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Subject: Re: [PATCH] Revert
 "drm/bridge: adv7511: Attach to DSI host at probe time"
To:     Rob Clark <robdclark@gmail.com>, dri-devel@lists.freedesktop.org
Cc:     Matt Redfearn <matt.redfearn@thinci.com>,
        Rob Clark <robdclark@chromium.org>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Sam Ravnborg <sam@ravnborg.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        open list <linux-kernel@vger.kernel.org>
From:   Andrzej Hajda <a.hajda@samsung.com>
Message-ID: <5b277456-2508-981c-7909-dde5f38f8ef6@samsung.com>
Date:   Fri, 13 Sep 2019 10:25:04 +0200
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On 29.08.2019 20:08, Rob Clark wrote:
> From: Rob Clark <robdclark@chromium.org>
>
> This reverts commit 83f35bc3a852f1c3892c7474998c5cec707c7ba3.
>
> This commit the wrong direction, we should really be changing panel
> framework to attach dsi host after probe, rather than introducing
> the same probe-order problem that panels already have to bridges.
>
> The reason is, that in order to deal with devices where display is
> enabled by bootloader and efifb/simplefb is used until the real
> driver probes, we need to be careful to not touch the hardware
> until we have all the pieces probed and ready to go, otherwise you
> will kill the working display, leaving yourself (at least, in the
> case of real consumer devices that do not have a debug UART) with
> no good way to debug what went wrong.
>
> Signed-off-by: Rob Clark <robdclark@chromium.org>


Applied to drm-misc-next-fixes, with changed commit message - I hope it
is OK for you.


Regards

Andrzej


> ---
>  drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> index 98bccace8c1c..f6d2681f6927 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -874,6 +874,9 @@ static int adv7511_bridge_attach(struct drm_bridge *bridge)
>  				 &adv7511_connector_helper_funcs);
>  	drm_connector_attach_encoder(&adv->connector, bridge->encoder);
>  
> +	if (adv->type == ADV7533)
> +		ret = adv7533_attach_dsi(adv);
> +
>  	if (adv->i2c_main->irq)
>  		regmap_write(adv->regmap, ADV7511_REG_INT_ENABLE(0),
>  			     ADV7511_INT0_HPD);
> @@ -1219,17 +1222,8 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
>  	drm_bridge_add(&adv7511->bridge);
>  
>  	adv7511_audio_init(dev, adv7511);
> -
> -	if (adv7511->type == ADV7533) {
> -		ret = adv7533_attach_dsi(adv7511);
> -		if (ret)
> -			goto err_remove_bridge;
> -	}
> -
>  	return 0;
>  
> -err_remove_bridge:
> -	drm_bridge_remove(&adv7511->bridge);
>  err_unregister_cec:
>  	i2c_unregister_device(adv7511->i2c_cec);
>  	if (adv7511->cec_clk)