HSW/LPT clocking code additional sequences

From: Paulo Zanoni <[email protected]>

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(-)

1.8.1.2