phy: qcom: qmp-pcie: Skip PHY reset if already up

Browse source

If the bootloader has already powered up the PCIe PHY, performing a
full reset and waiting for the PHY to come up again adds unnecessary
delay during boot.

Extend the existing skip_init handling by introducing a skip_reset
condition. When skip_init is active and the PHY status indicates that
the PHY is already operational, skip asserting and deasserting the
no-csr reset while still enabling the required resources during
power-on.

This allows reusing the bootloader-initialized PHY state and avoids
redundant PHY reinitialization and PCIe link retraining, which can
add hundred's of milliseconds of delay.

This relies on the assumption that when skip_init is enabled and the
PHY is reported as up, the bootloader has already configured the PHY
correctly and the link is in a usable state.

Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Tested-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
Link: https://patch.msgid.link/20260709-link_retain-v3-1-81a9d187bb61@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

...

This commit is contained in:

Krishna Chaitanya Chundru 2026-07-09 12:05:16 +05:30 • committed by Vinod Koul

parent 2ec9c210c1

commit 910b828b22

1 changed files with 21 additions and 10 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

31

drivers/phy/qualcomm/phy-qcom-qmp-pcie.c

View file