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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b76f5a7afb4sm163922466b.70.2025.11.27.05.40.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Nov 2025 05:40:30 -0800 (PST) Message-ID: Date: Thu, 27 Nov 2025 14:40:28 +0100 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 2/3] arm64: dts: qcom: sm8550: Enable UHS-I SDR50 and SDR104 SD card modes To: Vladimir Zapolskiy , Bjorn Andersson , Konrad Dybcio , Krzysztof Kozlowski Cc: Neil Armstrong , Rob Herring , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org References: <20251126012043.3764567-1-vladimir.zapolskiy@linaro.org> <20251126012043.3764567-3-vladimir.zapolskiy@linaro.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20251126012043.3764567-3-vladimir.zapolskiy@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: aX9NVDaolUtU6_JMLGMpDwkb5q3UA021 X-Proofpoint-ORIG-GUID: aX9NVDaolUtU6_JMLGMpDwkb5q3UA021 X-Authority-Analysis: v=2.4 cv=OPcqHCaB c=1 sm=1 tr=0 ts=692854d0 cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=KKAkSRfTAAAA:8 a=DfSktKokjTjfYq3N_6AA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI3MDEwMSBTYWx0ZWRfX77g9jxbYDGA9 x2O8+IgO/1nyJIlHtqP03Ng3s3J2RZWaWajFYjkBRH2+khwg1p2QJ9cIqSBVcIUgMLpyE4DntVv TRbdIjPDirt3bpZeMt+o9oASFY8devIc//457aql3MJZ1SphMUTaoR5n5VUXsahf3z5MUcbjWlU sba7q/nY+HZWS8wmdoH/bFhqOHQmMmCVJQWy+2ahesSN8jeRIs+64Mxsrgz5J5Qx4eQ+fVMgIZb D7BxNzYeqcYGCI8uGYoSOCiki/oMP4IJM8DJJGVWugcUDFa1KHNk5sfm/Y3kNSYwxlbhc571sO4 4LkvXrvmGhdRa93Osh440E29mNulq0CbnpJhfiuebguL7OUUTe2w7wh8SkXmKnhABM9tryE4o/L zucXxST7/7BozQXiPLYJWko3bXa8aQ== 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=2025-11-25_02,2025-11-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 spamscore=0 malwarescore=0 phishscore=0 suspectscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511270101 On 11/26/25 2:20 AM, Vladimir Zapolskiy wrote: > The restriction on UHS-I speed modes was added to all SM8550 platforms > by copying it from SM8450 dtsi file, and due to the overclocking of SD > cards it was an actually reproducible problem. Since the latter issue > has been fixed, UHS-I speed modes are working fine on SM8550 boards, > below is the test performed on SM8550-HDK: > > SDR50 speed mode: > > mmc0: new UHS-I speed SDR50 SDHC card at address 0001 > mmcblk0: mmc0:0001 00000 14.6 GiB > mmcblk0: p1 > > % dd if=/dev/mmcblk0p1 of=/dev/null bs=1M count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 23.5468 s, 45.6 MB/s > > SDR104 speed mode: > > mmc0: new UHS-I speed SDR104 SDHC card at address 59b4 > mmcblk0: mmc0:59b4 USDU1 28.3 GiB > mmcblk0: p1 > > % dd if=/dev/mmcblk0p1 of=/dev/null bs=1M count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 11.9819 s, 89.6 MB/s > > Unset the UHS-I speed mode restrictions from the SM8550 platform dtsi > file, there is no indication that the SDHC controller is broken. > > Signed-off-by: Vladimir Zapolskiy > --- 8550 has additional limitations. One was addressed recently with max-sd-hs-hz (HS mode can only run at 37.5 MHz), but when in SDR104, the frequency must also be capped to 148 MHz. I don't know whether the driver respects that today. Konrad