| Message ID | 20241107080505.29244-2-quic_sartgarg@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add level shifter support for qualcomm SOC's | expand |
On Thu, 07 Nov 2024 13:35:03 +0530, Sarthak Garg wrote: > Introduce a flag to indicate if the Qualcomm platform has a level > shifter for SD cards. With level shifter addition some extra delay is > seen on RX data path leading to CRC errors. To compensate these delays > and avoid CRC errors below things needs to be done: > > 1) Enable tuning for SDR50 mode > 2) Limit HS mode frequency to 37.5MHz from 50MHz > > Add this flag for all targets with a level shifter to handle these > issues for SD card. > > Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com> > --- > Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++ > 1 file changed, 3 insertions(+) > My bot found errors running 'make dt_binding_check' on your patch: yamllint warnings/errors: dtschema/dtc warnings/errors: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml: qcom,use-level-shifter: missing type definition doc reference errors (make refcheckdocs): See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20241107080505.29244-2-quic_sartgarg@quicinc.com The base for the series is generally the latest rc1. A different dependency should be noted in *this* patch. If you already ran 'make dt_binding_check' and didn't see the above error(s), then make sure 'yamllint' is installed and dt-schema is up to date: pip3 install dtschema --upgrade Please check and re-submit after running the above command yourself. Note that DT_SCHEMA_FILES can be set to your schema file to speed up checking your schema. However, it must be unset to test all examples with your schema.
On Thu, Nov 07, 2024 at 01:35:03PM +0530, Sarthak Garg wrote: > Introduce a flag to indicate if the Qualcomm platform has a level > shifter for SD cards. With level shifter addition some extra delay is > seen on RX data path leading to CRC errors. To compensate these delays > and avoid CRC errors below things needs to be done: > > 1) Enable tuning for SDR50 mode > 2) Limit HS mode frequency to 37.5MHz from 50MHz > > Add this flag for all targets with a level shifter to handle these > issues for SD card. > > Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com> > --- > Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++ > 1 file changed, 3 insertions(+) > This wasn't tested, so just short review - platform means SoC usually, so this looks SoC specific, thus implied by compatible. Best regards, Krzysztof
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml index b32253c60919..14f1ec9ae5bd 100644 --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml @@ -131,6 +131,9 @@ properties: $ref: /schemas/types.yaml#/definitions/uint32 description: platform specific settings for DLL_CONFIG reg. + qcom,use-level-shifter: + description: Flag to indicate if platform has level shifter for SD card. + iommus: minItems: 1 maxItems: 8
Introduce a flag to indicate if the Qualcomm platform has a level shifter for SD cards. With level shifter addition some extra delay is seen on RX data path leading to CRC errors. To compensate these delays and avoid CRC errors below things needs to be done: 1) Enable tuning for SDR50 mode 2) Limit HS mode frequency to 37.5MHz from 50MHz Add this flag for all targets with a level shifter to handle these issues for SD card. Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com> --- Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++ 1 file changed, 3 insertions(+)