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| author | Alexander Beregalov <a.beregalov@gmail.com> | 2009-04-15 00:00:54 +0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2009-06-10 15:50:17 +0400 |
| commit | f35b5e7c066a41f60683d2689e52a1336479913b (patch) | |
| tree | a12957566a5e09b43f5dae83803792b519e7cd7d | |
| parent | 2102d7497393e982bf38ffe8f5fd3d487104880d (diff) | |
| download | linux-f35b5e7c066a41f60683d2689e52a1336479913b.tar.xz | |
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>
| -rw-r--r-- | drivers/ata/sata_sx4.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c index eb05a3c82a9e..bbcf970068ad 100644 --- a/drivers/ata/sata_sx4.c +++ b/drivers/ata/sata_sx4.c @@ -193,6 +193,7 @@ enum { 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 @@ static unsigned int pdc20621_dimm_init(struct ata_host *host) { 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 @@ static unsigned int pdc20621_dimm_init(struct ata_host *host) 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; |