Re: [PATCH] media: hantro: disable runtime PM before hardware teardown

[Benjamin Gaignard <benjamin.gaignard@collabora.com>]

Le 22/07/2026 à 18:08, Tharit Tangkijwanichakul a écrit :
> Removing the Hantro driver may trigger an SError on RK3588:
> 	SError Interrupt on CPU6, code 0x00000000be000011 -- SError
> 	...
> 	do_serror+0x5c/0x74
> 	el1h_64_error_handler+0x34/0x50
> 	el1h_64_error+0x6c/0x70
> 	regmap_mmio_read32le+0x10/0x20 (P)
> 	_regmap_bus_reg_read+0x6c/0xb4
> 	_regmap_read+0x60/0xdc
> 	regmap_read+0x4c/0x80
> 	rockchip_pd_power+0xe4/0x600
> 	rockchip_pd_power_off+0x1c/0x60
> 	_genpd_power_off+0x98/0x198
> 	genpd_power_off.part.0+0x178/0x288
> 	genpd_runtime_suspend+0x210/0x300
> 	__rpm_callback+0x48/0x1e0
> 	rpm_callback+0x74/0x80
> 	rpm_suspend+0x10c/0x580
> 	rpm_idle+0x134/0x1b8
> 	update_autosuspend+0x30/0xc4
> 	__pm_runtime_use_autosuspend+0x48/0x64
> 	hantro_remove+0x8c/0xa8 [hantro_vpu]
> 	...
>
> hantro_remove() currently asserts the device resets before disabling
> runtime PM.
>
> Calling pm_runtime_dont_use_autosuspend() causes an idle device to be
> runtime-suspended immediately. At that point the Hantro hardware has
> already been torn down, while the generic power-domain genpd code
> still performs the power-off sequence. genpd regmap_mmio_read causes panic
> subsequently because the reset lines were asserted.
>
> Disable runtime PM before asserting the reset lines so that no runtime-PM
> transition can race with hardware teardown.
>
> Apply the same ordering to the probe error paths as well.
>
> Fixes: ea71631b7129 ("media: hantro: add support for reset lines")
> Signed-off-by: Tharit Tangkijwanichakul <tharitt97@gmail.com>

Reviewed-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

> ---
>   drivers/media/platform/verisilicon/hantro_drv.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
> index 2e81877f640f..bbeec5ae509a 100644
> --- a/drivers/media/platform/verisilicon/hantro_drv.c
> +++ b/drivers/media/platform/verisilicon/hantro_drv.c
> @@ -1212,7 +1212,7 @@ static int hantro_probe(struct platform_device *pdev)
>   	ret = clk_bulk_prepare(vpu->variant->num_clocks, vpu->clocks);
>   	if (ret) {
>   		dev_err(&pdev->dev, "Failed to prepare clocks\n");
> -		goto err_rst_assert;
> +		goto err_pm_disable_assert_reset;
>   	}
>   
>   	ret = v4l2_device_register(&pdev->dev, &vpu->v4l2_dev);
> @@ -1266,8 +1266,11 @@ static int hantro_probe(struct platform_device *pdev)
>   	v4l2_device_unregister(&vpu->v4l2_dev);
>   err_clk_unprepare:
>   	clk_bulk_unprepare(vpu->variant->num_clocks, vpu->clocks);
> -err_rst_assert:
> +err_pm_disable_assert_reset:
> +	pm_runtime_dont_use_autosuspend(vpu->dev);
> +	pm_runtime_disable(vpu->dev);
>   	reset_control_assert(vpu->resets);
> +	return ret;
>   err_pm_disable:
>   	pm_runtime_dont_use_autosuspend(vpu->dev);
>   	pm_runtime_disable(vpu->dev);
> @@ -1287,9 +1290,9 @@ static void hantro_remove(struct platform_device *pdev)
>   	v4l2_m2m_put(vpu->m2m_dev);
>   	v4l2_device_unregister(&vpu->v4l2_dev);
>   	clk_bulk_unprepare(vpu->variant->num_clocks, vpu->clocks);
> -	reset_control_assert(vpu->resets);
>   	pm_runtime_dont_use_autosuspend(vpu->dev);
>   	pm_runtime_disable(vpu->dev);
> +	reset_control_assert(vpu->resets);
>   }
>   
>   #ifdef CONFIG_PM
>
> base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482