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Commit 0a4e7663 authored by Asutosh Das's avatar Asutosh Das Committed by Anjana
Browse files

scsi: ufs: Add freeze and restore callbacks 



Adds freeze, thaw and restore callbacks for hibernate and restore
functionality.

Change-Id: I5db830d4d7b29d54043eb80cbc5e8684b95a82e6
Signed-off-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
Signed-off-by: default avatarAnjana <ahari@codeaurora.org>
parent 2537e5e5

drivers/scsi/ufs/ufshcd-pltfrm.c

+39 −0
Original line number Diff line number Diff line
@@ -370,6 +370,45 @@ static void ufshcd_parse_dev_ref_clk_freq(struct ufs_hba *hba) 
}



#ifdef CONFIG_SMP

/**

 * ufshcd_pltfrm_restore - restore power management function

 * @dev: pointer to device handle

 *

 * Returns 0 if successful

 * Returns non-zero otherwise

 */

int ufshcd_pltfrm_restore(struct device *dev)

{

	return ufshcd_system_restore(dev_get_drvdata(dev));

}

EXPORT_SYMBOL(ufshcd_pltfrm_restore);



/**

 * ufshcd_pltfrm_freeze - freeze power management function

 * @dev: pointer to device handle

 *

 * Returns 0 if successful

 * Returns non-zero otherwise

 */

int ufshcd_pltfrm_freeze(struct device *dev)

{

	return ufshcd_system_freeze(dev_get_drvdata(dev));

}

EXPORT_SYMBOL(ufshcd_pltfrm_freeze);



/**

 * ufshcd_pltfrm_thaw - freeze power management function

 * @dev: pointer to device handle

 *

 * Returns 0 if successful

 * Returns non-zero otherwise

 */

int ufshcd_pltfrm_thaw(struct device *dev)

{

	return ufshcd_system_thaw(dev_get_drvdata(dev));

}

EXPORT_SYMBOL(ufshcd_pltfrm_thaw);



/**

 * ufshcd_pltfrm_suspend - suspend power management function

 * @dev: pointer to device handle

drivers/scsi/ufs/ufshcd-pltfrm.h

+4 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.

/* Copyright (c) 2015, 2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -27,6 +27,9 @@ int ufshcd_pltfrm_resume(struct device *dev); 
int ufshcd_pltfrm_runtime_suspend(struct device *dev);

int ufshcd_pltfrm_runtime_resume(struct device *dev);

int ufshcd_pltfrm_runtime_idle(struct device *dev);

int ufshcd_pltfrm_freeze(struct device *dev);

int ufshcd_pltfrm_restore(struct device *dev);

int ufshcd_pltfrm_thaw(struct device *dev);



#else /* !CONFIG_PM */

drivers/scsi/ufs/ufshcd.c

+41 −3
Original line number Diff line number Diff line
@@ -3817,8 +3817,8 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) 
	if (err) {

		if (err != -EAGAIN)

			dev_err(hba->dev,

				"%s: failed to compose upiu %d\n",

				__func__, err);

				"%s: failed to compose upiu %d cmd:0x%08x lun:%d\n",

				__func__, err, cmd, lrbp->lun);



		lrbp->cmd = NULL;

		clear_bit_unlock(tag, &hba->lrb_in_use);
@@ -10254,7 +10254,19 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) 
	ret = ufshcd_vreg_set_hpm(hba);

	if (ret)

		goto disable_irq_and_vops_clks;



	if (hba->restore) {

		/* Configure UTRL and UTMRL base address registers */

		ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),

			      REG_UTP_TRANSFER_REQ_LIST_BASE_L);

		ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),

			      REG_UTP_TRANSFER_REQ_LIST_BASE_H);

		ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),

			      REG_UTP_TASK_REQ_LIST_BASE_L);

		ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),

			      REG_UTP_TASK_REQ_LIST_BASE_H);

		/* Commit the registers */

		mb();

	}

	/*

	 * Call vendor specific resume callback. As these callbacks may access

	 * vendor specific host controller register space call them when the
@@ -10269,6 +10281,10 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) 
	     (ufshcd_is_card_online(hba) && !hba->sdev_ufs_device)))

		goto skip_dev_ops;



	/* Resuming from hibernate, assume that link was OFF */

	if (hba->restore)

		ufshcd_set_link_off(hba);



	if (ufshcd_is_link_hibern8(hba)) {

		ret = ufshcd_uic_hibern8_exit(hba);

		if (!ret) {
@@ -10340,6 +10356,9 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) 
out:

	hba->pm_op_in_progress = 0;



	if (hba->restore)

		hba->restore = false;



	if (ret)

		ufshcd_update_error_stats(hba, UFS_ERR_RESUME);
@@ -10502,6 +10521,25 @@ int ufshcd_runtime_idle(struct ufs_hba *hba) 
}

EXPORT_SYMBOL(ufshcd_runtime_idle);



int ufshcd_system_freeze(struct ufs_hba *hba)

{

	return ufshcd_system_suspend(hba);

}

EXPORT_SYMBOL(ufshcd_system_freeze);



int ufshcd_system_restore(struct ufs_hba *hba)

{

	hba->restore = true;

	return ufshcd_system_resume(hba);

}

EXPORT_SYMBOL(ufshcd_system_restore);



int ufshcd_system_thaw(struct ufs_hba *hba)

{

	return ufshcd_system_resume(hba);

}

EXPORT_SYMBOL(ufshcd_system_thaw);



static inline ssize_t ufshcd_pm_lvl_store(struct device *dev,

					   struct device_attribute *attr,

					   const char *buf, size_t count,

drivers/scsi/ufs/ufshcd.h

+8 −1
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ 
 *

 * This code is based on drivers/scsi/ufs/ufshcd.h

 * Copyright (C) 2011-2013 Samsung India Software Operations

 * Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.

 *

 * Authors:

 *	Santosh Yaraganavi <santosh.sy@samsung.com>
@@ -112,11 +112,13 @@ enum ufs_pm_op { 
	UFS_RUNTIME_PM,

	UFS_SYSTEM_PM,

	UFS_SHUTDOWN_PM,

	UFS_SYSTEM_RESTORE,

};



#define ufshcd_is_runtime_pm(op) ((op) == UFS_RUNTIME_PM)

#define ufshcd_is_system_pm(op) ((op) == UFS_SYSTEM_PM)

#define ufshcd_is_shutdown_pm(op) ((op) == UFS_SHUTDOWN_PM)

#define ufshcd_is_restore(op) ((op) == UFS_SYSTEM_RESTORE)



/* Host <-> Device UniPro Link state */

enum uic_link_state {
@@ -1042,6 +1044,8 @@ struct ufs_hba { 


	bool reinit_g4_rate_A;

	bool force_g4;

	/* distinguish between resume and restore */

	bool restore;

};



static inline void ufshcd_mark_shutdown_ongoing(struct ufs_hba *hba)
@@ -1171,6 +1175,9 @@ static inline bool ufshcd_keep_autobkops_enabled_except_suspend( 
	return hba->caps & UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND;

}



extern int ufshcd_system_thaw(struct ufs_hba *hba);

extern int ufshcd_system_restore(struct ufs_hba *hba);

extern int ufshcd_system_freeze(struct ufs_hba *hba);

extern int ufshcd_runtime_suspend(struct ufs_hba *hba);

extern int ufshcd_runtime_resume(struct ufs_hba *hba);

extern int ufshcd_runtime_idle(struct ufs_hba *hba);