Re: [PATCH v10 2/2] drm/bridge: Add Lontium LT9611C(EX/UXD) MIPI DSI to HDMI driver

[Mohit Dsor]

On Wed, Aug 19, 2026 at 12:49:53AM +0300, Dmitry Baryshkov wrote:
> On Sat, Aug 08, 2026 at 01:37:51PM +0530, mohit.dsor@xxxxxxxxxxxxxxxx wrote:
> > From: Sunyun Yang <syyang@xxxxxxxxxxx>
> > 
> > LT9611C(EX/UXD) is an I2C-controlled chip that Receiver signal/dual port
> > mipi dsi and output hdmi, differences in hardware features:
> > - LT9611C: supports 1-port mipi dsi to hdmi 1.4
> > - LT9611EX: supports 2-port mipi dsi to hdmi 1.4
> > - LT9611UXD: supports 2-port mipi dsi to hdmi 1.4/2.0
> > 
> > Signed-off-by: Sunyun Yang <syyang@xxxxxxxxxxx>
> > Co-developed-by: Mohit Dsor <mohit.dsor@xxxxxxxxxxxxxxxx>
> > Signed-off-by: Mohit Dsor <mohit.dsor@xxxxxxxxxxxxxxxx>
> > ---
> >  Documentation/ABI/testing/sysfs-lontium-firmware |   10 +
> >  drivers/gpu/drm/bridge/Kconfig                   |   18 +
> >  drivers/gpu/drm/bridge/Makefile                  |    1 +
> >  drivers/gpu/drm/bridge/lontium-lt9611c.c         | 1283 ++++++++++++++++++++++
> >  4 files changed, 1312 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-lontium-firmware b/Documentation/ABI/testing/sysfs-lontium-firmware
> > new file mode 100644
> > index 000000000000..8700933ba0f0
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/sysfs-lontium-firmware
> > @@ -0,0 +1,10 @@
> > +What:		/sys/bus/i2c/drivers/<driver>/.../firmware
> > +Date:		July 2026
> > +KernelVersion:	7.3
> > +Contact:	Mohit Dsor <mohit.dsor@xxxxxxxxxxxxxxxx>
> > +Description:
> > +		Read: Returns the current firmware version loaded on the
> > +		Lontium bridge chip in hex format (e.g. "0x0105").
> > +
> > +		Write: Triggers a firmware upgrade of the chip using the
> > +		firmware file loaded via the firmware loader.
> > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > index 4a57d49b4c6d..d1597548e578 100644
> > --- a/drivers/gpu/drm/bridge/Kconfig
> > +++ b/drivers/gpu/drm/bridge/Kconfig
> > @@ -177,6 +177,24 @@ config DRM_LONTIUM_LT9611
> >  	  HDMI signals
> >  	  Please say Y if you have such hardware.
> >  
> > +config DRM_LONTIUM_LT9611C
> > +	tristate "Lontium LT9611C DSI/HDMI bridge"
> > +	select SND_SOC_HDMI_CODEC if SND_SOC
> > +	depends on OF && I2C
> > +	select CRC8
> > +	select FW_LOADER
> > +	select DRM_PANEL_BRIDGE
> > +	select DRM_KMS_HELPER
> > +	select DRM_MIPI_DSI
> > +	select DRM_DISPLAY_HELPER
> > +	select DRM_DISPLAY_HDMI_STATE_HELPER
> > +	select REGMAP_I2C
> > +	help
> > +	  Driver for the Lontium LT9611C(EX/UXD) DSI to HDMI bridge chip.
> > +	  It converts single or dual MIPI DSI and I2S signals to HDMI
> > +	  output. Supports HDMI 1.4 (LT9611C/EX) and HDMI 2.0 (LT9611UXD).
> > +	  Say Y if you have hardware using this chip.
> > +
> >  config DRM_LONTIUM_LT9611UXC
> >  	tristate "Lontium LT9611UXC DSI/HDMI bridge"
> >  	select SND_SOC_HDMI_CODEC if SND_SOC
> > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > index 15cc821d85b7..f322f3f89f6b 100644
> > --- a/drivers/gpu/drm/bridge/Makefile
> > +++ b/drivers/gpu/drm/bridge/Makefile
> > @@ -16,6 +16,7 @@ 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-$(CONFIG_DRM_LONTIUM_LT9611C) += lontium-lt9611c.o
> >  obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
> >  obj-$(CONFIG_DRM_LONTIUM_LT8713SX) += lontium-lt8713sx.o
> >  obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
> > diff --git a/drivers/gpu/drm/bridge/lontium-lt9611c.c b/drivers/gpu/drm/bridge/lontium-lt9611c.c
> > new file mode 100644
> > index 000000000000..e6887f2c89a6
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/lontium-lt9611c.c
> > @@ -0,0 +1,1283 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2026 Lontium Semiconductor, Inc.
> > + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> > + */
> > +
> > +#include <linux/crc8.h>
> > +#include <linux/firmware.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/media-bus-format.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/unaligned.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_bridge.h>
> > +#include <drm/drm_connector.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_edid.h>
> > +#include <drm/drm_mipi_dsi.h>
> > +#include <drm/drm_modes.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_print.h>
> > +#include <drm/drm_probe_helper.h>
> > +#include <drm/display/drm_hdmi_audio_helper.h>
> > +#include <drm/display/drm_hdmi_state_helper.h>
> > +#include <sound/hdmi-codec.h>
> > +
> > +#define FW_SIZE (64 * 1024)
> > +#define LT_PAGE_SIZE 256
> > +#define FW_FILE  "lt9611c_fw.bin"
> 
> Lontium/lt9611c_fw.bin
> 
> With that fixed:
> 
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
Thanks Dmitry, will fix it and add R/B tag.
> 
> 
> 
> -- 
> With best wishes
> Dmitry