linux-kernel - Re: [PATCH v3 05/43] drm/bridge: analogix_dp: Don't power bridge in analogix_dp

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Message-id: <9a8ee029-79cf-f07e-0a56-f5a0671588dc@samsung.com>
Date:   Thu, 01 Mar 2018 14:37:57 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Thierry Escande <thierry.escande@...labora.com>,
        Archit Taneja <architt@...eaurora.org>,
        Inki Dae <inki.dae@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sandy Huang <hjc@...k-chips.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Tomasz Figa <tfiga@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Zain Wang <wzz@...k-chips.com>, Lin Huang <hl@...k-chips.com>,
        Douglas Anderson <dianders@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Yakir Yang <ykk@...k-chips.com>,
        Ørjan Eide <orjan.eide@....com>,
        Mark Yao <mark.yao@...k-chips.com>,
        Haixia Shi <hshi@...omium.org>
Subject: Re: [PATCH v3 05/43] drm/bridge: analogix_dp: Don't power bridge in
 analogix_dp_bind

Hi,

On 2018-01-30 21:28, Thierry Escande wrote:
> From: zain wang <wzz@...k-chips.com>
>
> The bridge does not need to be powered in analogix_dp_bind(), so
> remove the calls to pm_runtime_get()/phy_power_on()/analogix_dp_init_dp()
> as well as their power-off counterparts.
>
> Cc: Stéphane Marchesin <marcheu@...omium.org>
> Signed-off-by: zain wang <wzz@...k-chips.com>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> [the patch originally just removed the power_on portion, seanpaul removed
> the power off code as well as improved the commit message]
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
> ---
>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 10 ----------
>   1 file changed, 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index cb5e18d6ba04..1477ea9ba85d 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -1382,11 +1382,6 @@ analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   
>   	pm_runtime_enable(dev);
>   
> -	pm_runtime_get_sync(dev);
> -	phy_power_on(dp->phy);
> -
> -	analogix_dp_init_dp(dp);
> -
>   	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
>   					analogix_dp_hardirq,
>   					analogix_dp_irq_thread,
> @@ -1414,15 +1409,10 @@ analogix_dp_bind(struct device *dev, struct drm_device *drm_dev,
>   		goto err_disable_pm_runtime;
>   	}
>   
> -	phy_power_off(dp->phy);
> -	pm_runtime_put(dev);
> -
>   	return dp;
>   
>   err_disable_pm_runtime:
>   
> -	phy_power_off(dp->phy);
> -	pm_runtime_put(dev);
>   	pm_runtime_disable(dev);
>   
>   	return ERR_PTR(ret);

Once this change is applied, there is also no need to keep dp->clock
prepared & enabled between bind/unbind.

analogix_dp_set_bridge() and analogix_dp_bridge_disable() properly manage
dp->clock on their own.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland