Commit 39f25e70 authored Feb 21, 2008 by Mark Lord Committed by Jeff Garzik Feb 24, 2008

libata-pmp: clear hob for pmp register accesses

>> Mark Lord wrote:
>>> Tejun, I've added PMP to sata_mv, and am now trying to get it
>>> to work with a Marvell PM attached.
>>>
>>> And the behaviour I see is very bizarre.
>>>
>>> After hard+soft resets, the PM signature is found,
>>> and libata interrogates the PM registers.
>>>
>>> It successfully reads register 0, and then register 1.
>>> But all subsequent registers read out (incorrectly) as zeros.
...

This behavior has been confirmed by Marvell with a SATA analyzer.
The Marvell port-multiplier apparently likes to see clean HOB
information when accessing PMP registers.

Since sata_mv uses PIO shadow register access, this doesn't happen
automatically, as it might in a more purely FIS-based driver (eg. ahci).

One way to fix this is to flag these commands with ATA_TFLAG_LBA48,
forcing libata to write out the HOB fields with known (zero) values.

Signed-off-by: Saeed Bishara <saeed@marvell.com>
Acked-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

parent 91163006

drivers/ata/libata-pmp.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -35,7 +35,7 @@ static unsigned int sata_pmp_read(struct ata_link link, int reg, u32 r_val)
		ata_tf_init(pmp_dev, &tf);
		tf.command = ATA_CMD_PMP_READ;
		tf.protocol = ATA_PROT_NODATA;
		tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE;
		tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE \| ATA_TFLAG_LBA48;
		tf.feature = reg;
		tf.device = link->pmp;

		@@ -71,7 +71,7 @@ static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
		ata_tf_init(pmp_dev, &tf);
		tf.command = ATA_CMD_PMP_WRITE;
		tf.protocol = ATA_PROT_NODATA;
		tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE;
		tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE \| ATA_TFLAG_LBA48;
		tf.feature = reg;
		tf.device = link->pmp;
		tf.nsect = val & 0xff;