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

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Message-ID: <YaYV62lJ5A/Q5/WX@eze-laptop>
Date:   Tue, 30 Nov 2021 09:15:39 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     linux-media@...r.kernel.org, nicolas.dufresne@...labora.com,
        mchehab@...nel.org, robh+dt@...nel.org, mripard@...nel.org,
        wens@...e.org, p.zabel@...gutronix.de, andrzej.p@...labora.com,
        gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH v2 2/9] media: hantro: add support for reset lines

On Mon, Nov 29, 2021 at 07:26:26PM +0100, Jernej Skrabec wrote:
> Some SoCs like Allwinner H6 use reset lines for resetting Hantro G2. Add
> support for them.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>

Reviewed-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>

Thanks!

> ---
>  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;
> -- 
> 2.34.1
>