Unverified Commit 8ce4129e authored by Marek Vasut's avatar Marek Vasut Committed by Robert Foss
Browse files

drm/bridge: lt9211: Add Lontium LT9211 bridge driver 



Add driver for Lontium LT9211 Single/Dual-Link DSI/LVDS or Single DPI to
Single-link/Dual-Link DSI/LVDS or Single DPI bridge. This chip is highly
capable at converting formats, but sadly it is also highly undocumented.

This driver is written without any documentation from Lontium and based
only on shreds of information available in various obscure example codes,
hence long runs of unknown register patches and lengthy delays in various
places. Whichever register meaning could be divined from its behavior has
at least a comment around it.

Currently the only mode tested is Single-link DSI to Single-link LVDS.
Dual-link LVDS might work as well, the register programming is in place,
but is untested.

Reviewed-by: default avatarRobert Foss <robert.foss@linaro.org>
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
To: dri-devel@lists.freedesktop.org
Signed-off-by: default avatarRobert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220419143958.94873-2-marex@denx.de
parent 501f94d0

drivers/gpu/drm/bridge/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -100,6 +100,19 @@ config DRM_LONTIUM_LT8912B 
	  Say M here if you want to support this hardware as a module.

	  The module will be named "lontium-lt8912b".



config DRM_LONTIUM_LT9211

	tristate "Lontium LT9211 DSI/LVDS/DPI bridge"

	depends on OF

	select DRM_PANEL_BRIDGE

	select DRM_KMS_HELPER

	select DRM_MIPI_DSI

	select REGMAP_I2C

	help

	  Driver for Lontium LT9211 Single/Dual-Link DSI/LVDS or Single DPI

	  input to Single-link/Dual-Link DSI/LVDS or Single DPI output bridge

	  chip.

	  Please say Y if you have such hardware.



config DRM_LONTIUM_LT9611

	tristate "Lontium LT9611 DSI/HDMI bridge"

	select SND_SOC_HDMI_CODEC if SND_SOC

drivers/gpu/drm/bridge/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_CROS_EC_ANX7688) += cros-ec-anx7688.o 
obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o

obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o

obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o

obj-$(CONFIG_DRM_LONTIUM_LT9211) += lontium-lt9211.o

obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o

obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o

obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o

drivers/gpu/drm/bridge/lontium-lt9211.c

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