Linus Walleij <linus.wall...@linaro.org> writes: > The ARM reference designs "Versatile AB" and "Versatile PB" > contain panel connectors with autodetection of the connected > panel type. This adds a small driver utilizing the MFD syscon > look-up to read the autodetection register and set up the > corresponding panel appropriately. > > In the source file there is a bit of elaboration of the > panel types and interfaces on these boards. > > This was tested with the PL111 DRM driver on the ARM Versatile > AB with the IB2 daughterboard. > > Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
> diff --git a/drivers/gpu/drm/panel/panel-arm-versatile.c
> b/drivers/gpu/drm/panel/panel-arm-versatile.c
> new file mode 100644
> index 000000000000..ce778ca20f3f
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-arm-versatile.c
> @@ -0,0 +1,353 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Panel driver for the ARM Versatile family reference designs from
> + * ARM Limited.
> + *
> + * Author:
> + * Linus Walleij <linus.wal...@linaro.org>
> + *
> + * On the Versatile AB, these panels come mounted on daughterboards
> + * named "IB1" or "IB2" (Interface Board 1 & 2 respectively.) They
> + * are documented in ARM DUI 0225D Appendix C and D. These daughter
> + * boards support TFT display panels.
> + *
> + * - The IB1 is a passive board where the display connector defines a
> + * few wires for encoding the display type for autodetection,
> + * suitable display settings can then be looked up from this setting.
> + * The magic bits can be read out from the system controller.
> + *
> + * - The IB2 is a more complex board intended for GSM phone development
> + * with some logic and a control register, which needs to be accessed
> + * and the board display needs to be turned on explicitly.
> + *
> + * On the Versatile PB, a special CLCD adaptor board is available
> + * supporting the same displays as the Versatile AB, plus one more
> + * Epson QCIF display.
> + *
> + */
Thanks for describing the module at the top!
> +/**
> + * struct versatile_panel_type - lookup struct for the supported panels
> + * @name: the name of this panel
> + * @magic: the magic value from the detection register
> + * @mode: the DRM display mode for this panel
> + * @bus_flags: the DRM bus flags for this panel e.g. inverted clock
> + * @width_mm: the panel width in mm
> + * @height_mm: the panel height in mm
> + * @ib2: the panel may be connected on an IB2 daughterboard
> + */
Optional style suggestion: You can put the kerneldoc field descriptions
inside the struct now, so that they don't end up getting left behind as
people modify the code.
> + /*
> + * Epson L2F50113T00 - 2.2 inch QCIF 176x220 Color TFT
> + * found on the Versatile PB adaptor board connector.
> + */
> + {
> + .name = "Epson L2F50113T00",
> + .magic = SYS_CLCD_ID_EPSON_2_2,
> + .width_mm = 34,
> + .height_mm = 45,
> + .mode = {
> + .clock = 625000000,
> + .hdisplay = 176,
> + .hsync_start = 176 + 2,
> + .hsync_end = 176 + 2 + 3,
> + .htotal = 176 + 2 + 3 + 3,
> + .vdisplay = 220,
> + .vsync_start = 220 + 0,
> + .vsync_end = 220 + 0 + 2,
> + .vtotal = 220 + 0 + 2 + 1,
> + .vrefresh = 390,
> + .flags = 0,
These panels might want PHSYNC/PVSYNC in their flags if they don't want
N.
(I don't get why we have two separate bits for what is a single bit of
information)
> +static int versatile_panel_disable(struct drm_panel *panel)
> +{
> + struct versatile_panel *vpanel = to_versatile_panel(panel);
> +
> + /* If we're on an IB2 daughterboard, turn off display */
> + if (vpanel->ib2_map) {
> + dev_info(vpanel->dev, "disable IB2 display\n");
Looks like disable and enable have a debug printf left in.
With that fixed,
Reviewed-by: Eric Anholt <e...@anholt.net>
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