| Message ID | 1509371843-22931-9-git-send-email-mmaddireddy@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Mon, Oct 30, 2017 at 07:27:19PM +0530, Manikanta Maddireddy wrote: > Set required bit to have LTSSM wait for DLLP to finish before entering L1 > or L2. This avoids truncation of PM messages which results in receiver > errors. > > Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> > --- > V3: > * no change in this patch > V2: > * no change in this patch > > drivers/pci/host/pci-tegra.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c > index c264037112cb..34740a7033f7 100644 > --- a/drivers/pci/host/pci-tegra.c > +++ b/drivers/pci/host/pci-tegra.c > @@ -219,6 +219,9 @@ > #define RP_VEND_CTL1 0xf48 > #define RP_VEND_CTL1_ERPT (1 << 13) > > +#define RP_VEND_XP_BIST 0xf4c > +#define RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE (1 << 28) > + > #define RP_VEND_CTL2 0x00000fa8 > #define RP_VEND_CTL2_PCA_ENABLE (1 << 7) > > @@ -2162,6 +2165,13 @@ static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port) > value |= RP_VEND_XP_OPPORTUNISTIC_ACK; > value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC; > writel(value, port->base + RP_VEND_XP); > + > + /* LTSSM will wait for DLLP to finish before entering L1 or L2, > + * to avoid truncation of PM messages which results in receiver errors > + */ Block comment style, please. I'm still not sure if tegra_pcie_apply_sw_fixup() is a good name for this, even it's now becoming clear why you have a separate function. These aren't really SW fixups, are they? Why not stash these into the tegra_pcie_enable_rp_features() function? Thierry
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index c264037112cb..34740a7033f7 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -219,6 +219,9 @@ #define RP_VEND_CTL1 0xf48 #define RP_VEND_CTL1_ERPT (1 << 13) +#define RP_VEND_XP_BIST 0xf4c +#define RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE (1 << 28) + #define RP_VEND_CTL2 0x00000fa8 #define RP_VEND_CTL2_PCA_ENABLE (1 << 7) @@ -2162,6 +2165,13 @@ static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port) value |= RP_VEND_XP_OPPORTUNISTIC_ACK; value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC; writel(value, port->base + RP_VEND_XP); + + /* LTSSM will wait for DLLP to finish before entering L1 or L2, + * to avoid truncation of PM messages which results in receiver errors + */ + value = readl(port->base + RP_VEND_XP_BIST); + value |= RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE; + writel(value, port->base + RP_VEND_XP_BIST); } /* * FIXME: If there are no PCIe cards attached, then calling this function
Set required bit to have LTSSM wait for DLLP to finish before entering L1 or L2. This avoids truncation of PM messages which results in receiver errors. Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> --- V3: * no change in this patch V2: * no change in this patch drivers/pci/host/pci-tegra.c | 10 ++++++++++ 1 file changed, 10 insertions(+)