On 16/01/2019 23:43, Niklas Cassel wrote:
> On Tue, Jan 15, 2019 at 09:24:37AM +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>>
>> The patch below does not apply to the 4.14-stable tree.
>> If someone wants it applied there, or to any other stable or longterm
>> tree, then please email the backport, including the original git commit
>> id to <stable@xxxxxxxxxxxxxxx>.
>
> Hello Marc,
>
> You said that you were going to backport this to 4.14, right?
Me, or anyone else. Preferably someone who, like you, has the HW at hand (I don't).
> IIRC, you said something about creating a simple dw_pci_bottom_ack()
> (since 4.14 lacks a ack() function).
Indeed. Something like this:
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index bc3e2d8d0cce..f4f3eeee10af 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -45,8 +45,19 @@ static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
return dw_pcie_write(pci->dbi_base + where, size, val);
}
+static void dwc_irq_ack(struct irq_data *d)
+{
+ struct msi_desc *msi = irq_data_get_msi_desc(d);
+ struct pcie_port *pp = msi_desc_to_pci_sysdata(msi);
+ int pos = d->hwirq % 32;
+ int i = d->hwirq / 32;
+
+ dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4, BIT(pos));
+}
+
static struct irq_chip dw_msi_irq_chip = {
.name = "PCI-MSI",
+ .irq_ack = dwc_irq_ack,
.irq_enable = pci_msi_unmask_irq,
.irq_disable = pci_msi_mask_irq,
.irq_mask = pci_msi_mask_irq,
@@ -72,8 +83,6 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
pos)) != 32) {
irq = irq_find_mapping(pp->irq_domain, i * 32 + pos);
generic_handle_irq(irq);
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12,
- 4, 1 << pos);
pos++;
}
}
All I can say is that it compiles.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
