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Currently intel_dp_check_link_status() tries to retrain the link if Clock recovery or Channel EQ for any of the lanes indicated by intel_dp->lane_count is not set. However these values cached in intel_dp structure can be stale if link training has failed for these values during previous modeset. Or these values can get stale since we have now re read the DPCD registers or it can be 0 in case of connected boot case. This patch validates these values against the max link rate and max lane count values. This is absolutely required incase the common_rates or max lane count are now different due to link fallback. v2: * Include the FIXME commnet inside the function (Ville Syrjala) * Remove the redundant parenthesis (Ville Syrjala) v3 by Jani: * rebase on the DP refactoring series * rename intel_dp_link_params_is_valid to intel_dp_link_params_valid * minor stylistic changes v4: * Compare the link rate against max link rate not the common_rates since common_rates does not account for the lowered fallback link rate value. (Ville Syrjala) v5: * Fixed a warning for unused variable (Manasi) Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1491512412-30016-1-git-send-email-manasi.d.navare@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.