Hi,
On Tue, Dec 7, 2021 at 1:33 PM Rob Clark <robdclark@xxxxxxxxx> wrote:
>
> From: Rob Clark <robdclark@xxxxxxxxxxxx>
>
> Otherwise we don't get another shot at it if the bridge probes before
> the dsi host is registered. It seems like this is what *most* (but not
> all) of the other bridges do.
>
> It looks like this was missed in the conversion to attach dsi host at
> probe time.
>
> Fixes: c3b75d4734cb ("drm/bridge: sn65dsi86: Register and attach our DSI device at probe")
> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
> ---
> v2: Drop DRM_ERROR() in favor of drm_err_probe() and shift around the
> spot where we report the error
>
> drivers/gpu/drm/bridge/ti-sn65dsi86.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index 02b490671f8f..8f1321ca819e 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -714,10 +714,8 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata)
> };
>
> host = of_find_mipi_dsi_host_by_node(pdata->host_node);
> - if (!host) {
> - DRM_ERROR("failed to find dsi host\n");
> - return -ENODEV;
> - }
> + if (!host)
> + return -EPROBE_DEFER;
>
> dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
> if (IS_ERR(dsi)) {
> @@ -1267,8 +1265,10 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
> drm_bridge_add(&pdata->bridge);
>
> ret = ti_sn_attach_host(pdata);
> - if (ret)
> + if (ret) {
> + dev_err_probe(pdata->dev, ret, "failed to attach dsi host");
nit: Needs a "\n" at the end, doesn't it?
> goto err_remove_bridge;
> + }
It's going to be a little funny now because if the
devm_mipi_dsi_attach() call fails you'll report "failed to attach dsi
host" twice (once using DRM_ERROR in ti_sn_attach_host() and once
here). Probably all the error messages could be removed from
ti_sn_attach_host() and you could rely on this new one because:
* devm_mipi_dsi_device_register_full() already appears plenty chatty.
* this is the same message that devm_mipi_dsi_attach() was printing out anyway.
In any case, it's not really a big deal, so with the "\n" added I'm
happy with my Reviewed-by.
I'm happy to apply this to to drm-misc-next tomorrow if there are no
objections. I can always add the "\n" myself unless you want to send a
v3 with it and/or want to remove more error messages. ;-)
-Doug
