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| author | Mark Lord <liml@rtr.ca> | 2009-01-21 10:31:29 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2009-01-26 06:41:57 -0500 |
| commit | 6d3c30efc964fadf2e6270e6fceaeca3ce50027a (patch) | |
| tree | 555b60363b953a35836adf61ca0b5a4ca71e64a0 /drivers/ata | |
| parent | 5d0fb2e730e2085021cf5c8b6d14983e92aea75b (diff) | |
| download | linux-6d3c30efc964fadf2e6270e6fceaeca3ce50027a.tar.gz linux-6d3c30efc964fadf2e6270e6fceaeca3ce50027a.tar.bz2 linux-6d3c30efc964fadf2e6270e6fceaeca3ce50027a.zip | |
sata_mv: msi masking fix (v2)
Enable reliable use of Message-Signaled Interrupts (MSI) in sata_mv
by masking further chip interrupts within the main interrupt handler.
Based upon a suggestion by Grant Grundler.
MSI is working reliably in all of my test systems here now.
Signed-off-by: Mark Lord <mlord@pobox.com>
Reviewed-by: Grant Grundler <grundler@google.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/sata_mv.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 9e9fb9594781..f2d8a020ea53 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -33,8 +33,6 @@ * * --> ATAPI support (Marvell claims the 60xx/70xx chips can do it). * - * --> Investigate problems with PCI Message Signalled Interrupts (MSI). - * * --> Develop a low-power-consumption strategy, and implement it. * * --> [Experiment, low priority] Investigate interrupt coalescing. @@ -70,7 +68,7 @@ #include <linux/libata.h> #define DRV_NAME "sata_mv" -#define DRV_VERSION "1.24" +#define DRV_VERSION "1.25" enum { /* BAR's are enumerated in terms of pci_resource_start() terms */ @@ -2199,9 +2197,15 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance) struct ata_host *host = dev_instance; struct mv_host_priv *hpriv = host->private_data; unsigned int handled = 0; + int using_msi = hpriv->hp_flags & MV_HP_FLAG_MSI; u32 main_irq_cause, pending_irqs; spin_lock(&host->lock); + + /* for MSI: block new interrupts while in here */ + if (using_msi) + writel(0, hpriv->main_irq_mask_addr); + main_irq_cause = readl(hpriv->main_irq_cause_addr); pending_irqs = main_irq_cause & hpriv->main_irq_mask; /* @@ -2215,6 +2219,11 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance) handled = mv_host_intr(host, pending_irqs); } spin_unlock(&host->lock); + + /* for MSI: unmask; interrupt cause bits will retrigger now */ + if (using_msi) + writel(hpriv->main_irq_mask, hpriv->main_irq_mask_addr); + return IRQ_RETVAL(handled); } @@ -3417,9 +3426,9 @@ static int mv_pci_init_one(struct pci_dev *pdev, if (rc) return rc; - /* Enable interrupts */ - if (msi && pci_enable_msi(pdev)) - pci_intx(pdev, 1); + /* Enable message-switched interrupts, if requested */ + if (msi && pci_enable_msi(pdev) == 0) + hpriv->hp_flags |= MV_HP_FLAG_MSI; mv_dump_pci_cfg(pdev, 0x68); mv_print_info(host); |