From: Marek Vasut marex@denx.de
[ Upstream commit 9cc832d37799dbea950c4c8a34721b02b8b5a8ff ]
With driver_async_probe=* on kernel command line, the following trace is produced because on i.MX8M Plus hardware because the soc-imx8m.c driver calls of_clk_get_by_name() which returns -EPROBE_DEFER because the clock driver is not yet probed. This was not detected during regular testing without driver_async_probe.
Convert the SoC code to platform driver and instantiate a platform device in its current device_initcall() to probe the platform driver. Rework .soc_revision callback to always return valid error code and return SoC revision via parameter. This way, if anything in the .soc_revision callback return -EPROBE_DEFER, it gets propagated to .probe and the .probe will get retried later.
" ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1 at drivers/soc/imx/soc-imx8m.c:115 imx8mm_soc_revision+0xdc/0x180 CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.11.0-next-20240924-00002-g2062bb554dea #603 Hardware name: DH electronics i.MX8M Plus DHCOM Premium Developer Kit (3) (DT) pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : imx8mm_soc_revision+0xdc/0x180 lr : imx8mm_soc_revision+0xd0/0x180 sp : ffff8000821fbcc0 x29: ffff8000821fbce0 x28: 0000000000000000 x27: ffff800081810120 x26: ffff8000818a9970 x25: 0000000000000006 x24: 0000000000824311 x23: ffff8000817f42c8 x22: ffff0000df8be210 x21: fffffffffffffdfb x20: ffff800082780000 x19: 0000000000000001 x18: ffffffffffffffff x17: ffff800081fff418 x16: ffff8000823e1000 x15: ffff0000c03b65e8 x14: ffff0000c00051b0 x13: ffff800082790000 x12: 0000000000000801 x11: ffff80008278ffff x10: ffff80008209d3a6 x9 : ffff80008062e95c x8 : ffff8000821fb9a0 x7 : 0000000000000000 x6 : 00000000000080e3 x5 : ffff0000df8c03d8 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : fffffffffffffdfb x0 : fffffffffffffdfb Call trace: imx8mm_soc_revision+0xdc/0x180 imx8_soc_init+0xb0/0x1e0 do_one_initcall+0x94/0x1a8 kernel_init_freeable+0x240/0x2a8 kernel_init+0x28/0x140 ret_from_fork+0x10/0x20 ---[ end trace 0000000000000000 ]--- SoC: i.MX8MP revision 1.1 "
Signed-off-by: Marek Vasut marex@denx.de Signed-off-by: Shawn Guo shawnguo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/imx/soc-imx8m.c | 107 ++++++++++++++++++++++++++++-------- 1 file changed, 85 insertions(+), 22 deletions(-)
diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c index ec87d9d878f30..1ff8c7d847a9e 100644 --- a/drivers/soc/imx/soc-imx8m.c +++ b/drivers/soc/imx/soc-imx8m.c @@ -30,7 +30,7 @@
struct imx8_soc_data { char *name; - u32 (*soc_revision)(void); + int (*soc_revision)(u32 *socrev); };
static u64 soc_uid; @@ -51,24 +51,29 @@ static u32 imx8mq_soc_revision_from_atf(void) static inline u32 imx8mq_soc_revision_from_atf(void) { return 0; }; #endif
-static u32 __init imx8mq_soc_revision(void) +static int imx8mq_soc_revision(u32 *socrev) { struct device_node *np; void __iomem *ocotp_base; u32 magic; u32 rev; struct clk *clk; + int ret;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp"); if (!np) - return 0; + return -EINVAL;
ocotp_base = of_iomap(np, 0); - WARN_ON(!ocotp_base); + if (!ocotp_base) { + ret = -EINVAL; + goto err_iomap; + } + clk = of_clk_get_by_name(np, NULL); if (IS_ERR(clk)) { - WARN_ON(IS_ERR(clk)); - return 0; + ret = PTR_ERR(clk); + goto err_clk; }
clk_prepare_enable(clk); @@ -88,32 +93,45 @@ static u32 __init imx8mq_soc_revision(void) soc_uid <<= 32; soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
+ *socrev = rev; + clk_disable_unprepare(clk); clk_put(clk); iounmap(ocotp_base); of_node_put(np);
- return rev; + return 0; + +err_clk: + iounmap(ocotp_base); +err_iomap: + of_node_put(np); + return ret; }
-static void __init imx8mm_soc_uid(void) +static int imx8mm_soc_uid(void) { void __iomem *ocotp_base; struct device_node *np; struct clk *clk; + int ret = 0; u32 offset = of_machine_is_compatible("fsl,imx8mp") ? IMX8MP_OCOTP_UID_OFFSET : 0;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp"); if (!np) - return; + return -EINVAL;
ocotp_base = of_iomap(np, 0); - WARN_ON(!ocotp_base); + if (!ocotp_base) { + ret = -EINVAL; + goto err_iomap; + } + clk = of_clk_get_by_name(np, NULL); if (IS_ERR(clk)) { - WARN_ON(IS_ERR(clk)); - return; + ret = PTR_ERR(clk); + goto err_clk; }
clk_prepare_enable(clk); @@ -124,31 +142,41 @@ static void __init imx8mm_soc_uid(void)
clk_disable_unprepare(clk); clk_put(clk); + +err_clk: iounmap(ocotp_base); +err_iomap: of_node_put(np); + + return ret; }
-static u32 __init imx8mm_soc_revision(void) +static int imx8mm_soc_revision(u32 *socrev) { struct device_node *np; void __iomem *anatop_base; - u32 rev; + int ret;
np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop"); if (!np) - return 0; + return -EINVAL;
anatop_base = of_iomap(np, 0); - WARN_ON(!anatop_base); + if (!anatop_base) { + ret = -EINVAL; + goto err_iomap; + }
- rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM); + *socrev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM);
iounmap(anatop_base); of_node_put(np);
- imx8mm_soc_uid(); + return imx8mm_soc_uid();
- return rev; +err_iomap: + of_node_put(np); + return ret; }
static const struct imx8_soc_data imx8mq_soc_data = { @@ -184,7 +212,7 @@ static __maybe_unused const struct of_device_id imx8_soc_match[] = { kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \ "unknown"
-static int __init imx8_soc_init(void) +static int imx8m_soc_probe(struct platform_device *pdev) { struct soc_device_attribute *soc_dev_attr; struct soc_device *soc_dev; @@ -212,8 +240,11 @@ static int __init imx8_soc_init(void) data = id->data; if (data) { soc_dev_attr->soc_id = data->name; - if (data->soc_revision) - soc_rev = data->soc_revision(); + if (data->soc_revision) { + ret = data->soc_revision(&soc_rev); + if (ret) + goto free_soc; + } }
soc_dev_attr->revision = imx8_revision(soc_rev); @@ -251,5 +282,37 @@ static int __init imx8_soc_init(void) kfree(soc_dev_attr); return ret; } + +static struct platform_driver imx8m_soc_driver = { + .probe = imx8m_soc_probe, + .driver = { + .name = "imx8m-soc", + }, +}; + +static int __init imx8_soc_init(void) +{ + struct platform_device *pdev; + int ret; + + /* No match means this is non-i.MX8M hardware, do nothing. */ + if (!of_match_node(imx8_soc_match, of_root)) + return 0; + + ret = platform_driver_register(&imx8m_soc_driver); + if (ret) { + pr_err("Failed to register imx8m-soc platform driver: %d\n", ret); + return ret; + } + + pdev = platform_device_register_simple("imx8m-soc", -1, NULL, 0); + if (IS_ERR(pdev)) { + pr_err("Failed to register imx8m-soc platform device: %ld\n", PTR_ERR(pdev)); + platform_driver_unregister(&imx8m_soc_driver); + return PTR_ERR(pdev); + } + + return 0; +} device_initcall(imx8_soc_init); MODULE_LICENSE("GPL");