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Psr1 and psr2 are mutually exclusive,ie when psr2 is enabled, psr1 should be disabled.When psr2 is exited , bit 31 of reg PSR2_CTL must be set to 0 but currently bit 31 of SRD_CTL (psr1 control register)is set to 0. Also ,PSR2_IDLE state is looked up from SRD_STATUS(psr1 register) instead of PSR2_STATUS register, which has wrong data, resulting in blankscreen. hsw_enable_source is split into hsw_enable_source_psr1 and hsw_enable_source_psr2 for easier code review and maintenance, as suggested by rodrigo and jim. v2: (Rodrigo) - Rename hsw_enable_source_psr* to intel_enable_source_psr* v3: (Rodrigo) - In hsw_psr_disable , 1) for psr active case, handle psr2 followed by psr1. 2) psr inactive case, handle psr2 followed by psr1 v4:(Rodrigo) - move psr2 restriction(32X20) to match_conditions function returning false and fully blocking PSR to a new patch before this one. v5: in source_psr2, removed val = EDP_PSR_ENABLE Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Jim Bride <jim.bride@linux.intel.com> Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@intel.com> Signed-off-by: Patil Deepti <deepti.patil@intel.com> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1484244059-9201-1-git-send-email-vathsala.nagaraju@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.