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93f823e7d4
The restriction on UHS-I speed modes was added to all SM8650 platforms
by copying it from SM8450 and SM8550 dtsi files, and it was an actually
reproducible problem due to the overclocking of SD cards. Since the latter
issue has been fixed in the SM8650 GCC driver, UHS-I speed modes are
working fine on SM8650 boards, below is the test performed on SM8650-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, 24.8086 s, 43.3 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, 12.9448 s, 82.9 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.
Fixes: 10e0246712 ("arm64: dts: qcom: sm8650: add interconnect dependent device nodes")
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Link: https://lore.kernel.org/r/20260314023715.357512-7-vladimir.zapolskiy@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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