diff options
Diffstat (limited to 'target/linux/generic/pending-4.9/812-pci-dwc-fix-enumeration.patch')
| -rw-r--r-- | target/linux/generic/pending-4.9/812-pci-dwc-fix-enumeration.patch | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/target/linux/generic/pending-4.9/812-pci-dwc-fix-enumeration.patch b/target/linux/generic/pending-4.9/812-pci-dwc-fix-enumeration.patch deleted file mode 100644 index bb0e0c4bb7..0000000000 --- a/target/linux/generic/pending-4.9/812-pci-dwc-fix-enumeration.patch +++ /dev/null @@ -1,60 +0,0 @@ -From patchwork Tue Jan 9 14:42:21 2018 -Content-Type: text/plain; charset="utf-8" -MIME-Version: 1.0 -Content-Transfer-Encoding: 7bit -Subject: PCI: dwc: fix enumeration end when reaching root subordinate -From: Koen Vandeputte <koen.vandeputte@ncentric.com> -X-Patchwork-Id: 10152443 -Message-Id: <1515508941-20055-1-git-send-email-koen.vandeputte@ncentric.com> -To: linux-pci@vger.kernel.org -Cc: bhelgaas@google.com, lorenzo.pieralisi@arm.com, - Joao.Pinto@synopsys.com, jingoohan1@gmail.com, niklas.cassel@axis.com, - Koen Vandeputte <koen.vandeputte@ncentric.com>, - Mika Westerberg <mika.westerberg@linux.intel.com> -Date: Tue, 9 Jan 2018 15:42:21 +0100 - -The subordinate value indicates the highest bus number which can be -reached downstream though a certain device. - -Commit a20c7f36bd3d ("PCI: Do not allocate more buses than available in -parent") -ensures that downstream devices cannot assign busnumbers higher than the -upstream device subordinate number, which was indeed illogical. - -By default, dw_pcie_setup_rc() inits the Root Complex subordinate to a -value of 0x01. - -Due to this combined with above commit, enumeration stops digging deeper -downstream as soon as bus num 0x01 has been assigned, which is always -the case for a bridge device. - -This results in all devices behind a bridge bus to remain undetected, as -these would be connected to bus 0x02 or higher. - -Fix this by initializing the RC to a subordinate value of 0xff, meaning -that all busses [0x00-0xff] are reachable through this RC. - -Fixes: a20c7f36bd3d ("PCI: Do not allocate more buses than available in -parent") -Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com> -Tested-by: Niklas Cassel <niklas.cassel@axis.com> -Cc: Mika Westerberg <mika.westerberg@linux.intel.com> ---- - -Will send separate patches to stable as this file got moved/renamed - - - drivers/pci/host/pcie-designware.c | 2 +- - 1 file changed, 1 insertion(+), 1 deletion(-) - ---- a/drivers/pci/host/pcie-designware.c -+++ b/drivers/pci/host/pcie-designware.c -@@ -861,7 +861,7 @@ void dw_pcie_setup_rc(struct pcie_port * - /* setup bus numbers */ - val = dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS); - val &= 0xff000000; -- val |= 0x00010100; -+ val |= 0x00ff0100; - dw_pcie_writel_rc(pp, PCI_PRIMARY_BUS, val); - - /* setup command register */ |