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Wed, 02 Sep 2026 02:30:25 -0700 (PDT) X-Received: by 2002:a05:620a:40d5:b0:930:a08c:cf9c with SMTP id af79cd13be357-93960e262d0mr236212985a.2.1788341424949; Wed, 02 Sep 2026 02:30:24 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c25d9236caasm58370966b.27.2026.09.02.02.30.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Sep 2026 02:30:23 -0700 (PDT) Message-ID: <46625820-4890-41e9-8355-997fac0c43e2@oss.qualcomm.com> Date: Wed, 2 Sep 2026 11:30:21 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: (subset) [PATCH v8 0/5] PCI: dwc: Add ECAM support with iATU configuration To: Krishna Chaitanya Chundru , Bjorn Andersson , cros-qcom-dts-watchers@chromium.org, Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lorenzo Pieralisi , Manivannan Sadhasivam , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , Jingoo Han Cc: 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> <176160465177.73268.9869510926279916233.b4-ty@kernel.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=F8JnsKhN c=1 sm=1 tr=0 ts=6a97ecb2 cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=UULHRhTqb_eqUsvF39wA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-GUID: PH4yPfWljl7aZ6gQbf9e10EyR4QHBbgS X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAyMDA4MiBTYWx0ZWRfX3oF4P8LHqdX+ htGhGeSgFSorRSweab6AIE4Xfs1Ki4cQT/OPWZvp19WMkKN3HwWw3en86hwCYJe4vhafYmx+6xL 3moS6Ay5oL2fNFmp3M1U+miZJjtN1F0= X-Proofpoint-ORIG-GUID: PH4yPfWljl7aZ6gQbf9e10EyR4QHBbgS X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAyMDA4MiBTYWx0ZWRfX0IkpT+cuf/4m yZ1kLzueeeoPIL9Geijig4azAOq7mc6AXZ1GHDWqQ45slZFoGfhTl4mOK1oPbBcI30iFwUW6gx5 96EIcSXtj/LpHWUcptcwNle65WNtiJgojDDEa+gEPpFEekFMEmRWsjAnGSpgaxkC+OkQiiXCv1m Goy0AMy1kRu4yzwMBUsYH7ha6ePiw9MsT0xg8jvlwq/m1V/U3DTOBvHCK3O76M9rPPxQFDbJW8o fzPHqtDHFU7hBjbr96W8zY1pDGG75PESYha0p4YCaTmX5JW8weRSm/4/skSJKCj48FCMvg/0aR7 Jyg3zXA/WAoifCSSsOrLAbKLqjnzy2xtNesJ3p/mD7qFmLtWuHl3NaDgSiKLEB5bl1m8l6vCuls tHgcE5DBTou4mWcOcmvdTctWLiZydOqQCxY+oPF3sjK+D/CNo8FsEy32fIOX9JHj/J4RkqcyI/2 Nt0rQiQzCC7Y0kVfG+w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-02_02,2026-09-01_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 impostorscore=0 adultscore=0 malwarescore=0 suspectscore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609020082 On 10/28/25 6:42 PM, Krishna Chaitanya Chundru wrote: > > On 10/28/2025 4:07 AM, Bjorn Andersson wrote: >> On Thu, 28 Aug 2025 13:04:21 +0530, Krishna Chaitanya Chundru wrote: >>> The current implementation requires iATU for every configuration >>> space access which increases latency & cpu utilization. >>> >>> Designware databook 5.20a, section 3.10.10.3 says about CFG Shift Feature, >>> which shifts/maps the BDF (bits [31:16] of the third header DWORD, which >>> would be matched against the Base and Limit addresses) of the incoming >>> CfgRd0/CfgWr0 down to bits[27:12]of the translated address. >>> >>> [...] >> Applied, thanks! >> >> [1/5] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature >>        commit: 03e928442d469f7d8dafc549638730647202d9ce > > Hi Bjorn, > > Can you revert this change, this is regression due to this series due to that we have change the logic, > we need to update the dtsi accordingly, I will send a separate for all controllers to enable this ECAM feature. I was doing some unrelated work and came across this. The driver support has been merged a year ago now - let's plumb the missing pieces. Konrad