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Sun, 22 Dec 2024 22:51:43 -0800 (PST) X-Google-Smtp-Source: AGHT+IG3Eevay4cFpBOZVpfqRhKjBVEV/hQa4faos0PEeOW7zqFrwQ+g3KW2ARs1mbw6xpw+YV7mDQ== X-Received: by 2002:a17:90b:5245:b0:2ee:d958:1b18 with SMTP id 98e67ed59e1d1-2f452f01c34mr14869492a91.36.1734936702884; Sun, 22 Dec 2024 22:51:42 -0800 (PST) Received: from hu-krichai-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-219dc9f4413sm66570155ad.172.2024.12.22.22.51.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Dec 2024 22:51:42 -0800 (PST) From: Krishna Chaitanya Chundru Date: Mon, 23 Dec 2024 12:21:16 +0530 Subject: [PATCH v3 3/4] PCI: dwc: Improve handling of PCIe lane configuration Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241223-preset_v2-v3-3-a339f475caf5@oss.qualcomm.com> References: <20241223-preset_v2-v3-0-a339f475caf5@oss.qualcomm.com> In-Reply-To: <20241223-preset_v2-v3-0-a339f475caf5@oss.qualcomm.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Helgaas , Jingoo Han , Manivannan Sadhasivam , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, konrad.dybcio@oss.qualcomm.com, quic_mrana@quicinc.com, quic_vbadigan@quicinc.com, Bjorn Andersson , Konrad Dybcio , Krishna Chaitanya Chundru X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1734936683; l=3448; i=krishna.chundru@oss.qualcomm.com; s=20230907; h=from:subject:message-id; bh=5rxRkPnumzzfAdemdZBFDf4pCGC4z3dLReWUJOLysOk=; b=drL2ws+ekg+rOEN2EVcQ1pdTOuJQRBj/bcvcwDRYsyjofzJvw6CLCHfF4MwD0uTP7SNSAYHbU 6K0Q/nsao9xDp7HKpXRtGxBFuIQbpsdVoekFT9GlMpHFH7Ktk0yNqsb X-Developer-Key: i=krishna.chundru@oss.qualcomm.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-Proofpoint-ORIG-GUID: OecXssmK46m1jDzI6G0TmKE9w_By75bk X-Proofpoint-GUID: OecXssmK46m1jDzI6G0TmKE9w_By75bk X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 impostorscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 malwarescore=0 spamscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412230059 Currently even if the number of lanes hardware supports is equal to the number lanes provided in the devicetree, the driver is trying to configure again the maximum number of lanes which is not needed. Update number of lanes only when it is not equal to hardware capability. And also if the num-lanes property is not present in the devicetree update the num_lanes with the maximum hardware supports. Introduce dw_pcie_link_get_max_link_width() to get the maximum lane width the hardware supports. Signed-off-by: Krishna Chaitanya Chundru --- drivers/pci/controller/dwc/pcie-designware-host.c | 3 +++ drivers/pci/controller/dwc/pcie-designware.c | 14 +++++++++++++- drivers/pci/controller/dwc/pcie-designware.h | 1 + 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 3e41865c7290..2cd0acbf9e18 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -504,6 +504,9 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) dw_pcie_iatu_detect(pci); + if (pci->num_lanes < 1) + pci->num_lanes = dw_pcie_link_get_max_link_width(pci); + /* * Allocate the resource for MSG TLP before programming the iATU * outbound window in dw_pcie_setup_rc(). Since the allocation depends diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 6d6cbc8b5b2c..acb2a963ae1a 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -736,6 +736,16 @@ static void dw_pcie_link_set_max_speed(struct dw_pcie *pci) } +int dw_pcie_link_get_max_link_width(struct dw_pcie *pci) +{ + u32 lnkcap; + u8 cap; + + cap = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + lnkcap = dw_pcie_readl_dbi(pci, cap + PCI_EXP_LNKCAP); + return FIELD_GET(PCI_EXP_LNKCAP_MLW, lnkcap); +} + static void dw_pcie_link_set_max_link_width(struct dw_pcie *pci, u32 num_lanes) { u32 lnkcap, lwsc, plc; @@ -1069,6 +1079,7 @@ void dw_pcie_edma_remove(struct dw_pcie *pci) void dw_pcie_setup(struct dw_pcie *pci) { + int num_lanes = dw_pcie_link_get_max_link_width(pci); u32 val; dw_pcie_link_set_max_speed(pci); @@ -1102,5 +1113,6 @@ void dw_pcie_setup(struct dw_pcie *pci) val |= PORT_LINK_DLL_LINK_EN; dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val); - dw_pcie_link_set_max_link_width(pci, pci->num_lanes); + if (num_lanes != pci->num_lanes) + dw_pcie_link_set_max_link_width(pci, pci->num_lanes); } diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 347ab74ac35a..500e793c9361 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -486,6 +486,7 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val); int dw_pcie_link_up(struct dw_pcie *pci); void dw_pcie_upconfig_setup(struct dw_pcie *pci); int dw_pcie_wait_for_link(struct dw_pcie *pci); +int dw_pcie_link_get_max_link_width(struct dw_pcie *pci); int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, const struct dw_pcie_ob_atu_cfg *atu); int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,