Commit c4960164 authored by Nitin Rawat's avatar Nitin Rawat Committed by Martin K. Petersen
Browse files

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: default avatarNitin Rawat <quic_nitirawa@quicinc.com>
Link: https://lore.kernel.org/r/20250714075336.2133-3-quic_nitirawa@quicinc.com


Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 7a9d5195

drivers/ufs/core/ufshcd.c

+24 −0
Original line number Diff line number Diff line
@@ -4253,6 +4253,30 @@ int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel, 
}

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.

include/ufs/ufshcd.h

+1 −0
Original line number Diff line number Diff line
@@ -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)