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f31ab2abef
Some VRX518 modems fail to initialize properly with the error message "dc_ep_clk_on failed". As a result, the DSL data path doesn't work. This hack, which is based on code from the FRITZ!Box 7530 GPL archive, fixes the issue. It changes the PCIe vendor/device ID to values matching a Lantiq SoC. It also appears to emulate a Lantiq CPU ID register for connected PCIe devices, by remapping the matching address area to a specially crafted buffer using the address translation unit. A dedicated compatible is created to activate this in the device tree, so this shouldn't affect any devices other than FRITZ!Box 7530/7520. Original investigation was done in59f5212517which used the "avm,host_magic" property to enabled the patch. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> Signed-off-by: Florian Maurer <f.maurer@outlook.de> Link: https://github.com/openwrt/openwrt/pull/17622 Signed-off-by: Robert Marko <robimarko@gmail.com> (cherry picked from commit676dcb1b2c)