diff options
| author | Dong Aisheng <aisheng.dong@nxp.com> | 2024-03-04 18:29:29 +0800 |
|---|---|---|
| committer | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2024-03-04 11:45:22 +0100 |
| commit | dd6c6d57ab61d496f6ff7d6ca38611062af142a1 (patch) | |
| tree | 68c433fcb48aac09fd95a7835284365b582e4021 /drivers/pwm | |
| parent | f2cea1dc2a9818e65bccfe27c4befaaa5274a700 (diff) | |
| download | linux-dd6c6d57ab61d496f6ff7d6ca38611062af142a1.tar.gz | |
pwm: imx-tpm: fix probe crash due to access registers without clock
The following commit abf6569d6482 ("pwm: imx-tpm: Make use of
devm_pwmchip_alloc() function") introduced an issue that accessing
registers without clock which results in the following boot crash
on MX7ULP platform. Fixed it by enabling clock properly.
Unhandled fault: external abort on non-linefetch (0x1008) at 0xf0978004
[f0978004] *pgd=64009811, *pte=40250653, *ppte=40250453
Internal error: : 1008 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc6-next-20240301 #18
Hardware name: Freescale i.MX7ULP (Device Tree)
PC is at pwm_imx_tpm_probe+0x1c/0xd8
LR is at __devm_ioremap_resource+0xf8/0x1dc
pc : [<c0629e58>] lr : [<c0562d4c>] psr: 80000053
sp : f0825e10 ip : 00000000 fp : 00000000
r10: c148f8c0 r9 : c41fc338 r8 : c164b000
r7 : 00000000 r6 : c406b400 r5 : c406b410 r4 : f0978000
r3 : 00000005 r2 : 00000000 r1 : a0000053 r0 : f0978000
Flags: Nzcv IRQs on FIQs off Mode SVC_32 ISA ARM Segment none
Control: 10c5387d Table: 6000406a DAC: 00000051
...
Call trace:
pwm_imx_tpm_probe from platform_probe+0x58/0xb0
platform_probe from really_probe+0xc4/0x2e0
really_probe from __driver_probe_device+0x84/0x19c
__driver_probe_device from driver_probe_device+0x2c/0x104
driver_probe_device from __driver_attach+0x90/0x170
__driver_attach from bus_for_each_dev+0x7c/0xd0
bus_for_each_dev from bus_add_driver+0xc4/0x1cc
bus_add_driver from driver_register+0x7c/0x114
driver_register from do_one_initcall+0x58/0x270
do_one_initcall from kernel_init_freeable+0x170/0x218
kernel_init_freeable from kernel_init+0x14/0x140
kernel_init from ret_from_fork+0x14/0x20
Fixes: abf6569d6482 ("pwm: imx-tpm: Make use of devm_pwmchip_alloc() function")
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Link: https://lore.kernel.org/r/20240304102929.893542-1-aisheng.dong@nxp.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-imx-tpm.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c index b04b974c5f32a..c50ddbac43c8c 100644 --- a/drivers/pwm/pwm-imx-tpm.c +++ b/drivers/pwm/pwm-imx-tpm.c @@ -337,6 +337,7 @@ static int pwm_imx_tpm_probe(struct platform_device *pdev) { struct pwm_chip *chip; struct imx_tpm_pwm_chip *tpm; + struct clk *clk; void __iomem *base; int ret; unsigned int npwm; @@ -346,6 +347,11 @@ static int pwm_imx_tpm_probe(struct platform_device *pdev) if (IS_ERR(base)) return PTR_ERR(base); + clk = devm_clk_get_enabled(&pdev->dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk), + "failed to get PWM clock\n"); + /* get number of channels */ val = readl(base + PWM_IMX_TPM_PARAM); npwm = FIELD_GET(PWM_IMX_TPM_PARAM_CHAN, val); @@ -358,11 +364,7 @@ static int pwm_imx_tpm_probe(struct platform_device *pdev) platform_set_drvdata(pdev, tpm); tpm->base = base; - - tpm->clk = devm_clk_get_enabled(&pdev->dev, NULL); - if (IS_ERR(tpm->clk)) - return dev_err_probe(&pdev->dev, PTR_ERR(tpm->clk), - "failed to get PWM clock\n"); + tpm->clk = clk; chip->ops = &imx_tpm_pwm_ops; |