From 4c1e9aa41b2f9afe8f26e2efe5bb4695f6c40772 Mon Sep 17 00:00:00 2001 From: David Milburn Date: Fri, 3 Apr 2009 15:36:41 -0500 Subject: libata: ahci enclosure management bios workaround During driver initialization ahci_start_port may not be able to turn LEDs off because the hardware may still be transmitting a message. And since the BIOS may not be setting the LEDs to off the drive LEDs may end up in a fault state. This has been seen on ICH9r and ICH10r when configured in AHCI mode instead of RAID mode, this patch doesn't key off a specific set of device IDs but will give the EM transmit bit a chance to clear if busy. Signed-off-by: David Milburn Signed-off-by: Jeff Garzik --- drivers/ata/ahci.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) (limited to 'drivers/ata/ahci.c') diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 788bba2b1e1..6ca4bc0fcae 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -78,6 +78,7 @@ static ssize_t ahci_led_store(struct ata_port *ap, const char *buf, static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state, ssize_t size); #define MAX_SLOTS 8 +#define MAX_RETRY 15 enum { AHCI_PCI_BAR = 5, @@ -1115,6 +1116,8 @@ static void ahci_start_port(struct ata_port *ap) struct ahci_port_priv *pp = ap->private_data; struct ata_link *link; struct ahci_em_priv *emp; + ssize_t rc; + int i; /* enable FIS reception */ ahci_start_fis_rx(ap); @@ -1126,7 +1129,17 @@ static void ahci_start_port(struct ata_port *ap) if (ap->flags & ATA_FLAG_EM) { ata_for_each_link(link, ap, EDGE) { emp = &pp->em_priv[link->pmp]; - ahci_transmit_led_message(ap, emp->led_state, 4); + + /* EM Transmit bit maybe busy during init */ + for (i = 0; i < MAX_RETRY; i++) { + rc = ahci_transmit_led_message(ap, + emp->led_state, + 4); + if (rc == -EBUSY) + udelay(100); + else + break; + } } } @@ -1331,7 +1344,7 @@ static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state, em_ctl = readl(mmio + HOST_EM_CTL); if (em_ctl & EM_CTL_TM) { spin_unlock_irqrestore(ap->lock, flags); - return -EINVAL; + return -EBUSY; } /* -- cgit v1.2.3