redonkable/alistair23-linux
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[ARM] pxa/zeus: relax memory timings on Zeus ethernet ports

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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>
This commit is contained in:
Marc Zyngier 2009-12-26 21:24:12 +01:00 committed by Eric Miao
parent 100627b4ba
commit 5f86cebaa5
1 changed files with 10 additions and 1 deletions
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11
arch/arm/mach-pxa/zeus.c
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@ -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));