| commit | 3f2a1c1223d3ca969b726d0ca982e936c5a42e4b | [log] [tgz] |
|---|---|---|
| author | Guillermo Maturana <maturana@google.com> | Wed Oct 27 14:13:42 2021 -0700 |
| committer | Matute <maturana@google.com> | Tue Nov 02 12:24:13 2021 -0700 |
| tree | 965f8897d0444fc7e6a2e8a62b3e7d1bf122798f | |
| parent | 0d0f7aed6f4dbd1f00c229fc41ce0f999ac18de7 [diff] |
[clkmgr, pwrmgr] Add clock handshaking for usb Since usb clocks can be turned on/off outside of normal low power routines, it creates some corner cases depending on how it is used. This PR fixes [sw, dif pwrmgr smoketest] Deadlock when disabling USB clock in active power #6504 by handshaking usb oscillator disables. Specifically, before the usb oscillator can be disabled, it must first request downstream gating to assert. Only when this is done, can the usb oscillator be turned off. This ensures there is no low power entry / exit confusion. Note this is not the ideal fix, but this is done to minimize the amount of disruption on the overall design and eventually dv. Some changes in DV code are required by the clkmgr change. RTL changes by tjaychen, DV changes by matutem. Signed-off-by: Guillermo Maturana <maturana@google.com>
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