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MFp4:

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USB CORE: busdma improvement

      For single segment allocations the boundary field
      of the BUSDMA tag should be zero. Currently all
      single segment allocations are less than or equal
      to 4096 bytes, so the limit does not kick in. If
      any single segment USB allocations would be greater
      than 4K, then it would be a problem.

Approved by:	re (kensmith)
Obtained from:	HPS
This commit is contained in:
Marcel Moolenaar 2009-07-12 16:46:43 +00:00
parent 77822acff7
commit 58f6d27320
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=195639
1 changed files with 2 additions and 1 deletions
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3
sys/dev/usb/usb_busdma.c
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@ -359,7 +359,8 @@ usb_dma_tag_create(struct usb_dma_tag *udt,
if (bus_dma_tag_create
( /* parent */ udt->tag_parent->tag,
/* alignment */ align,
/* boundary */ USB_PAGE_SIZE,
/* boundary */ (align == 1) ?
USB_PAGE_SIZE : 0,
/* lowaddr */ (2ULL << (udt->tag_parent->dma_bits - 1)) - 1,
/* highaddr */ BUS_SPACE_MAXADDR,
/* filter */ NULL,