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PCI: pciehp: Add pciehp_set_indicators() to set both indicators

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Add pciehp_set_indicators() to set power and attention indicators with a
single register write.

This is a minor optimization because we frequently set both indicators and
this can do it with a single command.  It also reduces the number of
interfaces related to the indicators and makes them more discoverable
because callers use the PCI_EXP_SLTCTL_ATTN_IND_* and
PCI_EXP_SLTCTL_PWR_IND_* definitions directly.

[bhelgaas: extend commit log, s/PCI_EXP_SLTCTL_.*_IND_NONE/INDICATOR_NOOP/
so they don't look like things defined by the spec, add function doc, mask
commands to make it obvious we only send valid commands
(pcie_do_write_cmd() does mask it, but requires more effort to verify)]
Link: https://lore.kernel.org/r/20190903111021.1559-2-efremov@linux.com
Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Denis Efremov 2019-09-03 14:10:18 +03:00 committed by Bjorn Helgaas
parent 5f9e832c13
commit 688033f52d
2 changed files with 39 additions and 0 deletions
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3
drivers/pci/hotplug/pciehp.h
View file

@ -167,6 +167,9 @@ int pciehp_power_on_slot(struct controller *ctrl);
void pciehp_power_off_slot(struct controller *ctrl);
void pciehp_get_power_status(struct controller *ctrl, u8 *status);
#define INDICATOR_NOOP -1 /* Leave indicator unchanged */
void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn);
void pciehp_set_attention_status(struct controller *ctrl, u8 status);
void pciehp_get_latch_status(struct controller *ctrl, u8 *status);
int pciehp_query_power_fault(struct controller *ctrl);

36
drivers/pci/hotplug/pciehp_hpc.c
View file

@ -443,6 +443,42 @@ void pciehp_set_attention_status(struct controller *ctrl, u8 value)
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
}
/**
* pciehp_set_indicators() - set attention indicator, power indicator, or both
* @ctrl: PCIe hotplug controller
* @pwr: one of:
* PCI_EXP_SLTCTL_PWR_IND_ON
* PCI_EXP_SLTCTL_PWR_IND_BLINK
* PCI_EXP_SLTCTL_PWR_IND_OFF
* @attn: one of:
* PCI_EXP_SLTCTL_ATTN_IND_ON
* PCI_EXP_SLTCTL_ATTN_IND_BLINK
* PCI_EXP_SLTCTL_ATTN_IND_OFF
*
* Either @pwr or @attn can also be INDICATOR_NOOP to leave that indicator
* unchanged.
*/
void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn)
{
u16 cmd = 0, mask = 0;
if (PWR_LED(ctrl) && pwr != INDICATOR_NOOP) {
cmd |= (pwr & PCI_EXP_SLTCTL_PIC);
mask |= PCI_EXP_SLTCTL_PIC;
}
if (ATTN_LED(ctrl) && attn != INDICATOR_NOOP) {
cmd |= (attn & PCI_EXP_SLTCTL_AIC);
mask |= PCI_EXP_SLTCTL_AIC;
}
if (cmd) {
pcie_write_cmd_nowait(ctrl, cmd, mask);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, cmd);
}
}
void pciehp_green_led_on(struct controller *ctrl)
{
if (!PWR_LED(ctrl))