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The firmware may have set up the pipe correctly, but the FIFO underrun and CRC interrupts are likely not enabled. This resulted in debugfs_test.read_all_entries failing on haswell, because of a timeout when reading the crc debugfs entry. Solve this by enabling FIFO underrun reporting after the initial fastset, which lets interrupts be generated as expected. Changes since v1: - Always enable CPU FIFO underrun reporting for >GEN2, and handle GEN2 correctly. Changes since v2: - Remove unneeded HAS_DDI, simplify GEN2 case. Changes since v3: - Use intel_crtc_pch_transcoder to determine pch transcoder for underruns. (Ville) - Remove crtc->config dereference in intel_crtc_pch_transcoder. (Ville) Testcase: debugfs_test.read_all_entries Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171113144043.58658-1-maarten.lankhorst@linux.intel.com Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.