Commit 02880c08 authored by Thomas Richard (TI.com)'s avatar Thomas Richard (TI.com) Committed by Martin K. Petersen
Browse files

scsi: ufs: ti-j721e: Add suspend-resume support 



Restore the ctrl register to resume the TI UFS wrapper.

Signed-off-by: default avatarThomas Richard (TI.com) <thomas.richard@bootlin.com>
Link: https://patch.msgid.link/20251106-scsi-ufs-ti-j721e-suspend-resume-support-v1-1-6f395f51219e@bootlin.com


Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 57565f97

drivers/ufs/host/ti-j721e-ufs.c

+29 −8
Original line number Diff line number Diff line
@@ -15,18 +15,26 @@ 
#define TI_UFS_SS_RST_N_PCS	BIT(0)

#define TI_UFS_SS_CLK_26MHZ	BIT(4)



struct ti_j721e_ufs {

	void __iomem *regbase;

	u32 reg;

};



static int ti_j721e_ufs_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct ti_j721e_ufs *ufs;

	unsigned long clk_rate;

	void __iomem *regbase;

	struct clk *clk;

	u32 reg = 0;

	int ret;



	regbase = devm_platform_ioremap_resource(pdev, 0);

	if (IS_ERR(regbase))

		return PTR_ERR(regbase);

	ufs = devm_kzalloc(dev, sizeof(*ufs), GFP_KERNEL);

	if (!ufs)

		return -ENOMEM;



	ufs->regbase = devm_platform_ioremap_resource(pdev, 0);

	if (IS_ERR(ufs->regbase))

		return PTR_ERR(ufs->regbase);



	pm_runtime_enable(dev);

	ret = pm_runtime_resume_and_get(dev);
@@ -42,12 +50,14 @@ static int ti_j721e_ufs_probe(struct platform_device *pdev) 
	}

	clk_rate = clk_get_rate(clk);

	if (clk_rate == 26000000)

		reg |= TI_UFS_SS_CLK_26MHZ;

		ufs->reg |= TI_UFS_SS_CLK_26MHZ;

	devm_clk_put(dev, clk);



	/*  Take UFS slave device out of reset */

	reg |= TI_UFS_SS_RST_N_PCS;

	writel(reg, regbase + TI_UFS_SS_CTRL);

	ufs->reg |= TI_UFS_SS_RST_N_PCS;

	writel(ufs->reg, ufs->regbase + TI_UFS_SS_CTRL);



	dev_set_drvdata(dev, ufs);



	ret = of_platform_populate(pdev->dev.of_node, NULL, NULL,

				   dev);
@@ -72,6 +82,16 @@ static void ti_j721e_ufs_remove(struct platform_device *pdev) 
	pm_runtime_disable(&pdev->dev);

}



static int ti_j721e_ufs_resume(struct device *dev)

{

	struct ti_j721e_ufs *ufs = dev_get_drvdata(dev);



	writel(ufs->reg, ufs->regbase + TI_UFS_SS_CTRL);

	return 0;

}



static DEFINE_SIMPLE_DEV_PM_OPS(ti_j721e_ufs_pm_ops, NULL, ti_j721e_ufs_resume);



static const struct of_device_id ti_j721e_ufs_of_match[] = {

	{

		.compatible = "ti,j721e-ufs",
@@ -87,6 +107,7 @@ static struct platform_driver ti_j721e_ufs_driver = { 
	.driver	= {

		.name   = "ti-j721e-ufs",

		.of_match_table = ti_j721e_ufs_of_match,

		.pm = pm_sleep_ptr(&ti_j721e_ufs_pm_ops),

	},

};

module_platform_driver(ti_j721e_ufs_driver);