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scsi: ufs: core: Add ufshcd_dme_rmw() to modify DME attributes 

Introduce ufshcd_dme_rmw() API to read, modify, and write DME attributes
in UFS host controllers using a mask and value.

Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Link: https://lore.kernel.org/r/20250714075336.2133-3-quic_nitirawa@quicinc.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Nitin Rawat 2025-07-14 13:23:35 +05:30 committed by Martin K. Petersen
parent 7a9d5195a7
commit c49601642f
2 changed files with 25 additions and 0 deletions
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24
drivers/ufs/core/ufshcd.c
View File

@ -4253,6 +4253,30 @@ out:
}
EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);
/**
* ufshcd_dme_rmw - get modify set a DME attribute
* @hba: per adapter instance
* @mask: indicates which bits to clear from the value that has been read
* @val: actual value to write
* @attr: dme attribute
*/
int ufshcd_dme_rmw(struct ufs_hba *hba, u32 mask,
u32 val, u32 attr)
{
u32 cfg = 0;
int err;
err = ufshcd_dme_get(hba, UIC_ARG_MIB(attr), &cfg);
if (err)
return err;
cfg &= ~mask;
cfg |= (val & mask);
return ufshcd_dme_set(hba, UIC_ARG_MIB(attr), cfg);
}
EXPORT_SYMBOL_GPL(ufshcd_dme_rmw);
/**
* ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
* state) and waits for it to take effect.

1
include/ufs/ufshcd.h
View File

@ -1480,6 +1480,7 @@ void ufshcd_resume_complete(struct device *dev);
bool ufshcd_is_hba_active(struct ufs_hba *hba);
void ufshcd_pm_qos_init(struct ufs_hba *hba);
void ufshcd_pm_qos_exit(struct ufs_hba *hba);
int ufshcd_dme_rmw(struct ufs_hba *hba, u32 mask, u32 val, u32 attr);
/* Wrapper functions for safely calling variant operations */
static inline int ufshcd_vops_init(struct ufs_hba *hba)