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Commit 7ca38cf3 authored by Yaniv Gardi's avatar Yaniv Gardi Committed by James Bottomley
Browse files

scsi: ufs: provide a quirk to disable the LCC 



LCC (Line Control Command) are being used for communication between
UFS host and UFS device.
New commercial UFS devices don't have the issues with LCC processing
but UFS host controller might still have the issue with LCC processing,
hence, added a routine to disable TX LCC on the device.

Signed-off-by: default avatarYaniv Gardi <ygardi@codeaurora.org>
Reviewed-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Odin.com>
parent 81c7e06a

drivers/scsi/ufs/ufshcd.c

+42 −0
Original line number Diff line number Diff line
@@ -2640,6 +2640,42 @@ static int ufshcd_hba_enable(struct ufs_hba *hba) 
	return 0;

}



static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)

{

	int tx_lanes, i, err = 0;



	if (!peer)

		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),

			       &tx_lanes);

	else

		ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),

				    &tx_lanes);

	for (i = 0; i < tx_lanes; i++) {

		if (!peer)

			err = ufshcd_dme_set(hba,

				UIC_ARG_MIB_SEL(TX_LCC_ENABLE,

					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),

					0);

		else

			err = ufshcd_dme_peer_set(hba,

				UIC_ARG_MIB_SEL(TX_LCC_ENABLE,

					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),

					0);

		if (err) {

			dev_err(hba->dev, "%s: TX LCC Disable failed, peer = %d, lane = %d, err = %d",

				__func__, peer, i, err);

			break;

		}

	}



	return err;

}



static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba)

{

	return ufshcd_disable_tx_lcc(hba, true);

}



/**

 * ufshcd_link_startup - Initialize unipro link startup

 * @hba: per adapter instance
@@ -2677,6 +2713,12 @@ static int ufshcd_link_startup(struct ufs_hba *hba) 
		/* failed to get the link up... retire */

		goto out;



	if (hba->quirks & UFSHCD_QUIRK_BROKEN_LCC) {

		ret = ufshcd_disable_device_tx_lcc(hba);

		if (ret)

			goto out;

	}



	/* Include any host controller configuration via UIC commands */

	if (hba->vops && hba->vops->link_startup_notify) {

		ret = hba->vops->link_startup_notify(hba, POST_CHANGE);

drivers/scsi/ufs/ufshcd.h

+8 −0
Original line number Diff line number Diff line
@@ -426,6 +426,14 @@ struct ufs_hba { 
	 */

	#define UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS		UFS_BIT(1)



	/*

	 * If UFS host controller is having issue in processing LCC (Line

	 * Control Command) coming from device then enable this quirk.

	 * When this quirk is enabled, host controller driver should disable

	 * the LCC transmission on UFS device (by clearing TX_LCC_ENABLE

	 * attribute of device to 0).

	 */

	#define UFSHCD_QUIRK_BROKEN_LCC				UFS_BIT(2)



	unsigned int quirks;	/* Deviations from standard UFSHCI spec. */

drivers/scsi/ufs/ufshci.h

+3 −0
Original line number Diff line number Diff line
@@ -206,6 +206,9 @@ enum { 
#define CONFIG_RESULT_CODE_MASK		0xFF

#define GENERIC_ERROR_CODE_MASK		0xFF



/* GenSelectorIndex calculation macros for M-PHY attributes */

#define UIC_ARG_MPHY_TX_GEN_SEL_INDEX(lane) (lane)



#define UIC_ARG_MIB_SEL(attr, sel)	((((attr) & 0xFFFF) << 16) |\

					 ((sel) & 0xFFFF))

#define UIC_ARG_MIB(attr)		UIC_ARG_MIB_SEL(attr, 0)