mvebu: cp110: avoid pcie power on/off sequence when called from Linux
In Armada 8K DB boards, PCIe initialization can be executed only once
because PCIe reset performed during chip power on and it cannot be
executed via GPIO later.
This means that power on can be executed only once, when it's called
from the bootloader.
Power on:
Read bit 21 of the mode, it marks if the caller is
the bootloader or the Linux Kernel.
Power off:
Check if the comphy was already configured to PCIe, if yes,
check if the caller is bootloader, if both conditions are true
(PCIe mode and called by Linux) - skip the power-off.
In addition, fix incorrect documentation describing mode fields -
PCIe width is 3 bits, not 2.
NOTE: with this patch, please use LK4.14.76 (LK4.4.120 may not work
with it).
Change-Id: I4b929011f97a0a1869a51ba378687e78b3eca4ff
Signed-off-by: Igal Liberman <igall@marvell.com>
Reviewed-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Reviewed-by: Kostya Porotchkin <kostap@marvell.com>
diff --git a/drivers/marvell/comphy/phy-comphy-cp110.h b/drivers/marvell/comphy/phy-comphy-cp110.h
index 70dbfbf..407909b 100644
--- a/drivers/marvell/comphy/phy-comphy-cp110.h
+++ b/drivers/marvell/comphy/phy-comphy-cp110.h
@@ -82,7 +82,7 @@
int mvebu_cp110_comphy_is_pll_locked(uint64_t comphy_base,
uint8_t comphy_index);
int mvebu_cp110_comphy_power_off(uint64_t comphy_base,
- uint8_t comphy_index);
+ uint8_t comphy_index, uint64_t comphy_mode);
int mvebu_cp110_comphy_power_on(uint64_t comphy_base,
uint8_t comphy_index, uint64_t comphy_mode);
int mvebu_cp110_comphy_xfi_rx_training(uint64_t comphy_base,