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Diffstat (limited to 'meta-quanta/meta-gsj/recipes-phosphor/quanta-nvme-powerctrl/README.md')
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diff --git a/meta-quanta/meta-gsj/recipes-phosphor/quanta-nvme-powerctrl/README.md b/meta-quanta/meta-gsj/recipes-phosphor/quanta-nvme-powerctrl/README.md new file mode 100644 index 000000000..51a9e8fe5 --- /dev/null +++ b/meta-quanta/meta-gsj/recipes-phosphor/quanta-nvme-powerctrl/README.md @@ -0,0 +1,50 @@ +### NVME SSD Power Control Manager + +#### Description + The Package is Mantain for SSD power control and related noification handle Deamon + +#### Design + nvme_gpio.service for initinal related GPIOs ( PRESENT, PWR, PWRGD, RST_U2 ) and according PRESENT signal fix HW PWR default output signal. + + nvme_powermanager.service loop for monitor PRESENT signal and update PWR output. + +#### 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 + - Reset RST_BMC_U2 [low->high] + - Send Assert to tell package could read SSD status. + + 4-2. If PWRGD_U2_[SSD_index] is low (PWR Fail) + - Disable Clock by SMBus + - Wait 100ms + - Set RST_BMC_U2_[SSD_index]_R_N to low + - Set LED_U2_FAULT to high + + * Removing + 1. U2_[SSD_index]PRSNT_N will be input high + 2. Disable Clock by SMBus 9FGL0851 + 3. PWR_U2_[SSD_index]_EN to low + 4. Check PWRGD_U2_[SSD_index] is low + 5. Send Assert to tell package update SSD status. + + +#### TODO + + 1. After power on ssd, bmc send command to 9FGL0851 (on SMBus8 0x68) for enable PCI clock, and send RST_BMC_U2 pin rsing event (set low, wait 500ms, set high). The Host could rescan PCI and detect SSD device. + +#### Test + + 1. PRESENT detect SSD: The Default Hardware is implement. + 2. Initial SSD slot Power output: nvme_gpio service has test on Module. It could sucess initial gpios and setting 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 PWR output. + 4. NVME-MI connect: Ensure SSD power is ready then it will notify quanta NVME-MI package could read SSD information. + 5. FAULT LED handle: When detect power output irregular by PWRGD pin, the service will trigger related FAULT LED. + + |