Hello.
On 09/05/2013 04:54 PM, Alexander Gordeev wrote:
Do not trust the hardware and always check if MSI
Revert to Single Message mode was enforced. Fall
back to the single MSI mode in case it did. Not
doing so might screw up the interrupt handling.
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
drivers/ata/ahci.c | 16 ++++++++++++++++
drivers/ata/ahci.h | 1 +
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index a6bb618..af5d535 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1091,6 +1091,14 @@ static inline void ahci_gtf_filter_workaround(struct ata_host *host)
{}
#endif
+static int ahci_get_mrsm(struct ahci_host_priv *hpriv)
+{
+ void __iomem *mmio = hpriv->mmio;
+ u32 ctl = readl(mmio + HOST_CTL);
+
+ return (ctl & HOST_MRSM);
Parens not needed here, in case you'll respin this once more.
WBR, Sergei
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