linux-kernel - [PATCH v1] PCI: dwc: Clean up some unnecessary codes in dw_pcie_suspend

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Message-Id: <20241107084455.3623576-1-hongxing.zhu@nxp.com>
Date: Thu,  7 Nov 2024 16:44:55 +0800
From: Richard Zhu <hongxing.zhu@....com>
To: jingoohan1@...il.com,
	bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	frank.li@....com
Cc: imx@...ts.linux.dev,
	kernel@...gutronix.de,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Richard Zhu <hongxing.zhu@....com>
Subject: [PATCH v1] PCI: dwc: Clean up some unnecessary codes in dw_pcie_suspend_noirq()

Before sending PME_TURN_OFF, don't test the LTSSM stat. Since it's safe
to send PME_TURN_OFF message regardless of whether the link is up or
down. So, there would be no need to test the LTSSM stat before sending
PME_TURN_OFF message.

Remove the L2 poll too, after the PME_TURN_OFF message is sent out.
Because the re-initialization would be done in dw_pcie_resume_noirq().

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 .../pci/controller/dwc/pcie-designware-host.c | 20 ++++---------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f86347452026..64c49adf81d2 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -917,7 +917,6 @@ static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
 int dw_pcie_suspend_noirq(struct dw_pcie *pci)
 {
 	u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
-	u32 val;
 	int ret = 0;
 
 	/*
@@ -927,23 +926,12 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
 	if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1)
 		return 0;
 
-	/* Only send out PME_TURN_OFF when PCIE link is up */
-	if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_ACT) {
-		if (pci->pp.ops->pme_turn_off)
-			pci->pp.ops->pme_turn_off(&pci->pp);
-		else
-			ret = dw_pcie_pme_turn_off(pci);
-
+	if (pci->pp.ops->pme_turn_off) {
+		pci->pp.ops->pme_turn_off(&pci->pp);
+	} else {
+		ret = dw_pcie_pme_turn_off(pci);
 		if (ret)
 			return ret;
-
-		ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
-					PCIE_PME_TO_L2_TIMEOUT_US/10,
-					PCIE_PME_TO_L2_TIMEOUT_US, false, pci);
-		if (ret) {
-			dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val);
-			return ret;
-		}
 	}
 
 	dw_pcie_stop_link(pci);
-- 
2.37.1