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PCI: Fix 64GT/s effective data rate calculation
author
Ilpo Järvinen
<ilpo.jarvinen@linux.intel.com>
Tue, 2 Jan 2024 17:27:00 +0000
(19:27 +0200)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Mon, 5 Feb 2024 20:14:32 +0000
(20:14 +0000)
[ Upstream commit
ac4f1897fa5433a1b07a625503a91b6aa9d7e643
]
Unlike the lower rates, the PCIe 64GT/s Data Rate uses 1b/1b encoding, not
128b/130b (PCIe r6.1 sec 1.2, Table 1-1). Correct the PCIE_SPEED2MBS_ENC()
calculation to reflect that.
Link:
https://lore.kernel.org/r/20240102172701.65501-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/pci/pci.h
patch
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history
diff --git
a/drivers/pci/pci.h
b/drivers/pci/pci.h
index
5484048
..
99abc4c
100644
(file)
--- a/
drivers/pci/pci.h
+++ b/
drivers/pci/pci.h
@@
-269,7
+269,7
@@
void pci_bus_put(struct pci_bus *bus);
/* PCIe speed to Mb/s reduced by encoding overhead */
#define PCIE_SPEED2MBS_ENC(speed) \
- ((speed) == PCIE_SPEED_64_0GT ? 64000*1
28/130
: \
+ ((speed) == PCIE_SPEED_64_0GT ? 64000*1
/1
: \
(speed) == PCIE_SPEED_32_0GT ? 32000*128/130 : \
(speed) == PCIE_SPEED_16_0GT ? 16000*128/130 : \
(speed) == PCIE_SPEED_8_0GT ? 8000*128/130 : \