linux-kernel - Re: [PATCH v4 3/8] PCI: armada8k: Add AC5 MSI support

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Message-ID: <20230322232313.zbxhodgfqeoyclbg@mobilestation>
Date:   Thu, 23 Mar 2023 02:23:13 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Elad Nachman <enachman@...vell.com>
Cc:     thomas.petazzoni@...tlin.com, bhelgaas@...gle.com,
        lpieralisi@...nel.org, robh@...nel.org, kw@...ux.com,
        krzysztof.kozlowski+dt@...aro.org, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yuval Shaia <yshaia@...vell.com>
Subject: Re: [PATCH v4 3/8] PCI: armada8k: Add AC5 MSI support

On Mon, Mar 13, 2023 at 02:40:11PM +0200, Elad Nachman wrote:
> From: Yuval Shaia <yshaia@...vell.com>
> 
> AC5 requires different handling for MSI as with armada8k.
> Fix it by:
> 
> 1. Enabling the relevant bits in init phase
> 2. Dispatch virtual IRQ handlers when MSI interrupts are received
> 
> Also enable/disable PCIE_APP_LTSSM for AC5.
> 
> Signed-off-by: Yuval Shaia <yshaia@...vell.com>
> Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
> ---
> v4:
>    Fix commit subject to be aligned with previous patch in series
> 
> v2:
>    1) fix W1 warnings which caused by unused leftover code
> 
>    2) fix type in "requieres" word in the description
> 
>  drivers/pci/controller/dwc/pcie-armada8k.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c
> index b9fb1375dc58..02481ecadd25 100644
> --- a/drivers/pci/controller/dwc/pcie-armada8k.c
> +++ b/drivers/pci/controller/dwc/pcie-armada8k.c
> @@ -50,6 +50,7 @@ struct armada8k_pcie_of_data {
>  
>  #define PCIE_GLOBAL_CONTROL_REG		(PCIE_VENDOR_REGS_OFFSET + 0x0)
>  #define PCIE_APP_LTSSM_EN		BIT(2)
> +#define PCIE_APP_LTSSM_EN_AC5		BIT(24)
>  #define PCIE_DEVICE_TYPE_SHIFT		4
>  #define PCIE_DEVICE_TYPE_MASK		0xF
>  #define PCIE_DEVICE_TYPE_RC		0x4 /* Root complex */
> @@ -69,6 +70,7 @@ struct armada8k_pcie_of_data {
>  #define PCIE_INT_B_ASSERT_MASK_AC5	BIT(13)
>  #define PCIE_INT_C_ASSERT_MASK_AC5	BIT(14)
>  #define PCIE_INT_D_ASSERT_MASK_AC5	BIT(15)
> +#define PCIE_MSI_MASK_AC5		BIT(11)
>  
>  #define PCIE_ATU_ACCESS_MASK_AC5	GENMASK(21, 20)
>  
> @@ -184,6 +186,16 @@ static int armada8k_pcie_start_link(struct dw_pcie *pci)
>  	return 0;
>  }
>  
> +static void ac5_pcie_msi_init(struct dw_pcie *pci)
> +{
> +	u32 val;
> +
> +	/* Set MSI bit in interrupt mask */
> +	val = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG);
> +	val |= PCIE_MSI_MASK_AC5;
> +	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG, val);
> +}
> +
>  static int armada8k_pcie_host_init(struct dw_pcie_rp *pp)
>  {
>  	u32 reg;
> @@ -193,7 +205,10 @@ static int armada8k_pcie_host_init(struct dw_pcie_rp *pp)
>  	if (!dw_pcie_link_up(pci)) {
>  		/* Disable LTSSM state machine to enable configuration */
>  		reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);

> -		reg &= ~(PCIE_APP_LTSSM_EN);
> +		if (pcie->pcie_type == ARMADA8K_PCIE_TYPE_AC5)
> +			reg &= ~(PCIE_APP_LTSSM_EN_AC5);
> +		else
> +			reg &= ~(PCIE_APP_LTSSM_EN);

This has nothing to do with MSIs.

-Serge(y)

>  		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
>  	}
>  
> @@ -233,6 +248,9 @@ static int armada8k_pcie_host_init(struct dw_pcie_rp *pp)
>  		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG, reg);
>  	}
>  
> +	if (IS_ENABLED(CONFIG_PCI_MSI) && (pcie->pcie_type == ARMADA8K_PCIE_TYPE_AC5))
> +		ac5_pcie_msi_init(pci);
> +
>  	return 0;
>  }
>  
> @@ -249,6 +267,8 @@ static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
>  	 */
>  	val = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_INT_CAUSE1_REG);
>  	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_CAUSE1_REG, val);
> +	if ((PCIE_MSI_MASK_AC5 & val) && (pcie->pcie_type == ARMADA8K_PCIE_TYPE_AC5))
> +		dw_handle_msi_irq(&pci->pp);
>  
>  	return IRQ_HANDLED;
>  }
> -- 
> 2.17.1
> 
>