Hi Jagan,
Quoting Jagan Teki (2021-11-30 07:38:57)
> Hi Kieran,
>
> On Fri, Nov 26, 2021 at 3:45 PM Kieran Bingham
> <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> wrote:
> >
> > The bridge probe ordering for DSI devices has been clarified and further
> > documented in
> >
> > To support connecting with the SN65DSI86 device after commit c3b75d4734cb
> > ("drm/bridge: sn65dsi86: Register and attach our DSI device at probe"),
> > update to the new probe ordering to remove a perpetual -EPROBE_DEFER
> > loop between the two devices.
> >
> > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 48 +++++++++++++------------
> > 1 file changed, 26 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> > index 833f4480bdf3..f783bacee8da 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
> > @@ -639,6 +639,8 @@ static int rcar_mipi_dsi_host_attach(struct mipi_dsi_host *host,
> > struct mipi_dsi_device *device)
> > {
> > struct rcar_mipi_dsi *dsi = host_to_rcar_mipi_dsi(host);
> > + struct drm_panel *panel;
> > + int ret;
> >
> > if (device->lanes > dsi->num_data_lanes)
> > return -EINVAL;
> > @@ -646,12 +648,36 @@ static int rcar_mipi_dsi_host_attach(struct mipi_dsi_host *host,
> > dsi->lanes = device->lanes;
> > dsi->format = device->format;
> >
> > + ret = drm_of_find_panel_or_bridge(dsi->dev->of_node, 1, 0, &panel,
> > + &dsi->next_bridge);
> > + if (ret) {
> > + dev_err_probe(dsi->dev, ret, "could not find next bridge\n");
> > + return ret;
> > + }
> > +
> > + if (!dsi->next_bridge) {
> > + dsi->next_bridge = devm_drm_panel_bridge_add(dsi->dev, panel);
> > + if (IS_ERR(dsi->next_bridge)) {
> > + dev_err(dsi->dev, "failed to create panel bridge\n");
> > + return PTR_ERR(dsi->next_bridge);
> > + }
> > + }
>
> Can we use the new function devm_drm_of_get_bridge instead of the entire code?
I've just tried this, and it works, so yes we can.
I'll update the branch and re-send it for Laurent to collect and
apply/squash whichever works best.
Thanks.
Kieran
>
> Jagan.
