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usb: xhci-mtk: relax TT periodic bandwidth allocation

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Currently uses the worst case byte budgets on FS/LS bus bandwidth,
for example, for an isochronos IN endpoint with 192 bytes budget, it
will consume the whole 5 uframes(188 * 5) while the actual FS bus
budget should be just 192 bytes. It cause that many usb audio headsets
with 3 interfaces (audio input, audio output, and HID) cannot be
configured.
To improve it, changes to use "approximate" best case budget for FS/LS
bandwidth management. For the same endpoint from the above example,
the approximate best case budget is now reduced to (188 * 2) bytes.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20220819080556.32215-1-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2022-08-19 16:05:55 +08:00 committed by Greg Kroah-Hartman
parent c1e5c2f0cb
commit 8b13ea0511
1 changed files with 2 additions and 9 deletions
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11
drivers/usb/host/xhci-mtk-sch.c
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@ -425,7 +425,6 @@ static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
static int check_sch_tt(struct mu3h_sch_ep_info *sch_ep, u32 offset)
{
u32 extra_cs_count;
u32 start_ss, last_ss;
u32 start_cs, last_cs;
@ -461,18 +460,12 @@ static int check_sch_tt(struct mu3h_sch_ep_info *sch_ep, u32 offset)
if (last_cs > 7)
return -ESCH_CS_OVERFLOW;
if (sch_ep->ep_type == ISOC_IN_EP)
extra_cs_count = (last_cs == 7) ? 1 : 2;
else /* ep_type : INTR IN / INTR OUT */
extra_cs_count = 1;
cs_count += extra_cs_count;
if (cs_count > 7)
cs_count = 7; /* HW limit */
sch_ep->cs_count = cs_count;
/* one for ss, the other for idle */
sch_ep->num_budget_microframes = cs_count + 2;
/* ss, idle are ignored */
sch_ep->num_budget_microframes = cs_count;
/*
* if interval=1, maxp >752, num_budge_micoframe is larger