linux-kernel - Re: [PATCH v2 02/12] Revert "drm/rockchip: vop2: Use regcache

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Message-ID: <20231127140412.GC977968@pengutronix.de>
Date:   Mon, 27 Nov 2023 15:04:12 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Andy Yan <andyshrk@....com>
Cc:     heiko@...ech.de, hjc@...k-chips.com,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, sebastian.reichel@...labora.com,
        kever.yang@...k-chips.com, chris.obbard@...labora.com,
        Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v2 02/12] Revert "drm/rockchip: vop2: Use regcache_sync()
 to fix suspend/resume"

On Wed, Nov 22, 2023 at 08:54:00PM +0800, Andy Yan wrote:
> From: Andy Yan <andy.yan@...k-chips.com>
> 
> This reverts commit b63a553e8f5aa6574eeb535a551817a93c426d8c.
> 
> regcache_sync will try to reload the configuration in regcache to
> hardware, but the registers of 4 Cluster windows and Esmart1/2/3 on
> the upcoming rk3588 can not be set successfully before internal PD
> power on.
> 
> Also it's better to keep the hardware register as it is before we really
> enable it.
> 
> So let's revert this version, and keep the first version:
> commit afa965a45e01 ("drm/rockchip: vop2: fix suspend/resume")
> 
> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>

Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

> ---
> 
> (no changes since v1)
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> index 312da5783362..57784d0a22a6 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> @@ -217,6 +217,8 @@ struct vop2 {
>  	struct vop2_win win[];
>  };
>  
> +static const struct regmap_config vop2_regmap_config;
> +
>  static struct vop2_video_port *to_vop2_video_port(struct drm_crtc *crtc)
>  {
>  	return container_of(crtc, struct vop2_video_port, crtc);
> @@ -883,7 +885,11 @@ static void vop2_enable(struct vop2 *vop2)
>  		return;
>  	}
>  
> -	regcache_sync(vop2->map);
> +	ret = regmap_reinit_cache(vop2->map, &vop2_regmap_config);
> +	if (ret) {
> +		drm_err(vop2->drm, "failed to reinit cache: %d\n", ret);
> +		return;
> +	}
>  
>  	if (vop2->data->soc_id == 3566)
>  		vop2_writel(vop2, RK3568_OTP_WIN_EN, 1);
> @@ -913,8 +919,6 @@ static void vop2_disable(struct vop2 *vop2)
>  
>  	pm_runtime_put_sync(vop2->dev);
>  
> -	regcache_mark_dirty(vop2->map);
> -
>  	clk_disable_unprepare(vop2->aclk);
>  	clk_disable_unprepare(vop2->hclk);
>  }
> -- 
> 2.34.1
> 
> 

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