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| author | Joshua Scott <joshua.scott@alliedtelesis.co.nz> | 2020-11-09 10:14:08 +1300 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2020-12-07 07:11:37 +0100 |
| commit | 28f0cbcdd28c03c44d867a6641d642e97d4704a8 (patch) | |
| tree | af3d3cbabdee6cb54506850aea0116b3b2c94dfe | |
| parent | 5115de8d64c9bde382946dfd06eae3496a827239 (diff) | |
| download | u-boot-28f0cbcdd28c03c44d867a6641d642e97d4704a8.zip u-boot-28f0cbcdd28c03c44d867a6641d642e97d4704a8.tar.gz u-boot-28f0cbcdd28c03c44d867a6641d642e97d4704a8.tar.bz2 | |
arm: mvebu: a38x: Configurable USB2 high-speed impedance threshold
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>
Reviewed-by: Stefan Roese <sr@denx.de>
| -rw-r--r-- | arch/arm/mach-mvebu/Kconfig | 6 | ||||
| -rw-r--r-- | arch/arm/mach-mvebu/serdes/a38x/high_speed_env_spec.c | 6 |
2 files changed, 9 insertions, 3 deletions
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig index 0d8e092..72aee8b 100644 --- a/arch/arm/mach-mvebu/Kconfig +++ b/arch/arm/mach-mvebu/Kconfig @@ -30,6 +30,12 @@ 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 + range 0x0 0x7 + 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 2454730..ae2a361 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}, |