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899f9d7bbc
Populate conn_state->max_bpc with something sensible from the start. Otherwise it's possible that we get to compute_sink_pipe_bpp() with max_bpc==0. The specific scenario goes as follows: 1. Initial connector state allocated with max_bpc==0 2. Trigger a modeset on the crtc feeding the connector, without actually adding the connector to the commit 3. drm_atomic_connector_check() is skipped because the connector has not yet been added, hence conn_state->max_bpc retains its current value 4. drm_atomic_helper_check_modeset() -> drm_atomic_add_affected_connectors() -> the connector is now part of the commit 5. compute_baseline_pipe_bpp() -> MISSING_CASE(max_bpc==0) Note that pipe_bpp itself may not be populated on pre-g4x machines, in which case we just fall back to max_bpc==8 and let .compute_config() limit the resulting pipe_bpp further if necessary. Cc: Daniel Vetter <daniel@ffwll.ch> Reported-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210216160035.4780-1-ville.syrjala@linux.intel.com Tested-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
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.