linux-kernel - Re: [PATCH v4 1/4] drm: sun4i: dsi: Use drm_of_find_panel_or

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Date:   Wed, 24 Mar 2021 00:53:22 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Samuel Holland <samuel@...lland.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-amarula@...rulasolutions.com, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v4 1/4] drm: sun4i: dsi: Use drm_of_find_panel_or_bridge

Hi Jagan,

Thank you for the patch.

On Mon, Mar 22, 2021 at 07:31:49PM +0530, Jagan Teki wrote:
> Replace of_drm_find_panel with drm_of_find_panel_or_bridge
> for finding panel, this indeed help to find the bridge if
> bridge support added.
> 
> Added NULL in bridge argument, same will replace with bridge
> parameter once bridge supported.
> 
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>

Looks good, there should be no functional change.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> Changes for v4, v3:
> - none
> 
>  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index 4f5efcace68e..2e9e7b2d4145 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -21,6 +21,7 @@
>  
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>  #include <drm/drm_print.h>
>  #include <drm/drm_probe_helper.h>
> @@ -963,10 +964,14 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host,
>  			    struct mipi_dsi_device *device)
>  {
>  	struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
> -	struct drm_panel *panel = of_drm_find_panel(device->dev.of_node);
> +	struct drm_panel *panel;
> +	int ret;
> +
> +	ret = drm_of_find_panel_or_bridge(dsi->dev->of_node, 0, 0,
> +					  &panel, NULL);
> +	if (ret)
> +		return ret;
>  
> -	if (IS_ERR(panel))
> -		return PTR_ERR(panel);
>  	if (!dsi->drm || !dsi->drm->registered)
>  		return -EPROBE_DEFER;
>  

-- 
Regards,

Laurent Pinchart