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    • Wu Fengguang's avatar
      drm/i915: pass ELD to HDMI/DP audio driver · e0dac65e
      Wu Fengguang authored
      
      
      Add ELD support for Intel Eaglelake, IbexPeak/Ironlake,
      SandyBridge/CougarPoint and IvyBridge/PantherPoint chips.
      
      ELD (EDID-Like Data) describes to the HDMI/DP audio driver the audio
      capabilities of the plugged monitor. It's built and passed to audio
      driver in 2 steps:
      
      (1) at get_modes time, parse EDID and save ELD to drm_connector.eld[]
      
      (2) at mode_set time, write drm_connector.eld[] to the Transcoder's hw
          ELD buffer and set the ELD_valid bit to inform HDMI/DP audio driver
      
      This patch is tested OK on G45/HDMI, IbexPeak/HDMI and IvyBridge/HDMI+DP.
      Test scheme: plug in the HDMI/DP monitor, and run
      
              cat /proc/asound/card0/eld*
      
      to check if the monitor name, HDMI/DP type, etc. show up correctly.
      
      Minor imperfection: the GEN5_AUD_CNTL_ST/DIP_Port_Select field always
      reads 0 (reserved). Without knowing the port number, I worked it around
      by setting the ELD_valid bit for ALL the three ports. It's tested to not
      be a problem, because the audio driver will find invalid ELD data and
      hence rightfully abort, even when it sees the ELD_valid indicator.
      
      Thanks to Zhenyu and Pierre-Louis for a lot of valuable help and testing.
      
      CC: Zhao Yakui <yakui.zhao@intel.com>
      CC: Wang Zhenyu <zhenyu.z.wang@intel.com>
      CC: Jeremy Bush <contractfrombelow@gmail.com>
      CC: Christopher White <c.white@pulseforce.com>
      CC: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
      CC: Paul Menzel <paulepanter@users.sourceforge.net>
      Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
      Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
      e0dac65e
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