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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b87023a8a33sm538070066b.18.2026.01.12.03.29.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Jan 2026 03:29:29 -0800 (PST) Message-ID: <816456c5-ad32-4829-ae0d-a0d09f468863@oss.qualcomm.com> Date: Mon, 12 Jan 2026 12:29:26 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] PCI: dwc: Add support for retaining link during host init To: Bjorn Helgaas , Krishna Chaitanya Chundru Cc: Vinod Koul , Neil Armstrong , Philipp Zabel , Jingoo Han , Manivannan Sadhasivam , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org References: <20260109155350.GA546142@bhelgaas> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260109155350.GA546142@bhelgaas> X-Authority-Analysis: v=2.4 cv=auO/yCZV c=1 sm=1 tr=0 ts=6964db1b cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=sQDjRcaqkbB8EtgPkRQA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-GUID: KkZOcEllblSH7Ete-1Xy0tGxajc-vnCh X-Proofpoint-ORIG-GUID: KkZOcEllblSH7Ete-1Xy0tGxajc-vnCh X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTEyMDA5MSBTYWx0ZWRfX32OlDwV+echN kYtIY3YUZgu6qSRszs32hWPOUIATDItiupGhgcrUYlE6V4GO6aYpx3nJnaldpBUNUtEewmIX6U/ N+n7JOfK+toMHS2raqOU1nVWN+ENjPge7HHrGv3uvrREj2cPf+B3pCssCNfxsm4O11qxcbtZ4Ql 8Odrdp/JuFjfpDm2iFuVCfREAzgZUx9LW1ZGtCFaxbMADZaXMGgUA9XjXMunK5KtwU7SD92y2bk X5f2on/lQUjO0A4kU+BZZr2/B5ApDKAiWHma7uh2xRFz757/fmxbAdZE+WRRe5jy6iP8LcgHF4J IrirsG7FVPrMNhRU25OV07ocsvYgbWfLXLK5BS6aigiq9rmNwZKv7ar6Jok/bmcIi8dlgsfc8HC azry95XjfgQtlI8Rt87X2U0RbY+KG09QKHPV888lKAl6AsWcSKby6xvKy8q6NjV6ZjGbD2SeZe7 7mdg5VHu6zLq4vAm8rQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-12_03,2026-01-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 clxscore=1015 malwarescore=0 adultscore=0 spamscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601120091 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260112_032932_105148_49B894B8 X-CRM114-Status: GOOD ( 13.92 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 1/9/26 4:53 PM, Bjorn Helgaas wrote: > On Fri, Jan 09, 2026 at 12:51:07PM +0530, Krishna Chaitanya Chundru wrote: >> Some platforms keep the PCIe link up across bootloader and kernel >> handoff. In such cases, reinitializing the root complex is unnecessary >> if the DWC glue drivers wants to retain the PCIe link. >> >> Introduce a link_retain flag in struct dw_pcie_rp to indicate that >> the link should be preserved. When this flag is set by DWC glue drivers, >> skip dw_pcie_setup_rc() and only initialize MSI, avoiding redundant >> configuration steps. > > It sounds like this adds an assumption that the bootloader > initialization is the same as what dw_pcie_setup_rc() would do. This > assumption also applies to future changes in dw_pcie_setup_rc(). > > It looks like you mention an issue like this in [PATCH 4/5]; DBI & ATU > base being different than "HLOS" (whatever that is). This sounds like FYI, "HLOS" is a Qualcomm term for "High-Level OS".. which is a very pedantic way to say "OS" Konrad -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy