On Saturday, March 29, 2014 1:53 AM, Lucas Stach wrote:
>
> On i.MX6 the host controller MSI irq is shared
> with PCI legacy INTD. Make sure we don't bail too
> early from the irq handler.
>
> The issue is fairly theoretical as it would require
> a system setup with a PCIe switch where one connected
> device is using legacy INTD and another one using
> MSI, but better fix it now.
>
> Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
(+cc Mohit KUMAR DCG, Pratyush ANAND)
Acked-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
Best regards,
Jingoo Han
> ---
> drivers/pci/host/pci-exynos.c | 4 +---
> drivers/pci/host/pcie-designware.c | 6 +++++-
> drivers/pci/host/pcie-designware.h | 2 +-
> 3 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c
> index 3de6bfbbe8e9..b616d34922d8 100644
> --- a/drivers/pci/host/pci-exynos.c
> +++ b/drivers/pci/host/pci-exynos.c
> @@ -415,9 +415,7 @@ static irqreturn_t exynos_pcie_msi_irq_handler(int irq, void *arg)
> {
> struct pcie_port *pp = arg;
>
> - dw_handle_msi_irq(pp);
> -
> - return IRQ_HANDLED;
> + return dw_handle_msi_irq(pp);
> }
>
> static void exynos_pcie_msi_init(struct pcie_port *pp)
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 98c118e04dba..cbce9b04b13d 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -156,15 +156,17 @@ static struct irq_chip dw_msi_irq_chip = {
> };
>
> /* MSI int handler */
> -void dw_handle_msi_irq(struct pcie_port *pp)
> +irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
> {
> unsigned long val;
> int i, pos, irq;
> + irqreturn_t ret = IRQ_NONE;
>
> for (i = 0; i < MAX_MSI_CTRLS; i++) {
> dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
> (u32 *)&val);
> if (val) {
> + ret = IRQ_HANDLED;
> pos = 0;
> while ((pos = find_next_bit(&val, 32, pos)) != 32) {
> irq = irq_find_mapping(pp->irq_domain,
> @@ -177,6 +179,8 @@ void dw_handle_msi_irq(struct pcie_port *pp)
> }
> }
> }
> +
> + return ret;
> }
>
> void dw_pcie_msi_init(struct pcie_port *pp)
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index 3063b3594d88..a169d22d517e 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -68,7 +68,7 @@ struct pcie_host_ops {
>
> int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
> int dw_pcie_cfg_write(void __iomem *addr, int where, int size, u32 val);
> -void dw_handle_msi_irq(struct pcie_port *pp);
> +irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
> void dw_pcie_msi_init(struct pcie_port *pp);
> int dw_pcie_link_up(struct pcie_port *pp);
> void dw_pcie_setup_rc(struct pcie_port *pp);
> --
> 1.9.0
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