit)
- * until we've finished creating all the other TRBs. The ring's cycle
- * state may change as we enqueue the other TRBs, so save it too.
- */
- start_trb = &ep_ring->enqueue->generic;
- start_cycle = ep_ring->cycle_state;
-
running_total = 0;
total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
usb_endpoint_maxp(&urb->ep->desc));
@@ -3497,21 +3461,11 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
if (trb_buff_len > urb->transfer_buffer_length)
trb_buff_len = urb->transfer_buffer_length;
- first_trb = true;
-
/* Queue the first TRB, even if it's zero-length */
do {
u32 remainder = 0;
field = 0;
- /* Don't change the cycle bit of the first TRB until later */
- if (first_trb) {
- first_trb = false;
- if (start_cycle == 0)
- field |= 0x1;
- } else
- field |= ep_ring->cycle_state;
-
/* Chain all the TRBs together; clear the chain bit in the last
* TRB to indicate it's the last TRB in the chain.
*/
@@ -3573,8 +3527,6 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
int num_trbs;
int ret;
struct usb_ctrlrequest *setup;
- struct xhci_generic_trb *start_trb;
- int start_cycle;
u32 field, length_field;
struct urb_priv *urb_priv;
struct xhci_td *td;
@@ -3608,21 +3560,11 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
urb_priv = urb->hcpriv;
td = urb_priv->td[0];
- /*
- * Don't give the first TRB to the hardware (by toggling the cycle bit)
- * until we've finished creating all the other TRBs. The ring's cycle
- * state may change as we enqueue the other TRBs, so save it too.
- */
- start_trb = &ep_ring->enqueue->generic;
- start_cycle = ep_ring->cycle_state;
-
/* Queue setup TRB - see section 6.4.1.2.1 */
/* FIXME better way to translate setup_packet into two u32 fields? */
setup = (struct usb_ctrlrequest *) urb->setup_packet;
field = 0;
field |= TRB_IDT | TRB_TYPE(TRB_SETUP);
- if (start_cycle == 0)
- field |= 0x1;
/* xHCI 1.0 6.4.1.2.1: Transfer Type field */
if (xhci->hci_version == 0x100) {
@@ -3658,7 +3600,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
lower_32_bits(urb->transfer_dma),
upper_32_bits(urb->transfer_dma),
length_field,
- field | ep_ring->cycle_state);
+ field);
}
/* Save the DMA address of the last TRB in the TD */
@@ -3675,7 +3617,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t
mem_flags,
0,
TRB_INTR_TARGET(0),
/* Event on completion */
- field | TRB_IOC | TRB_TYPE(TRB_STATUS) |
ep_ring->cycle_state);
+ field | TRB_IOC | TRB_TYPE(TRB_STATUS));
giveback_first_trb(xhci, slot_id, ep_index, ep_ring);
return 0;
@@ -3763,9 +3705,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
struct urb_priv *urb_priv;
struct xhci_td *td;
int num_tds, trbs_per_td;
- struct xhci_generic_trb *start_trb;
bool first_trb;
- int start_cycle;
u32 field, length_field;
int running_total, trb_buff_len, td_len, td_remain_len, ret;
u64 start_addr, addr;
@@ -3781,8 +3721,6 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
}
start_addr = (u64) urb->transfer_dma;
- start_trb = &ep_ring->enqueue->generic;
- start_cycle = ep_ring->cycle_state;
urb_priv = urb->hcpriv;
/* Queue the first TRB, even if it's zero-length */
@@ -3827,16 +3765,10 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci,
gfp_t mem_flags,
field |= TRB_TYPE(TRB_ISOC);
/* Assume URB_ISO_ASAP is set */
field |= TRB_SIA;
- if (i == 0) {
- if (start_cycle == 0)
- field |= 0x1;
- } else
- field |= ep_ring->cycle_state;
first_trb = false;
} else {
/* Queue other normal TRBs */
field |= TRB_TYPE(TRB_NORMAL);
- field |= ep_ring->cycle_state;
}
/* Only set interrupt on short packet for IN EPs */
@@ -4007,7 +3939,7 @@ static int queue_command(struct xhci_hcd *xhci, u32
field1, u32 field2,
return ret;
}
queue_trb(xhci, xhci->cmd_ring, false, field1, field2, field3,
- field4 | xhci->cmd_ring->cycle_state);
+ field4);
/* The 'first' TRB might be a LINK TRB... */
giveback_first_trb(xhci, 0, 0, xhci->cmd_ring);
return 0;
--
1.8.1.2
--
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