drm/i915: add runtime PM support on Haswell

The code to enable/disable PC8 already takes care of saving and
restoring all the registers we need to save/restore, so do a put()
call when we enable PC8 and a get() call when we disable it.

Ideally, in order to make it easier to add runtime PM support to other
platforms, we should move some things from the PC8 code to the runtime
PM code, but let's do this later, since we can make Haswell work right
now.

V2: - Rebase

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
[danvet: Don't actually enable runtime pm since I didn't merge all
patches.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d3a3fba6436106dc0ed450f11dec53eb05df9d4e..7b1b18d8f45cae1e6501b76c68f9528bf54233f7 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6656,6 +6656,8 @@ void hsw_enable_pc8_work(struct work_struct *__work)
        lpt_disable_clkout_dp(dev);
        hsw_pc8_disable_interrupts(dev);
        hsw_disable_lcpll(dev_priv, true, true);
+
+       intel_runtime_pm_put(dev_priv);
 }
 
 static void __hsw_enable_package_c8(struct drm_i915_private *dev_priv)
@@ -6693,6 +6695,8 @@ static void __hsw_disable_package_c8(struct drm_i915_private *dev_priv)
 
        DRM_DEBUG_KMS("Disabling package C8+\n");
 
+       intel_runtime_pm_get(dev_priv);
+
        hsw_restore_lcpll(dev_priv);
        hsw_pc8_restore_interrupts(dev);
        lpt_init_pch_refclk(dev);