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Commit f35b5e7c authored by Alexander Beregalov's avatar Alexander Beregalov Committed by Jeff Garzik
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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: default avatarAlexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 2102d749

drivers/ata/sata_sx4.c

+7 −4
Original line number Diff line number Diff line
@@ -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;