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Date: Fri, 1 Oct 2021 11:02:27 -0700
From: Rob Clark <robdclark@...il.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: dri-devel <dri-devel@...ts.freedesktop.org>,
freedreno <freedreno@...ts.freedesktop.org>,
Douglas Anderson <dianders@...omium.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Rob Clark <robdclark@...omium.org>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Abhinav Kumar <abhinavk@...eaurora.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] drm/msm/dsi: Support NO_CONNECTOR bridges
On Fri, Oct 1, 2021 at 10:28 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On 21/09/2021 01:57, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > For now, since we have a mix of bridges which support this flag, which
> > which do *not* support this flag, or work both ways, try it once with
> > NO_CONNECTOR and then fall back to the old way if that doesn't work.
> > Eventually we can drop the fallback path.
> >
> > v2: Add missing drm_connector_attach_encoder() so display actually comes
> > up when the bridge properly handles the NO_CONNECTOR flag
> >
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>
> I think this patch can go through the drm/msm, while two other patches
> would need to through the drm-misc. Is it correct?
Correct, I made sure things worked in either order (ie. with msm patch
but without bridge patches, and visa versa), so they can land through
different trees
BR,
-R
>
> > ---
> > drivers/gpu/drm/msm/Kconfig | 2 ++
> > drivers/gpu/drm/msm/dsi/dsi_manager.c | 50 ++++++++++++++++++++-------
> > 2 files changed, 39 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> > index e9c6af78b1d7..36e5ba3ccc28 100644
> > --- a/drivers/gpu/drm/msm/Kconfig
> > +++ b/drivers/gpu/drm/msm/Kconfig
> > @@ -14,6 +14,8 @@ config DRM_MSM
> > select REGULATOR
> > select DRM_KMS_HELPER
> > select DRM_PANEL
> > + select DRM_BRIDGE
> > + select DRM_PANEL_BRIDGE
> > select DRM_SCHED
> > select SHMEM
> > select TMPFS
> > diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> > index c41d39f5b7cf..e25877073d31 100644
> > --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> > +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> > @@ -3,6 +3,8 @@
> > * Copyright (c) 2015, The Linux Foundation. All rights reserved.
> > */
> >
> > +#include "drm/drm_bridge_connector.h"
> > +
> > #include "msm_kms.h"
> > #include "dsi.h"
> >
> > @@ -688,10 +690,10 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
> > {
> > struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
> > struct drm_device *dev = msm_dsi->dev;
> > + struct drm_connector *connector;
> > struct drm_encoder *encoder;
> > struct drm_bridge *int_bridge, *ext_bridge;
> > - struct drm_connector *connector;
> > - struct list_head *connector_list;
> > + int ret;
> >
> > int_bridge = msm_dsi->bridge;
> > ext_bridge = msm_dsi->external_bridge =
> > @@ -699,22 +701,44 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
> >
> > encoder = msm_dsi->encoder;
> >
> > - /* link the internal dsi bridge to the external bridge */
> > - drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
> > -
> > /*
> > - * we need the drm_connector created by the external bridge
> > - * driver (or someone else) to feed it to our driver's
> > - * priv->connector[] list, mainly for msm_fbdev_init()
> > + * Try first to create the bridge without it creating its own
> > + * connector.. currently some bridges support this, and others
> > + * do not (and some support both modes)
> > */
> > - connector_list = &dev->mode_config.connector_list;
> > + ret = drm_bridge_attach(encoder, ext_bridge, int_bridge,
> > + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> > + if (ret == -EINVAL) {
> > + struct drm_connector *connector;
> > + struct list_head *connector_list;
> > +
> > + /* link the internal dsi bridge to the external bridge */
> > + drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
> > +
> > + /*
> > + * we need the drm_connector created by the external bridge
> > + * driver (or someone else) to feed it to our driver's
> > + * priv->connector[] list, mainly for msm_fbdev_init()
> > + */
> > + connector_list = &dev->mode_config.connector_list;
> >
> > - list_for_each_entry(connector, connector_list, head) {
> > - if (drm_connector_has_possible_encoder(connector, encoder))
> > - return connector;
> > + list_for_each_entry(connector, connector_list, head) {
> > + if (drm_connector_has_possible_encoder(connector, encoder))
> > + return connector;
> > + }
> > +
> > + return ERR_PTR(-ENODEV);
> > + }
> > +
> > + connector = drm_bridge_connector_init(dev, encoder);
> > + if (IS_ERR(connector)) {
> > + DRM_ERROR("Unable to create bridge connector\n");
> > + return ERR_CAST(connector);
> > }
> >
> > - return ERR_PTR(-ENODEV);
> > + drm_connector_attach_encoder(connector, encoder);
> > +
> > + return connector;
> > }
> >
> > void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
> >
>
>
> --
> With best wishes
> Dmitry
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