On Xen kernels, if ATC (address translation cache) is enabled, the
first PCIe DMA read from the adapter fails with an error. This is due to
a bug ASIC, which leads to a failure of 1860 ports to be initialised.
This patch includes the fix to disable Invalidated Tag Match Enable
capability by setting the bit 26 of CHIP_MISC_PRG to 0, by default it is
set to 1.
Signed-off-by: Anil Gurumurthy <aguru...@brocade.com>
Signed-off-by: Vijaya Mohan Guvva <vmo...@brocade.com>
---
drivers/scsi/bfa/bfa_ioc_ct.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/scsi/bfa/bfa_ioc_ct.c b/drivers/scsi/bfa/bfa_ioc_ct.c
index de4e726..a8e52a1 100644
--- a/drivers/scsi/bfa/bfa_ioc_ct.c
+++ b/drivers/scsi/bfa/bfa_ioc_ct.c
@@ -918,6 +918,16 @@ bfa_ioc_ct2_pll_init(void __iomem *rb, enum bfi_asic_mode
mode)
}
}
+ /*
+ * The very first PCIe DMA Read done by LPU fails with a fatal error,
+ * when Address Translation Cache (ATC) has been enabled by system BIOS.
+ *
+ * Workaround:
+ * Disable Invalidated Tag Match Enable capability by setting the bit 26
+ * of CHIP_MISC_PRG to 0, by default it is set to 1.
+ */
+ r32 = readl(rb + CT2_CHIP_MISC_PRG);
+ writel((r32 & 0xfbffffff), (rb + CT2_CHIP_MISC_PRG));
/*
* Mask the interrupts and clear any
--
1.7.12
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