Re: [PATCH v3 1/2] PCI: dwc: Implement general suspend/resume functionality for L2/L3 transitions

On Fri, May 12, 2023 at 02:47:46PM +0000, Frank Li wrote:

quoted

Introduced helper function dw_pcie_get_ltssm to retrieve
SMLH_LTSS_STATE.
Added API pme_turn_off and exit_from_l2 for managing L2/L3 state
transitions.

Typical L2 entry workflow:

1. Transmit PME turn off signal to PCI devices.
2. Await link entering L2_IDLE state.
3. Transition Root complex to D3 state.

Typical L2 exit workflow:

1. Transition Root complex to D0 state.
2. Issue exit from L2 command.
3. Reinitialize PCI host.
4. Wait for link to become active.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
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quoted

Change from v2 to v3:
- Basic rewrite whole patch according rob herry suggestion.
  put common function into dwc, so more soc can share the same logic.