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Diffstat (limited to 'meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/README.md')
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diff --git a/meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/README.md b/meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/README.md new file mode 100644 index 000000000..63b52d746 --- /dev/null +++ b/meta-quanta/meta-gsj/recipes-gsj/quanta-nvme-powerctrl/README.md @@ -0,0 +1,46 @@ +### NVME SSD Power Control Manager + +#### Description + The package mantains for SSD power control and related noification handle Deamon + +#### Design + + The service power supply design follow PCI Express Card Electromechanical Specification Revision 3.0 in Section 2.2 + + nvme_gpio.service follow section 2.2.1 Initial power-Up to initinal and adjust related signal. + + nvme_powermanager.service follow section 2.2.2 power management states monitor PRESENT signal and update related signal. + +#### Process + + * Plugging + 1. U2_[SSD_index] PRSNT_N will be input low + 2. Set PWR_U2_[SSD_index]_EN to high + 3. Check PWRGD_U2_[SSD_index] is high + 4-1. If PWRGD_U2_[SSD_index] is high (PWR Good) + - Wait 5ms + - Enable PCI Clock by SMBus 9FGL0851 + - Wait 100ms + - Set RST_BMC_U2 to high + + 4-2. If PWRGD_U2_[SSD_index] is low (PWR Fail) + - Set RST_BMC_U2_[SSD_index]_R_N to low + - Wait 100ms + - Disable PCI Clock by SMBus + + * Removing + 1. U2_[SSD_index] PRSNT_N will be input high + 2. Set RST_BMC_U2 to low + 3. Wait 100ms + 4. Disable PCI Clock by SMBus + 5. Wait 5ms + 6. PWR_U2_[SSD_index]_EN to low + +#### Test + + 1. PRESENT detect SSD: The hardware design has been implemented. + 2. Initial SSD slot Power output: nvme_gpio service has tested on Module. It could sucess initial gpios and set correct power output. + 3. Detect PRESENT and change power setting: nvme_powermanager service has tested on Module. It could success detect SSD plugged or removal change power output. + 4. Improve initial power-up sequence: For matched hardware default initial power-up setting, the nvme_gpio service only set unplugged slot related signal. + 5. Improve service execute sequence: nvme_powermanager.service must wait for nvme_gpio.service ensure gpio export complete. + |