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Described in PCIe CEM specification sections 2.2 (PERST# Signal) and
2.2.1 (Initial Power-Up (G3 to S0)). The deassertion of PERST# should be
delayed 100ms (TPVPERL) for the power and clock to become stable.
Instead of asserting PERST# right before PCIe initialization and waiting
for 100ms, which is currently the only function of 'mtk_pcie_pre_init',
so that the extra 100ms delay in ramstage is avoided.
TEST=Build pass and boot up to kernel successfully via SSD on Dojo
board, here is the SSD information in boot log:
== NVME IDENTIFY CONTROLLER DATA ==
PCI VID : 0x15b7
PCI SSVID : 0x15b7
SN : 21517J440114
MN : WDC PC SN530 SDBPTPZ-256G-1006
RAB : 0x4
AERL : 0x7
SQES : 0x66
CQES : 0x44
NN : 0x1
Identified NVMe model WDC PC SN530 SDBPTPZ-256G-1006
BUG=b:178565024
BRANCH=cherry
Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
Change-Id: Id5b9369e6f8599f93415588ea585c952a41c5e7d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62359
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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1. The original algorithm for I2C speed cannot always make the
timing meet I2C specification so a new algorithm is introduced
to calculate the timing parameters more correctly.
2. Some I2C buses should be initialized in a different speed while
the original implementation was fixed at fast mode (400Khz).
So the mtk_i2c_bus_init is now also taking an extra speed
parameter.
There is an equivalent change in kernel side:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/i2c/busses/i2c-mt65xx.c?h=v5.15-rc3&id=be5ce0e97cc7a5c0d2da45d617b7bc567c3d3fa1
BUG=b:189899864
TEST=Test on Tomato, boot pass and timing pass
at 100/300/400/500/800/1000Khz.
Signed-off-by: Daolong Zhu <jg_daolongzhu@mediatek.corp-partner.google.com>
Change-Id: Id25b7bb3a76908a7943b940eb5bee799e80626a0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58053
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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To save the S3 power, USB3_HUB_RST_L is externally pulled up to a
weak resistor so we have to reset the hub via GPIO84 as early
as possible. Otherwise the USB3 hub may be not usable.
BUG=b:199822702
TEST=measure voltage of USB3_HUB_RST_L as 1.8V
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Ie87d631e83ede819ee9f9951dfc6517beae50247
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57663
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Change-Id: I1d6ecdb31eef65d2e96d9251348390aa8598be6c
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/53900
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Change-Id: Iab3549b5c4e7d845ddd284a0df3fb448e11fbdcb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/53899
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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Configure Chromebook specific GPIOs, including EC_AP_INT,
SD_CD, EC_IN_RW, GSC_AP_INT and EN_SPK.
Change-Id: Id553f632412af440d21a3b51e017cb74cc27fd22
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52924
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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TEST=boot to romstage on MT8195 EVB
Change-Id: I356e6b1cba3c078bf99e056b290476c7179e8ccf
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52872
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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