[PATCH v7 0/2] drm: bridge: Add NWL MIPI DSI host controller support
Guido Günther
agx at sigxcpu.org
Sun Nov 17 13:19:05 UTC 2019
Hi,
On Sat, Oct 19, 2019 at 04:12:23PM +0200, Guido Günther wrote:
> This adds initial support for the NWL MIPI DSI Host controller found on i.MX8
> SoCs.
Is there anything i can do to move this forward? As far as i can tell
all review comments should be addressed.
Cheers,
-- Guido
>
> It adds support for the i.MX8MQ but the same IP core can also be found on e.g.
> i.MX8QXP. I added the necessary hooks to support other imx8 variants but since
> I only have imx8mq boards to test I omitted the platform data for other SoCs.
>
> The code is based on NXPs BSP so I added Robert Chiras as
> Co-authored-by.
>
> The most notable changes over the BSP driver are
> - Calculate HS mode timing from phy_configure_opts_mipi_dphy
> - Perform all clock setup via DT
> - Merge nwl-imx and nwl drivers
> - Add B0 silion revision quirk
> - become a bridge driver to hook into mxsfb / dcss
> imx-display-subsystem so it makes sense to make it drive a bridge for dsi as
> well).
> - Use panel_bridge to attach the panel
> - Use multiplex framework instead of accessing syscon directly
>
> This has been tested on a Librem 5 devkit using mxsfb with Robert's patches[1]
> and the rocktech-jh057n00900 panel driver on next-20191018. The DCSS can later
> on also act as input source too.
>
> Changes from v7:
> - Per review comments by Andrzej Hajda
> https://lore.kernel.org/linux-arm-kernel/c86b7ca2-7799-eafd-c380-e4b551520837@samsung.com/
> - Drop spare empty line
> - handle nwl_dsi_write errors
> - better handle read errors
> - unwind in case of error in nwl_dsi_enable
> - use bridge_to_dsi() instead of accessing driver_private
> - don't log on -EPROBEDEFER when fething the reset controller
> - use endpoint number to determine input
> - Spotted by kbuild test robot <lkp at intel.com>
> https://lore.kernel.org/linux-arm-kernel/201909230644.qfSKbNf9%25lkp@intel.com/
> Use signed return type for nwl_dsi_get_dpi_pixel_format
> - Drop connector type from drm_panel_bridge_add
> - Don't forget to set an error value on dsi reads
>
> Changes from v5:
> - Per review comments by Andrzej Hajda
> https://lists.freedesktop.org/archives/dri-devel/2019-September/235281.html
> - Fix include file ordering
> - Add a comment to nwl_dsi_platform_data that will allow to add support
> at least for the i.MX8QM
> - Merge driver into a single file plus the register defs in a separate header
> - Make more functions and structs static
>
> Changes from v4:
> - Collect Reviewed-by: from Rob Herring, thanks!
> https://lists.freedesktop.org/archives/dri-devel/2019-September/233979.html
> - Spotted by kbuild test robot <lkp at intel.com>
> https://lists.freedesktop.org/archives/dri-devel/2019-September/233860.html
> https://lists.freedesktop.org/archives/dri-devel/2019-September/233863.html
> - fix format string for size_t
> - Use DIV64_U64_ROUND_UP to fix build on 32 bit architectures
> We can't use simple shift sind d and n are similar in size and
> we need full precision
> - Fix debug cfg_t_post debug print out
> - Avoid PSEC_PER_SEC
> - Move timeout / overflow handling out of nwl_dsi_finish_transmission,
> it would never end up being reported since the call to the function
> was guarded by flags.
> - Drop 'support for' from KConfig title to make it match the other
> drivers in that submenu
>
> Changes from v3:
> - Per review comments by Robert Chiras
> https://lists.freedesktop.org/archives/dri-devel/2019-August/232580.html
> - Add Robert's {Signed-off,Tested}-by:
> - Respect number of lanes when calculting bandwidth limits
> - Drop duplicate NWL_DSI_ENABLE_MULT_PKTS setup
> - Per testing by Rober Chiras
> https://lists.freedesktop.org/archives/dri-devel/2019-August/233688.html
> - Drop duplicate (and too early) drm_bridge_add() in nwl_dir_probe() that
> made mxsfb fail to connect to the bridge since the panel_bridge was not up
> yet. drm_bridge_add() happens in nwl_dsi_host_attach() where after the
> panel_bridge was set up.
> - Per review comments by Rob Herring on bindings
> https://lists.freedesktop.org/archives/dri-devel/2019-August/233196.html
> - drop description from power-domains and resets
> - allow BSD 2 clause license as well
> - make ports more specific
> - add #address-cells, #size-cells as required
> - use additionalProperties
> - panel is of type object
>
> Changes from v2:
> - Per review comments by Rob Herring
> https://lists.freedesktop.org/archives/dri-devel/2019-August/230448.html
> - bindings:
> - Simplify by restricting to fsl,imx8mq-nwl-dsi
> - document reset lines
> - add port@{0,1}
> - use a real compatible string for the panel
> - resets are required
> - Per review comments by Arnd Bergmann
> https://lists.freedesktop.org/archives/dri-devel/2019-August/230868.html
> - Don't access iomuxc_gpr regs directly. This allows us to drop the
> first patch in the series with the iomuxc_gpr field defines.
> - Per review comments by Laurent Pinchart
> Fix wording in bindings
> - Add mux-controls to bindings
> - Don't print error message on dphy probe deferral
>
> Changes from v1:
> - Per review comments by Sam Ravnborg
> https://lists.freedesktop.org/archives/dri-devel/2019-July/228130.html
> - Change binding docs to YAML
> - build: Don't always visit imx-nwl/
> - build: Add header-test-y
> - Sort headers according to DRM convention
> - Use drm_display_mode instead of videmode
> - Per review comments by Fabio Estevam
> https://lists.freedesktop.org/archives/dri-devel/2019-July/228299.html
> - Don't restrict build to ARCH_MXC
> - Drop unused includes
> - Drop unreachable code in imx_nwl_dsi_bridge_mode_fixup()
> - Drop remaining calls of dev_err() and use DRM_DEV_ERR()
> consistently.
> - Use devm_platform_ioremap_resource()
> - Drop devm_free_irq() in probe() error path
> - Use single line comments where sufficient
> - Use <linux/time64.h> instead of defining USEC_PER_SEC
> - Make input source select imx8 specific
> - Drop <asm/unaligned.h> inclusion (after removal of get_unaligned_le32)
> - Drop all EXPORT_SYMBOL_GPL() for functions used in the same module
> but different source files.
> - Drop nwl_dsi_enable_{rx,tx}_clock() by invoking clk_prepare_enable()
> directly
> - Remove pointless comment
> - Laurent Pinchart
> https://lists.freedesktop.org/archives/dri-devel/2019-July/228313.html
> https://lists.freedesktop.org/archives/dri-devel/2019-July/228308.html
> - Drop (on iMX8MQ) unused csr regmap
> - Use NWL_MAX_PLATFORM_CLOCKS everywhere
> - Drop get_unaligned_le32() usage
> - remove duplicate 'for the' in binding docs
> - Don't include unused <linux/clk-provider.h>
> - Don't include unused <linux/component.h>
> - Drop dpms_mode for tracking state, trust the drm layer on that
> - Use pm_runtime_put() instead of pm_runtime_put_sync()
> - Don't overwrite encoder type
> - Make imx_nwl_platform_data const
> - Use the reset controller API instead of open coding that platform specific
> part
> - Use <linux/bitfield.h> intead of making up our own defines
> - name mipi_dsi_transfer less generic: nwl_dsi_transfer
> - ensure clean in .remove by calling mipi_dsi_host_unregister.
> - prefix constants by NWL_DSI_
> - properly format transfer_direction enum
> - simplify platform clock handling
> - Don't modify state in mode_fixup() and use mode_set() instead
> - Drop bridge detach(), already handle by nwl_dsi_host_detach()
> - Drop USE_*_QUIRK() macros
> - Drop (for now) unused clock defnitions. 'pixel' and 'bypass' clock will be
> used for i.MX8 SoCs but since they're unused atm drop the definitions - but
> keep the logic to enable/disable several clocks in place since we know we'll
> need it in the future.
>
> Changes from v0:
> - Add quirk for IMQ8MQ silicon B0 revision to not mess with the
> system reset controller on power down since enable() won't work
> otherwise.
> - Drop devm_free_irq() handled by the device driver core
> - Disable tx esc clock after the phy power down to unbreak
> disable/enable (unblank/blank)
> - Add ports to dt binding docs
> - Select GENERIC_PHY_MIPI_DPHY instead of GENERIC_PHY for
> phy_mipi_dphy_get_default_config
> - Select DRM_MIPI_DSI
> - Include drm_print.h to fix build on next-20190408
> - Drop some debugging messages
> - Newline terminate all DRM_ printouts
> - Turn component driver into a drm bridge
>
> [0]: https://lists.freedesktop.org/archives/dri-devel/2019-May/219484.html
> [1]: https://patchwork.freedesktop.org/series/62822/
>
> Guido Günther (2):
> dt-bindings: display/bridge: Add binding for NWL mipi dsi host
> controller
> drm/bridge: Add NWL MIPI DSI host controller support
>
> .../bindings/display/bridge/nwl-dsi.yaml | 203 +++
> drivers/gpu/drm/bridge/Kconfig | 16 +
> drivers/gpu/drm/bridge/Makefile | 3 +
> drivers/gpu/drm/bridge/nwl-dsi.c | 1235 +++++++++++++++++
> drivers/gpu/drm/bridge/nwl-dsi.h | 144 ++
> 5 files changed, 1601 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml
> create mode 100644 drivers/gpu/drm/bridge/nwl-dsi.c
> create mode 100644 drivers/gpu/drm/bridge/nwl-dsi.h
>
> --
> 2.23.0.rc1
>
>
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