Hi,
This serie is about adding support for the RGB to VGA bridge found in the A13-Olinuxino and the CHIP VGA adapter.
Both these boards rely on an entirely passive bridge made out of resitor ladders that do not require any initialisation. The only thing needed is to get the timings from the screen if available (and if not, fall back on XGA standards), set up the display pipeline to output on the RGB bus with the proper timings, and you're done.
This serie also fixes a bunch of bugs uncovered when trying to increase the resolution, and hence the pixel clock, of our pipeline. It also fixes a few bugs in the DRM driver itself that went unnoticed before.
Let me know what you think, Maxime
Maxime Ripard (20): clk: fixed-factor: Pass clk rates change to the parent clk: multiplier: Prevent the multiplier from under / over flowing clk: sunxi: tcon-ch1: Do not return a negative error in get_parent clk: sunxi: display: Add per-clock flags drm/sun4i: request exact rates to our parents drm/sun4i: allow dclk to modify its parent rate drm/sun4i: rgb: Validate the clock rate drm/sun4i: rgb: panel is an error pointer drm/sun4i: defer only if we didn't find our panel drm/sun4i: remove simplefb at probe drm/sun4i: Convert to connector register helpers drm/sun4i: Add bridge support drm/bridge: Add RGB to VGA bridge support ARM: sun5i: a13: Add LCD pins ARM: sun5i: Move display blocks to A13 ARM: sun5i: a13-olinuxino: Enable VGA bridge ARM: multi_v7: Enable sun4i DRM driver ARM: multi_v7: enable VGA bridge ARM: sunxi: Enable sun4i DRM driver ARM: sunxi: Enable VGA bridge
.../bindings/display/bridge/dumb-vga.txt | 40 +++++ arch/arm/boot/dts/sun5i-a13-olinuxino.dts | 34 ++++ arch/arm/boot/dts/sun5i-a13.dtsi | 122 ++++++++++++++ arch/arm/boot/dts/sun5i-r8.dtsi | 120 +------------ arch/arm/configs/multi_v7_defconfig | 2 + arch/arm/configs/sunxi_defconfig | 3 + drivers/clk/clk-fixed-factor.c | 3 +- drivers/clk/clk-multiplier.c | 20 ++- drivers/clk/sunxi/clk-sun4i-display.c | 5 +- drivers/clk/sunxi/clk-sun4i-tcon-ch1.c | 3 - drivers/gpu/drm/bridge/Kconfig | 6 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/dumb-vga.c | 186 +++++++++++++++++++++ drivers/gpu/drm/sun4i/sun4i_dotclock.c | 31 +++- drivers/gpu/drm/sun4i/sun4i_drv.c | 54 +++--- drivers/gpu/drm/sun4i/sun4i_rgb.c | 70 ++++++-- drivers/gpu/drm/sun4i/sun4i_tcon.c | 59 +++++-- drivers/gpu/drm/sun4i/sun4i_tcon.h | 1 + 18 files changed, 578 insertions(+), 182 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/bridge/dumb-vga.txt create mode 100644 drivers/gpu/drm/bridge/dumb-vga.c