drm/i915/gmbus: Enable burst read

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Support for Burst read in HW is added for HDCP2.2 compliance
requirement.

This patch enables the burst read for all the gmbus read of more than
511Bytes, on capable platforms.

v2:
  Extra line is removed.
v3:
  Macro is added for detecting the BURST_READ Support [Jani]
  Runtime detection of the need for burst_read [Jani]
  Calculation enhancement.
v4:
  GMBUS0 reg val is passed from caller [ville]
  Removed a extra var [ville]
  Extra brackets are removed [ville]
  Implemented the handling of 512Bytes Burst Read.
v5:
  Burst read max length is fixed at 767Bytes [Ville]
v6:
  Collecting the received reviewed-by.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1530192889-5789-3-git-send-email-ramalingam.c@intel.com

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This commit is contained in:

Ramalingam C 2018-06-28 19:04:49 +05:30 • committed by Daniel Vetter

parent 73675cf697

commit d5dc0f43f2

3 changed files with 55 additions and 10 deletions

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3

drivers/gpu/drm/i915/i915_drv.h

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1

drivers/gpu/drm/i915/i915_reg.h

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61

drivers/gpu/drm/i915/intel_i2c.c

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