Re: [PATCH v2 6/6] drm/meson: add support for MIPI-DSI transceiver

The Amlogic G12A/G12B/SM1 SoCs embeds a Synopsys DW-MIPI-DSI transceiver (ver 1.21a),
with a custom glue managing the IP resets, clock and data input similar to the DW-HDMI
Glue on other Amlogic SoCs.

This adds support for the Glue managing the transceiver, mimicing the init flow provided
by Amlogic to setup the ENCL encoder, the glue, the transceiver, the digital D-PHY and the
Analog PHY in the proper way.

An optional "MEAS" clock can be enabled to measure the delay between each vsync feeding the
DW-MIPI-DSI transceiver.

Signed-off-by: Neil Armstrong <redacted>
---
 drivers/gpu/drm/meson/Kconfig             |   7 +
 drivers/gpu/drm/meson/Makefile            |   1 +
 drivers/gpu/drm/meson/meson_dw_mipi_dsi.c | 357 ++++++++++++++++++++++
 drivers/gpu/drm/meson/meson_dw_mipi_dsi.h | 160 ++++++++++
 4 files changed, 525 insertions(+)
 create mode 100644 drivers/gpu/drm/meson/meson_dw_mipi_dsi.c
 create mode 100644 drivers/gpu/drm/meson/meson_dw_mipi_dsi.h

diff --git a/drivers/gpu/drm/meson/Kconfig b/drivers/gpu/drm/meson/Kconfig
index 6c70fc3214af..71a1364b51e1 100644
--- a/drivers/gpu/drm/meson/Kconfig
+++ b/drivers/gpu/drm/meson/Kconfig

@@ -17,3 +17,10 @@ config DRM_MESON_DW_HDMI
        default y if DRM_MESON
        select DRM_DW_HDMI
        imply DRM_DW_HDMI_I2S_AUDIO
+
+config DRM_MESON_DW_MIPI_DSI
+       tristate "MIPI DSI Synopsys Controller support for Amlogic Meson Display"
+       depends on DRM_MESON
+       default y if DRM_MESON
+       select DRM_DW_MIPI_DSI
+       select GENERIC_PHY_MIPI_DPHY

diff --git a/drivers/gpu/drm/meson/Makefile b/drivers/gpu/drm/meson/Makefile
index 833e18c20603..43071bdbd4b9 100644
--- a/drivers/gpu/drm/meson/Makefile
+++ b/drivers/gpu/drm/meson/Makefile

@@ -6,3 +6,4 @@ meson-drm-y += meson_encoder_hdmi.o meson_encoder_dsi.o

 obj-$(CONFIG_DRM_MESON) += meson-drm.o
 obj-$(CONFIG_DRM_MESON_DW_HDMI) += meson_dw_hdmi.o
+obj-$(CONFIG_DRM_MESON_DW_MIPI_DSI) += meson_dw_mipi_dsi.o