[ARM] pxa/zeus: relax memory timings on Zeus ethernet ports

DM9000s on Zeus sometime fail under heavy load.
Relaxing the timings a bit seems to be of a great help.

Signed-off-by: Marc Zyngier <maz@misterjones.org>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/arch/arm/mach-pxa/zeus.c b/arch/arm/mach-pxa/zeus.c
index 865df5d840e7..2f480a2b1531 100644
--- a/arch/arm/mach-pxa/zeus.c
+++ b/arch/arm/mach-pxa/zeus.c
@@ -726,9 +726,18 @@ static mfp_cfg_t zeus_pin_config[] __initdata = {
         GPIO99_GPIO,            /* CF RDY */
 };
 
+/*
+ * DM9k MSCx settings:  SRAM, 16 bits
+ *                      17 cycles delay first access
+ *                       5 cycles delay next access
+ *                      13 cycles recovery time
+ *                      faster device
+ */
+#define DM9K_MSC_VALUE          0xe4c9
+
 static void __init zeus_init(void)
 {
-        u16 dm9000_msc = 0xe279;
+        u16 dm9000_msc = DM9K_MSC_VALUE;
 
         system_rev = __raw_readw(ZEUS_CPLD_VERSION);
         pr_info("Zeus CPLD V%dI%d\n", (system_rev & 0xf0) >> 4, (system_rev & 0x0f));