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When the pipe_config's update_pipe flag is set we may need to update the panel fitting settings. On GEN9+ this means we need to update the crtc's scaler settings. This fixes the following WARN_ON, during i915 loading on an Asrock B150M Pro4S/D3 board with an i5-6500 CPU / graphics: [drm:pipe_config_err [i915]] *ERROR* mismatch in pch_pfit.enabled (expected no, found yes) pipe state doesn't match! WARNING: CPU: 3 PID: 305 at drivers/gpu/drm/i915/intel_display.c:12084 With line 12084 being the I915_STATE_WARN call inside the "if (!intel_pipe_config_compare())" block in verify_crtc_state(). On this board with 2 1920x1080 monitors connected over HDMI the GOP initializes both monitors at 1920x1080 and despite no scaling being necessary configures a scaler for one of them. When booting with fastboot=1 on the initial modeset needs_modeset will be false while update_pipe is true. Since we were not calling skl_update_scaler_crtc() in this case we would leave the scaler enabled causing this error. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181217141903.4182-1-hdegoede@redhat.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.