In non PC system, such as IVI, may not use BIOS, instead it uses boot loader with only minimal system initialization. Most of the time, boot loader doesn't come with VBIOS, and depends on device driver to fully initialize the display controller and GPU.
For Valleyview, without VBIOS, i915 fails to work. The patch add some missing init code, such as doing a DPIO CMNRESET and program the GMBUS frequency. Chon Ming Lee (2): drm/i915: Send a DPIO cmnreset during driver load or system resume. drm/i915: Program GMBUS Frequency based on the CDCLK drivers/gpu/drm/i915/i915_reg.h | 8 ++++++ drivers/gpu/drm/i915/intel_i2c.c | 43 +++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_uncore.c | 15 ++++++++++++ 3 files changed, 66 insertions(+), 0 deletions(-) -- 1.7.7.6 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
