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authorTejun Heo <tj@kernel.org>2009-09-22 17:34:48 +0900
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-11-04 08:47:11 -0800
commit15ea76d407d560f985224b65fe59c9db01692a0d (patch)
treedd9dd1cd4cab4bff26c34853a1c67898e8500243 /drivers/pci/pci.c
parent4c0eec7a86303ce6e3edf7825d0ef1d414e76767 (diff)
pccard: configure CLS on attach
For non hotplug PCI devices, the system firmware usually configures CLS correctly. For pccard devices system firmware can't do it and Linux PCI layer doesn't do it either. Unfortunately this leads to poor performance for certain devices (sata_sil). Unless MWI, which requires separate configuration, is to be used, CLS doesn't affect correctness, so the configuration should be harmless. This patch makes pci_set_cacheline_size() always built and export it and make pccard call it during attach. Please note that some other PCI hotplug drivers (shpchp and pciehp) also configure CLS on hotplug. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Daniel Ritz <daniel.ritz@gmx.ch> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: Greg KH <greg@kroah.com> Cc: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Cc: Axel Birndt <towerlexa@gmx.de> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c40
1 files changed, 20 insertions, 20 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 01337b7a215..d1afbae5b1f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1875,23 +1875,6 @@ void pci_clear_master(struct pci_dev *dev)
__pci_set_master(dev, false);
}
-#ifdef PCI_DISABLE_MWI
-int pci_set_mwi(struct pci_dev *dev)
-{
- return 0;
-}
-
-int pci_try_set_mwi(struct pci_dev *dev)
-{
- return 0;
-}
-
-void pci_clear_mwi(struct pci_dev *dev)
-{
-}
-
-#else
-
/**
* pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
* @dev: the PCI device for which MWI is to be enabled
@@ -1902,13 +1885,12 @@ void pci_clear_mwi(struct pci_dev *dev)
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
-static int
-pci_set_cacheline_size(struct pci_dev *dev)
+int pci_set_cacheline_size(struct pci_dev *dev)
{
u8 cacheline_size;
if (!pci_cache_line_size)
- return -EINVAL; /* The system doesn't support MWI. */
+ return -EINVAL;
/* Validate current setting: the PCI_CACHE_LINE_SIZE must be
equal to or multiple of the right value. */
@@ -1929,6 +1911,24 @@ pci_set_cacheline_size(struct pci_dev *dev)
return -EINVAL;
}
+EXPORT_SYMBOL_GPL(pci_set_cacheline_size);
+
+#ifdef PCI_DISABLE_MWI
+int pci_set_mwi(struct pci_dev *dev)
+{
+ return 0;
+}
+
+int pci_try_set_mwi(struct pci_dev *dev)
+{
+ return 0;
+}
+
+void pci_clear_mwi(struct pci_dev *dev)
+{
+}
+
+#else
/**
* pci_set_mwi - enables memory-write-invalidate PCI transaction