On Mon, Feb 27, 2023 at 5:41 PM Maxime Ripard <maxime@xxxxxxxxxx> wrote: > > On Mon, Feb 27, 2023 at 05:09:09PM +0530, Jagan Teki wrote: > > drmm_panel_bridge_add DRM-managed action helper is useful for the bridge > > which automatically removes the bridge when drm pointer is cleaned. > > > > Supporting the same on non-component bridges like host DSI bridge requires > > a drm pointer which is indeed available only when a panel-bridge is found. > > > > For these use cases, the caller would call the drmm_panel_bridge_add by > > passing NULL to drm pointer. > > > > So, assign the bridge->dev to drm pointer for those cases. > > > > Cc: Maxime Ripard <mripard@xxxxxxxxxx> > > Cc: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx> > > Cc: Linus Walleij <linus.walleij@xxxxxxxxxx> > > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > > Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > > --- > > Changes for v13: > > - new patch > > > > Note: use case on > > "[PATCH v13 04/18] drm: exynos: dsi: Switch to DSI panel or bridge find helper" > > > > drivers/gpu/drm/bridge/panel.c | 7 +++++++ > > 1 file changed, 7 insertions(+) > > > > diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c > > index d4b112911a99..45a0c6671000 100644 > > --- a/drivers/gpu/drm/bridge/panel.c > > +++ b/drivers/gpu/drm/bridge/panel.c > > @@ -402,6 +402,13 @@ struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm, > > if (IS_ERR(bridge)) > > return bridge; > > > > + /* > > + * For non-component bridges, like host DSI bridge the DRM pointer > > + * can be available only when a panel-bridge is found. > > + */ > > + if (!drm) > > + drm = bridge->dev; > > + > > Why can't the caller use bridge->dev? The first step of drmm_panel_bridge_add is to find the panel-bridge, so we can only get bridge->dev after this step. The caller doesn't know anything about the panel bridge it just sends a panel pointer to find the panel-bridge and then assigns bridge->dev to drm for DRM action. Please check this patch about the caller, https://patchwork.kernel.org/project/dri-devel/patch/20230227113925.875425-5-jagan@xxxxxxxxxxxxxxxxxxxx/ > > Also, where did the devm_drm_of_dsi_get_bridge go? I thought you were > going to convert it to a drm-managed version? Look like your suggestion to can't use devm_drm_of_dsi_get_bridge and call the DRM-action from the driver, that is the reason I have removed this and done the same as your previous inputs. https://lore.kernel.org/all/20230203110437.otzl2azscbujigv6@houat/ Jagan.
