After 9 months of development, I finally got the DSI panel to light up from poweron, and this is the series for enabling it. I've included the whole thing Cced to all the subsystems, as there are some interesting choices we have to make (how the analog PHY clocks are represented in common clocks¸ and how the touchscreen panel is represented in DT).
There's one commit left out of the series, which is the fix to allow bcm2835_dma.c's poll-for-completion from IRQ handlers for the DSI1 register write workaround. However, with the panel's DSI transaction workaround, we're not triggering our IRQ handler anyway.
Note that patch #11 is not intended to be pushed, it's just a demo.
Eric Anholt (11): clk: bcm2835: Don't rate change PLLs on behalf of DSI PLL dividers. clk: bcm2835: Register the DSI0/DSI1 pixel clocks. clk: bcm2835: Add leaf clock measurement support, disabled by default drm/vc4: Set up SCALER_DISPCTRL at boot. drm/vc4: Add support for feeding DSI encoders from the pixel valve. dt-bindings: Document the VC4 DSI module nodes. drm/vc4: Add DSI driver dt-bindings: Document the Raspberry Pi Touchscreen nodes. drm/panel: Add support for the Raspberry Pi 7" Touchscreen. ARM: bcm2835: dt: Add the DSI module nodes and clocks. ARM: bcm2835: Enable the Raspberry Pi touchscreen panel.
.../bindings/clock/brcm,bcm2835-cprman.txt | 15 +- .../devicetree/bindings/display/brcm,bcm-vc4.txt | 35 + .../display/panel/raspberrypi,touchscreen.txt | 45 + arch/arm/boot/dts/bcm2835-rpi.dtsi | 8 + arch/arm/boot/dts/bcm283x.dtsi | 77 +- drivers/clk/bcm/clk-bcm2835.c | 302 +++- drivers/gpu/drm/panel/Kconfig | 8 + drivers/gpu/drm/panel/Makefile | 1 + .../gpu/drm/panel/panel-raspberrypi-touchscreen.c | 509 ++++++ drivers/gpu/drm/vc4/Kconfig | 2 + drivers/gpu/drm/vc4/Makefile | 1 + drivers/gpu/drm/vc4/vc4_crtc.c | 33 +- drivers/gpu/drm/vc4/vc4_debugfs.c | 1 + drivers/gpu/drm/vc4/vc4_drv.c | 1 + drivers/gpu/drm/vc4/vc4_drv.h | 5 + drivers/gpu/drm/vc4/vc4_dsi.c | 1725 ++++++++++++++++++++ drivers/gpu/drm/vc4/vc4_hvs.c | 14 + drivers/gpu/drm/vc4/vc4_regs.h | 5 + include/dt-bindings/clock/bcm2835.h | 2 + 19 files changed, 2722 insertions(+), 67 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/panel/raspberrypi,touchscreen.txt create mode 100644 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c create mode 100644 drivers/gpu/drm/vc4/vc4_dsi.c