Programmed bits of register RP_VEND_XP_PAD_PWRDN are defined as follows,
L1(bit[0]):
This bit, when set, causes the analog pads to power down when we're in L1.
When clear, the LTSSM still enters L1 as required, but the analog pads
are left at full power.
DYNAMIC(bit[1]):
This bit, when set, causes unused analog pads to power down after
"Dynamic Link Width Re-negotiation" takes place. When clear, all analog
pads remain powered up, even those that are no longer being used after
"Dynamic Link Width Re-negotiation" down-sizes the link.
DISABLED(bit[2]):
This bit, when set, causes the analog pads to power down when we're in the
DISABLED_DOWN state. When clear, the LTSSM still enters DISBLED_DOWN as
required, but the analog pads are left at full power.
L1_CLKREQ(bit[15]):
This bit, when set, causes the analog pads to power down to
SLEEP_MODE_L1_REQ when clkreq signal is deasserted in L1.
(NV_PROJ__PCIE2_RP_VEND_XP_PAD_PWRDN_L1 needs to be set in order to power
down pad in L1.) Also, when clkreq is asserted in L1, ltssm will exit L1
immediately. When clear, the clkreq signal doesn't affect the power
management.
SLEEP_MODE_L1(bits[4:3]):
It defines the 2-bit sleep-mode coding in the pad when LTSSM is in the L1
state or DISABLED state.
SLEEP_MODE_DYNAMIC(bits[6:5]):
It defines the 2-bit sleep-mode coding in the pad when the lane shut down
due to dynamic link downsizing.
SLEEP_MODE_L1_CLKREQ(bits[17:16]):
It defines the 2-bit sleep-mode coding when clkreq is deasserted in L1.
The 2-bit sleep-mode encoding is defined as:
- L0 (0x0): Normal power-up mode
- L1 (0x1): L1 power-down mode; Tx common mode on, Rx e-idle detect on
- L1P (0x2): L1 power-down mode; Tx common mode off, Rx e-idle detect on
- L1PP (0x3): L1 power-down mode; Tx common mode off, Rx e-idle detect off
bug 200420606
Change-Id: I74aa9c1460d882084b1ecccb9c0168dd667c9d84
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1786547
(cherry picked from commit d7899c186f89ecf503812003b743adbae07c4cbe)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-5.9/+/2407873
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Manikanta Maddireddy
d936e3daaf