linux-kernel - Re: [Freedreno] [PATCH 3/3] drm/msm/dsi: make sure we have panel or bridge earlier

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Date:   Tue, 2 Jul 2019 14:30:39 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Rob Clark <robdclark@...il.com>
Cc:     "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Rob Clark <robdclark@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        lkml <linux-kernel@...r.kernel.org>, Sean Paul <sean@...rly.run>,
        Sibi Sankar <sibis@...eaurora.org>,
        Daniel Vetter <daniel@...ll.ch>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>
Subject: Re: [Freedreno] [PATCH 3/3] drm/msm/dsi: make sure we have panel or
 bridge earlier

On Sun, Jun 30, 2019 at 7:16 AM Rob Clark <robdclark@...il.com> wrote:
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1824,6 +1824,20 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi)
>                 goto fail;
>         }
>
> +       /*
> +        * Make sure we have panel or bridge early, before we start
> +        * touching the hw.  If bootloader enabled the display, we
> +        * want to be sure to keep it running until the bridge/panel
> +        * is probed and we are all ready to go.  Otherwise we'll
> +        * kill the display and then -EPROBE_DEFER
> +        */
> +       if (IS_ERR(of_drm_find_panel(msm_host->device_node)) &&
> +                       !of_drm_find_bridge(msm_host->device_node)) {
> +               pr_err("%s: no panel or bridge yet\n", __func__);

pr_err() doesn't seem right for a probe defer condition.  pr_dbg?

> +               return -EPROBE_DEFER;
> +       }
> +
> +

Tested-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>