Work around for host bridges that generate fast back to back transactions

which the current version of the quad span cards do not advertise support for.


git-svn-id: http://svn.digium.com/svn/zaptel/branches/1.4@4122 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 12 insertions, 0 deletions

diff --git a/kernel/wct4xxp/base.c b/kernel/wct4xxp/base.c
index 0877371..45e030c 100644
--- a/kernel/wct4xxp/base.c
+++ b/kernel/wct4xxp/base.c
@@ -411,6 +411,13 @@ static struct t4 *cards[MAX_T4_CARDS];
 static inline unsigned int __t4_pci_in(struct t4 *wc, const unsigned int addr)
 {
 	unsigned int res = readl(&wc->membase[addr]);
+	if (pedanticpci) {
+		/* Even though we do not support fast back-to-back
+		 * transactions, some host bridges appear to generate them.
+		 * This delay prevents this. 
+		 */
+		udelay(3);
+	}
 	return res;
 }
 
@@ -419,6 +426,11 @@ static inline void __t4_pci_out(struct t4 *wc, const unsigned int addr, const un
 	unsigned int tmp;
 	writel(value, &wc->membase[addr]);
 	if (pedanticpci) {
+		/* Even though we do not support fast back-to-back
+		 * transactions, some host bridges appear to generate them.
+		 * This delay prevents this. 
+		 */
+		udelay(3);
 		tmp = __t4_pci_in(wc, WC_VERSION);
 		if ((tmp & 0xffff0000) != 0xc01a0000)
 			printk("TE4XXP: Version Synchronization Error!\n");