On Tue, 2020-05-19 at 16:34 -0400, Jim Quinlan wrote:
> From: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
>
> The proper value of the parameter SCB_MAX_BURST_SIZE varies
> per chip. The 2711 family requires 128B whereas other devices
> can employ 512. The assignment is complicated by the fact
> that the values for this two-bit field have different meanings;
>
> Value Type_Generic Type_7278
>
> 00 Reserved 128B
> 01 128B 256B
> 10 256B 512B
> 11 512B Reserved
>
> Signed-off-by: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
> ---
> drivers/pci/controller/pcie-brcmstb.c | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-brcmstb.c
> b/drivers/pci/controller/pcie-brcmstb.c
> index 7bf945efd71b..0dfa1bbd9764 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -53,7 +53,7 @@
> #define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
> #define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
> #define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
> -#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128 0x0
> +
> #define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
> #define PCIE_MISC_MISC_CTRL_SCB1_SIZE_MASK 0x07c00000
> #define PCIE_MISC_MISC_CTRL_SCB2_SIZE_MASK 0x0000001f
> @@ -276,6 +276,7 @@ struct brcm_pcie {
> int num_memc;
> u64 memc_size[PCIE_BRCM_MAX_MEMC];
> u32 hw_rev;
> + const struct of_device_id *of_id;
> };
>
> /*
> @@ -841,7 +842,7 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
> int num_out_wins = 0;
> u16 nlw, cls, lnksta;
> int i, ret, memc;
> - u32 tmp, aspm_support;
> + u32 tmp, burst, aspm_support;
>
> /* Reset the bridge */
> brcm_pcie_bridge_sw_init_set(pcie, 1);
> @@ -857,10 +858,20 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
> /* Wait for SerDes to be stable */
> usleep_range(100, 200);
>
> + /*
> + * SCB_MAX_BURST_SIZE is a two bit field. For GENERIC chips it
> + * is encoded as 0=128, 1=256, 2=512, 3=Rsvd, for BCM7278 it
> + * is encoded as 0=Rsvd, 1=128, 2=256, 3=512.
> + */
> + if (strcmp(pcie->of_id->compatible, "brcm,bcm2711-pcie") == 0)
Would it make sense to use pcie->type here? I know GENERIC != BCM2711, but we
could define it and avoid adding redundant info in struct brcm_pcie.
Regards,
Nicolas
> + burst = 0x0; /* 128B */
> + else
> + burst = (pcie->type == BCM7278) ? 0x3 : 0x2; /* 512 bytes */
> +
> /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
> u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK);
> u32p_replace_bits(&tmp, 1, PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK);
> - u32p_replace_bits(&tmp, PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_128,
> + u32p_replace_bits(&tmp, burst,
> PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK);
> writel(tmp, base + PCIE_MISC_MISC_CTRL);
>
> @@ -1200,6 +1211,7 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> pcie->reg_offsets = data->offsets;
> pcie->reg_field_info = data->reg_field_info;
> pcie->type = data->type;
> + pcie->of_id = of_id;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> pcie->base = devm_ioremap_resource(&pdev->dev, res);
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