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Commit cdcca89e authored by Brett Russ's avatar Brett Russ Committed by Jeff Garzik
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[PATCH] libata: flush COMRESET set and clear 



Updated patch to fix erroneous flush of COMRESET set and missing flush
of COMRESET clear.  Created a new routine scr_write_flush() to try to
prevent this in the future.  Also, this patch is based on libata-2.6
instead of the previous libata-dev-2.6 based patch.

Signed-off-by: default avatarBrett Russ <russb@emc.com>

Index: libata-2.6/drivers/scsi/libata-core.c
===================================================================
parent 21b1ed74

drivers/scsi/libata-core.c

+3 −3
Original line number Diff line number Diff line
@@ -1253,11 +1253,11 @@ void __sata_phy_reset(struct ata_port *ap) 
	unsigned long timeout = jiffies + (HZ * 5);



	if (ap->flags & ATA_FLAG_SATA_RESET) {

		scr_write(ap, SCR_CONTROL, 0x301); /* issue phy wake/reset */

		scr_read(ap, SCR_STATUS);	/* dummy read; flush */

		/* issue phy wake/reset */

		scr_write_flush(ap, SCR_CONTROL, 0x301);

		udelay(400);			/* FIXME: a guess */

	}

	scr_write(ap, SCR_CONTROL, 0x300);	/* issue phy wake/clear reset */

	scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */



	/* wait for phy to become ready, if necessary */

	do {

include/linux/libata.h

+7 −0
Original line number Diff line number Diff line
@@ -584,6 +584,13 @@ static inline void scr_write(struct ata_port *ap, unsigned int reg, u32 val) 
	ap->ops->scr_write(ap, reg, val);

}



static inline void scr_write_flush(struct ata_port *ap, unsigned int reg, 

				   u32 val)

{

	ap->ops->scr_write(ap, reg, val);

	(void) ap->ops->scr_read(ap, reg);

}



static inline unsigned int sata_dev_present(struct ata_port *ap)

{

	return ((scr_read(ap, SCR_STATUS) & 0xf) == 0x3) ? 1 : 0;