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| author | Niklas Neronin <niklas.neronin@linux.intel.com> | 2026-04-02 16:13:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-04-02 15:55:37 +0200 |
| commit | 2a70e5dc0301ad961b198f086a39e2479f6b8933 (patch) | |
| tree | 478781f8917bf6426a45b42ed8b08e122715b029 /tools/perf/scripts/python/bin/stackcollapse-record | |
| parent | 951564d2cabd36fa3ee09d89c61bd33e6b73791b (diff) | |
usb: xhci: optimize resuming from S4 (suspend-to-disk)
On resume from S4 (power loss after suspend/hibernation), the xHCI
driver previously freed, reallocated, and fully reinitialized all
data structures. Most of this is unnecessary because the data is
restored from a saved image; only the xHCI registers lose their values.
This patch optimizes S4 resume by performing only a host controller
reset, which includes:
* Freeing or clearing runtime-created data.
* Rewriting xHCI registers.
Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://patch.msgid.link/20260402131342.2628648-13-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/bin/stackcollapse-record')
0 files changed, 0 insertions, 0 deletions