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hpsa: avoid unnecessary readl on every command submission

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for controllers which support either of the ioaccel transport methods.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Reviewed-by: Mike Miller <michael.miller@canonical.com>
Reviewed-by: Joe Handzik <joseph.t.handzik@hp.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Stephen M. Cameron
2014-05-29 10:53:23 -05:00
committed by Christoph Hellwig
parent 094963dad8
commit b3a52e791e
2 changed files with 21 additions and 1 deletions
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15
drivers/scsi/hpsa.h
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@@ -346,6 +346,12 @@ static void SA5_submit_command(struct ctlr_info *h,
(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
}
static void SA5_submit_command_no_read(struct ctlr_info *h,
struct CommandList *c)
{
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
}
static void SA5_submit_command_ioaccel2(struct ctlr_info *h,
struct CommandList *c)
{
@@ -353,7 +359,6 @@ static void SA5_submit_command_ioaccel2(struct ctlr_info *h,
writel(c->busaddr, h->vaddr + IOACCEL2_INBOUND_POSTQ_32);
else
writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
}
/*
@@ -564,6 +569,14 @@ static struct access_method SA5_performant_access = {
SA5_performant_completed,
};
static struct access_method SA5_performant_access_no_read = {
SA5_submit_command_no_read,
SA5_performant_intr_mask,
SA5_fifo_full,
SA5_performant_intr_pending,
SA5_performant_completed,
};
struct board_type {
u32 board_id;
char *product_name;