linux-kernel - [PATCH v3 4/8] PCI: qcom: Do not advertise hotplug capability for IPs v2.3.3 and v2.9.0

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Date:   Thu,  1 Jun 2023 22:08:56 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     lpieralisi@...nel.org, kw@...ux.com, bhelgaas@...gle.com
Cc:     robh@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, steev@...i.org,
        quic_srichara@...cinc.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH v3 4/8] PCI: qcom: Do not advertise hotplug capability for IPs v2.3.3 and v2.9.0

SoCs making use of Qcom PCIe controller IPs v2.3.3 and v2.9.0 do not
support hotplug functionality. But the hotplug capability bit is set by
default in the hardware. This causes the kernel PCI core to register
hotplug service for the controller and send hotplug commands to it. But
those commands will timeout generating messages as below during boot
and suspend/resume.

[    5.782159] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x03c0 (issued 2020 msec ago)
[    5.810161] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x03c0 (issued 2048 msec ago)
[    7.838162] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x07c0 (issued 2020 msec ago)
[    7.870159] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x07c0 (issued 2052 msec ago)

This not only spams the console output but also induces a delay of a
couple of seconds. To fix this issue, let's not set the HPC bit in
PCI_EXP_SLTCAP register as a part of the post init sequence to not
advertise the hotplug capability for the controller.

Tested-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8f448156eccc..64b6a8c6a99d 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -140,7 +140,6 @@
 						PCI_EXP_SLTCAP_AIP | \
 						PCI_EXP_SLTCAP_PIP | \
 						PCI_EXP_SLTCAP_HPS | \
-						PCI_EXP_SLTCAP_HPC | \
 						PCI_EXP_SLTCAP_EIP | \
 						PCIE_CAP_SLOT_POWER_LIMIT_VAL | \
 						PCIE_CAP_SLOT_POWER_LIMIT_SCALE)
-- 
2.25.1