xhci: dbc: poll at different rate depending on data transfer activity

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[ Upstream commit fb18e5bb96 ]

DbC driver starts polling for events immediately when DbC is enabled.
The current polling interval is 1ms, which keeps the CPU busy, impacting
power management even when there are no active data transfers.

Solve this by polling at a slower rate, with a 64ms interval as default
until a transfer request is queued, or if there are still are pending
unhandled transfers at event completion.

Tested-by: Uday M Bhat <uday.m.bhat@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240229141438.619372-9-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: f3d12ec847 ("xhci: dbc: fix bogus 1024 byte prefix if ttyDBC read races with stall event")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Mathias Nyman 2025-10-27 14:42:48 -04:00 • committed by Greg Kroah-Hartman

parent 902f900b46

commit d596d39e16

2 changed files with 13 additions and 2 deletions

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13

drivers/usb/host/xhci-dbgcap.c

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2

drivers/usb/host/xhci-dbgcap.h

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