On 9/10/2020 11:50 AM, Rob Herring wrote:
On Thu, Sep 10, 2020 at 10:42 AM Jim Quinlan <james.quinlan@xxxxxxxxxxxx> wrote:
On Thu, Sep 10, 2020 at 11:56 AM Rob Herring <robh@xxxxxxxxxx> wrote:
On Mon, Aug 24, 2020 at 03:30:17PM -0400, Jim Quinlan wrote:
From: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
Broadcom Set-top (BrcmSTB) boards typically support S2, S3, and S5 suspend
and resume. Now the PCIe driver may do so as well.
Signed-off-by: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
Acked-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
---
drivers/pci/controller/pcie-brcmstb.c | 47 +++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index c2b3d2946a36..3d588ab7a6dd 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -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);
Really needs to be a spinloop?
+
+ 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_noirq = brcm_pcie_suspend,
+ .resume_noirq = brcm_pcie_resume,
Why do you need interrupts disabled? There's 39 cases of .suspend_noirq
and 1352 of .suspend in the tree.
I will test switching this to suspend_late/resume_early.
Why not just the 'regular' flavor suspend/resume?
We must have inherited this from when the driver was not a
platform_device back in our 3.14 downstream kernel and we used
syscore_ops to do the system suspend/resume.
Later on, we sort of mechanically made those _noirq() to preserve the
semantics of syscore_ops, but in hindsight it should not be necessary,
the regular suspsend/resume should work and the device driver model
ordering between parent/child should take care of the bridge being
suspended last within the PCI bus type that is.
--
Florian
