Hello, > The suspend/resume functionality is currently broken on the i.MX6QDL > platform, as documented in the NXP errata (ERR005723): > https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf > > This patch addresses the issue by sharing most of the suspend/resume > sequences used by other i.MX devices, while avoiding modifications to > critical registers that disrupt the PCIe functionality. It targets the > same problem as the following downstream commit: > https://github.com/nxp-imx/linux-imx/commit/4e92355e1f79d225ea842511fcfd42b343b32995 > > Unlike the downstream commit, this patch also resets the connected PCIe > device if possible. Without this reset, certain drivers, such as ath10k > or iwlwifi, will crash on resume. The device reset is also done by the > driver on other i.MX platforms, making this patch consistent with > existing practices. > > Without this patch, suspend/resume will fail on i.MX6QDL devices if a > PCIe device is connected. Upon resuming, the kernel will hang and > display an error. Here's an example of the error encountered with the > ath10k driver: > ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible > Unhandled fault: imprecise external abort (0x1406) at 0x0106f944 Applied to controller/imx6, thank you! [01/01] PCI: imx6: Fix suspend/resume support on i.MX6QDL https://git.kernel.org/pci/pci/c/1a2a9024f84d Krzysztof
