From 85009239477a9b0b06d068d6ead9226d5c809a82 Mon Sep 17 00:00:00 2001 From: "Stephen M. Cameron" Date: Mon, 23 Sep 2013 13:33:36 -0500 Subject: [PATCH] [SCSI] hpsa: add 5 second delay after doorbell reset The hardware guys tell us that after initiating a software reset via the doorbell register we need to wait 5 seconds before attempting to talk to the board *at all*. This means that we cannot watch the board to verify it transitions from "ready" to to "not ready" then back "ready", since this transition will most likely happen during those 5 seconds (though we can still verify the reset happens by watching the "driver version" field get cleared.) Signed-off-by: Stephen M. Cameron Signed-off-by: James Bottomley --- drivers/scsi/hpsa.c | 32 +++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index c3db9bb1c235..2a71ab903d96 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -3785,6 +3785,13 @@ static int hpsa_controller_hard_reset(struct pci_dev *pdev, */ dev_info(&pdev->dev, "using doorbell to reset controller\n"); writel(use_doorbell, vaddr + SA5_DOORBELL); + + /* PMC hardware guys tell us we need a 5 second delay after + * doorbell reset and before any attempt to talk to the board + * at all to ensure that this actually works and doesn't fall + * over in some weird corner cases. + */ + msleep(5000); } else { /* Try to do it the PCI power state way */ /* Quoting from the Open CISS Specification: "The Power @@ -3981,15 +3988,22 @@ static int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev) need a little pause here */ msleep(HPSA_POST_RESET_PAUSE_MSECS); - /* Wait for board to become not ready, then ready. */ - dev_info(&pdev->dev, "Waiting for board to reset.\n"); - rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY); - if (rc) { - dev_warn(&pdev->dev, - "failed waiting for board to reset." - " Will try soft reset.\n"); - rc = -ENOTSUPP; /* Not expected, but try soft reset later */ - goto unmap_cfgtable; + if (!use_doorbell) { + /* Wait for board to become not ready, then ready. + * (if we used the doorbell, then we already waited 5 secs + * so the "not ready" state is already gone by so we + * won't catch it.) + */ + dev_info(&pdev->dev, "Waiting for board to reset.\n"); + rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_NOT_READY); + if (rc) { + dev_warn(&pdev->dev, + "failed waiting for board to reset." + " Will try soft reset.\n"); + /* Not expected, but try soft reset later */ + rc = -ENOTSUPP; + goto unmap_cfgtable; + } } rc = hpsa_wait_for_board_state(pdev, vaddr, BOARD_READY); if (rc) { -- 2.11.0