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PCI/ASPM: Allow re-enabling Clock PM 

Previously Clock PM could not be re-enabled after being disabled by
pci_disable_link_state() because clkpm_capable was reset.  Change this by
adding a clkpm_disable field similar to aspm_disable.

Link: https://lore.kernel.org/r/4e8a66db-7d53-4a66-c26c-f0037ffaa705@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Heiner Kallweit 2019-10-05 14:03:57 +02:00 committed by Bjorn Helgaas
parent aff5d0552d
commit 35efea32b2
1 changed files with 11 additions and 7 deletions
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18
drivers/pci/pcie/aspm.c
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@ -64,6 +64,7 @@ struct pcie_link_state {
u32 clkpm_capable:1; /* Clock PM capable? */
u32 clkpm_enabled:1; /* Current Clock PM state */
u32 clkpm_default:1; /* Default Clock PM state by BIOS */
u32 clkpm_disable:1; /* Clock PM disabled */
/* Exit latencies */
struct aspm_latency latency_up; /* Upstream direction exit latency */
@ -161,8 +162,11 @@ static void pcie_set_clkpm_nocheck(struct pcie_link_state *link, int enable)
static void pcie_set_clkpm(struct pcie_link_state *link, int enable)
{
/* Don't enable Clock PM if the link is not Clock PM capable */
if (!link->clkpm_capable)
/*
* Don't enable Clock PM if the link is not Clock PM capable
* or Clock PM is disabled
*/
if (!link->clkpm_capable || link->clkpm_disable)
enable = 0;
/* Need nothing if the specified equals to current state */
if (link->clkpm_enabled == enable)
@ -192,7 +196,8 @@ static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist)
}
link->clkpm_enabled = enabled;
link->clkpm_default = enabled;
link->clkpm_capable = (blacklist) ? 0 : capable;
link->clkpm_capable = capable;
link->clkpm_disable = blacklist ? 1 : 0;
}
static bool pcie_retrain_link(struct pcie_link_state *link)
@ -1106,10 +1111,9 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
link->aspm_disable |= ASPM_STATE_L1_2_PCIPM;
pcie_config_aspm_link(link, policy_to_aspm_state(link));
if (state & PCIE_LINK_STATE_CLKPM) {
link->clkpm_capable = 0;
pcie_set_clkpm(link, 0);
}
if (state & PCIE_LINK_STATE_CLKPM)
link->clkpm_disable = 1;
pcie_set_clkpm(link, policy_to_clkpm_state(link));
mutex_unlock(&aspm_lock);
if (sem)
up_read(&pci_bus_sem);