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13ea6db2cf
Few edp panels like Sharp is triggering short and long hpd pulse after panel is getting powered off. Currently driver is already ignoring long pulse for eDP panel but in order to process the short pulse, it turns on the VDD which requires panel power_cycle_delay + panel_power_on_delay these delay on Sharp panel introduced the responsiveness overhead of 800ms in the modeset sequence and as well is in suspend sequence. Ignoring any short pulse if panel is powered off. FIXME: It requires to wait for panel_power_off delay in order to check the panel power status due to pps_lock because panel triggers short pulse immediately after writing PP_OFF to PP_CTRL register and wait_panel_off waits for panel_power_off delay with pps_lock held. This still creates responsiveness overhead of panel_power_off delay. v2: - checking vdd along with panel power to ignore the hpd. [Jani,Ville] v3: - safer side check to ignore the long hpd when eDP have power, adding type of hpd to debug log. [Jani] Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Uma Shankar <uma.shankar@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200318081837.23983-1-anshuman.gupta@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.