drm/i915: Adjust system agent voltage on CNL if required by DDI ports
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Tue, 24 Oct 2017 09:52:14 +0000 (12:52 +0300)
committerVille Syrjälä <ville.syrjala@linux.intel.com>
Wed, 25 Oct 2017 10:40:52 +0000 (13:40 +0300)
commit53e9bf5e8159765e0dc807567180afd0b389f149
tree3c0a0ad64eeb2e560da342b52bbefe96a8479684
parent48469eced282155608a80a37626d28a0abd3c2e5
drm/i915: Adjust system agent voltage on CNL if required by DDI ports

On CNL we may need to bump up the system agent voltage not only due
to CDCLK but also when driving DDI port with a sufficiently high clock.
To that end start tracking the minimum acceptable voltage for each crtc.
We do the tracking via crtcs because we don't have any kind of encoder
state. Also there's no downside to doing it this way, and it matches how
we track cdclk requirements on account of pixel rate.

v2: Allow disabled crtcs to use the min voltage
    Add IS_CNL check to intel_ddi_compute_min_voltage() since
    we're using CNL specific values there
    s/intel_compute_min_voltage/cnl_compute_min_voltage/ since
    the function makes hw specific assumptions about the voltage
    values
v3: Drop the test hack leftovers from skl_modeset_calc_cdclk()
v4: s/voltage/voltage_level/ (Rodrigo)
    Replace DPLL DVFS FIXMEs with an explanation why we don't
    do anything there (Rodrigo)

Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024095216.1638-9-ville.syrjala@linux.intel.com
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/intel_cdclk.c
drivers/gpu/drm/i915/intel_ddi.c
drivers/gpu/drm/i915/intel_display.c
drivers/gpu/drm/i915/intel_dp_mst.c
drivers/gpu/drm/i915/intel_dpll_mgr.c
drivers/gpu/drm/i915/intel_drv.h