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PCI: brcmstb: Add suspend and resume pm_ops 

Broadcom Set-top (BrcmSTB) boards typically support S2, S3, and S5 suspend
and resume.  Now the PCIe driver may do so as well.

Link: https://lore.kernel.org/r/20200911175232.19016-5-james.quinlan@broadcom.com
Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Jim Quinlan 2020-09-11 13:52:24 -04:00 committed by Lorenzo Pieralisi
parent 1cf1b0a6dd
commit 8195b74170
1 changed files with 47 additions and 0 deletions
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47
drivers/pci/controller/pcie-brcmstb.c
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@ -978,6 +978,47 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
brcm_pcie_bridge_sw_init_set(pcie, 1);
}
static int brcm_pcie_suspend(struct device *dev)
{
struct brcm_pcie *pcie = dev_get_drvdata(dev);
brcm_pcie_turn_off(pcie);
clk_disable_unprepare(pcie->clk);
return 0;
}
static int brcm_pcie_resume(struct device *dev)
{
struct brcm_pcie *pcie = dev_get_drvdata(dev);
void __iomem *base;
u32 tmp;
int ret;
base = pcie->base;
clk_prepare_enable(pcie->clk);
/* Take bridge out of reset so we can access the SERDES reg */
brcm_pcie_bridge_sw_init_set(pcie, 0);
/* SERDES_IDDQ = 0 */
tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
u32p_replace_bits(&tmp, 0, PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK);
writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
/* wait for serdes to be stable */
udelay(100);
ret = brcm_pcie_setup(pcie);
if (ret)
return ret;
if (pcie->msi)
brcm_msi_set_regs(pcie->msi);
return 0;
}
static void __brcm_pcie_remove(struct brcm_pcie *pcie)
{
brcm_msi_remove(pcie);
@ -1087,12 +1128,18 @@ static int brcm_pcie_probe(struct platform_device *pdev)
MODULE_DEVICE_TABLE(of, brcm_pcie_match);
static const struct dev_pm_ops brcm_pcie_pm_ops = {
.suspend = brcm_pcie_suspend,
.resume = brcm_pcie_resume,
};
static struct platform_driver brcm_pcie_driver = {
.probe = brcm_pcie_probe,
.remove = brcm_pcie_remove,
.driver = {
.name = "brcm-pcie",
.of_match_table = brcm_pcie_match,
.pm = &brcm_pcie_pm_ops,
},
};
module_platform_driver(brcm_pcie_driver);