qcom-7.2 backport: Use gdsc_synced_poweroff_disable() callback for USB PHY GDSCs on Glymur - #1184
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USB and PCIe GDSCs must remain enabled during system suspend for USB host mode and PCIe non-D3cold use cases. These GDSCs currently use PWRSTS_RET_ON in the GDSC driver, which prevents the gdsc driver from disabling them in hardware after the first enable. Consequently, they remain enabled indefinitely, even after their consumers become inactive, preventing the GDSCs from being powered off when no longer needed. Instead, use the GenPDs synced_poweroff flag to control whether a GDSC is disabled during suspend. USB and PCIe drivers can leave the flag unset when the GDSC must remain enabled, and set it when the GDSC should be powered off. This allows consumer drivers to have more dynamic control over the GDSC power state based on their current use case. The existing gdsc_gx_gdsc() callback also disables the GDSC based on synced_poweroff flag but it polls for GDSC status during disable if synced poweroff flag is set. But few PCIE GDSCs have a VOTABLE flag and should not be polled for status during disable. Hence introduce a new gdsc_synced_poweroff_disable() callback that disables the GDSC based on GenPD synced_poweroff flag but won't poll for status if GDSC has VOTABLE flag. Signed-off-by: Jagadeesh Kona <jagadeesh.kona@oss.qualcomm.com>
Use the gdsc_synced_poweroff_disable() as power_off callback for USB GDSCs on Glymur platform. This allows the GDSCs to be disabled during suspend only when the consumer driver explicitly calls dev_pm_genpd_synced_poweroff() before suspend. Consumer drivers can therefore keep the GDSCs powered on during system suspend by not calling dev_pm_genpd_synced_poweroff() before suspend. Signed-off-by: Jagadeesh Kona <jagadeesh.kona@oss.qualcomm.com>
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This series includes changes to use gdsc_synced_poweroff_disable() callback for gcc_usb_0_phy_gdsc and gcc_usb_1_phy_gdsc on Glymur platform. With this change, these GDSCs get disabled only when USB drivers explicitly invoke dev_pm_genpd_synced_poweroff() before suspend, else GDSCs stay ON during suspend.
This is backport to Glymur qcom-7.2 release branch and mainline line PR: qualcomm-linux/kernel-topics#1917 is under review with QLI exception JIRA: https://jira-dc.qualcomm.com/jira/browse/QLIJIRA-215
BACKPORT: qualcomm-linux/kernel-topics#1917
CRs-fixed: 4689959