[Linux-kernel-mentees] [PATCH 6/13] PCI: pciehp: Make "Power On" the default
From: Saheed Olayemi Bolarinwa <hidden>
Date: 2020-07-07 23:03:54
Also in:
linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
From: Bolarinwa Olayemi Saheed <redacted> The default case of the switch statement is redundant since PCI_EXP_SLTCTL_PCC is only a single bit. pcie_capability_read_word() currently causes "On" value to be set if it fails. Patch 13/13 changes the behaviour of pcie_capability_read_word() so on failure the "Off" value will be set. Make the function set status to "Power On" by default and only set to Set "Power Off" only if pcie_capability_read_word() is successful and (slot_ctrl & PCI_EXP_SLTCTL_PCC) == PCI_EXP_SLTCTL_PWR_OFF. Suggested-by: Bjorn Helgaas <redacted> Signed-off-by: Bolarinwa Olayemi Saheed <redacted> --- drivers/pci/hotplug/pciehp_hpc.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 0b691e37fd04..78f806a9c6f1 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c@@ -399,22 +399,16 @@ void pciehp_get_power_status(struct controller *ctrl, u8 *status) { struct pci_dev *pdev = ctrl_dev(ctrl); u16 slot_ctrl; + int ret; - pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); + *status = 1; /* On */ + ret = pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl); ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n", __func__, pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl); - switch (slot_ctrl & PCI_EXP_SLTCTL_PCC) { - case PCI_EXP_SLTCTL_PWR_ON: - *status = 1; /* On */ - break; - case PCI_EXP_SLTCTL_PWR_OFF: + if (!ret && + ((slot_ctrl & PCI_EXP_SLTCTL_PCC) == PCI_EXP_SLTCTL_PWR_OFF)) *status = 0; /* Off */ - break; - default: - *status = 0xFF; - break; - } } void pciehp_get_latch_status(struct controller *ctrl, u8 *status)
--
2.18.2
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