1 // SPDX-License-Identifier: GPL-2.0
30 	if (ups && ups->ptm_cap)  in pci_upstream_ptm()
53 	dev->ptm_cap = ptm;  in pci_ptm_init()
57 	dev->ptm_granularity = FIELD_GET(PCI_PTM_GRANULARITY_MASK, cap);  in pci_ptm_init()
67 		if (ups->ptm_granularity == 0)  in pci_ptm_init()
68 			dev->ptm_granularity = 0;  in pci_ptm_init()
69 		else if (ups->ptm_granularity > dev->ptm_granularity)  in pci_ptm_init()
70 			dev->ptm_granularity = ups->ptm_granularity;  in pci_ptm_init()
72 		dev->ptm_root = 1;  in pci_ptm_init()
80 		dev->ptm_granularity = 0;  in pci_ptm_init()
90 	u16 ptm = dev->ptm_cap;  in pci_save_ptm_state()
101 	cap = (u32 *)&save_state->cap.data[0];  in pci_save_ptm_state()
107 	u16 ptm = dev->ptm_cap;  in pci_restore_ptm_state()
118 	cap = (u32 *)&save_state->cap.data[0];  in pci_restore_ptm_state()
125 	u16 ptm = dev->ptm_cap;  in __pci_enable_ptm()
130 		return -EINVAL;  in __pci_enable_ptm()
135 	 * path must support PTM and have it enabled so it can handle the  in __pci_enable_ptm()
137 	 * upstream link partner must have PTM enabled before we can enable  in __pci_enable_ptm()
140 	if (!dev->ptm_root) {  in __pci_enable_ptm()
142 		if (!ups || !ups->ptm_enabled)  in __pci_enable_ptm()
143 			return -EINVAL;  in __pci_enable_ptm()
150 	ctrl |= FIELD_PREP(PCI_PTM_GRANULARITY_MASK, dev->ptm_granularity);  in __pci_enable_ptm()
151 	if (dev->ptm_root)  in __pci_enable_ptm()
159  * pci_enable_ptm() - Enable Precision Time Measurement
164  * @granularity is non-NULL, return the Effective Granularity.
166  * Return: zero if successful, or -EINVAL if @dev lacks a PTM Capability or
167  * is not a PTM Root and lacks an upstream path of PTM-enabled devices.
178 	dev->ptm_enabled = 1;  in pci_enable_ptm()
181 		*granularity = dev->ptm_granularity;  in pci_enable_ptm()
183 	switch (dev->ptm_granularity) {  in pci_enable_ptm()
192 			 dev->ptm_granularity);  in pci_enable_ptm()
195 	pci_info(dev, "PTM enabled%s, %s granularity\n",  in pci_enable_ptm()
196 		 dev->ptm_root ? " (root)" : "", clock_desc);  in pci_enable_ptm()
204 	u16 ptm = dev->ptm_cap;  in __pci_disable_ptm()
216  * pci_disable_ptm() - Disable Precision Time Measurement
223 	if (dev->ptm_enabled) {  in pci_disable_ptm()
225 		dev->ptm_enabled = 0;  in pci_disable_ptm()
231  * Disable PTM, but preserve dev->ptm_enabled so we silently re-enable it on
236 	if (dev->ptm_enabled)  in pci_suspend_ptm()
240 /* If PTM was enabled before suspend, re-enable it when resuming */
243 	if (dev->ptm_enabled)  in pci_resume_ptm()
252 	return dev->ptm_enabled;  in pcie_ptm_enabled()