Use mainline goodix driver

Closes #23

See merge request Librem5/linux-emcraft!12

# Conflicts:
#   arch/arm64/configs/librem5-evk_defconfig

f/imx8-4.18/drm updates: Tie devkit panel to backlight

See merge request Librem5/linux-emcraft!11

librem5-evk-lcdonly: Bind backlight device to panel

See merge request !10

librem5-evk: Strip down defconfig

See merge request Librem5/linux-emcraft!8

We're using the mainline driver now.

This reverts commit 14aab0cf.

We need to mark the GPIO pins as active high since other wise the reset
sequence is inverted.

Using the mainline driver gives us the right scaling.

Closes: #23
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Signed-off-by: Guido Günther <guido.gunther@puri.sm>

We want to use the mainline driver
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

This makes it way easier to track changes
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

This make sure we don't turn on the panel backlight early.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Signed-off-by: Guido Günther <guido.gunther@puri.sm>

So far enable did nother but disable put the panel into sleep mode.  Use
mipi_dsi_dcs_set_display_{on,off} only.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

This makes it way easier to track changes
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

librem5-evk: Drop the panel power on delay

See merge request !7

This saves 0.5s on boot and we have the timing in the panel driver
correct now so it's not needed.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Some imx8 variants have errata against enabling ODE for i2c and mdio.
Disabling it on the im8mq seems to fix i2c timeouts and mdio
timeouts.

librem5-evk: Use a percent scaled brightness

See merge request Librem5/linux-emcraft!6

Panel cleanups

See merge request Librem5/linux-emcraft!4

We're using a DSI generic write not a DCS one.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

ext2: Enable posix ACLs

See merge request Librem5/linux-emcraft!5

This allows for smother dimming.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

This helps setting up permissions on /boot.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

We already sleep in prepare.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Now that we verified it works.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

We changed the porch values a while ago so the comment was outdated and
we're close to the vendor suggested 75000 khz now so use the exact
value.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

We don't need that atm.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

This fixes a config prompt after enabling CONFIG_HARDENED_USERCOPY
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Enable HARDENED_USERCOPY

See merge request Librem5/linux-emcraft!2

librem5-evk_defconfig : Enable USB_SERIAL_OPTION for modem TTYs

See merge request Librem5/linux-emcraft!1

So far we used a brighness of 0 so it would not turn on before systemd's
backlight handling ran.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Signed-off-by: Guido Günther <guido.gunther@puri.sm>

Signed-off-by: Guido Günther <guido.gunther@puri.sm>