Re: [PATCH v3] PCI: imx6: Keep i.MX6Q Root Port MSI capability with iMSI-RX to work around hardware bug

[sashiko-bot@kernel.org]

> From: Soeren Moch <smoch@web.de>
> 
> 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 3a4e8302e72f ("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: f5cd8a929c825 ("PCI: dwc: Remove MSI/MSIX capability for Root Port if iMSI-RX is used as MSI controller")
> Cc: <stable@vger.kernel.org> # 7.0+
> Signed-off-by: Soeren Moch <smoch@web.de>
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260717033203.2965045-1-hongxing.zhu@oss.nxp.com?part=1