FROMLIST: scsi: ufs: ufs-qcom: Add specified gear support for multi gear scaling - #98
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Tingwei Zhang (quic-tingweiz) merged 2 commits intoSep 2, 2026
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…ear scaling The UFS clock frequency and gear speed do not necessarily have a strict one-to-one correspondence on all platforms. Introduce a device tree based configuration interface that allows specifying the HS gear speed for each supported operating frequency via the "opp-level" property in the OPP table. When this property is not configured, the driver falls back to the default frequency-to-gear mapping table. Signed-off-by: Ziqi Chen <ziqi.chen@oss.qualcomm.com> Signed-off-by: Nitin Rawat <nitin.rawat@oss.qualcomm.com> Signed-off-by: Giri Prasad Goriparthi <giri.goriparthi@oss.qualcomm.com>
Assign the appropriate UFS HS gear speed levels to each OPP frequency entry in the device tree, enabling proper per-frequency gear scaling (G1 at 75MHz, G3 at 150MHz, G5 at 300MHz). Signed-off-by: Nitin Rawat <nitin.rawat@oss.qualcomm.com> Signed-off-by: Giri Prasad Goriparthi <giri.goriparthi@oss.qualcomm.com>
Tingwei Zhang (quic-tingweiz)
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Aug 31, 2026
Tingwei Zhang (quic-tingweiz)
merged commit Sep 2, 2026
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This patch series adds support for configuring UFS gear speeds on a per-OPP frequency basis for Qualcomm UFS host controllers, enabling more flexible multi-gear scaling.
On certain Qualcomm platforms, the UFS clock frequency and gear speed do not have a strict one-to-one mapping. To handle this, the first patch introduces a device tree based configuration mechanism using the "opp-level" property within the OPP table. This allows each supported operating frequency to be explicitly associated with a specific HS gear speed. When this property is absent, the driver gracefully falls back to the existing default frequency-to-gear lookup table.
The second patch applies this configuration to the Hamoa platform, assigning the appropriate HS gear levels (G1, G3, G5) to the corresponding OPP frequency entries in the device tree.
[PATCH v1 1/2] scsi: ufs: ufs-qcom: Add specified gear support for multi gear scaling
The UFS clock frequency and gear speed do not necessarily have a strict one-to-one correspondence on all platforms. Introduce a device tree based configuration interface that allows specifying the HS gear speed for each supported operating frequency via the "opp-level" property in the OPP table. When this property is not configured, the driver falls back to the default frequency-to-gear mapping table.
[PATCH v1 2/2] arm64: dts: qcom: Set specified gear configuration for Hamoa
Assign the appropriate UFS HS gear speed levels to each OPP frequency entry in the device tree, enabling proper per-frequency gear scaling (G1 at 75MHz, G3 at 150MHz, G5 at 300MHz).
Link: https://lore.kernel.org/linux-scsi/20260829074355.946543-1-nitin.rawat@oss.qualcomm.com/