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Wed, 03 Jul 2024 11:03:21 -0700 (PDT) Received: from stbsrv-and-01.and.broadcom.net ([192.19.144.250]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b59e5f1a6dsm55589626d6.83.2024.07.03.11.03.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jul 2024 11:03:20 -0700 (PDT) From: Jim Quinlan To: linux-pci@vger.kernel.org, Nicolas Saenz Julienne , Bjorn Helgaas , Lorenzo Pieralisi , Cyril Brulebois , Stanimir Varbanov , bcm-kernel-feedback-list@broadcom.com, jim2101024@gmail.com, james.quinlan@broadcom.com Cc: Florian Fainelli , Lorenzo Pieralisi , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Rob Herring , Philipp Zabel , 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 v2 10/12] PCI: brcmstb: Check return value of all reset_control_xxx calls Date: Wed, 3 Jul 2024 14:02:54 -0400 Message-Id: <20240703180300.42959-11-james.quinlan@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240703180300.42959-1-james.quinlan@broadcom.com> References: <20240703180300.42959-1-james.quinlan@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000680fdf061c5ba5e7" Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: --000000000000680fdf061c5ba5e7 In some cases the result of a reset_control_xxx() call have been ignored. Now we check all return values of such functions and at the least issue a dev_err(...) message if the return value is not zero. Signed-off-by: Jim Quinlan --- drivers/pci/controller/pcie-brcmstb.c | 33 ++++++++++++++++++++------- 1 file changed, 25 insertions(+), 8 deletions(-) diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index 5f632fdc0052..1c3ce0c182d1 100644 --- a/drivers/pci/controller/pcie-brcmstb.c +++ b/drivers/pci/controller/pcie-brcmstb.c @@ -743,11 +743,16 @@ static void __iomem *brcm7425_pcie_map_bus(struct pci_bus *bus, static void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val) { + int ret; + if (pcie->bridge) { if (val) - reset_control_assert(pcie->bridge); + ret = reset_control_assert(pcie->bridge); else - reset_control_deassert(pcie->bridge); + ret = reset_control_deassert(pcie->bridge); + if (ret) + dev_err(pcie->dev, "failed to %s 'bridge' reset, err=%d\n", + val ? "assert" : "deassert", ret); } else { u32 tmp, mask = RGR1_SW_INIT_1_INIT_GENERIC_MASK; u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT; @@ -770,13 +775,20 @@ static void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val) static void brcm_pcie_perst_set_4908(struct brcm_pcie *pcie, u32 val) { + int ret; + if (WARN_ONCE(!pcie->perst_reset, "missing PERST# reset controller\n")) return; if (val) - reset_control_assert(pcie->perst_reset); + ret = reset_control_assert(pcie->perst_reset); else - reset_control_deassert(pcie->perst_reset); + ret = reset_control_deassert(pcie->perst_reset); + + if (ret) + dev_err(pcie->dev, "failed to %s 'perst' reset, err=%d\n", + val ? "assert" : "deassert", ret); + } static void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val) @@ -1460,7 +1472,7 @@ static int brcm_pcie_suspend_noirq(struct device *dev) { struct brcm_pcie *pcie = dev_get_drvdata(dev); struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie); - int ret; + int ret, rret; brcm_pcie_turn_off(pcie); /* @@ -1491,7 +1503,10 @@ static int brcm_pcie_suspend_noirq(struct device *dev) pcie->sr->supplies); if (ret) { dev_err(dev, "Could not turn off regulators\n"); - reset_control_reset(pcie->rescal); + rret = reset_control_reset(pcie->rescal); + if (rret) + dev_err(dev, "failed to reset 'rascal' controller ret=%d\n", + rret); return ret; } } @@ -1506,7 +1521,7 @@ static int brcm_pcie_resume_noirq(struct device *dev) struct brcm_pcie *pcie = dev_get_drvdata(dev); void __iomem *base; u32 tmp; - int ret; + int ret, rret; base = pcie->base; ret = clk_prepare_enable(pcie->clk); @@ -1568,7 +1583,9 @@ static int brcm_pcie_resume_noirq(struct device *dev) if (pcie->sr) regulator_bulk_disable(pcie->sr->num_supplies, pcie->sr->supplies); err_reset: - reset_control_rearm(pcie->rescal); + rret = reset_control_rearm(pcie->rescal); + if (rret) + dev_err(pcie->dev, "failed to rearm 'rescal' reset, err=%d\n", rret); err_disable_clk: clk_disable_unprepare(pcie->clk); return ret; -- 2.17.1 --000000000000680fdf061c5ba5e7 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 VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS 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