Commit Graph

2 Commits

Author SHA1 Message Date
Dan Carpenter
85b4587f8e drm/panel: rpi-touchscreen: propagate errors in rpi_touchscreen_i2c_read()
There is one caller which checks whether rpi_touchscreen_i2c_read()
returns negative error codes.  Currently it can't because negative
error codes are truncated to u8, but that's easy to fix if we change the
type to int.

Fixes: 2f733d6194 ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20171020002845.kar2wg7gqxg7tzqi@mwanda
Reviewed-by: Eric Anholt <eric@anholt.net>
2017-10-30 16:55:20 -07:00
Eric Anholt
2f733d6194 drm/panel: Add support for the Raspberry Pi 7" Touchscreen.
This driver communicates with the Atmel microcontroller for sequencing
the poweron of the TC358762 DSI-DPI bridge and controlling the
backlight PWM.

v2: Set the same default orientation as the closed source firmware
    used, which is the best for viewing angle.
v3: Rewrite as an i2c client driver after bridge driver rejection.
v4: Finish probe without the DSI host, using the new delayed
    registration, and attach to the host during mipi_dsi_driver probe.
v5: Rework to drop the "probe without DSI host" mode again, now that
    vc4 will create the host early on.
v6: Drop unused brightness #define (noticed by Thierry)

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20170927193654.12609-4-eric@anholt.net
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Acked-by: Thierry Reding <treding@nvidia.com>
2017-10-06 12:10:16 -07:00