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Date:   Thu, 18 Feb 2021 13:55:51 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     Benjamin Gaignard <benjamin.gaignard@collabora.com>
Cc:     ezequiel@collabora.com, p.zabel@pengutronix.de, mchehab@kernel.org,
        robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
        gregkh@linuxfoundation.org, mripard@kernel.org,
        paul.kocialkowski@bootlin.com, wens@csie.org,
        jernej.skrabec@siol.net, krzk@kernel.org, shengjiu.wang@nxp.com,
        adrian.ratiu@collabora.com, aisheng.dong@nxp.com, peng.fan@nxp.com,
        Anson.Huang@nxp.com, hverkuil-cisco@xs4all.nl,
        devel@driverdev.osuosl.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
        kernel@collabora.com, linux-arm-kernel@lists.infradead.org,
        linux-media@vger.kernel.org
Subject: Re: [PATCH v1 07/18] media: hantro: Add a field to distinguish the
 hardware versions
Message-ID: <20210218105551.GF2087@kadam>
References: <20210217080306.157876-1-benjamin.gaignard@collabora.com>
 <20210217080306.157876-8-benjamin.gaignard@collabora.com>
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On Wed, Feb 17, 2021 at 09:02:55AM +0100, Benjamin Gaignard wrote:
> Decoders hardware blocks could exist in multiple versions: add
> a field to distinguish them at runtime.
> Keep the default behavoir to be G1 hardware.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> ---
>  drivers/staging/media/hantro/hantro.h     | 5 +++++
>  drivers/staging/media/hantro/hantro_drv.c | 2 ++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/staging/media/hantro/hantro.h b/drivers/staging/media/hantro/hantro.h
> index bde65231f22f..2a566dfc2fe3 100644
> --- a/drivers/staging/media/hantro/hantro.h
> +++ b/drivers/staging/media/hantro/hantro.h
> @@ -36,6 +36,9 @@ struct hantro_codec_ops;
>  #define HANTRO_H264_DECODER	BIT(18)
>  #define HANTRO_DECODERS		0xffff0000
>  
> +#define HANTRO_G1_REV		0x6731
> +#define HANTRO_G2_REV		0x6732
> +
>  /**
>   * struct hantro_irq - irq handler and name
>   *
> @@ -170,6 +173,7 @@ hantro_vdev_to_func(struct video_device *vdev)
>   * @enc_base:		Mapped address of VPU encoder register for convenience.
>   * @dec_base:		Mapped address of VPU decoder register for convenience.
>   * @ctrl_base:		Mapped address of VPU control block.
> + * @core_hw_dec_rev	Runtime detected HW decoder core revision
>   * @vpu_mutex:		Mutex to synchronize V4L2 calls.
>   * @irqlock:		Spinlock to synchronize access to data structures
>   *			shared with interrupt handlers.
> @@ -189,6 +193,7 @@ struct hantro_dev {
>  	void __iomem *enc_base;
>  	void __iomem *dec_base;
>  	void __iomem *ctrl_base;
> +	u32 core_hw_dec_rev;
>  
>  	struct mutex vpu_mutex;	/* video_device lock */
>  	spinlock_t irqlock;
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index 0570047c7fa0..e1443c394f62 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -840,6 +840,8 @@ static int hantro_probe(struct platform_device *pdev)
>  	}
>  	vpu->enc_base = vpu->reg_bases[0] + vpu->variant->enc_offset;
>  	vpu->dec_base = vpu->reg_bases[0] + vpu->variant->dec_offset;
> +	/* by default decoder is G1 */
> +	vpu->core_hw_dec_rev = HANTRO_G1_REV;
>  

This is a write only variable.  :P  Fold it in with the patch that uses
it.

regards,
dan carpenter