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PCI: imx6: Keep i.MX6 Root Port MSI/MSI-X Capabilities with iMSI-RX to work around hardware bug

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On some NXP chipsets, disabling Root Port MSI/MSI-X Capabilities blocks
MSIs originating from Endpoints from reaching the iMSI-RX controller.

To address this hardware bug, commit 3a4e8302e7 ("PCI: imx6: Keep Root
Port MSI capability with iMSI-RX to work around hardware bug") preserves
Root Port MSI and MSI-X Capabilities on i.MX7D, i.MX8MM, and i.MX8MQ
when iMSI-RX is in use.

The same applies to i.MX6Q, i.MX6QP, and i.MX6SX, so preserve Root Port
MSI/MSI-X Capabilities there as well.

Note that preserving these Capabilities means Root Port-originated MSIs
such as AER and PME won't be received due to separate hardware limitations.
Users may need to use workarounds such as passing the 'pcie_pme=nomsi'
command-line parameter.

Fixes: f5cd8a929c ("PCI: dwc: Remove MSI/MSIX capability for Root Port if iMSI-RX is used as MSI controller")
Signed-off-by: Soeren Moch <smoch@web.de>
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Acked-by: Richard Zhu <hongxing.zhu@nxp.com>
Cc: stable@vger.kernel.org # 7.0+
Link: https://patch.msgid.link/20260717033203.2965045-1-hongxing.zhu@oss.nxp.com
This commit is contained in:
Soeren Moch 2026-07-17 11:32:03 +08:00 committed by Bjorn Helgaas
parent 34db321024
commit b4bee12ebe
1 changed files with 6 additions and 3 deletions
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9
drivers/pci/controller/dwc/pci-imx6.c
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@ -1995,7 +1995,8 @@ static const struct imx_pcie_drvdata drvdata[] = {
.flags = IMX_PCIE_FLAG_IMX_PHY |
IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |
IMX_PCIE_FLAG_BROKEN_SUSPEND |
IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
IMX_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX_PCIE_FLAG_KEEP_MSI_CAP,
.dbi_length = 0x200,
.gpr = "fsl,imx6q-iomuxc-gpr",
.ltssm_off = IOMUXC_GPR12,
@ -2011,7 +2012,8 @@ static const struct imx_pcie_drvdata drvdata[] = {
.flags = IMX_PCIE_FLAG_IMX_PHY |
IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |
IMX_PCIE_FLAG_SKIP_L23_READY |
IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
IMX_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX_PCIE_FLAG_KEEP_MSI_CAP,
.gpr = "fsl,imx6q-iomuxc-gpr",
.ltssm_off = IOMUXC_GPR12,
.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
@ -2026,7 +2028,8 @@ static const struct imx_pcie_drvdata drvdata[] = {
.flags = IMX_PCIE_FLAG_IMX_PHY |
IMX_PCIE_FLAG_SPEED_CHANGE_WORKAROUND |
IMX_PCIE_FLAG_SKIP_L23_READY |
IMX_PCIE_FLAG_SUPPORTS_SUSPEND,
IMX_PCIE_FLAG_SUPPORTS_SUSPEND |
IMX_PCIE_FLAG_KEEP_MSI_CAP,
.dbi_length = 0x200,
.gpr = "fsl,imx6q-iomuxc-gpr",
.ltssm_off = IOMUXC_GPR12,