scsi: ufs: ufs-qcom: Add support for finding max gear on new platforms
Starting from Qcom UFS version 4.0, vendor specific REG_UFS_PARAM0 register can be used to determine the maximum gear supported by the controller. Suggested-by: Can Guo <quic_cang@quicinc.com> Reviewed-by: Andrew Halaney <ahalaney@redhat.com> Tested-by: Andrew Halaney <ahalaney@redhat.com> # Qdrive3/sa8540p-ride Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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drivers/ufs/host
@ -282,6 +282,8 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
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* Hence downgrade the maximum supported gear to HS-G2.
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*/
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return UFS_HS_G2;
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} else if (host->hw_ver.major >= 0x4) {
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return UFS_QCOM_MAX_GEAR(ufshcd_readl(hba, REG_UFS_PARAM0));
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}
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/* Default is HS-G3 */
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@ -94,6 +94,10 @@ enum {
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#define TMRLUT_HW_CGC_EN BIT(6)
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#define OCSC_HW_CGC_EN BIT(7)
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/* bit definitions for REG_UFS_PARAM0 */
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#define MAX_HS_GEAR_MASK GENMASK(6, 4)
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#define UFS_QCOM_MAX_GEAR(x) FIELD_GET(MAX_HS_GEAR_MASK, (x))
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/* bit definition for UFS_UFS_TEST_BUS_CTRL_n */
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#define TEST_BUS_SUB_SEL_MASK GENMASK(4, 0) /* All XXX_SEL fields are 5 bits wide */
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