On 25.06.20 02:48, Chris Packham wrote:
When running USB compliance tests on our Armada-385 hardware platforms
we have seen some eye mask violations. Marvell's internal documentation
says: Based on silicon test results, it is recommended to change the
impedance calibration threshold setting to 0x6 prior to calibration.
Port changes from Marvell's u-boot fork[1] to address this.
[1] -
https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/commit/a6221551
Signed-off-by: Chris Packham
Reviewed-by: Stefan Roese
Thanks,
Stefan
---
.../serdes/a38x/high_speed_env_spec.c | 25 ---
1 file changed, 21 insertions(+), 4 deletions(-)
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 d4480622c89c..2454730e6d86 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
@@ -672,12 +672,29 @@ struct op_params usb2_power_up_params[] = {
{0xc200c, 0x0 /*NA*/, 0x100, {0x100}, 0, 0},
/* Phy0 register 3 - TX Channel control 0 */
{0xc400c, 0x0 /*NA*/, 0x100, {0x100}, 0, 0},
- /* check PLLCAL_DONE is set and IMPCAL_DONE is set */
+ /* Decrease the amplitude of the low speed eye to meet the spec */
+ {0xc000c, 0x0 /*NA*/, 0xf000, {0x1000}, 0, 0},
+ {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},
+ /* 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},
+ {0xc4014, 0x0 /*NA*/, 0xf, {0x8}, 0, 0},
+ /* Check PLLCAL_DONE is set and IMPCAL_DONE is set */
{0xc0008, 0x0 /*NA*/, 0x8080, {0x8080}, 1, 1000},
- /* check REG_SQCAL_DONE is set */
+ /* Check REG_SQCAL_DONE is set */
{0xc0018, 0x0 /*NA*/, 0x8000, {0x8000}, 1, 1000},
- /* check PLL_READY is set */
- {0xc, 0x0 /*NA*/, 0x8000, {0x8000}, 1, 1000}
+ /* Check PLL_READY is set */
+ {0xc, 0x0 /*NA*/, 0x8000, {0x8000}, 1, 1000},
+ /* Start calibrate of high seed impedance */
+ {0xc0008, 0x0 /*NA*/, 0x2000, {0x2000}, 0, 0},
+ {0x0, 0x0 /*NA*/, 0x0, {0x0}, 10, 0},
+ /* De-assert the calibration signal */
+ {0xc0008, 0x0 /*NA*/, 0x2000, {0x0}, 0, 0},
};
/*
Viele Grüße,
Stefan
--
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