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([2405:201:c40a:785d:2c0b:e596:ead5:2f45]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7724284fa02sm5689324b3a.102.2025.08.31.23.55.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 31 Aug 2025 23:56:08 -0700 (PDT) Message-ID: <3cbe6692-2ada-4034-8cb2-bc246bca5611@oss.qualcomm.com> Date: Mon, 1 Sep 2025 12:25:58 +0530 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 2/5] PCI: dwc: Add support for ELBI resource mapping To: Manivannan Sadhasivam Cc: cros-qcom-dts-watchers@chromium.org, Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , Jingoo Han , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, quic_vbadigan@quicinc.com, quic_mrana@quicinc.com, quic_vpernami@quicinc.com, mmareddy@quicinc.com References: <20250828-ecam_v4-v8-0-92a30e0fa02d@oss.qualcomm.com> <20250828-ecam_v4-v8-2-92a30e0fa02d@oss.qualcomm.com> Content-Language: en-US From: Krishna Chaitanya Chundru In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: U5zubFweFPnQrKLB5ud8Vh6VTdbSvdB2 X-Proofpoint-GUID: U5zubFweFPnQrKLB5ud8Vh6VTdbSvdB2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODMwMDAyMCBTYWx0ZWRfX2XPdpeeqPCDE +i9b7t5stmYGxpJAqj9gy3INEVgADmyLAalxOMtJheMjXH+dBu6labTo7WFd4uNlzOQ0c3zoQNu Qgv5WIj15c6RugMiqkTXqZvg6TzLE/X9JzMALIbisHIMw/EW7nP9+1N1yBV2KvschBRNUrLUjEC yTAW0Q52nbJR89iFrf4/cNwp0wMi9u/GaTyK1PQcrPAXTftITJlmHi4n+fLO/30gFyNJ+OWeAAj cfZzA5frRXMav4zZIio2gnzAzivcioBcH+XcwpcR2NP2GJtwEE8AazKwaJH/9reh1atq6lDD0SX wn0KcvHaM871xYGuCtdBsMJNW3+3Hi2fBXXUngGbP5XF/SOIrInagzRAVENBSlDJQdsqrmAiBzQ XyfjtUIG X-Authority-Analysis: v=2.4 cv=VNndn8PX c=1 sm=1 tr=0 ts=68b5438b cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=KKAkSRfTAAAA:8 a=EUspDBNiAAAA:8 a=8Rd1e7yjQrnBmPj41GQA:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-01_03,2025-08-28_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 clxscore=1015 adultscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508300020 On 8/31/2025 5:18 PM, Manivannan Sadhasivam wrote: > On Thu, Aug 28, 2025 at 01:04:23PM GMT, Krishna Chaitanya Chundru wrote: >> External Local Bus Interface(ELBI) registers are optional registers in >> DWC IPs having vendor specific registers. >> >> Since ELBI register space is applicable for all DWC based controllers, >> move the resource get code to DWC core and make it optional. >> >> Suggested-by: Manivannan Sadhasivam >> Reviewed-by: Manivannan Sadhasivam >> Signed-off-by: Krishna Chaitanya Chundru >> --- >> drivers/pci/controller/dwc/pcie-designware.c | 9 +++++++++ >> drivers/pci/controller/dwc/pcie-designware.h | 1 + >> 2 files changed, 10 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c >> index 89aad5a08928cc29870ab258d33bee9ff8f83143..4684c671a81bee468f686a83cc992433b38af59d 100644 >> --- a/drivers/pci/controller/dwc/pcie-designware.c >> +++ b/drivers/pci/controller/dwc/pcie-designware.c >> @@ -167,6 +167,15 @@ int dw_pcie_get_resources(struct dw_pcie *pci) >> } >> } >> >> + if (!pci->elbi_base) { > > Why this check is needed? Are we expecting any DWC glue drivers to supply > 'dw_pcie::elbi_base' on their own? > I was following the same way that existed for for dbi_base, where we are allowing DWC glue drivers to supply if they had any different approach like ./pci-dra7xx.c driver. - Krishna Chaitanya. > - Mani >