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Brian Norris 8fb6c44fe8 drm/bridge: analogix_dp: Grab runtime PM reference for DP-AUX
If the display is not enable()d, then we aren't holding a runtime PM
reference here. Thus, it's easy to accidentally cause a hang, if user
space is poking around at /dev/drm_dp_aux0 at the "wrong" time.

Let's get a runtime PM reference, and check that we "see" the panel.
Don't force any panel power-up, etc., because that can be intrusive, and
that's not what other drivers do (see
drivers/gpu/drm/bridge/ti-sn65dsi86.c and
drivers/gpu/drm/bridge/parade-ps8640.c.)

Fixes: 0d97ad03f4 ("drm/bridge: analogix_dp: Remove duplicated code")
Cc: <stable@vger.kernel.org>
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220301181107.v4.1.I773a08785666ebb236917b0c8e6c05e3de471e75@changeid
2022-03-09 08:00:39 -08:00
arch sysfb: Enable boot time VESA graphic mode selection 2022-03-04 20:55:33 +01:00
block
certs
crypto
Documentation dt-bindings: display: sitronix, st7735r: Remove spi-max-frequency limit 2022-03-09 10:28:37 +00:00
drivers drm/bridge: analogix_dp: Grab runtime PM reference for DP-AUX 2022-03-09 08:00:39 -08:00
fs
include drm/dsi: transfer DSI HS packets ending at the same time 2022-03-09 14:14:36 +01:00
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MAINTAINERS drm/bridge: Add myself as a reviewer for the Parade PS8640 bridge chip 2022-03-09 07:53:32 -08:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.