linux-kernel - Re: [PATCH v2 0/4] drm/panel: jh057n00900: Move dsi init sequence to prepare

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Message-ID: <20190726184306.GA14981@ravnborg.org>
Date:   Fri, 26 Jul 2019 20:43:06 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Guido Günther <agx@...xcpu.org>
Cc:     Purism Kernel Team <kernel@...i.sm>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] drm/panel: jh057n00900: Move dsi init sequence to
 prepare

Hi Guido.

On Fri, Jul 26, 2019 at 03:14:35PM +0200, Guido Günther wrote:
> 
> If the panel is wrapped in a panel_bridge it gets prepar()ed before the
> upstream DSI bridge which can cause hangs (e.g. with imx-nwl since clocks
> are not enabled yet). To avoid this move the panel's first DSI access to
> enable() so the upstream bridge can prepare the DSI host controller in
> it's pre_enable().
> 
> The second patch makes the disable() call symmetric to the above and the third
> one just eases debugging.
> 
> Changes from v1:
> * As per review comments by Sam Ravnborg
>   * Ignore failures to disable the backlight in jh057n_disable()
>   * Add 'drm/panel: jh057n00900: Use drm_panel_{unprepare,disable} consistently'
> * Collected Reviewed-By: Thanks Sam!
> 
> To: "Guido Günther" <agx@...xcpu.org>,Purism Kernel Team <kernel@...i.sm>,Thierry Reding <thierry.reding@...il.com>,Sam Ravnborg <sam@...nborg.org>,David Airlie <airlied@...ux.ie>,Daniel Vetter <daniel@...ll.ch>,dri-devel@...ts.freedesktop.org,linux-kernel@...r.kernel.org
> 
> 
> Guido Günther (4):
>   drm/panel: jh057n00900: Move panel DSI init to enable()
>   drm/panel: jh057n00900: Move mipi_dsi_dcs_set_display_off to disable()
>   drm/panel: jh057n00900: Print error code on all DRM_DEV_ERROR()s
>   drm/panel: jh057n00900: Use drm_panel_{unprepare,disable} consistently

Looks good. Series applied to drm-misc-next and pushed out.

	Sam