Re: [PATCH v2 3/5] PCI: iproc: Disable MSI parsing in certain PAXC blocks

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On 2018-06-12 22:28, Ray Jui wrote:
On 6/12/2018 1:29 AM, poza@xxxxxxxxxxxxxx wrote:
On 2018-06-12 05:51, Ray Jui wrote:
The internal MSI parsing logic in certain revisions of PAXC root
complexes does not work properly and can casue corruptions on the
writes. They need to be disabled

Signed-off-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
---
 drivers/pci/host/pcie-iproc.c | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 680f6b1..0804aa2 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -1197,10 +1197,22 @@ static int iproc_pcie_paxb_v2_msi_steer(struct
iproc_pcie *pcie, u64 msi_addr)
     return ret;
 }

-static void iproc_pcie_paxc_v2_msi_steer(struct iproc_pcie *pcie, u64 msi_addr) +static void iproc_pcie_paxc_v2_msi_steer(struct iproc_pcie *pcie, u64 msi_addr,
+                     bool enable)
 {
     u32 val;

+    if (!enable) {
+        /*
+         * Disable PAXC MSI steering. All write transfers will be
+         * treated as non-MSI transfers
+         */
+        val = iproc_pcie_read_reg(pcie, IPROC_PCIE_MSI_EN_CFG);
+        val &= ~MSI_ENABLE_CFG;
+        iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_EN_CFG, val);
+        return;
can be dropped.


No it cannot be dropped. Please review the code carefully.

Ahhh, my bad, it looked like a new function to me, may e I need sleep.
sorry about that.

Reviewed-by: Oza Pawandeep <poza@xxxxxxxxxxxxxx>






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