Hi,
On 2023/10/30 06:53, Dmitry Baryshkov wrote:
On Sun, 29 Oct 2023 at 21:46, Sui Jingfeng <suijingfeng@xxxxxxxxxxx> wrote:
The IT66121 is a DVO to HDMI converter, LS3A5000+LS7A1000 ML5A_MB use this
chip to support HDMI output. Thus add a drm bridge based driver for it.
This patch is developed with drivers/gpu/drm/bridge/ite-it66121.c as base.
Please use the original bridge driver instead of adding a new one.
I'm agree with the spirit of code sharing, but this is nearly impossible for non-DT system.
Because the original bridge driver(say it66121.ko) is fully dependent on the DT.
UEFI+ACPI based system can not use with it.
Our I2C adapter is created by the drm/loongson.ko on the runtime.
The potential problem is that *cyclic dependency* !
I2C adapter driver is depend on drm/loongson
drm/loongson depend on drm bridge driver (say it66121.ko)
drm bridge driver (say it66121.ko) depend on I2C adapter to setup.
This plus the defer probe mechanism is totally a trap,
incurring troubles and don't work.
If
it needs to be changed in any way, please help everyone else by
improving it instead of introducing new driver.
Signed-off-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
---
drivers/gpu/drm/loongson/Kconfig | 1 +
drivers/gpu/drm/loongson/Makefile | 2 +
drivers/gpu/drm/loongson/ite_it66121.c | 749 ++++++++++++++++++++
drivers/gpu/drm/loongson/ite_it66121.h | 19 +
drivers/gpu/drm/loongson/ite_it66121_regs.h | 268 +++++++
5 files changed, 1039 insertions(+)
create mode 100644 drivers/gpu/drm/loongson/ite_it66121.c
create mode 100644 drivers/gpu/drm/loongson/ite_it66121.h
create mode 100644 drivers/gpu/drm/loongson/ite_it66121_regs.h
