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authorPaul Mundt <lethal@linux-sh.org>2010-09-19 13:57:51 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-09-19 13:57:51 +0900
commit81df84f4060f4f19c7e6f39c7c527a6098436a2a (patch)
tree617779f42664440d4787bbdd028a205f17bc825a /arch/sh/drivers
parentbdf7499081fc3c521d0f8fc28c6950c7c9bd7e97 (diff)
downloadlinux-81df84f4060f4f19c7e6f39c7c527a6098436a2a.tar.bz2
sh: pci: Give SH7786 PHY some time to settle.
The spec suggests waiting up to 500ms for the PHY to settle before testing link state, but practice shows that 100ms is sufficient (this is the delay value we also use on the other SH-4A PCI controllers, too). This makes device detection much more reliable, although in the future it should be a bit faster to simply serialize with a TLP IRQ. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/drivers')
-rw-r--r--arch/sh/drivers/pci/pcie-sh7786.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/pcie-sh7786.c b/arch/sh/drivers/pci/pcie-sh7786.c
index 5ae58ec025c8..4e6cf8804979 100644
--- a/arch/sh/drivers/pci/pcie-sh7786.c
+++ b/arch/sh/drivers/pci/pcie-sh7786.c
@@ -312,6 +312,9 @@ static int pcie_init(struct sh7786_pcie_port *port)
data |= 0x1;
pci_write_reg(chan, data, SH4A_PCIETCTLR);
+ /* Let things settle down a bit.. */
+ mdelay(100);
+
/* Enable DL_Active Interrupt generation */
data = pci_read_reg(chan, SH4A_PCIEDLINTENR);
data |= PCIEDLINTENR_DLL_ACT_ENABLE;