| Message ID | 1484997072-19276-2-git-send-email-bharatku@xilinx.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 21/01/17 11:11, Bharat Kumar Gogada wrote: > - Few wifi end points which only support legacy interrupts, > performs hardware reset functionalities after disabling interrupts > by invoking disable_irq and then re-enable using enable_irq, they > enable hardware interrupts first and then virtual irq line later. > - The legacy irq line goes low only after DEASSERT_INTx is > received.As the legacy irq line is high immediately after hardware > interrupts are enabled but virq of EP is still in disabled state > and EP handler is never executed resulting no DEASSERT_INTx.If dummy > irq chip is used, interrutps are not masked and system is > hanging with CPU stall. > - Adding irq chip functions instead of dummy irq chip for legacy > interrupts. > > Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com> > --- > drivers/pci/host/pcie-xilinx-nwl.c | 36 +++++++++++++++++++++++++++++++++++- > 1 files changed, 35 insertions(+), 1 deletions(-) > > diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c > index c8b5a33..e1809f9 100644 > --- a/drivers/pci/host/pcie-xilinx-nwl.c > +++ b/drivers/pci/host/pcie-xilinx-nwl.c > @@ -396,10 +396,44 @@ static void nwl_pcie_msi_handler_low(struct irq_desc *desc) > chained_irq_exit(chip, desc); > } > > +static void nwl_mask_leg_irq(struct irq_data *data) > +{ > + struct irq_desc *desc = irq_to_desc(data->irq); > + struct nwl_pcie *pcie; > + unsigned int mask = 0; No need for this initialization. And if the function you're passing that to takes a u32, why isn't that a u32 too? > + > + pcie = irq_desc_get_chip_data(desc); > + mask = 1 << (data->hwirq - 1); > + nwl_bridge_writel(pcie, ((u32)MSGF_LEG_SR_MASKALL & (~mask)), > + MSGF_LEG_MASK); Erm. This looks completely bogus. Let's say I mask INTA: mask = 1 << 0; nwl_bridge_writel(pcie, INTD|INTC|INTB, ...); Now, in a separate context, I decide to mask INTB: mask = 1 << 1; nwl_bridge_writel(pcie, INTD|INTC|INTA, ...); unmasking INTA in the process. Probably not what you intended. > + > +} > + > +static void nwl_unmask_leg_irq(struct irq_data *data) > +{ > + struct irq_desc *desc = irq_to_desc(data->irq); > + struct nwl_pcie *pcie; > + unsigned int mask = 0; > + > + pcie = irq_desc_get_chip_data(desc); > + mask = 1 << (data->hwirq - 1); > + nwl_bridge_writel(pcie, ((u32)MSGF_LEG_SR_MASKALL | mask), > + MSGF_LEG_MASK); Same issue. > + > +} > + > +static struct irq_chip nwl_leg_irq_chip = { > + .name = "nwl_pcie:legacy", > + .irq_enable = nwl_unmask_leg_irq, > + .irq_disable = nwl_mask_leg_irq, > + .irq_mask = nwl_mask_leg_irq, > + .irq_unmask = nwl_unmask_leg_irq, > +}; > + > static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq, > irq_hw_number_t hwirq) > { > - irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); > + irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_simple_irq); > irq_set_chip_data(irq, domain->host_data); > > return 0; > Thanks, M.
> On 21/01/17 11:11, Bharat Kumar Gogada wrote: > > - Few wifi end points which only support legacy interrupts, > > performs hardware reset functionalities after disabling interrupts > > by invoking disable_irq and then re-enable using enable_irq, they > > enable hardware interrupts first and then virtual irq line later. > > - The legacy irq line goes low only after DEASSERT_INTx is > > received.As the legacy irq line is high immediately after hardware > > interrupts are enabled but virq of EP is still in disabled state > > and EP handler is never executed resulting no DEASSERT_INTx.If dummy > > irq chip is used, interrutps are not masked and system is > > hanging with CPU stall. > > - Adding irq chip functions instead of dummy irq chip for legacy > > interrupts. > > > > Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com> > > --- > > drivers/pci/host/pcie-xilinx-nwl.c | 36 > +++++++++++++++++++++++++++++++++++- > > 1 files changed, 35 insertions(+), 1 deletions(-) > > > > diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx- > nwl.c > > index c8b5a33..e1809f9 100644 > > --- a/drivers/pci/host/pcie-xilinx-nwl.c > > +++ b/drivers/pci/host/pcie-xilinx-nwl.c > > @@ -396,10 +396,44 @@ static void nwl_pcie_msi_handler_low(struct > irq_desc *desc) > > chained_irq_exit(chip, desc); > > } > > > > +static void nwl_mask_leg_irq(struct irq_data *data) > > +{ > > + struct irq_desc *desc = irq_to_desc(data->irq); > > + struct nwl_pcie *pcie; > > + unsigned int mask = 0; > > No need for this initialization. And if the function you're passing that > to takes a u32, why isn't that a u32 too? > > > + > > + pcie = irq_desc_get_chip_data(desc); > > + mask = 1 << (data->hwirq - 1); > > + nwl_bridge_writel(pcie, ((u32)MSGF_LEG_SR_MASKALL & (~mask)), > > + MSGF_LEG_MASK); > > Erm. This looks completely bogus. Let's say I mask INTA: > > mask = 1 << 0; > nwl_bridge_writel(pcie, INTD|INTC|INTB, ...); > > Now, in a separate context, I decide to mask INTB: > > mask = 1 << 1; > nwl_bridge_writel(pcie, INTD|INTC|INTA, ...); > > unmasking INTA in the process. Probably not what you intended. > Agreed, will do it in next patch. > > + > > +} > > + > > +static void nwl_unmask_leg_irq(struct irq_data *data) > > +{ > > + struct irq_desc *desc = irq_to_desc(data->irq); > > + struct nwl_pcie *pcie; > > + unsigned int mask = 0; > > + > > + pcie = irq_desc_get_chip_data(desc); > > + mask = 1 << (data->hwirq - 1); > > + nwl_bridge_writel(pcie, ((u32)MSGF_LEG_SR_MASKALL | mask), > > + MSGF_LEG_MASK); > > Same issue. > Agreed, will do it in next patch. Thanks & Regards, Bharat -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c index c8b5a33..e1809f9 100644 --- a/drivers/pci/host/pcie-xilinx-nwl.c +++ b/drivers/pci/host/pcie-xilinx-nwl.c @@ -396,10 +396,44 @@ static void nwl_pcie_msi_handler_low(struct irq_desc *desc) chained_irq_exit(chip, desc); } +static void nwl_mask_leg_irq(struct irq_data *data) +{ + struct irq_desc *desc = irq_to_desc(data->irq); + struct nwl_pcie *pcie; + unsigned int mask = 0; + + pcie = irq_desc_get_chip_data(desc); + mask = 1 << (data->hwirq - 1); + nwl_bridge_writel(pcie, ((u32)MSGF_LEG_SR_MASKALL & (~mask)), + MSGF_LEG_MASK); + +} + +static void nwl_unmask_leg_irq(struct irq_data *data) +{ + struct irq_desc *desc = irq_to_desc(data->irq); + struct nwl_pcie *pcie; + unsigned int mask = 0; + + pcie = irq_desc_get_chip_data(desc); + mask = 1 << (data->hwirq - 1); + nwl_bridge_writel(pcie, ((u32)MSGF_LEG_SR_MASKALL | mask), + MSGF_LEG_MASK); + +} + +static struct irq_chip nwl_leg_irq_chip = { + .name = "nwl_pcie:legacy", + .irq_enable = nwl_unmask_leg_irq, + .irq_disable = nwl_mask_leg_irq, + .irq_mask = nwl_mask_leg_irq, + .irq_unmask = nwl_unmask_leg_irq, +}; + static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq, irq_hw_number_t hwirq) { - irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); + irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_simple_irq); irq_set_chip_data(irq, domain->host_data); return 0;
- Few wifi end points which only support legacy interrupts, performs hardware reset functionalities after disabling interrupts by invoking disable_irq and then re-enable using enable_irq, they enable hardware interrupts first and then virtual irq line later. - The legacy irq line goes low only after DEASSERT_INTx is received.As the legacy irq line is high immediately after hardware interrupts are enabled but virq of EP is still in disabled state and EP handler is never executed resulting no DEASSERT_INTx.If dummy irq chip is used, interrutps are not masked and system is hanging with CPU stall. - Adding irq chip functions instead of dummy irq chip for legacy interrupts. Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com> --- drivers/pci/host/pcie-xilinx-nwl.c | 36 +++++++++++++++++++++++++++++++++++- 1 files changed, 35 insertions(+), 1 deletions(-)