From d4712010107eab9e6ae897a7912d4407f299eecc Mon Sep 17 00:00:00 2001 From: Martin Roth Date: Fri, 3 Mar 2023 16:38:25 -0700 Subject: mb/google/skyrim: override winterhold PCIe config Winterhold boards populate either NVMe or eMMC, but not both. This means that there is always one link that is unpopulated. The PCIe configuration code takes longer to verify that a link is unpopulated than to just train the link, so this slows down the boot by roughly 80ms vs the case when the device is present. Not training the device at all lowers boot time by another 20ms, for a total of 100ms saved. Looking at the NVMe CLKREQ signal before initializing the ports allows us to identify which device is populated and only initialize that device. BUG=b:271569628 TEST=Boot Whiterun and eMMC or NVMe correctly work, boot time is lower. BRANCH=skyrim Signed-off-by: Martin Roth Change-Id: I0b87f5e968cd1c87e62a1c0fbdee1fc0723f655d Reviewed-on: https://review.coreboot.org/c/coreboot/+/73441 Tested-by: build bot (Jenkins) Reviewed-by: Matt DeVillier --- .../google/skyrim/variants/baseboard/gpio.c | 2 + .../google/skyrim/variants/winterhold/Makefile.inc | 3 + .../skyrim/variants/winterhold/port_descriptors.c | 97 ++++++++++++++++++++++ 3 files changed, 102 insertions(+) create mode 100644 src/mainboard/google/skyrim/variants/winterhold/port_descriptors.c (limited to 'src/mainboard/google/skyrim/variants') diff --git a/src/mainboard/google/skyrim/variants/baseboard/gpio.c b/src/mainboard/google/skyrim/variants/baseboard/gpio.c index cef3338ccc..932acaaee6 100644 --- a/src/mainboard/google/skyrim/variants/baseboard/gpio.c +++ b/src/mainboard/google/skyrim/variants/baseboard/gpio.c @@ -201,6 +201,8 @@ static const struct soc_amd_gpio romstage_gpio_table[] = { PAD_NFO(GPIO_27, PCIE_RST1_L, HIGH), /* SSD_AUX_RESET_L */ PAD_GPO(GPIO_6, HIGH), + /* CLK_REQ0_L / SSD */ + PAD_NF(GPIO_92, CLK_REQ0_L, PULL_NONE), /* Enable touchscreen, hold in reset */ /* EN_PP3300_TCHSCR */ PAD_GPO(GPIO_131, HIGH), diff --git a/src/mainboard/google/skyrim/variants/winterhold/Makefile.inc b/src/mainboard/google/skyrim/variants/winterhold/Makefile.inc index db72b152a7..26b1ce2b24 100644 --- a/src/mainboard/google/skyrim/variants/winterhold/Makefile.inc +++ b/src/mainboard/google/skyrim/variants/winterhold/Makefile.inc @@ -2,4 +2,7 @@ subdirs-y += ./memory +romstage-y += port_descriptors.c + ramstage-y += gpio.c +ramstage-y += port_descriptors.c diff --git a/src/mainboard/google/skyrim/variants/winterhold/port_descriptors.c b/src/mainboard/google/skyrim/variants/winterhold/port_descriptors.c new file mode 100644 index 0000000000..37edb0261a --- /dev/null +++ b/src/mainboard/google/skyrim/variants/winterhold/port_descriptors.c @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include +#include +#include +#include + +static const fsp_dxio_descriptor emmc_dxio_descriptors[] = { + { + /* WLAN */ + .engine_type = PCIE_ENGINE, + .port_present = true, + .start_logical_lane = 0, + .end_logical_lane = 0, + .device_number = PCI_SLOT(WLAN_DEVFN), + .function_number = PCI_FUNC(WLAN_DEVFN), + .link_speed_capability = GEN3, + .turn_off_unused_lanes = true, + .link_aspm = ASPM_L1, + .link_aspm_L1_1 = true, + .link_aspm_L1_2 = true, + .clk_req = CLK_REQ2, + }, + { + /* eMMC */ + .engine_type = PCIE_ENGINE, + .port_present = true, + .start_logical_lane = 1, + .end_logical_lane = 1, + .device_number = PCI_SLOT(SD_DEVFN), + .function_number = PCI_FUNC(SD_DEVFN), + .link_speed_capability = GEN3, + .turn_off_unused_lanes = true, + .link_aspm = ASPM_L1, + .link_aspm_L1_1 = true, + .link_aspm_L1_2 = true, + .gpio_group_id = GPIO_27, + .clk_req = CLK_REQ1, + }, +}; + +static const fsp_dxio_descriptor nvme_dxio_descriptors[] = { + { + /* WLAN */ + .engine_type = PCIE_ENGINE, + .port_present = true, + .start_logical_lane = 0, + .end_logical_lane = 0, + .device_number = PCI_SLOT(WLAN_DEVFN), + .function_number = PCI_FUNC(WLAN_DEVFN), + .link_speed_capability = GEN3, + .turn_off_unused_lanes = true, + .link_aspm = ASPM_L1, + .link_aspm_L1_1 = true, + .link_aspm_L1_2 = true, + .clk_req = CLK_REQ2, + }, + { + /* SSD */ + .engine_type = PCIE_ENGINE, + .port_present = true, + .start_logical_lane = 2, + .end_logical_lane = 3, + .device_number = PCI_SLOT(NVME_DEVFN), + .function_number = PCI_FUNC(NVME_DEVFN), + .link_speed_capability = GEN3, + .turn_off_unused_lanes = true, + .link_aspm = ASPM_L1, + .link_aspm_L1_1 = true, + .link_aspm_L1_2 = true, + .gpio_group_id = GPIO_6, + .clk_req = CLK_REQ0, + }, +}; + +#define NVME_CLKREQ_GPIO 92 +void variant_get_dxio_descriptor(const fsp_dxio_descriptor **dxio_descs, size_t *dxio_num) +{ + /* + * We can determine if a device is populated based on the state of the clkreq + * signal. If the device is present, the clkreq is held low by the device. If + * no device is present, clkreq is pulled high by an external pull-up. + * + * This allows checking the state of the NVMe device clkreq signal and enabling + * either eMMC or NVMe based on that. + */ + if (gpio_get(NVME_CLKREQ_GPIO)) { + printk(BIOS_DEBUG, "Enabling eMMC.\n"); + *dxio_num = ARRAY_SIZE(emmc_dxio_descriptors); + *dxio_descs = emmc_dxio_descriptors; + } else { + printk(BIOS_DEBUG, "Enabling NVMe.\n"); + *dxio_num = ARRAY_SIZE(nvme_dxio_descriptors); + *dxio_descs = nvme_dxio_descriptors; + } +} -- cgit v1.2.3