sata_sx4: speed up ECC initialization
ECC initialization takes too long. It writes zeroes by portions
of 4 byte, it takes more than 6 minutes on my machine to initialize
512Mb ECC DIMM module. Change portion to 128Kb - it significantly
reduces initialization time.
Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
index eb05a3c..bbcf970 100644
--- a/drivers/ata/sata_sx4.c
+++ b/drivers/ata/sata_sx4.c
@@ -193,6 +193,7 @@
PDC_TIMER_MASK_INT,
};
+#define ECC_ERASE_BUF_SZ (128 * 1024)
struct pdc_port_priv {
u8 dimm_buf[(ATA_PRD_SZ * ATA_MAX_PRD) + 512];
@@ -1280,7 +1281,6 @@
{
int speed, size, length;
u32 addr, spd0, pci_status;
- u32 tmp = 0;
u32 time_period = 0;
u32 tcount = 0;
u32 ticks = 0;
@@ -1395,14 +1395,17 @@
pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
PDC_DIMM_SPD_TYPE, &spd0);
if (spd0 == 0x02) {
+ void *buf;
VPRINTK("Start ECC initialization\n");
addr = 0;
length = size * 1024 * 1024;
+ buf = kzalloc(ECC_ERASE_BUF_SZ, GFP_KERNEL);
while (addr < length) {
- pdc20621_put_to_dimm(host, (void *) &tmp, addr,
- sizeof(u32));
- addr += sizeof(u32);
+ pdc20621_put_to_dimm(host, buf, addr,
+ ECC_ERASE_BUF_SZ);
+ addr += ECC_ERASE_BUF_SZ;
}
+ kfree(buf);
VPRINTK("Finish ECC initialization\n");
}
return 0;