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

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Message-ID: <ccdc6924-c35f-4a29-fabb-587271fc929c@opensource.wdc.com>
Date:   Wed, 15 Feb 2023 11:38:48 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Rick Wertenbroek <rick.wertenbroek@...il.com>,
        alberto.dassatti@...g-vd.ch
Cc:     xxm@...k-chips.com, rick.wertenbroek@...g-vd.ch,
        stable@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Mikko Kovanen <mikko.kovanen@...amobile.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 7/9] PCI: rockchip: Fix legacy IRQ generation for
 RK3399 PCIe endpoint core

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@...r.kernel.org
> Signed-off-by: Rick Wertenbroek <rick.wertenbroek@...il.com>
> ---
>  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