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

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Restore the ctrl register to resume the TI UFS wrapper.

Signed-off-by: Thomas 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: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Thomas Richard (TI.com)
2025-11-06 15:21:54 +01:00
committed by Martin K. Petersen
parent 57565f97b0
commit 02880c083c
1 changed files with 29 additions and 8 deletions
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37
drivers/ufs/host/ti-j721e-ufs.c
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@@ -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);