From b3a52e791efd341a9a4e9065c667041c822661f0 Mon Sep 17 00:00:00 2001 From: "Stephen M. Cameron" Date: Thu, 29 May 2014 10:53:23 -0500 Subject: hpsa: avoid unnecessary readl on every command submission for controllers which support either of the ioaccel transport methods. Signed-off-by: Stephen M. Cameron Reviewed-by: Mike Miller Reviewed-by: Joe Handzik Signed-off-by: Christoph Hellwig --- drivers/scsi/hpsa.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'drivers/scsi/hpsa.h') diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index 6da9a9f4b749..0a5d91c4ded8 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -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; -- cgit