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Fri, 19 Jun 2026 06:11:48 -0700 (PDT) X-Received: by 2002:a05:6102:3311:b0:726:c60b:e9d3 with SMTP id ada2fe7eead31-72b16170536mr153044137.3.1781874708367; Fri, 19 Jun 2026 06:11:48 -0700 (PDT) Received: from [192.168.120.170] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c0a8490b104sm88203066b.14.2026.06.19.06.11.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Jun 2026 06:11:47 -0700 (PDT) Message-ID: Date: Fri, 19 Jun 2026 15:11:45 +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: [PATCH 0/6] arm64: dts: qcom: sc8280xp: set GPI DMA channels according to DSDT To: Icenowy Zheng , Pengyu Luo Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260602081451.3808833-1-zhengxingda@iscas.ac.cn> <178040480680.1778078.1165164069560552075.b4-review@b4> <178073773007.397244.9871455646149843167.b4-reply@b4> <7ecda3d0f91b0d96bcec44ddf485ed5146788220.camel@iscas.ac.cn> <178073918523.417326.15121723011916371966.b4-reply@b4> <1c33b1dd7d187b17b21b17339a4f1990e59d2f77.camel@iscas.ac.cn> <12a8cc4f-3c45-471b-8a0c-f7473cefa190@oss.qualcomm.com> <926a0fe9224d73e0f5e3f58f3769c6247b1cabd4.camel@iscas.ac.cn> <7ac67f89-c6b4-4e0c-8eec-1e5c757777ce@oss.qualcomm.com> <5621f70b-984e-4a65-add8-a9bf42e6c0c2@oss.qualcomm.com> <9434068bd7e69c92fed5382bff2479d4fc0e4bf4.camel@iscas.ac.cn> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <9434068bd7e69c92fed5382bff2479d4fc0e4bf4.camel@iscas.ac.cn> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: Rir6a_51t60vBi5fklCRO4a3_rWtRzHb X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE5MDEyNCBTYWx0ZWRfX0HWlsvwqiWwK DQbGqN7q4vU4yyEQ/Cw/tder0xEOZI4ZiPvKF921UliDJ8Pf6jav4Rpcu6BlbrlLSitnmSIe4KH PhOH1Pcj8y3GozsUNKx6wM85t6Ic9Gja0cKsIV7eLENIP/gqt+xAO3d2f0s4N8aIyV4UPbXUhRB IABJfVZrUsT6XFR1Zitha5KPW0lxzMvlhUcZicocXJAqMSoNSrkWgaGEMlVGfvWmhbBOhVjM2bP eC97Dxd42wlFXggLD6D43rxyeOBmBm6nsJ0E6DtYPvRFp49gTEArAGA42Th+Pr1lQoEHTZnTMo3 z1SkT8n9aRWwLHaFRH9kR1zevCpA1XLYQOm5XaA0ESZzvyy9odm3SQ/cMOrzyh7YHPVY23EsAZe kuHPhpGont0U7RvCAZGLbG2UKiiMVjguiJui07Mpw0GiFOXwhhqzT+P1bIMiH5MgJS0pTTHwgyU /gr0mrUrm0kqeu/R3lw== X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE5MDEyNCBTYWx0ZWRfX9kT/DWI/qwHm lU0//XbhCrWwP1rFrZbQy/4bB3U7cZQzR0o0lfD7lK8YozOdfJu648j1TSxnBWFFoR2bMvpyzJ5 Kv6vTUYLf1Cop4cHrUGmgIW0bQCb4kA= X-Proofpoint-ORIG-GUID: Rir6a_51t60vBi5fklCRO4a3_rWtRzHb X-Authority-Analysis: v=2.4 cv=KbzidwYD c=1 sm=1 tr=0 ts=6a354015 cx=c_pps a=DUEm7b3gzWu7BqY5nP7+9g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=fGO4tVQLAAAA:8 a=6gIg4Y3sYP9ApIHZztMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=-aSRE8QhW-JAV6biHavz:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-19_02,2026-06-18_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 spamscore=0 impostorscore=0 adultscore=0 phishscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606190124 On 6/19/26 2:50 PM, Icenowy Zheng wrote: > 在 2026-06-19五的 14:27 +0200，Konrad Dybcio写道： >> On 6/18/26 12:34 PM, Icenowy Zheng wrote: >>> 在 2026-06-18四的 11:05 +0200，Konrad Dybcio写道： >>>> On 6/18/26 11:04 AM, Konrad Dybcio wrote: >>>>> On 6/9/26 5:54 PM, Icenowy Zheng wrote: >>>>>> 在 2026-06-09二的 14:23 +0200，Konrad Dybcio写道： >>>>>>> On 6/7/26 10:49 AM, Icenowy Zheng wrote: >>>>>>>> 在 2026-06-06六的 21:51 +0800，Pengyu Luo写道： >>>>>>>>> On Sat, Jun 6, 2026 at 9:21 PM Icenowy Zheng >>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>> 在 2026-06-06六的 17:46 +0800，Pengyu Luo写道： >>>>>>>>>>> On 2026-06-06 17:28:35+08:00, Icenowy Zheng wrote: >>>>>>>>>>>> 在 2026-06-06六的 17:22 +0800，Pengyu Luo写道： >>>>>>>>>>>> >>>>>>>>>>>>> On 2026-06-02 21:21:27+08:00, Icenowy Zheng >>>>>>>>>>>>> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>> The magnetic keyboard (USB HID) can't be >>>>>>>>>>>>> connected >>>>>>>>>>>>> somehow, >>>>>>>>>>>>> others >>>>>>>>>>>>> are >>>>>>>>>>>>> fine, such as the spi touchscreen (not upstream >>>>>>>>>>>>> yet), >>>>>>>>>>>>> which >>>>>>>>>>>>> utilizes >>>>>>>>>>>>> DMA definitely. My config is here >>>>>>>>>>>>> https://pastebin.com/SdjuyJYk >>>>>>>>>>>> >>>>>>>>>>>> Is this a defconfig? >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Yes. >>>>>>>>>>> >>>>>>>>>>>> BTW it seems that CONFIG_ASYNC_TX_DMA needs to be >>>>>>>>>>>> selected >>>>>>>>>>>> too >>>>>>>>>>>> for >>>>>>>>>>>> exhibiting the problem (because there should be >>>>>>>>>>>> "public" >>>>>>>>>>>> GPI >>>>>>>>>>>> DMA >>>>>>>>>>>> consumers to trigger the stuck/reset). >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Is this still necessary? I checked the fedora >>>>>>>>>>> discussion and >>>>>>>>>>> your >>>>>>>>>>> GPI >>>>>>>>>>> DMA fix. And GPI DMA is only for the QUP-supported >>>>>>>>>>> peripherals as >>>>>>>>>>> the >>>>>>>>>>> binding mentioned, >>>>>>>>>>> devicetree/bindings/dma/qcom,gpi.yaml >>>>>>>>>> >>>>>>>>>> The devicetree without this fix seems to be still >>>>>>>>>> incorrect, >>>>>>>>>> because >>>>>>>>>> with the device tree fix even if the GPI DMA driver >>>>>>>>>> misbehaves >>>>>>>>>> the >>>>>>>>>> system won't be stuck (although it will iterate all >>>>>>>>>> GPI >>>>>>>>>> channels >>>>>>>>>> and >>>>>>>>>> then fail to function at all). >>>>>>>>>> >>>>>>>>> >>>>>>>>> Back to the start. You said some GPI interfaces aren't >>>>>>>>> available >>>>>>>>> to >>>>>>>>> HLOS, your mask is 0xb(0b1011), so I use 0x4(0b100) did >>>>>>>>> a >>>>>>>>> quick >>>>>>>>> test, >>>>>>>>> and spi6 consumed it, no stuck or reset. Could you give >>>>>>>>> me >>>>>>>>> a >>>>>>>>> unavailable channel? >>>>>>>> >>>>>>>> I think channel 0b10000 of gpi_dma2 could be an example? >>>>>>>> >>>>>>>> It seems that 4 channels are tried on gpi_dma2 before >>>>>>>> hang on >>>>>>>> my >>>>>>>> gaokun3, but as gaokun3 has no known serial access, it's >>>>>>>> possible >>>>>>>> that >>>>>>>> 0b100000 or 0b1000 is problematic. >>>>>>>> >>>>>>>> (The reason gpi_dma2 is checked first is because it's the >>>>>>>> GPI >>>>>>>> DMA >>>>>>>> controller with the smallest address) >>>>>>>> >>>>>>>> BTW I just took the values from Windows DSDT, which is >>>>>>>> quite >>>>>>>> conservative. >>>>>>> >>>>>>> So, with DMA_PRIVATE set, is this series made redundant? >>>>>> >>>>>> I assume technically the trustzone is still protecting some >>>>>> channels, >>>>>> although the system stuck issue is fixed. >>>>>> >>>>>> This series should still be relevant, although not so >>>>>> emergent. >>>>> >>>>> So now we're down to the case of the TZ reserving some of the >>>>> GPI >>>>> channels (presumably for locked down/TZ-driven QUPs) crashing >>>>> the >>>>> device on access, is that right? >>>> >>>> i.e. now, is requesting these channels through (wrongfully) >>>> enabling >>>> the devices in DT the only remaining concern? >>> >>> Yes, I think so; although I think few devices will use GPI on these >>> devices (usually only one or two SPI controllers according to the >>> DSDTs). >> >> IIRC there's a configuration table that lets OEMs decide which ones >> should fall under the secure umbrella (although most never seem to >> change the defaults). > > Ah then what's the default value? > > Radxa Dragon Q8B seems to have GPII0-5 enabled for all GPI controllers This matches what I can find in the default config Konrad