https://github.com/torvalds/linux
Revision f1f90e254e46e0a14220e4090041f68256fbe297 authored by Mikulas Patocka on 26 November 2018, 16:37:13 UTC, committed by Bjorn Helgaas on 01 December 2018, 05:42:03 UTC
The macros PCI_EXP_LNKCAP_SLS_*GB are values, not bit masks. We must mask the register and compare it against them. This fixes errors like this: amdgpu: [powerplay] failed to send message 261 ret is 0 when a PCIe-v3 card is plugged into a PCIe-v1 slot, because the slot is being incorrectly reported as PCIe-v3 capable. 6cf57be0f78e, which appeared in v4.17, added pcie_get_speed_cap() with the incorrect test of PCI_EXP_LNKCAP_SLS as a bitmask. 5d9a63304032, which appeared in v4.19, changed amdgpu to use pcie_get_speed_cap(), so the amdgpu bug reports below are regressions in v4.19. Fixes: 6cf57be0f78e ("PCI: Add pcie_get_speed_cap() to find max supported link speed") Fixes: 5d9a63304032 ("drm/amdgpu: use pcie functions for link width and speed") Link: https://bugs.freedesktop.org/show_bug.cgi?id=108704 Link: https://bugs.freedesktop.org/show_bug.cgi?id=108778 Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> [bhelgaas: update comment, remove use of PCI_EXP_LNKCAP_SLS_8_0GB and PCI_EXP_LNKCAP_SLS_16_0GB since those should be covered by PCI_EXP_LNKCAP2, remove test of PCI_EXP_LNKCAP for zero, since that register is required] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org # v4.17+
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Tip revision: f1f90e254e46e0a14220e4090041f68256fbe297 authored by Mikulas Patocka on 26 November 2018, 16:37:13 UTC
PCI: Fix incorrect value returned from pcie_get_speed_cap()
PCI: Fix incorrect value returned from pcie_get_speed_cap()
Tip revision: f1f90e2
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