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Sinan Kaya
f13b4a6198
commit1b30dfd376upstream. Per PCIe r3.1, sec 2.2.6.2 and 7.8.4, a Requester may not use 8-bit Tags unless its Extended Tag Field Enable is set, but all Receivers/Completers must handle 8-bit Tags correctly regardless of their Extended Tag Field Enable. Some devices do not handle 8-bit Tags as Completers, so add a quirk for them. If we find such a device, we disable Extended Tags for the entire hierarchy to make peer-to-peer DMA possible. The Broadcom HT1100/HT2000/HT2100 seems to have issues with handling 8-bit tags. Mark it as broken. This fixes Xorg hangs and unresponsive keyboards with errors like this: radeon 0000:06:00.0: GPU lockup (current fence id 0x000000000000000e last fence id 0x0000000000000 [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD) [drm:r600_resume [radeon]] *ERROR* r600 startup failed on resume Fixes:60db3a4d8c("PCI: Enable PCIe Extended Tags if supported") Link: https://bugzilla.kernel.org/show_bug.cgi?id=196197 Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Bjorn Helgaas <helgaas@kernel.org> CC: stable@vger.kernel.org # v4.11:62ce94a7a5PCI: Mark Broadcom HT2100 Root Port Extended Tags as broken CC: stable@vger.kernel.org # v4.11 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.