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| author | Pali Rohár <pali@kernel.org> | 2021-11-25 01:26:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-01 09:23:31 +0100 |
| commit | 086226048bcde44706b3b6ebde432a57ccf90a13 (patch) | |
| tree | 559e36956794eee56c883d21026dcea13545e9cf /Documentation | |
| parent | 7c517d7b8898db064355493c8d5617838439f1b4 (diff) | |
PCI: aardvark: Fix support for PCI_BRIDGE_CTL_BUS_RESET on emulated bridge
commit bc4fac42e5f8460af09c0a7f2f1915be09e20c71 upstream.
Aardvark supports PCIe Hot Reset via PCIE_CORE_CTRL1_REG.
Use it for implementing PCI_BRIDGE_CTL_BUS_RESET bit of PCI_BRIDGE_CONTROL
register on emulated bridge.
With this, the function pci_reset_secondary_bus() starts working and can
reset connected PCIe card. Custom userspace script [1] which uses setpci
can trigger PCIe Hot Reset and reset the card manually.
[1] https://alexforencich.com/wiki/en/pcie/hot-reset-linux
Link: https://lore.kernel.org/r/20211028185659.20329-7-kabel@kernel.org
Fixes: 8a3ebd8de328 ("PCI: aardvark: Implement emulated root PCI bridge config space")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions