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xhci: Fix mult base in endpoint bandwidth info.

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The "Mult" bits in the SuperSpeed Endpoint Companion Descriptor are
zero-based, and the xHCI host controller wants them to be zero-based in
the input context.  However, for the bandwidth math, we want them to be
one-based.  Fix this.

Fix the documentation about the endpoint bandwidth mult variable in the
xhci.h file, which says it is zero-based.  Also fix the documentation
about num_packets, which is also one-based, not zero-based.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sarah Sharp 2011-09-13 16:41:12 -07:00 committed by Greg Kroah-Hartman
parent 75d7cf72ab
commit 170c026347
2 changed files with 7 additions and 5 deletions
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9
drivers/usb/host/xhci-mem.c
View file

@ -1473,11 +1473,12 @@ void xhci_update_bw_info(struct xhci_hcd *xhci,
/* Added or changed endpoint */
bw_info->ep_interval = CTX_TO_EP_INTERVAL(
le32_to_cpu(ep_ctx->ep_info));
bw_info->mult = CTX_TO_EP_MULT(
le32_to_cpu(ep_ctx->ep_info));
/* Number of packets is zero-based in the input context,
* but we want one-based for the interval table.
/* Number of packets and mult are zero-based in the
* input context, but we want one-based for the
* interval table.
*/
bw_info->mult = CTX_TO_EP_MULT(
le32_to_cpu(ep_ctx->ep_info)) + 1;
bw_info->num_packets = CTX_TO_MAX_BURST(
le32_to_cpu(ep_ctx->ep_info2)) + 1;
bw_info->max_packet_size = MAX_PACKET_DECODED(

3
drivers/usb/host/xhci.h
View file

@ -747,8 +747,9 @@ struct xhci_stream_info {
* (DMI) also limits the total bandwidth (across all domains) that can be used.
*/
struct xhci_bw_info {
/* ep_interval is zero-based */
unsigned int ep_interval;
/* mult and num_packets are zero-based */
/* mult and num_packets are one-based */
unsigned int mult;
unsigned int num_packets;
unsigned int max_packet_size;