Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux

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

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>

authored by

Thomas Richard (TI.com) and committed by
Martin K. Petersen
02880c08 57565f97

+29 -8
+29 -8
drivers/ufs/host/ti-j721e-ufs.c
··· 15 15 #define TI_UFS_SS_RST_N_PCS BIT(0) 16 16 #define TI_UFS_SS_CLK_26MHZ BIT(4) 17 17 18 + struct ti_j721e_ufs { 19 + void __iomem *regbase; 20 + u32 reg; 21 + }; 22 + 18 23 static int ti_j721e_ufs_probe(struct platform_device *pdev) 19 24 { 20 25 struct device *dev = &pdev->dev; 26 + struct ti_j721e_ufs *ufs; 21 27 unsigned long clk_rate; 22 - void __iomem *regbase; 23 28 struct clk *clk; 24 - u32 reg = 0; 25 29 int ret; 26 30 27 - regbase = devm_platform_ioremap_resource(pdev, 0); 28 - if (IS_ERR(regbase)) 29 - return PTR_ERR(regbase); 31 + ufs = devm_kzalloc(dev, sizeof(*ufs), GFP_KERNEL); 32 + if (!ufs) 33 + return -ENOMEM; 34 + 35 + ufs->regbase = devm_platform_ioremap_resource(pdev, 0); 36 + if (IS_ERR(ufs->regbase)) 37 + return PTR_ERR(ufs->regbase); 30 38 31 39 pm_runtime_enable(dev); 32 40 ret = pm_runtime_resume_and_get(dev); ··· 50 42 } 51 43 clk_rate = clk_get_rate(clk); 52 44 if (clk_rate == 26000000) 53 - reg |= TI_UFS_SS_CLK_26MHZ; 45 + ufs->reg |= TI_UFS_SS_CLK_26MHZ; 54 46 devm_clk_put(dev, clk); 55 47 56 48 /* Take UFS slave device out of reset */ 57 - reg |= TI_UFS_SS_RST_N_PCS; 58 - writel(reg, regbase + TI_UFS_SS_CTRL); 49 + ufs->reg |= TI_UFS_SS_RST_N_PCS; 50 + writel(ufs->reg, ufs->regbase + TI_UFS_SS_CTRL); 51 + 52 + dev_set_drvdata(dev, ufs); 59 53 60 54 ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, 61 55 dev); ··· 82 72 pm_runtime_disable(&pdev->dev); 83 73 } 84 74 75 + static int ti_j721e_ufs_resume(struct device *dev) 76 + { 77 + struct ti_j721e_ufs *ufs = dev_get_drvdata(dev); 78 + 79 + writel(ufs->reg, ufs->regbase + TI_UFS_SS_CTRL); 80 + return 0; 81 + } 82 + 83 + static DEFINE_SIMPLE_DEV_PM_OPS(ti_j721e_ufs_pm_ops, NULL, ti_j721e_ufs_resume); 84 + 85 85 static const struct of_device_id ti_j721e_ufs_of_match[] = { 86 86 { 87 87 .compatible = "ti,j721e-ufs", ··· 107 87 .driver = { 108 88 .name = "ti-j721e-ufs", 109 89 .of_match_table = ti_j721e_ufs_of_match, 90 + .pm = pm_sleep_ptr(&ti_j721e_ufs_pm_ops), 110 91 }, 111 92 }; 112 93 module_platform_driver(ti_j721e_ufs_driver);