LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Rob Clark <robdclark@gmail.com>
Cc: dri-devel <dri-devel@lists.freedesktop.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	freedreno <freedreno@lists.freedesktop.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Douglas Anderson <dianders@chromium.org>,
	Rob Clark <robdclark@chromium.org>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Robert Foss <robert.foss@linaro.org>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/4] drm/bridge: ti-sn65dsi86: Implement bridge->mode_valid()
Date: Thu, 12 Aug 2021 22:17:44 +0300	[thread overview]
Message-ID: <YRVz2MN4EDyHZYka@pendragon.ideasonboard.com> (raw)
In-Reply-To: <CAF6AEGs8g2miQz=upd0LMPg109JR7gMeEGyd1u1jQ2WYR=oWtQ@mail.gmail.com>

Hi Rob,

On Thu, Aug 12, 2021 at 12:09:12PM -0700, Rob Clark wrote:
> On Thu, Aug 12, 2021 at 11:44 AM Laurent Pinchart wrote:
> > On Wed, Aug 11, 2021 at 04:52:49PM -0700, Rob Clark wrote:
> > > From: Rob Clark <robdclark@chromium.org>
> > >
> > > For the brave new world of bridges not creating their own connectors, we
> > > need to implement the max clock limitation via bridge->mode_valid()
> > > instead of connector->mode_valid().
> > >
> > > Signed-off-by: Rob Clark <robdclark@chromium.org>
> > > ---
> > >  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 24 +++++++++++++++++++-----
> > >  1 file changed, 19 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > > index 5d3b30b2f547..38dcc49eccaf 100644
> > > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > > @@ -595,6 +595,15 @@ static struct auxiliary_driver ti_sn_aux_driver = {
> > >       .id_table = ti_sn_aux_id_table,
> > >  };
> > >
> > > +static enum drm_mode_status check_mode(const struct drm_display_mode *mode)
> > > +{
> > > +     /* maximum supported resolution is 4K at 60 fps */
> > > +     if (mode->clock > 594000)
> > > +             return MODE_CLOCK_HIGH;
> > > +
> > > +     return MODE_OK;
> > > +}
> > > +
> > >  /* -----------------------------------------------------------------------------
> > >   * DRM Connector Operations
> > >   */
> > > @@ -616,11 +625,7 @@ static enum drm_mode_status
> > >  ti_sn_bridge_connector_mode_valid(struct drm_connector *connector,
> > >                                 struct drm_display_mode *mode)
> > >  {
> > > -     /* maximum supported resolution is 4K at 60 fps */
> > > -     if (mode->clock > 594000)
> > > -             return MODE_CLOCK_HIGH;
> > > -
> > > -     return MODE_OK;
> > > +     return check_mode(mode);
> >
> > Do we need to implement the connector .mode_valid() operation, given
> > that the bridge is linked in the chain ?
> 
> My understanding is that we need to keep it for display drivers that
> are not converted to NO_CONNECTOR..
> 
> But AFAIK snapdragon is the only upstream user of this bridge, so
> after the drm/msm/dsi patch lands we could probably garbage collect
> the connector support.

Even in the !NO_CONNECTOR case, the bridge will still be linked in the
chain, so the atomic helpers should call the bridge .mode_valid() in
addition to the connector .mode_valid(). I think the connector operation
is redundant.

> > >  }
> > >
> > >  static struct drm_connector_helper_funcs ti_sn_bridge_connector_helper_funcs = {
> > > @@ -763,6 +768,14 @@ static void ti_sn_bridge_detach(struct drm_bridge *bridge)
> > >       drm_dp_aux_unregister(&bridge_to_ti_sn65dsi86(bridge)->aux);
> > >  }
> > >
> > > +static enum drm_mode_status
> > > +ti_sn_bridge_mode_valid(struct drm_bridge *bridge,
> > > +                     const struct drm_display_info *info,
> > > +                     const struct drm_display_mode *mode)
> > > +{
> > > +     return check_mode(mode);
> > > +}
> > > +
> > >  static void ti_sn_bridge_disable(struct drm_bridge *bridge)
> > >  {
> > >       struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
> > > @@ -1118,6 +1131,7 @@ static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
> > >  static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
> > >       .attach = ti_sn_bridge_attach,
> > >       .detach = ti_sn_bridge_detach,
> > > +     .mode_valid = ti_sn_bridge_mode_valid,
> > >       .pre_enable = ti_sn_bridge_pre_enable,
> > >       .enable = ti_sn_bridge_enable,
> > >       .disable = ti_sn_bridge_disable,

-- 
Regards,

Laurent Pinchart

  reply	other threads:[~2021-08-12 19:17 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 23:52 [PATCH 0/4] drm/msm+ti-sn65dsi86: Fix NO_CONNECTOR fallout Rob Clark
2021-08-11 23:52 ` [PATCH 1/4] drm/bridge: ti-sn65dsi86: Avoid creating multiple connectors Rob Clark
2021-08-12  0:25   ` Stephen Boyd
2021-08-12 16:38   ` Laurent Pinchart
2021-08-12 16:54   ` Doug Anderson
2021-08-12 17:11     ` Rob Clark
2021-08-11 23:52 ` [PATCH 2/4] drm/msm/dsi: Support NO_CONNECTOR bridges Rob Clark
2021-08-12 16:44   ` Laurent Pinchart
     [not found]   ` <YRVa6Wy/24FUQEUw@ravnborg.org>
2021-08-12 17:45     ` Rob Clark
2021-08-11 23:52 ` [PATCH 3/4] drm/bridge: ti-sn65dsi86: Implement bridge->mode_valid() Rob Clark
2021-08-12 17:23   ` Doug Anderson
2021-08-12 18:44   ` Laurent Pinchart
2021-08-12 19:09     ` Rob Clark
2021-08-12 19:17       ` Laurent Pinchart [this message]
2021-08-11 23:52 ` [PATCH 4/4] drm/bridge: ti-sn65dsi86: Add NO_CONNECTOR support Rob Clark
2021-08-12 17:22   ` Doug Anderson
2021-08-12 19:26   ` Laurent Pinchart
2021-08-12 20:08     ` Doug Anderson
2021-09-20 18:32       ` Rob Clark
2021-09-23  0:39         ` Laurent Pinchart

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YRVz2MN4EDyHZYka@pendragon.ideasonboard.com \
    --to=laurent.pinchart@ideasonboard.com \
    --cc=a.hajda@samsung.com \
    --cc=airlied@linux.ie \
    --cc=daniel@ffwll.ch \
    --cc=dianders@chromium.org \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=freedreno@lists.freedesktop.org \
    --cc=jernej.skrabec@gmail.com \
    --cc=jonas@kwiboo.se \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=narmstrong@baylibre.com \
    --cc=robdclark@chromium.org \
    --cc=robdclark@gmail.com \
    --cc=robert.foss@linaro.org \
    --cc=swboyd@chromium.org \
    --subject='Re: [PATCH 3/4] drm/bridge: ti-sn65dsi86: Implement bridge->mode_valid()' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).