Hardware testing of a board using the Armada 385 has shown that an impedance threshold setting of 0x7 performs better in an eye-diagram test than with Marvell's recommended value 0x6.
As other boards may still perform better with Marvell's reccomended value, a configuration option is added with a default value of 0x6.
Signed-off-by: Joshua Scott joshua.scott@alliedtelesis.co.nz Cc: Stefan Roese sr@denx.de.in --- arch/arm/mach-mvebu/Kconfig | 5 +++++ arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c | 6 +++--- 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig index 0d8e0922a2..bec011e584 100644 --- a/arch/arm/mach-mvebu/Kconfig +++ b/arch/arm/mach-mvebu/Kconfig @@ -30,6 +30,11 @@ config ARMADA_38X select ARMADA_32BIT select HAVE_MVEBU_EFUSE
+config ARMADA_38X_HS_IMPEDANCE_THRESH + hex "Armada 38x USB 2.0 High-Speed Impedance Threshold (0x0 - 0x7)" + depends on ARMADA_38X + default 0x6 + config ARMADA_XP bool select ARMADA_32BIT diff --git a/arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c b/arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c index 2454730e6d..ae2a361104 100644 --- a/arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c +++ b/arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c @@ -677,9 +677,9 @@ struct op_params usb2_power_up_params[] = { {0xc200c, 0x0 /*NA*/, 0xf000, {0x1000}, 0, 0}, {0xc400c, 0x0 /*NA*/, 0xf000, {0x1000}, 0, 0}, /* Change the High speed impedance threshold */ - {0xc0008, 0x0 /*NA*/, 0x700, {0x600}, 0, 0}, - {0xc2008, 0x0 /*NA*/, 0x700, {0x600}, 0, 0}, - {0xc4008, 0x0 /*NA*/, 0x700, {0x600}, 0, 0}, + {0xc0008, 0x0 /*NA*/, 0x700, {CONFIG_ARMADA_38X_HS_IMPEDANCE_THRESH << 8}, 0, 0}, + {0xc2008, 0x0 /*NA*/, 0x700, {CONFIG_ARMADA_38X_HS_IMPEDANCE_THRESH << 8}, 0, 0}, + {0xc4008, 0x0 /*NA*/, 0x700, {CONFIG_ARMADA_38X_HS_IMPEDANCE_THRESH << 8}, 0, 0}, /* Change the squelch level of the receiver to meet the receiver electrical measurements (squelch and receiver sensitivity tests) */ {0xc0014, 0x0 /*NA*/, 0xf, {0x8}, 0, 0}, {0xc2014, 0x0 /*NA*/, 0xf, {0x8}, 0, 0},