On Wed, Oct 21, 2015 at 06:52:51PM +1100, Michael Ellerman wrote:

On Wed, 2015-10-21 at 15:17 +0800, Wei Yang wrote:

quoted

Count of M64 BAR would differ with the evolution of hardware.

This patch retieves this count from device node instead of a hard coded
value.

Signed-off-by: Wei Yang <redacted>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 5c65d8f..4635d25 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c

@@ -368,6 +368,7 @@ static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
 	struct resource *res;
 	const u32 *r;
 	u64 pci_addr;
+	const __be32 *prop32;
 
 	/* FIXME: Support M64 for P7IOC */
 	if (phb->type != PNV_PHB_IODA2) {

@@ -402,7 +403,11 @@ static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
 			res->start, res->end, pci_addr);
 
 	/* Use last M64 BAR to cover M64 window */
-	phb->ioda.m64_bar_idx = 15;
+	prop32 = of_get_property(dn, "ibm,opal-m64-count", NULL);
+	if (prop32)
+		phb->ioda.m64_bar_idx = be32_to_cpup(prop32) - 1;
+	else
+		phb->ioda.m64_bar_idx = 15;

Please use of_property_read_u32() instead of using of_get_property() directly.

Also the "-1" is a bit unclear, I think it would be clearer if you did
something like:

if (of_property_read_u32(dn, "ibm,opal-m64-count", &count))
	count = 16;

/* Use last M64 BAR to cover M64 window */
phb->ioda.m64_bar_idx = count - 1;

Ok, thanks for the suggestion :-)

cheers

-- 
Richard Yang
Help you, Help me