[PATCH v2 00/50] drm/omap: Replace custom display drivers with drm_bridge and drm_panel
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Tue Aug 20 01:16:31 UTC 2019
Hello,
This patch series (nearly, see [1]) completes the rework of the omapdrm
driver to move to drm_bridge and drm_panel.
Let's start with some context (copied from v1) to understand the
problem. omapdrm contains custom drivers for external encoders, panels
and connectors (collectively referred to as display drivers). It
combines them to create output pipelines abstracted by a drm_encoder and
a drm_connector, with the ability to delegate the encoder and connector
operations to the component in the pipeline that implements them. For
instance, for an HDMI output pipeline, the hot plug detection and the
EDID read can be implemented by two different components, when they are
handled by two different devices at the hardware level.
DRM/KMS uses drm_bridge and drm_panel to abstract external encoders and
panels. The model is however simpler than what omapdrm provides, as
bridges were designed to be simple add-ons at the output of a
drm_encoder. The ability to chain bridges exists, but a bridge driver
hardcodes in its design its position in the pipeline : bridges that
expect to terminate the pipeline create a drm_connector, while bridges
that expect to be an intermediate component in the pipeline do not
create a connector. In addition to not supporting bridges that can be
either internal or a termination point in the pipeline depending on the
hardware design, implementing the drm_connector inside a bridge driver
makes it impossible to support hardware where bridge operations are
handled by different hardware components, as explained above.
The omapdrm driver has received support for drm_bridge and drm_panel,
but these issues prevented completely moving away from the omapdrm
custom display drivers. This patch series thus first reworks the
drm_bridge infrastructure to support the omapdrm use cases, and then
transitions the omapdrm driver.
The series starts with a small drive-by cleanup (01/50), followed by a
new helper (02/50) that leverages data from drm_connector.c to convert a
connector type to a string. Patch 03/50 then adds a new flag to the
drm_display_info structure to identify HDMI sinks. This is a feature
needed by the OMAP4 and OMAP5 HDMI encoders, and I believe it can be
useful to other HDMI encoders as well.
The next two patches address the drm_bridge issues explained above.
Patch 04/50 adds connector-related operations to drm_bridge, and patch
05/50 makes it possible to attach to a bridge without having the bridge
create a connector. The connector is expected to be created by the
display controller driver.
The approach taken here is slightly intrusive as path 05/50 adds a
parameter to the bridge .attach() operation, and thus touches all bridge
drivers, even if the changes are very simple (as a consequence I haven't
CC'ed all the individual bridge maintainers as the CC list was too
large). Other options may be possible, what matters most to me is the
feature, not so much its implementation. Please note that compared to v1
this version uses a flag bitmask instead of a boolean on Andrzej's
request, as he expects the parameter to be useful for other purposes.
The first sizeable change follows with the rename of the dumb-vga-dac
driver to simple-bridge (06/50 and 07/50) and support for non-VGA
bridges (08/50). This doesn't change the spirit of the driver that still
focusses on transparent bridges, but prepares it to support an analog
video amplifier. Patches 09/50 then add support for an enable GPIO, and
10/50 support for the OPA362 video amplifier itself.
The next six patches make use of these new features: patches 11/50 and
12/50 add new bridge drivers for display connectors and for the TI
TPD12S015 HDMI level shifter respectively, patch 13/50 supports the new
API in the panel bridge driver, and patches 15/50 to 16/50 do the same
in the ti-tfp410 driver.
Patch 17/50 is possibly the most remarkable one in the series, with the
drm_bridge operations extension, as it provides a helper for display
controller drivers to construct a drm_connector entirerly backed by a
chain of bridges. This offsets the complexity of the additional bridge
operations by handling it all in a single place. An example usage for
omapdrm can be found in patch 34/50. Don't let its diffstat mislead you,
usage of the helper would remove lots of code if it wasn't for the fact
that the legacy implementation still has to be kept for the DSI panel
(see [1]). Down the road this helper and the new operation paradigm
should remove code from both display controller and bridge drivers.
The rest of the series is omapdrm-focussed, slowly preparing the driver
for the switch to drm_bridge drivers using the new helper (34/50), the
removal of the omapdrm-specific display drivers (35/50), and lots of
simplification and code removal in the other patches.
Compared to v1, many review comments have been taken into account, please
see individual patches for details. Please note that some issues are
still being discussed and have thus not been addressed yet. This
includes HPD handling and removal of the drm_connector argument from the
drm_bridge .get_edid() operation.
The patches can be found at
git://linuxtv.org/pinchartl/media.git omapdrm/bridge/devel
[1] The only notable exception is the omapdrm-specific DSI panel driver
that implements a large number of custom operations. This should be
addressed separately.
Laurent Pinchart (50):
video: hdmi: Change return type of hdmi_avi_infoframe_init() to void
drm/connector: Add helper to get a connector type name
drm/edid: Add flag to drm_display_info to identify HDMI sinks
drm/bridge: Add connector-related bridge operations and data
drm/bridge: Extend bridge API to disable connector creation
drm/bridge: dumb-vga-dac: Rename internal symbols to simple-bridge
drm/bridge: dumb-vga-dac: Rename driver to simple-bridge
drm/bridge: simple-bridge: Add support for non-VGA bridges
drm/bridge: simple-bridge: Add support for enable GPIO
drm/bridge: simple-bridge: Add support for the TI OP362
drm/bridge: Add bridge driver for display connectors
drm/bridge: Add driver for the TI TPD12S015 HDMI level shifter
drm/bridge: panel: Implement bridge connector operations
drm/bridge: tfp410: Don't include drmP.h
drm/bridge: tfp410: Replace manual connector handling with bridge
drm/bridge: tfp410: Allow operation without drm_connector
drm: Add helper to create a connector for a chain of bridges
drm/omap: Simplify HDMI mode and infoframe configuration
drm/omap: Factor out display type to connector type conversion
drm/omap: Use the drm_panel_bridge API
drm/omap: dss: Fix output next device lookup in DT
drm/omap: Add infrastructure to support drm_bridge local to DSS
outputs
drm/omap: dss: Make omap_dss_device_ops optional
drm/omap: hdmi: Allocate EDID in the .read_edid() operation
drm/omap: hdmi4: Rework EDID read to isolate data read
drm/omap: hdmi5: Rework EDID read to isolate data read
drm/omap: hdmi4: Register a drm_bridge for EDID read
drm/omap: hdmi5: Register a drm_bridge for EDID read
drm/omap: hdmi4: Move mode set, enable and disable operations to
bridge
drm/omap: hdmi5: Move mode set, enable and disable operations to
bridge
drm/omap: hdmi4: Implement drm_bridge .hpd_notify() operation
drm/omap: dss: Remove .set_hdmi_mode() and .set_infoframe() operations
drm/omap: venc: Register a drm_bridge
drm/omap: Create connector for bridges
drm/omap: Switch the HDMI and VENC outputs to drm_bridge
drm/omap: Remove HPD, detect and EDID omapdss operations
drm/omap: hdmi: Remove omap_dss_device operations
drm/omap: venc: Remove omap_dss_device operations
drm/omap: hdmi4: Simplify EDID read
drm/omap: hdmi5: Simplify EDID read
drm/omap: dpi: Sort includes alphabetically
drm/omap: dpi: Reorder functions in sections
drm/omap: dpi: Simplify clock setting API
drm/omap: dpi: Register a drm_bridge
drm/omap: sdi: Sort includes alphabetically
drm/omap: sdi: Register a drm_bridge
drm/omap: Simplify connector implementation
drm/omap: dss: Remove unused omap_dss_device operations
drm/omap: dss: Inline the omapdss_display_get() function
drm/omap: dss: Remove unused omapdss_of_find_connected_device()
function
Documentation/gpu/todo.rst | 12 +
arch/arm/configs/davinci_all_defconfig | 2 +-
arch/arm/configs/integrator_defconfig | 2 +-
arch/arm/configs/multi_v7_defconfig | 2 +-
arch/arm/configs/shmobile_defconfig | 2 +-
arch/arm/configs/sunxi_defconfig | 2 +-
arch/arm/configs/versatile_defconfig | 2 +-
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/arc/arcpgu_hdmi.c | 2 +-
.../gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 2 +-
drivers/gpu/drm/bridge/Kconfig | 29 +-
drivers/gpu/drm/bridge/Makefile | 4 +-
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 6 +-
drivers/gpu/drm/bridge/analogix-anx78xx.c | 6 +-
.../drm/bridge/analogix/analogix_dp_core.c | 8 +-
drivers/gpu/drm/bridge/cdns-dsi.c | 6 +-
drivers/gpu/drm/bridge/display-connector.c | 292 ++++++++++++++
drivers/gpu/drm/bridge/dumb-vga-dac.c | 299 --------------
drivers/gpu/drm/bridge/lvds-encoder.c | 5 +-
.../bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 6 +-
drivers/gpu/drm/bridge/nxp-ptn3460.c | 6 +-
drivers/gpu/drm/bridge/panel.c | 22 +-
drivers/gpu/drm/bridge/parade-ps8622.c | 6 +-
drivers/gpu/drm/bridge/sii902x.c | 6 +-
drivers/gpu/drm/bridge/sil-sii8620.c | 3 +-
drivers/gpu/drm/bridge/simple-bridge.c | 339 ++++++++++++++++
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 +-
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 8 +-
drivers/gpu/drm/bridge/tc358764.c | 6 +-
drivers/gpu/drm/bridge/tc358767.c | 6 +-
drivers/gpu/drm/bridge/thc63lvd1024.c | 5 +-
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 +-
drivers/gpu/drm/bridge/ti-tfp410.c | 205 ++++------
drivers/gpu/drm/bridge/ti-tpd12s015.c | 195 +++++++++
drivers/gpu/drm/drm_bridge.c | 100 ++++-
drivers/gpu/drm/drm_bridge_connector.c | 372 ++++++++++++++++++
drivers/gpu/drm/drm_connector.c | 15 +
drivers/gpu/drm/drm_edid.c | 11 +-
drivers/gpu/drm/drm_simple_kms_helper.c | 2 +-
drivers/gpu/drm/exynos/exynos_dp.c | 3 +-
drivers/gpu/drm/exynos/exynos_drm_dsi.c | 4 +-
drivers/gpu/drm/exynos/exynos_hdmi.c | 2 +-
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c | 2 +-
drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c | 2 +-
drivers/gpu/drm/i2c/tda998x_drv.c | 8 +-
drivers/gpu/drm/imx/imx-ldb.c | 2 +-
drivers/gpu/drm/imx/parallel-display.c | 2 +-
drivers/gpu/drm/ingenic/ingenic-drm.c | 2 +-
drivers/gpu/drm/mcde/mcde_dsi.c | 8 +-
drivers/gpu/drm/mediatek/mtk_dpi.c | 2 +-
drivers/gpu/drm/mediatek/mtk_dsi.c | 2 +-
drivers/gpu/drm/mediatek/mtk_hdmi.c | 8 +-
drivers/gpu/drm/msm/dsi/dsi_manager.c | 4 +-
drivers/gpu/drm/msm/edp/edp_bridge.c | 2 +-
drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 2 +-
drivers/gpu/drm/omapdrm/displays/Kconfig | 22 --
drivers/gpu/drm/omapdrm/displays/Makefile | 4 -
.../omapdrm/displays/connector-analog-tv.c | 97 -----
.../gpu/drm/omapdrm/displays/connector-hdmi.c | 183 ---------
.../gpu/drm/omapdrm/displays/encoder-opa362.c | 137 -------
.../drm/omapdrm/displays/encoder-tpd12s015.c | 217 ----------
.../gpu/drm/omapdrm/displays/panel-dsi-cm.c | 2 +-
drivers/gpu/drm/omapdrm/dss/Makefile | 2 +-
drivers/gpu/drm/omapdrm/dss/base.c | 71 ++--
drivers/gpu/drm/omapdrm/dss/display.c | 9 -
drivers/gpu/drm/omapdrm/dss/dpi.c | 337 +++++++++-------
drivers/gpu/drm/omapdrm/dss/dsi.c | 4 +-
drivers/gpu/drm/omapdrm/dss/dss-of.c | 28 --
drivers/gpu/drm/omapdrm/dss/dss.c | 3 +-
drivers/gpu/drm/omapdrm/dss/hdmi.h | 4 +-
drivers/gpu/drm/omapdrm/dss/hdmi4.c | 324 ++++++++-------
drivers/gpu/drm/omapdrm/dss/hdmi4_core.c | 59 +--
drivers/gpu/drm/omapdrm/dss/hdmi4_core.h | 4 +-
drivers/gpu/drm/omapdrm/dss/hdmi5.c | 304 +++++++-------
drivers/gpu/drm/omapdrm/dss/hdmi5_core.c | 48 +--
drivers/gpu/drm/omapdrm/dss/hdmi5_core.h | 5 +-
.../gpu/drm/omapdrm/dss/omapdss-boot-init.c | 5 -
drivers/gpu/drm/omapdrm/dss/omapdss.h | 47 +--
drivers/gpu/drm/omapdrm/dss/output.c | 55 ++-
drivers/gpu/drm/omapdrm/dss/sdi.c | 188 +++++----
drivers/gpu/drm/omapdrm/dss/venc.c | 270 +++++++------
drivers/gpu/drm/omapdrm/omap_connector.c | 246 +-----------
drivers/gpu/drm/omapdrm/omap_connector.h | 3 -
drivers/gpu/drm/omapdrm/omap_drv.c | 96 +++--
drivers/gpu/drm/omapdrm/omap_encoder.c | 83 +---
drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 2 +-
drivers/gpu/drm/rcar-du/rcar_lvds.c | 8 +-
drivers/gpu/drm/rockchip/rockchip_lvds.c | 2 +-
drivers/gpu/drm/rockchip/rockchip_rgb.c | 2 +-
drivers/gpu/drm/sti/sti_dvo.c | 2 +-
drivers/gpu/drm/sti/sti_hda.c | 2 +-
drivers/gpu/drm/sti/sti_hdmi.c | 2 +-
drivers/gpu/drm/stm/ltdc.c | 2 +-
drivers/gpu/drm/sun4i/sun4i_lvds.c | 2 +-
drivers/gpu/drm/sun4i/sun4i_rgb.c | 2 +-
drivers/gpu/drm/tilcdc/tilcdc_external.c | 2 +-
drivers/gpu/drm/vc4/vc4_dpi.c | 2 +-
drivers/gpu/drm/vc4/vc4_dsi.c | 2 +-
drivers/video/hdmi.c | 11 +-
include/drm/drm_bridge.h | 197 +++++++++-
include/drm/drm_bridge_connector.h | 18 +
include/drm/drm_connector.h | 9 +
include/linux/hdmi.h | 2 +-
103 files changed, 2819 insertions(+), 2375 deletions(-)
create mode 100644 drivers/gpu/drm/bridge/display-connector.c
delete mode 100644 drivers/gpu/drm/bridge/dumb-vga-dac.c
create mode 100644 drivers/gpu/drm/bridge/simple-bridge.c
create mode 100644 drivers/gpu/drm/bridge/ti-tpd12s015.c
create mode 100644 drivers/gpu/drm/drm_bridge_connector.c
delete mode 100644 drivers/gpu/drm/omapdrm/displays/connector-analog-tv.c
delete mode 100644 drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
delete mode 100644 drivers/gpu/drm/omapdrm/displays/encoder-opa362.c
delete mode 100644 drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
delete mode 100644 drivers/gpu/drm/omapdrm/dss/dss-of.c
create mode 100644 include/drm/drm_bridge_connector.h
--
Regards,
Laurent Pinchart
More information about the dri-devel
mailing list