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DP_TRAINING_AUX_RD_INTERVAL with DP 1.3 spec changed bit scheeme from 8 bits to 7 in DPCD 0x000e. The 8th bit is used to identify extended receiver capabilities. For panels that use this new feature wait interval would be increased by 512 ms, when spec is max 16 ms. This behavior is described in table 2-158 of DP 1.4 spec address 0000eh. With the introduction of DP 1.4 spec main link clock recovery was standardized to 100 us regardless of TRAINING_AUX_RD_INTERVAL value. To avoid breaking panels that are not spec compiant we now warn on invalid values. V2: commit title/message, masking all 7 bits, warn on out of spec values. V3: commit message, make link train clock recovery follow DP 1.4 spec. V4: style changes V5: typo V6: print statement revisions, DP_REV to DPCD_REV, comment correction V7: typo V8: Style V9: Strip out DPCD_REV_XX into seperate patch v10: DPCD_REV_XX to DP_DPCD_REV_XX Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180504221800.17830-2-matthew.s.atwood@intel.com |
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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.