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Wed, 03 Apr 2024 14:39:12 -0700 (PDT) Received: from stbsrv-and-01.and.broadcom.net ([192.19.144.250]) by smtp.gmail.com with ESMTPSA id pi10-20020a0562144a8a00b0069903cddc96sm1750739qvb.18.2024.04.03.14.39.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Apr 2024 14:39:11 -0700 (PDT) From: Jim Quinlan To: linux-pci@vger.kernel.org, Nicolas Saenz Julienne , Bjorn Helgaas , Lorenzo Pieralisi , Cyril Brulebois , Phil Elwell , bcm-kernel-feedback-list@broadcom.com, james.quinlan@broadcom.com Cc: Florian Fainelli , Jim Quinlan , Lorenzo Pieralisi , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Rob Herring , linux-rpi-kernel@lists.infradead.org (moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE), linux-arm-kernel@lists.infradead.org (moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v9 3/4] PCI: brcmstb: Set downstream maximum {no-}snoop LTR values Date: Wed, 3 Apr 2024 17:39:00 -0400 Message-Id: <20240403213902.26391-4-james.quinlan@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240403213902.26391-1-james.quinlan@broadcom.com> References: <20240403213902.26391-1-james.quinlan@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000b4ef960615380d8c" Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: --000000000000b4ef960615380d8c Most of our systems do not have FW or ACPI, so it is up to the RC driver to set the maximum LTR {no-}snoop latency values of downstream devices. We set them to a value that is slightly smaller than the value of our internal bus timeout register. Signed-off-by: Jim Quinlan --- drivers/pci/controller/pcie-brcmstb.c | 68 ++++++++++++++++++++++++++- 1 file changed, 66 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index e3480ca4cd57..3d08b92d5bb8 100644 --- a/drivers/pci/controller/pcie-brcmstb.c +++ b/drivers/pci/controller/pcie-brcmstb.c @@ -182,6 +182,20 @@ #define DATA_ADDR(pcie) (pcie->reg_offsets[EXT_CFG_DATA]) #define PCIE_RGR1_SW_INIT_1(pcie) (pcie->reg_offsets[RGR1_SW_INIT_1]) +/* + * What we call "LTR_FMT" is the 16 bit latency field format: + * [15:15] Requirement bit + * [12:10] Latency scale + * [09:00] Latency value + */ +#define LTR_FMT_TO_NS(p) (FIELD_GET(GENMASK(15, 15), (p)) \ + * ((unsigned long long)FIELD_GET(GENMASK(9, 0), (p)) \ + << (FIELD_GET(GENMASK(12, 10), (p)) * 5))) +#define BRCM_LTR_MAX_SCALE 4 /* Scale==4 => Each unit is 1,048,576ns */ +#define BRCM_LTR_MAX_VALUE 9 /* Using the above scale, roughly 9.4 ms */ +#define BRCM_LTR_MAX_NS ((unsigned long long)(BRCM_LTR_MAX_VALUE \ + << (5 * BRCM_LTR_MAX_SCALE))) + /* Rescal registers */ #define PCIE_DVT_PMU_PCIE_PHY_CTRL 0xc700 #define PCIE_DVT_PMU_PCIE_PHY_CTRL_DAST_NFLDS 0x3 @@ -679,6 +693,49 @@ static void brcm_extend_internal_bus_timeout(struct brcm_pcie *pcie, u32 nsec) writel(216 * timeout_us, pcie->base + REG_OFFSET); } +/* Sets downstream device latency tolerance registers to max we can handle */ +static int brcm_set_dev_ltr_max(struct pci_dev *dev, void *data) +{ + u16 ltr_cap_offset = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR); + u16 ltr_fmt_cur, ltr_fmt = *(u16 *)data; + unsigned long long cur_nsec; + static const u16 reg_offsets[2] = { + PCI_LTR_MAX_SNOOP_LAT, + PCI_LTR_MAX_NOSNOOP_LAT, + }; + unsigned int i; + + if (!ltr_cap_offset || !dev->ltr_path) + return 0; + + /* + * FW may have already written a value so we want to respect that + * value if it is lower than ltr_fmt. Update the current value if + * it is 0 or if the new value is less than the current. + */ + for (i = 0; i < ARRAY_SIZE(reg_offsets); i++) { + pci_read_config_word(dev, ltr_cap_offset + reg_offsets[i], + <r_fmt_cur); + cur_nsec = LTR_FMT_TO_NS(ltr_fmt_cur); + if (cur_nsec == 0 || cur_nsec > BRCM_LTR_MAX_NS) + pci_write_config_word(dev, ltr_cap_offset + + reg_offsets[i], ltr_fmt); + } + + return 0; +} + +void brcm_set_downstream_devs_ltr_max(struct brcm_pcie *pcie) +{ + struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie); + u16 ltr_fmt = FIELD_PREP(GENMASK(9, 0), BRCM_LTR_MAX_VALUE) + | FIELD_PREP(GENMASK(12, 10), BRCM_LTR_MAX_SCALE) + | GENMASK(15, 15); + + if (bridge->native_ltr) + pci_walk_bus(bridge->bus, brcm_set_dev_ltr_max, <r_fmt); +} + /* The controller is capable of serving in both RC and EP roles */ static bool brcm_pcie_rc_mode(struct brcm_pcie *pcie) { @@ -1074,8 +1131,12 @@ static int brcm_pcie_start_link(struct brcm_pcie *pcie) return -ENODEV; } - /* Extend internal bus timeout to 8ms or so */ - brcm_extend_internal_bus_timeout(pcie, SZ_8M); + /* + * Extend internal bus timeout to 8-10ms, specifically to a value + * that is slightly larger than what we are using for the max + * {no-}snoop latency we will set in downstream devices. + */ + brcm_extend_internal_bus_timeout(pcie, BRCM_LTR_MAX_NS + 1000); if (pcie->gen) brcm_pcie_set_gen(pcie, pcie->gen); @@ -1616,6 +1677,9 @@ static int brcm_pcie_probe(struct platform_device *pdev) return ret; } + if (IS_ENABLED(CONFIG_PCIEASPM)) + brcm_set_downstream_devs_ltr_max(pcie); + return 0; fail: -- 2.17.1 --000000000000b4ef960615380d8c Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQbgYJKoZIhvcNAQcCoIIQXzCCEFsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3FMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD 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