linux-kernel - Re: [PATCH v5 12/20] drm/rockchip: analogix_dp: Add support to get panel from the DP AUX bus

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Message-ID: <d7zpv6qt52mhny54dejw4yqlp2k2c437op7qmepqe27pufplqk@64xvohrz7h2q>
Date: Thu, 9 Jan 2025 14:48:15 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Damon Ding <damon.ding@...k-chips.com>
Cc: heiko@...ech.de, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, rfoss@...nel.org, vkoul@...nel.org, 
	sebastian.reichel@...labora.com, cristian.ciocaltea@...labora.com, l.stach@...gutronix.de, 
	andy.yan@...k-chips.com, hjc@...k-chips.com, algea.cao@...k-chips.com, 
	kever.yang@...k-chips.com, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-phy@...ts.infradead.org
Subject: Re: [PATCH v5 12/20] drm/rockchip: analogix_dp: Add support to get
 panel from the DP AUX bus

On Thu, Jan 09, 2025 at 11:27:17AM +0800, Damon Ding wrote:
> Move drm_of_find_panel_or_bridge() a little later and combine it with
> component_add() into a new function rockchip_dp_link_panel(). The function
> will serve as done_probing() callback of devm_of_dp_aux_populate_bus(),
> aiding to support for obtaining the eDP panel via the DP AUX bus.
> 
> If failed to get the panel from the DP AUX bus, it will then try the other
> way to get panel information through the platform bus.
> 
> In addition, use dev_err() instead of drm_err() in rockchip_dp_poweron()
> , which will be called before rockchip_dp_bind().
> 
> Signed-off-by: Damon Ding <damon.ding@...k-chips.com>
> 
> ---
> 
> Changes in v4:
> - Use done_probing() to call drm_of_find_panel_or_bridge() and
>   component_add() when getting panel from the DP AUX bus
> 
> Changes in v5:
> - Use the functions exported by the Analogix side to get the pointers of
>   struct analogix_dp_plat_data and struct drm_dp_aux.
> - Use dev_err() instead of drm_err() in rockchip_dp_poweron().
> 
> ---
>  .../gpu/drm/rockchip/analogix_dp-rockchip.c   | 41 ++++++++++++++-----
>  1 file changed, 30 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 0957d3c5d31d..3ae01b870f49 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -124,13 +124,13 @@ static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
>  
>  	ret = clk_prepare_enable(dp->pclk);
>  	if (ret < 0) {
> -		drm_err(dp->drm_dev, "failed to enable pclk %d\n", ret);
> +		dev_err(dp->dev, "failed to enable pclk %d\n", ret);


why?

>  		return ret;
>  	}
>  
>  	ret = rockchip_dp_pre_init(dp);
>  	if (ret < 0) {
> -		drm_err(dp->drm_dev, "failed to dp pre init %d\n", ret);
> +		dev_err(dp->dev, "failed to dp pre init %d\n", ret);
>  		clk_disable_unprepare(dp->pclk);
>  		return ret;
>  	}

-- 
With best wishes
Dmitry