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eDP spec says - "If PSR/PSR2 is supported, the SET_POWER_CAPABLE bit in the EDP_GENERAL_CAPABILITY_1 register (DPCD Address 00701h, bit d7) must be set to 1." Reject PSR on panels without this cap bit set as such panels cannot be controlled via SET_POWER & SET_DP_PWR_VOLTAGE register and the DP source needs to be able to do that for PSR. Thanks to Nathan for debugging this. Panel cap checks like this can be done just once, let's fix this when PSR dpcd init movement lands. Cc: Nathan D Ciobanu <nathan.d.ciobanu@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Tested-by: Nathan Ciobanu <nathan.d.ciobanu@linux.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/20180227032723.15474-1-dhinakaran.pandiyan@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.