[Intel-gfx] [PATCH 0/7] HSW/LPT clocking code additional sequences

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

Hi

On the code that allows Package C8+ we need to disable/reenable the PCH
reference clocks and also disable/reenable LCPLL. This series implements the
sequences that are going to be needed. I have local patches that use this code
and they seem to work (we survive going to C10 and back to C7), and I also sent
earlier versions of these patches to the mailing list, so open-source code that
uses these functions already exists on the intel-gfx mailing list. The goal here
is allow people to review/merge this while the final PC8+ patches are not yet
100% reviewer-compliant.

On the first 3 patches we massage our code so we can reuse it for PC8+ code. On
patch 4 we extend the current code to also implement one of the sequences
required by PC8+. On patch 5 we implement the equivalent disable sequence, also
needed by PC8+. On patch 6 we implement the functions to disable and restore
LCPLL, and on patch 7 we add some assertions that are going to be used.

If you want to review patches 1-3 all you need is C experience. For patches 4
and 5 you need to read the "Display iCLK programming" chapter of BSpec. For
patches 6 and 7 you need to read "Display sequences for LCPLL disabling" and
"Display sequences for Package C8".

Cheers,
Paulo

Paulo Zanoni (7):
  drm/i915: remove SDV support from lpt_pch_init_refclk
  drm/i915: extract FDI mPHY functions from lpt_init_pch_refclk
  drm/i915: extract lpt_enable_clkout_dp from lpt_init_pch_refclk
  drm/i915: extend lpt_enable_clkout_dp
  drm/i915: disable CLKOUT_DP when it's not needed
  drm/i915: add functions to disable and restore LCPLL
  drm/i915: add some assertions to hsw_disable_lcpll

 drivers/gpu/drm/i915/i915_reg.h      |  17 ++
 drivers/gpu/drm/i915/intel_display.c | 359 +++++++++++++++++++++++++----------
 drivers/gpu/drm/i915/intel_drv.h     |   3 +
 3 files changed, 276 insertions(+), 103 deletions(-)

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1.8.1.2