1. 04 Jan, 2018 2 commits
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  3. 02 Jan, 2018 2 commits
  4. 28 Dec, 2017 2 commits
  5. 23 Dec, 2017 1 commit
    • Hans de Goede's avatar
      drm/i915/vlv: Add cdclk workaround for DSI · c8dae55a
      Hans de Goede authored
      At least on the Chuwi Vi8 (non pro/plus) the LCD panel will show an image
      shifted aprox. 20% to the left (with wraparound) and sometimes also wrong
      colors, showing that the panel controller is starting with sampling the
      datastream somewhere mid-line. This happens after the first blanking and
      re-init of the panel.
      
      After looking at drm.debug output I noticed that initially we inherit the
      cdclk of 333333 KHz set by the GOP, but after the re-init we picked 266667
      KHz, which turns out to be the cause of this problem, a quick hack to hard
      code the cdclk to 333333 KHz makes the problem go away.
      
      I've tested this on various Bay Trail devices, to make sure this not does
      cause regressions on other devices and the higher cdclk does not cause
      any problems on the following devices:
      -GP-electronic T701      1024x600   333333 KHz cdclk after this patch
      -PEAQ C1010              1920x1200  333333 KHz cdclk after this patch
      -PoV mobii-wintab-800w    800x1280  333333 KHz cdclk after this patch
      -Asus Transformer-T100TA 1368x768   320000 KHz cdclk after this patch
      
      Also interesting wrt this is the comment in vlv_calc_cdclk about the
      existing workaround to avoid 200 Mhz as clock because that causes issues
      in some cases.
      
      This commit extends the "do not use 200 Mhz" workaround with an extra
      check to require atleast 320000 KHz (avoiding 266667 KHz) when a DSI
      panel is active.
      
      Changes in v2:
      -Change the commit message and the code comment to not treat the GOP as
       a reference, the GOP should not be treated as a reference
      Acked-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
      Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20171220105017.11259-1-hdegoede@redhat.com
      c8dae55a
  6. 22 Dec, 2017 22 commits