PCI: keystone: Add workaround for Errata #i2037 (AM65x SR 1.0)

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: PCI: keystone: Add workaround for Errata #i2037 (AM65x SR 1.0) Errata #i2037 in AM65x/DRA80xM Processors Silicon Revision 1.0 (SPRZ452D_July 2018_Revised December 2019 [1]) mentions when an inbound PCIe TLP spans more than two internal AXI 128-byte bursts, the bus may corrupt the packet payload and the corrupt data may cause associated applications or the processor to hang. The workaround for Errata #i2037 is to limit the maximum read request size and maximum payload size to 128 bytes. Add workaround for Errata #i2037 here. The errata and workaround is applicable only to AM65x SR 1.0 and later versions of the silicon will have this fixed. [1] -> https://www.ti.com/lit/er/sprz452i/sprz452i.pdf

References

• https://git.kernel.org/stable/c/cfb006e185f64edbbdf7869eac352442bc76b8f6
• https://git.kernel.org/stable/c/ebbdbbc580c1695dec283d0ba6448729dc993246
• https://git.kernel.org/stable/c/135843c351c08df72bdd4b4ebea53c8052a76881
• https://git.kernel.org/stable/c/af218c803fe298ddf00abef331aa526b20d7ea61
• https://git.kernel.org/stable/c/576d0fb6f8d4bd4695e70eee173a1b9c7bae9572
• https://git.kernel.org/stable/c/dd47051c76c8acd8cb983f01b4d1265da29cb66a
• https://git.kernel.org/stable/c/86f271f22bbb6391410a07e08d6ca3757fda01fa