Re: [PATCH v2 2/9] media: hantro: add support for reset lines

[Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>]

Hi Jernej,

W dniu 29.11.2021 o 19:26, Jernej Skrabec pisze:
> Some SoCs like Allwinner H6 use reset lines for resetting Hantro G2. Add
> support for them.
>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>

> ---
>   drivers/staging/media/hantro/hantro.h     |  3 +++
>   drivers/staging/media/hantro/hantro_drv.c | 15 ++++++++++++++-
>   2 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/media/hantro/hantro.h b/drivers/staging/media/hantro/hantro.h
> index 7da23f7f207a..33eb3e092cc1 100644
> --- a/drivers/staging/media/hantro/hantro.h
> +++ b/drivers/staging/media/hantro/hantro.h
> @@ -16,6 +16,7 @@
>   #include <linux/videodev2.h>
>   #include <linux/wait.h>
>   #include <linux/clk.h>
> +#include <linux/reset.h>
>   
>   #include <media/v4l2-ctrls.h>
>   #include <media/v4l2-device.h>
> @@ -171,6 +172,7 @@ hantro_vdev_to_func(struct video_device *vdev)
>    * @dev:		Pointer to device for convenient logging using
>    *			dev_ macros.
>    * @clocks:		Array of clock handles.
> + * @resets:		Array of reset handles.
>    * @reg_bases:		Mapped addresses of VPU registers.
>    * @enc_base:		Mapped address of VPU encoder register for convenience.
>    * @dec_base:		Mapped address of VPU decoder register for convenience.
> @@ -190,6 +192,7 @@ struct hantro_dev {
>   	struct platform_device *pdev;
>   	struct device *dev;
>   	struct clk_bulk_data *clocks;
> +	struct reset_control *resets;
>   	void __iomem **reg_bases;
>   	void __iomem *enc_base;
>   	void __iomem *dec_base;
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index 3d3107a39dae..770f4ce71d29 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -905,6 +905,10 @@ static int hantro_probe(struct platform_device *pdev)
>   			return PTR_ERR(vpu->clocks[0].clk);
>   	}
>   
> +	vpu->resets = devm_reset_control_array_get(&pdev->dev, false, true);
> +	if (IS_ERR(vpu->resets))
> +		return PTR_ERR(vpu->resets);
> +
>   	num_bases = vpu->variant->num_regs ?: 1;
>   	vpu->reg_bases = devm_kcalloc(&pdev->dev, num_bases,
>   				      sizeof(*vpu->reg_bases), GFP_KERNEL);
> @@ -978,10 +982,16 @@ static int hantro_probe(struct platform_device *pdev)
>   	pm_runtime_use_autosuspend(vpu->dev);
>   	pm_runtime_enable(vpu->dev);
>   
> +	ret = reset_control_deassert(vpu->resets);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to deassert resets\n");
> +		goto err_pm_disable;
> +	}
> +
>   	ret = clk_bulk_prepare(vpu->variant->num_clocks, vpu->clocks);
>   	if (ret) {
>   		dev_err(&pdev->dev, "Failed to prepare clocks\n");
> -		goto err_pm_disable;
> +		goto err_rst_assert;
>   	}
>   
>   	ret = v4l2_device_register(&pdev->dev, &vpu->v4l2_dev);
> @@ -1037,6 +1047,8 @@ 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:
> +	reset_control_assert(vpu->resets);
>   err_pm_disable:
>   	pm_runtime_dont_use_autosuspend(vpu->dev);
>   	pm_runtime_disable(vpu->dev);
> @@ -1056,6 +1068,7 @@ static int hantro_remove(struct platform_device *pdev)
>   	v4l2_m2m_release(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);
>   	return 0;