From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
dri-devel@lists.freedesktop.org,
Jernej Skrabec <jernej.skrabec@siol.net>,
Neil Armstrong <narmstrong@baylibre.com>,
Jonas Karlman <jonas@kwiboo.se>,
Kieran Bingham <kieran.bingham@ideasonboard.com>,
linux-renesas-soc@vger.kernel.org,
Andrzej Hajda <a.hajda@samsung.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH 27/27] drm: Add default modes for connectors in unknown state
Date: Wed, 24 Jun 2020 04:12:09 +0300 [thread overview]
Message-ID: <20200624011209.GU5870@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20200621084000.GM74146@ravnborg.org>
Hi Sam,
On Sun, Jun 21, 2020 at 10:40:00AM +0200, Sam Ravnborg wrote:
> On Tue, May 26, 2020 at 04:15:05AM +0300, Laurent Pinchart wrote:
> > The DRM CRTC helpers add default modes to connectors in the connected
> > state if no mode can be retrieved from the connector. This behaviour is
> > useful for VGA or DVI outputs that have no connected DDC bus. However,
> > in such cases, the status of the output usually can't be retrieved and
> > is reported as connector_status_unknown.
> >
> > Extend the addition of default modes to connectors in an unknown state
> > to support outputs that can retrieve neither the modes nor the
> > connection status.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>
> From your description sounds like an OK approach.
> But this is not something I feel too familiar with.
> Acked-by: Sam Ravnborg <sam@ravnborg.org>
Thanks for the ack. I'd like to have Daniel's (CC'ed) feedback on this
too.
> > ---
> > drivers/gpu/drm/drm_probe_helper.c | 3 ++-
> > include/drm/drm_modeset_helper_vtables.h | 8 +++++++-
> > 2 files changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> > index f5d141e0400f..9055d9573c90 100644
> > --- a/drivers/gpu/drm/drm_probe_helper.c
> > +++ b/drivers/gpu/drm/drm_probe_helper.c
> > @@ -491,7 +491,8 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> > if (count == 0 && connector->status == connector_status_connected)
> > count = drm_add_override_edid_modes(connector);
> >
> > - if (count == 0 && connector->status == connector_status_connected)
> > + if (count == 0 && (connector->status == connector_status_connected ||
> > + connector->status == connector_status_unknown))
> > count = drm_add_modes_noedid(connector, 1024, 768);
> > count += drm_helper_probe_add_cmdline_mode(connector);
> > if (count == 0)
> > diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> > index 421a30f08463..afe55e2e93d2 100644
> > --- a/include/drm/drm_modeset_helper_vtables.h
> > +++ b/include/drm/drm_modeset_helper_vtables.h
> > @@ -876,13 +876,19 @@ struct drm_connector_helper_funcs {
> > * The usual way to implement this is to cache the EDID retrieved in the
> > * probe callback somewhere in the driver-private connector structure.
> > * In this function drivers then parse the modes in the EDID and add
> > - * them by calling drm_add_edid_modes(). But connectors that driver a
> > + * them by calling drm_add_edid_modes(). But connectors that drive a
> > * fixed panel can also manually add specific modes using
> > * drm_mode_probed_add(). Drivers which manually add modes should also
> > * make sure that the &drm_connector.display_info,
> > * &drm_connector.width_mm and &drm_connector.height_mm fields are
> > * filled in.
> > *
> > + * Note that the caller function will automatically add standard VESA
> > + * DMT modes up to 1024x768 if the .get_modes() helper operation returns
> > + * no mode and if the connector status is connector_status_connected or
> > + * connector_status_unknown. There is no need to call
> > + * drm_add_edid_modes() manually in that case.
> > + *
> > * Virtual drivers that just want some standard VESA mode with a given
> > * resolution can call drm_add_modes_noedid(), and mark the preferred
> > * one using drm_set_preferred_mode().
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2020-06-24 1:12 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 1:14 [PATCH 00/27] Converter R-Car DU to the DRM bridge connector helper Laurent Pinchart
2020-05-26 1:14 ` [PATCH 01/27] drm: bridge: adv7511: Split EDID read to a separate function Laurent Pinchart
2020-05-26 1:14 ` [PATCH 02/27] drm: bridge: adv7511: Split connector creation " Laurent Pinchart
2020-05-26 1:14 ` [PATCH 03/27] drm: bridge: adv7511: Implement bridge connector operations Laurent Pinchart
2020-06-21 8:25 ` Sam Ravnborg
2020-05-26 1:14 ` [PATCH 04/27] drm: bridge: adv7511: Make connector creation optional Laurent Pinchart
2020-05-26 1:14 ` [PATCH 05/27] drm: bridge: Return NULL on error from drm_bridge_get_edid() Laurent Pinchart
2020-06-21 8:26 ` Sam Ravnborg
2020-05-26 1:14 ` [PATCH 06/27] drm: bridge: simple-bridge: Delegate operations to next bridge Laurent Pinchart
2020-05-26 1:14 ` [PATCH 07/27] drm: bridge: simple-bridge: Make connector creation optional Laurent Pinchart
2020-05-26 1:14 ` [PATCH 08/27] drm: rcar-du: lvds: Convert to DRM panel bridge helper Laurent Pinchart
2020-05-26 1:14 ` [PATCH 09/27] drm: edid: Constify connector argument to infoframe functions Laurent Pinchart
2020-06-21 8:27 ` Sam Ravnborg
2020-05-26 1:14 ` [PATCH 10/27] drm: bridge: Pass drm_display_info to drm_bridge_funcs .mode_valid() Laurent Pinchart
2020-05-26 12:51 ` Neil Armstrong
2020-05-26 12:59 ` Boris Brezillon
2020-05-26 14:05 ` Guido Günther
2020-05-26 1:14 ` [PATCH 11/27] drm: bridge: dw-hdmi: Pass private data pointer to .mode_valid() Laurent Pinchart
2020-05-26 9:44 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 12/27] drm: bridge: dw-hdmi: Pass private data pointer to .configure_phy() Laurent Pinchart
2020-05-26 9:45 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 13/27] drm: bridge: dw-hdmi: Remove unused field from dw_hdmi_plat_data Laurent Pinchart
2020-05-26 9:45 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 14/27] drm: meson: dw-hdmi: Use dw_hdmi context to replace hack Laurent Pinchart
2020-05-26 12:32 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 15/27] drm: bridge: dw-hdmi: Pass drm_display_info to .mode_valid() Laurent Pinchart
2020-05-26 9:46 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 16/27] drm: bridge: dw-hdmi: Constify mode argument to dw_hdmi_phy_ops .init() Laurent Pinchart
2020-05-26 9:46 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 17/27] drm: bridge: dw-hdmi: Constify mode argument to internal functions Laurent Pinchart
2020-05-26 9:46 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 18/27] drm: bridge: dw-hdmi: Pass drm_display_info to dw_hdmi_support_scdc() Laurent Pinchart
2020-05-26 9:48 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 19/27] drm: bridge: dw-hdmi: Split connector creation to a separate function Laurent Pinchart
2020-05-26 9:49 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 20/27] drm: bridge: dw-hdmi: Store current connector in struct dw_hdmi Laurent Pinchart
2020-05-26 12:29 ` Neil Armstrong
2020-05-26 1:14 ` [PATCH 21/27] drm: bridge: dw-hdmi: Pass drm_connector to internal functions as needed Laurent Pinchart
2020-05-26 12:29 ` Neil Armstrong
2020-05-26 1:15 ` [PATCH 22/27] drm: bridge: dw-hdmi: Make connector creation optional Laurent Pinchart
2020-05-26 12:35 ` Neil Armstrong
2020-06-07 1:19 ` Laurent Pinchart
2020-05-26 1:15 ` [PATCH 23/27] drm: bridge: dw-hdmi: Attach to next bridge if available Laurent Pinchart
2020-05-26 12:50 ` Neil Armstrong
2020-05-26 14:23 ` Jonas Karlman
2020-06-07 1:24 ` Laurent Pinchart
2020-06-07 1:22 ` Laurent Pinchart
2020-05-26 1:15 ` [PATCH 24/27] drm: rcar-du: dw-hdmi: Set output port number Laurent Pinchart
2020-05-26 1:15 ` [PATCH 25/27] drm: rcar-du: Fix error handling in rcar_du_encoder_init() Laurent Pinchart
2020-05-26 1:15 ` [PATCH 26/27] drm: rcar-du: Use drm_bridge_connector_init() helper Laurent Pinchart
2020-05-26 1:15 ` [PATCH 27/27] drm: Add default modes for connectors in unknown state Laurent Pinchart
2020-06-21 8:40 ` Sam Ravnborg
2020-06-24 1:12 ` Laurent Pinchart [this message]
2020-06-24 7:23 ` Daniel Vetter
2020-06-24 15:24 ` Alex Deucher
2020-06-24 19:31 ` Daniel Vetter
2020-06-24 19:40 ` Alex Deucher
2020-06-25 7:56 ` Daniel Vetter
2020-06-25 7:57 ` Daniel Vetter
2020-06-25 10:31 ` Pekka Paalanen
2020-06-25 10:44 ` Daniel Vetter
2020-06-26 8:59 ` Pekka Paalanen
2020-06-26 9:25 ` Daniel Stone
2020-06-26 13:35 ` Daniel Vetter
2020-06-24 22:47 ` Laurent Pinchart
2020-06-23 18:55 ` [PATCH 00/27] Converter R-Car DU to the DRM bridge connector helper Sam Ravnborg
2020-06-25 8:48 ` Liu Ying
2020-06-27 19:55 ` Sam Ravnborg
2020-06-28 8:28 ` Laurent Pinchart
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