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Fri, 23 Jun 2023 07:41:10 -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 v6 3/5] PCI: brcmstb: Set higher value for internal bus timeout Date: Fri, 23 Jun 2023 10:40:56 -0400 Message-Id: <20230623144100.34196-4-james.quinlan@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230623144100.34196-1-james.quinlan@broadcom.com> References: <20230623144100.34196-1-james.quinlan@broadcom.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230623_154119_961626_56EF3DB5 X-CRM114-Status: GOOD ( 12.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7561057506834881903==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============7561057506834881903== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000f9e4c505feccfd8c" --000000000000f9e4c505feccfd8c During long periods of the PCIe RC HW being in an L1SS sleep state, there may be a timeout on an internal bus access, even though there may not be any PCIe access involved. Such a timeout will cause a subsequent CPU abort. So, when "brcm,enable-l1ss" is observed, we increase the timeout value to four seconds instead of using its HW default. Signed-off-by: Jim Quinlan Tested-by: Florian Fainelli --- drivers/pci/controller/pcie-brcmstb.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index d30636a725d7..fe0415a98c63 100644 --- a/drivers/pci/controller/pcie-brcmstb.c +++ b/drivers/pci/controller/pcie-brcmstb.c @@ -1034,6 +1034,21 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie) return 0; } +/* + * This extends the timeout period for an access to an internal bus. This + * access timeout may occur during L1SS sleep periods even without the + * presence of a PCIe access. + */ +static void brcm_extend_rbus_timeout(struct brcm_pcie *pcie) +{ + /* TIMEOUT register is two registers before RGR1_SW_INIT_1 */ + const unsigned int REG_OFFSET = PCIE_RGR1_SW_INIT_1(pcie) - 8; + u32 timeout_us = 4000000; /* 4 seconds, our setting for L1SS */ + + /* Each unit in timeout register is 1/216,000,000 seconds */ + writel(216 * timeout_us, pcie->base + REG_OFFSET); +} + static void brcm_config_clkreq(struct brcm_pcie *pcie) { bool l1ss = of_property_read_bool(pcie->np, "brcm,enable-l1ss"); @@ -1059,6 +1074,7 @@ static void brcm_config_clkreq(struct brcm_pcie *pcie) * of 400ns, as specified in 3.2.5.2.2 of the PCI Express * Mini CEM 2.0 specification. */ + brcm_extend_rbus_timeout(pcie); clkreq_set |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_L1SS_ENABLE_MASK; dev_info(pcie->dev, "bi-dir CLKREQ# for L1SS power savings"); } else { -- 2.17.1 --000000000000f9e4c505feccfd8c 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Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============7561057506834881903==--