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mei: me: add kdoc for mei_me_fw_type_nm()

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Add kdoc for mei_me_fw_type_nm() function.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20200619165121.2145330-4-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2020-06-19 19:51:18 +03:00 committed by Greg Kroah-Hartman
parent 4d3c6c8eb9
commit 3fbd1dfe26
1 changed files with 14 additions and 1 deletions
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15
drivers/misc/mei/hw-me.c
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@ -1353,11 +1353,24 @@ static const struct mei_hw_ops mei_me_hw_ops = {
.read = mei_me_read_slots
};
/**
* mei_me_fw_type_nm() - check for nm sku
*
* Read ME FW Status register to check for the Node Manager (NM) Firmware.
* The NM FW is only signaled in PCI function 0.
* __Note__: Deprecated by PCH8 and newer.
*
* @pdev: pci device
*
* Return: true in case of NM firmware
*/
static bool mei_me_fw_type_nm(const struct pci_dev *pdev)
{
u32 reg;
unsigned int devfn;
pci_read_config_dword(pdev, PCI_CFG_HFS_2, &reg);
devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
pci_bus_read_config_dword(pdev->bus, devfn, PCI_CFG_HFS_2, &reg);
trace_mei_pci_cfg_read(&pdev->dev, "PCI_CFG_HFS_2", PCI_CFG_HFS_2, reg);
/* make sure that bit 9 (NM) is up and bit 10 (DM) is down */
return (reg & 0x600) == 0x200;