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authornbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2010-04-24 17:24:11 +0000
committernbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2010-04-24 17:24:11 +0000
commit1cb9c65242d16695313c52be66407c0bc96933f1 (patch)
tree4c8ef99cfe2b79147da482ac43356b028378d592 /target/linux
parentad35c2c69e946c8197d5125869e9e77730726b4e (diff)
ar71xx: fix a wifi card stability issue
when we receive a pci/ahb interrupt, we need to flush pending data for dma from the device, otherwise the tx path may get stuck if the completion flag of the dma descriptor is not updated at the time the tx interrupt arrives. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21143 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/ar71xx/files/arch/mips/ar71xx/irq.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/irq.c b/target/linux/ar71xx/files/arch/mips/ar71xx/irq.c
index eecdd9f714..4e1da167dd 100644
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/irq.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/irq.c
@@ -21,6 +21,8 @@
#include <asm/mach-ar71xx/ar71xx.h>
+static int ip2_flush_reg;
+
static void ar71xx_gpio_irq_dispatch(void)
{
void __iomem *base = ar71xx_gpio_base;
@@ -239,8 +241,17 @@ asmlinkage void plat_irq_dispatch(void)
if (pending & STATUSF_IP7)
do_IRQ(AR71XX_CPU_IRQ_TIMER);
- else if (pending & STATUSF_IP2)
+ else if (pending & STATUSF_IP2) {
+ /*
+ * This IRQ is meant for a PCI device. Drivers for PCI devices
+ * typically allocate coherent DMA memory for the descriptor
+ * ring, however the DMA controller may still have some
+ * unsynchronized data in the FIFO.
+ * Issue a flush here to ensure that the driver sees the update.
+ */
+ ar71xx_ddr_flush(ip2_flush_reg);
do_IRQ(AR71XX_CPU_IRQ_IP2);
+ }
else if (pending & STATUSF_IP4)
do_IRQ(AR71XX_CPU_IRQ_GE0);
@@ -260,6 +271,20 @@ asmlinkage void plat_irq_dispatch(void)
void __init arch_init_irq(void)
{
+ switch(ar71xx_soc) {
+ case AR71XX_SOC_AR7240:
+ case AR71XX_SOC_AR7241:
+ case AR71XX_SOC_AR7242:
+ ip2_flush_reg = AR724X_DDR_REG_FLUSH_PCIE;
+ break;
+ case AR71XX_SOC_AR9130:
+ case AR71XX_SOC_AR9132:
+ ip2_flush_reg = AR91XX_DDR_REG_FLUSH_WMAC;
+ break;
+ default:
+ ip2_flush_reg = AR71XX_DDR_REG_FLUSH_PCI;
+ break;
+ }
mips_cpu_irq_init();
ar71xx_misc_irq_init();