[PATCH 00/27] Converter R-Car DU to the DRM bridge connector helper
Liu Ying
victor.liu at oss.nxp.com
Thu Jun 25 08:48:01 UTC 2020
Hi Sam,
On Tue, 2020-06-23 at 20:55 +0200, Sam Ravnborg wrote:
> Hi Laurent.
>
> On Tue, May 26, 2020 at 04:14:38AM +0300, Laurent Pinchart wrote:
> > Hello,
> >
> > This patch series converts the R-Car DU driver to use the DRM
> > bridge
> > connector helper drm_bridge_connector_init().
> >
> > The bulk of the series is conversion of the adv7511, simple-bridge,
> > rcar-lbds and dw-hdmi drivers to make connector creation optional
> > (through the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag).
> >
> > The series starts with the adv7511 driver, previously posted as
> > "[PATCH
> > 0/4] drm: bridge: adv7511: Enable usage with DRM bridge connector
> > helper" ([1]). Patches 01/27 to 04/27 incorporate all the received
> > review comments.
> >
> > The next three patches address the simple-bridge driver, previously
> > posted as "[PATCH 0/2] drm: bridge: simple-bridge: Enable usage
> > with DRM
> > bridge connector helper". Patch 05/27 is an additional fix that
> > stems
> > from the review, and patches 06/27 and 07/27 incorporate all the
> > received review comments.
> >
> > Patch 08/27 is a new patch that addresses the rcar-lvds driver.
> > Instead
> > of implementing direct support for DRM_BRIDGE_ATTACH_NO_CONNECTOR,
> > it
> > simply removes code that shouldn't have been in the driver in the
> > first
> > place by switching to the panel bridge helper.
> >
> > Patches 09/27 to 22/27 then address the dw-hdmi driver. That's a
> > more
> > sizeable rework, due to the fact that the driver implements a mid-
> > layer
> > for platform-specific glue, with the internal drm_connector being
> > used
> > throughout the whole code. There's no rocket science there, but
> > patch
> > 10/27 should be noted for adding a new argument to the
> > drm_bridge_funcs.mode_valid() function. Please see individual
> > patches
> > for details.
> >
> > Patch 23/27 adds support to the dw-hdmi driver to attach to a
> > downstream
> > bridge if one is specified in DT. As the DT port number
> > corresponding to
> > the video output differs between platforms that integrate the dw-
> > hdmi
> > (some of them even don't have a video output port, which should
> > probably
> > be fixed, but that's out of scope for this series), the port number
> > has
> > to be specified by the platform glue layer. Patch 24/27 does so for
> > the
> > R-Car dw-hdmi driver.
> >
> > Patch 25/27 is a drive-by fix for an error path issue in the rcar-
> > du
> > driver. Patch 26/27 finally makes use of the
> > drm_bridge_connector_init()
> > helper.
> >
> > Unfortunately, this breaks the VGA output on R-Car Gen3 platforms.
> > On
> > those platforms, the VGA DDC lines are not connected, and there is
> > no
> > mean for software to detect the VGA output connection status. When
> > the
> > simple-bridge driver creates a connector, it automatically adds
> > default
> > modes when no DDC is available. This behavious is also present int
> > the
> > DRM probe helper drm_helper_probe_single_connector_modes(), but
> > only
> > when the connector status is connector_status_connected. As the
> > driver
> > (rightfully) reports connector_status_unconnected, no modes are
> > added.
> > Patch 27/27 fixes this issue by extending addition of default modes
> > in
> > drm_helper_probe_single_connector_modes() when the output status is
> > unknown. An alternative approach would be to implement this
> > behaviour in
> > the bridge connector helper (drm_bridge_connector.c).
> >
> > All the modified drivers have been compile-tested, and the series
> > has
> > been tested on a Renesas R-Car Salvator-XS board with the VGA, HDMI
> > and
> > LVDS outputs.
> >
> > [1]
> > https://lore.kernel.org/dri-devel/20200409004610.12346-1-laurent.pinchart+renesas@ideasonboard.com/
> > [2]
> > https://lore.kernel.org/dri-devel/20200409003636.11792-1-laurent.pinchart+renesas@ideasonboard.com/
>
> As we briefly discussed on IRC the first 21 patches are now applied
> to
> drm-misc-next.
I see patch '[22/27] drm: bridge: dw-hdmi: Make connector creation
optional' is applied to drm-misc-next.
That patch would introduce an uninitialized mutex accessing issue as I
mentioned in the patch[1]. And, the patch intends to fix the issue in
the first place.
[1] https://patchwork.freedesktop.org/patch/370560/
Regards,
Liu Ying
> The rcar-du specific patches was left out and the last patch was
> likewise not applied in this round- mostly because it was the coming
> after several rcar-du patches and I was not sure if there was some
> dependencies to consider.
>
> With this set in we have more examples in the tree how to do proper
> bridges which is good.
>
> While applying the new r-bs was ofc added.
>
> Sam
>
> >
> > Laurent Pinchart (27):
> > drm: bridge: adv7511: Split EDID read to a separate function
> > drm: bridge: adv7511: Split connector creation to a separate
> > function
> > drm: bridge: adv7511: Implement bridge connector operations
> > drm: bridge: adv7511: Make connector creation optional
> > drm: bridge: Return NULL on error from drm_bridge_get_edid()
> > drm: bridge: simple-bridge: Delegate operations to next bridge
> > drm: bridge: simple-bridge: Make connector creation optional
> > drm: rcar-du: lvds: Convert to DRM panel bridge helper
> > drm: edid: Constify connector argument to infoframe functions
> > drm: bridge: Pass drm_display_info to drm_bridge_funcs
> > .mode_valid()
> > drm: bridge: dw-hdmi: Pass private data pointer to .mode_valid()
> > drm: bridge: dw-hdmi: Pass private data pointer to
> > .configure_phy()
> > drm: bridge: dw-hdmi: Remove unused field from dw_hdmi_plat_data
> > drm: meson: dw-hdmi: Use dw_hdmi context to replace hack
> > drm: bridge: dw-hdmi: Pass drm_display_info to .mode_valid()
> > drm: bridge: dw-hdmi: Constify mode argument to dw_hdmi_phy_ops
> > .init()
> > drm: bridge: dw-hdmi: Constify mode argument to internal
> > functions
> > drm: bridge: dw-hdmi: Pass drm_display_info to
> > dw_hdmi_support_scdc()
> > drm: bridge: dw-hdmi: Split connector creation to a separate
> > function
> > drm: bridge: dw-hdmi: Store current connector in struct dw_hdmi
> > drm: bridge: dw-hdmi: Pass drm_connector to internal functions as
> > needed
> > drm: bridge: dw-hdmi: Make connector creation optional
> > drm: bridge: dw-hdmi: Attach to next bridge if available
> > drm: rcar-du: dw-hdmi: Set output port number
> > drm: rcar-du: Fix error handling in rcar_du_encoder_init()
> > drm: rcar-du: Use drm_bridge_connector_init() helper
> > drm: Add default modes for connectors in unknown state
> >
> > drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 159 +++++---
> > .../drm/bridge/analogix/analogix-anx6345.c | 1 +
> > .../drm/bridge/analogix/analogix-anx78xx.c | 1 +
> > drivers/gpu/drm/bridge/cdns-dsi.c | 1 +
> > drivers/gpu/drm/bridge/chrontel-ch7033.c | 1 +
> > drivers/gpu/drm/bridge/nwl-dsi.c | 1 +
> > drivers/gpu/drm/bridge/sii9234.c | 1 +
> > drivers/gpu/drm/bridge/sil-sii8620.c | 1 +
> > drivers/gpu/drm/bridge/simple-bridge.c | 113 +++---
> > drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 357 ++++++++++++
> > ------
> > drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 1 +
> > drivers/gpu/drm/bridge/tc358767.c | 1 +
> > drivers/gpu/drm/bridge/tc358768.c | 1 +
> > drivers/gpu/drm/bridge/thc63lvd1024.c | 1 +
> > drivers/gpu/drm/bridge/ti-tfp410.c | 11 +-
> > drivers/gpu/drm/drm_atomic_helper.c | 3 +-
> > drivers/gpu/drm/drm_bridge.c | 10 +-
> > drivers/gpu/drm/drm_edid.c | 12 +-
> > drivers/gpu/drm/drm_probe_helper.c | 7 +-
> > drivers/gpu/drm/i2c/tda998x_drv.c | 1 +
> > drivers/gpu/drm/imx/dw_hdmi-imx.c | 6 +-
> > drivers/gpu/drm/meson/meson_dw_hdmi.c | 34 +-
> > drivers/gpu/drm/omapdrm/dss/dpi.c | 1 +
> > drivers/gpu/drm/omapdrm/dss/sdi.c | 1 +
> > drivers/gpu/drm/omapdrm/dss/venc.c | 1 +
> > drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 26 +-
> > drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c | 7 +-
> > drivers/gpu/drm/rcar-du/rcar_lvds.c | 124 +-----
> > drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 6 +-
> > drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 6 +-
> > drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | 3 +-
> > drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 3 +-
> > include/drm/bridge/dw_hdmi.h | 28 +-
> > include/drm/drm_bridge.h | 3 +
> > include/drm/drm_edid.h | 6 +-
> > include/drm/drm_modeset_helper_vtables.h | 8 +-
> > 36 files changed, 541 insertions(+), 406 deletions(-)
> >
> > --
> > Regards,
> >
> > Laurent Pinchart
> >
> > _______________________________________________
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>
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