Re: [PATCH v2 7/9] PCI: rockchip: Fix legacy IRQ generation for RK3399 PCIe endpoint core

[Damien Le Moal]

On 2/14/23 23:08, Rick Wertenbroek wrote:
> Fix legacy IRQ generation for RK3399 PCIe endpoint core according to
> the technical reference manual (TRM). Assert and deassert legacy
> interrupt (INTx) through the legacy interrupt control register
> ("PCIE_CLIENT_LEGACY_INT_CTRL") instead of manually generating a PCIe
> message. The generation of the legacy interrupt was tested and validated
> with the PCIe endpoint test driver.
> 
> Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Rick Wertenbroek <rick.wertenbroek@xxxxxxxxx>
> ---
>  drivers/pci/controller/pcie-rockchip-ep.c | 38 +++++------------------
>  drivers/pci/controller/pcie-rockchip.h    |  6 ++++
>  2 files changed, 14 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
> index cbc281a6a..ca5b363ba 100644
> --- a/drivers/pci/controller/pcie-rockchip-ep.c
> +++ b/drivers/pci/controller/pcie-rockchip-ep.c
> @@ -328,45 +328,23 @@ static void rockchip_pcie_ep_assert_intx(struct rockchip_pcie_ep *ep, u8 fn,
>  					 u8 intx, bool is_asserted)
>  {
>  	struct rockchip_pcie *rockchip = &ep->rockchip;
> -	u32 r = ep->max_regions - 1;
> -	u32 offset;
> -	u32 status;
> -	u8 msg_code;
> -
> -	if (unlikely(ep->irq_pci_addr != ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR ||
> -		     ep->irq_pci_fn != fn)) {
> -		rockchip_pcie_prog_ep_ob_atu(rockchip, fn, r,
> -					     AXI_WRAPPER_NOR_MSG,
> -					     ep->irq_phys_addr, 0, 0);
> -		ep->irq_pci_addr = ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR;

By the way, ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR is now unused. Remove it
too please.

-- 
Damien Le Moal
Western Digital Research