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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-65b2da1aceasm1112696a12.19.2026.02.12.04.05.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Feb 2026 04:05:22 -0800 (PST) Message-ID: Date: Thu, 12 Feb 2026 13:05:20 +0100 Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/4] soc: qcom: ice: Remove platform_driver support and expose as a pure library To: Manivannan Sadhasivam Cc: manivannan.sadhasivam@oss.qualcomm.com, Bjorn Andersson , Konrad Dybcio , Abel Vesa , Adrian Hunter , Ulf Hansson , "James E.J. Bottomley" , "Martin K. Petersen" , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-scsi@vger.kernel.org, Sumit Garg , stable@vger.kernel.org, Abel Vesa References: <20260210-qcom-ice-fix-v2-0-9c1ab5d6502c@oss.qualcomm.com> <20260210-qcom-ice-fix-v2-1-9c1ab5d6502c@oss.qualcomm.com> <7d61d324-0d26-47ce-aac6-d17abdcf05cd@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=cd7fb3DM c=1 sm=1 tr=0 ts=698dc205 cx=c_pps a=7E5Bxpl4vBhpaufnMqZlrw==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=EUspDBNiAAAA:8 a=FGFzfvMP8PCZN11w_dYA:9 a=QEXdDO2ut3YA:10 a=pJ04lnu7RYOZP9TFuWaZ:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEyMDA5MCBTYWx0ZWRfXzAlnFqwF9K7Y UpWYsDHxKKULZAhMMB3Mkb3I+623a5+by3WavcGxQid1osXlVS7kbukQqzd8dzn2bpi4pU+XECK 5ZmFi7w4nI6DFnPLg59JMQOv30cS5aYMLL83zvSj9+zS3dxKaTuY4YWHfTr5Bfo9V4TmajEJs40 TNR812WtJuj/L3A0YcX/PIFE7DTaJSUmNOqf/I7L0R05KDx1WAn5ZYsE6PZZ5xfpPuAPshfSbup Z2iVtmqH3G0y7pmCjkRSJ31XchXQlmbBKa79Hx78c15Fyl7i5mRG5cvouX7g0QOXm0Vy/nMUsJW DqEhZ0UL7wu8GO8GXNbActYGfrjqszyfZ1hFdrLejJ6OQPqXPr2iPP5GTKGcMqnMpNKKK5bkbAW IUfVZievO1yhvhdSktcLVvIstoeUOuIY4NPHe2MSKovGKeXhQcbfAb2X5XZsAz7h5n+iVEX43iZ bUjhIeSSX9wE3RZnowQ== X-Proofpoint-GUID: Azv7KrgpqOQ6K-Q8SvtQiXYyf_cWIkvH X-Proofpoint-ORIG-GUID: Azv7KrgpqOQ6K-Q8SvtQiXYyf_cWIkvH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-12_03,2026-02-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 phishscore=0 adultscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602120090 On 2/10/26 1:19 PM, Manivannan Sadhasivam wrote: > On Tue, Feb 10, 2026 at 10:39:54AM +0100, Konrad Dybcio wrote: >> On 2/10/26 7:56 AM, Manivannan Sadhasivam via B4 Relay wrote: >>> From: Manivannan Sadhasivam >>> >>> The current platform driver design causes probe ordering races with >>> consumers (UFS, eMMC) due to ICE's dependency on SCM firmware calls. If ICE >>> probe fails (missing ICE SCM or DT registers), devm_of_qcom_ice_get() loops >>> with -EPROBE_DEFER, leaving consumers non-functional even when ICE should >>> be gracefully disabled. devm_of_qcom_ice_get() cannot know if the ICE >>> driver probe has failed due to above reasons or it is waiting for the SCM >>> driver. >> >> [...] >> >>> -static void qcom_ice_put(const struct qcom_ice *ice) >>> +static void qcom_ice_put(struct kref *kref) >>> { >>> - struct platform_device *pdev = to_platform_device(ice->dev); >>> - >>> - if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice")) >>> - platform_device_put(pdev); >>> + platform_device_put(to_platform_device(ice_handle->dev)); >>> + ice_handle = NULL; >>> } >>> >>> static void devm_of_qcom_ice_put(struct device *dev, void *res) >>> { >>> - qcom_ice_put(*(struct qcom_ice **)res); >>> + const struct qcom_ice *ice = *(struct qcom_ice **)res; >>> + struct platform_device *pdev = to_platform_device(ice->dev); >>> + >>> + if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice")) >>> + kref_put(&ice_handle->refcount, qcom_ice_put); >> >> IIUC this makes the refcount go down only in the legacy DT case - why? >> > > It is the other way around, no? Absence of 'ice' reg range in the consumer node > means it is using *new* binding. Yeah obviously you're right I suppose in the legacy case we don't need any refcounting, since there's only a single reference, from the storage controller device.. This assumption would break if someone had a funny idea to specify the same "ice" range for sdcc and ufs though (via the legacy binding), but let's hope no one does that.. Konrad