Messages in this thread Patch in this message | | | From | Andy Shevchenko <> | Subject | [PATCH v2 1/1] mfd: intel-lpss: Try to enable Memory-Write-Invalidate | Date | Tue, 15 Nov 2016 12:37:04 +0200 |
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Enable MWI mechanism if PCI bus master supports it.
It might be potential benefit in some cases. Documentation [1] says that standard Memory Write might supply more current data than in the CPU modified cache line and "trashing a line in the cache may trash some data that is more current that in the memory line". This allows to avoid potential retries and other performance degradation issues on the bus.
[1] PCI System Architecture, 4th edition, ISBN: 0-201-30974-2, pp.117-119.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- In v2: - extend commit message drivers/mfd/intel-lpss-pci.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c index 50e78db..4756153 100644 --- a/drivers/mfd/intel-lpss-pci.c +++ b/drivers/mfd/intel-lpss-pci.c @@ -41,6 +41,7 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev, /* Probably it is enough to set this for iDMA capable devices only */ pci_set_master(pdev); + pci_try_set_mwi(pdev); ret = intel_lpss_probe(&pdev->dev, info); if (ret) -- 2.9.3
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