mvebu: a38x: Force receiver detected on PCIe lanes

Some QCA988x based modules presence is not detected by the SERDES lanes,
so force this detection which will trigger the LTSSM state machine to
negotiate link.

An example of such a card is WLE900VX.

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Tested-by: Chris Packham <judge.packham@gmail.com>
Tested-by: Mario Six <mario.six@gdsys.cc>
Signed-off-by: Stefan Roese <sr@denx.de>

arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c

@@ -597,6 +597,8 @@ struct op_params pex_electrical_config_serdes_rev2_params[] = {
 	{LANE_CFG4_REG, 0x800, 0x8, {0x8}, 0, 0},
 	/* tximpcal_th and rximpcal_th */
 	{VTHIMPCAL_CTRL_REG, 0x800, 0xff00, {0x3000}, 0, 0},
+	/* Force receiver detected */
+	{LANE_CFG0_REG, 0x800, 0x8000, {0x8000}, 0, 0},
 };
 
 /* PEX - configuration seq for REF_CLOCK_25MHz */

arch/arm/mach-mvebu/serdes/a38x/sys_env_lib.h

@@ -71,6 +71,7 @@
 #define RX_REG3				0xa0188
 #define PCIE_REG1			0xa0288
 #define PCIE_REG3			0xa0290
+#define LANE_CFG0_REG			0xa0600
 #define LANE_CFG1_REG			0xa0604
 #define LANE_CFG4_REG			0xa0620
 #define LANE_CFG5_REG			0xa0624