On Sun, 2017-01-08 at 14:44 +0100, Hans de Goede wrote: > Make sure the punit i2c bus is not in use when we send a request to > the punit by calling iosf_mbi_punit_lock() / iosf_mbi_punit_unlock() > around punit write accesses. >
But should not i915 drm eventually share the same iosf_mbi driver? Currently what you are doing you create notifier and all that not-best- ever stuff due to having two accessors to IOSF MB. If we have only one driver which i915 will not ignore you don't need to create such things. That's what I was trying to imply when commenting one of the patch in previous series. > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=155241 > Signed-off-by: Hans de Goede <hdegoede at redhat.com> > Tested-by: tagorereddy <tagore.chandan at gmail.com> > --- >  drivers/gpu/drm/i915/intel_display.c    | 6 ++++++ >  drivers/gpu/drm/i915/intel_pm.c         | 9 +++++++++ >  drivers/gpu/drm/i915/intel_runtime_pm.c | 9 +++++++++ >  3 files changed, 24 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index fec8eb3..b8be6ea 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -47,6 +47,7 @@ >  #include <drm/drm_rect.h> >  #include <linux/dma_remapping.h> >  #include <linux/reservation.h> > +#include <asm/iosf_mbi.h> >  >  static bool is_mmio_work(struct intel_flip_work *work) >  { > @@ -6423,6 +6424,8 @@ static void valleyview_set_cdclk(struct > drm_device *dev, int cdclk) >  cmd = 0; >  >  mutex_lock(&dev_priv->rps.hw_lock); > + iosf_mbi_punit_lock(); > + >  val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); >  val &= ~DSPFREQGUAR_MASK; >  val |= (cmd << DSPFREQGUAR_SHIFT); > @@ -6432,6 +6435,7 @@ static void valleyview_set_cdclk(struct > drm_device *dev, int cdclk) >       50)) { >  DRM_ERROR("timed out waiting for CDclk change\n"); >  } > + iosf_mbi_punit_unlock(); >  mutex_unlock(&dev_priv->rps.hw_lock); >  >  mutex_lock(&dev_priv->sb_lock); > @@ -6499,6 +6503,7 @@ static void cherryview_set_cdclk(struct > drm_device *dev, int cdclk) >  cmd = DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, cdclk) - 1; >  >  mutex_lock(&dev_priv->rps.hw_lock); > + iosf_mbi_punit_lock(); >  val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); >  val &= ~DSPFREQGUAR_MASK_CHV; >  val |= (cmd << DSPFREQGUAR_SHIFT_CHV); > @@ -6508,6 +6513,7 @@ static void cherryview_set_cdclk(struct > drm_device *dev, int cdclk) >       50)) { >  DRM_ERROR("timed out waiting for CDclk change\n"); >  } > + iosf_mbi_punit_unlock(); >  mutex_unlock(&dev_priv->rps.hw_lock); >  >  intel_update_cdclk(dev_priv); > diff --git a/drivers/gpu/drm/i915/intel_pm.c > b/drivers/gpu/drm/i915/intel_pm.c > index 4b12637..0d55b61 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -32,6 +32,7 @@ >  #include "../../../platform/x86/intel_ips.h" >  #include <linux/module.h> >  #include <drm/drm_atomic_helper.h> > +#include <asm/iosf_mbi.h> >  >  /** >  * DOC: RC6 > @@ -276,6 +277,7 @@ static void chv_set_memory_dvfs(struct > drm_i915_private *dev_priv, bool enable) >  u32 val; >  >  mutex_lock(&dev_priv->rps.hw_lock); > + iosf_mbi_punit_lock(); >  >  val = vlv_punit_read(dev_priv, PUNIT_REG_DDR_SETUP2); >  if (enable) > @@ -290,6 +292,7 @@ static void chv_set_memory_dvfs(struct > drm_i915_private *dev_priv, bool enable) >        FORCE_DDR_FREQ_REQ_ACK) == 0, 3)) >  DRM_ERROR("timed out waiting for Punit DDR DVFS > request\n"); >  > + iosf_mbi_punit_unlock(); >  mutex_unlock(&dev_priv->rps.hw_lock); >  } >  > @@ -298,6 +301,7 @@ static void chv_set_memory_pm5(struct > drm_i915_private *dev_priv, bool enable) >  u32 val; >  >  mutex_lock(&dev_priv->rps.hw_lock); > + iosf_mbi_punit_lock(); >  >  val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); >  if (enable) > @@ -306,6 +310,7 @@ static void chv_set_memory_pm5(struct > drm_i915_private *dev_priv, bool enable) >  val &= ~DSP_MAXFIFO_PM5_ENABLE; >  vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val); >  > + iosf_mbi_punit_unlock(); >  mutex_unlock(&dev_priv->rps.hw_lock); >  } >  > @@ -4546,6 +4551,7 @@ void vlv_wm_get_hw_state(struct drm_device *dev) >  >  if (IS_CHERRYVIEW(dev_priv)) { >  mutex_lock(&dev_priv->rps.hw_lock); > + iosf_mbi_punit_lock(); >  >  val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); >  if (val & DSP_MAXFIFO_PM5_ENABLE) > @@ -4575,6 +4581,7 @@ void vlv_wm_get_hw_state(struct drm_device *dev) >  wm->level = VLV_WM_LEVEL_DDR_DVFS; >  } >  > + iosf_mbi_punit_unlock(); >  mutex_unlock(&dev_priv->rps.hw_lock); >  } >  > @@ -4981,7 +4988,9 @@ static void valleyview_set_rps(struct > drm_i915_private *dev_priv, u8 val) >  I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val)); >  >  if (val != dev_priv->rps.cur_freq) { > + iosf_mbi_punit_lock(); >  vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, > val); > + iosf_mbi_punit_unlock(); >  if (!IS_CHERRYVIEW(dev_priv)) >  gen6_set_rps_thresholds(dev_priv, val); >  } > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c > b/drivers/gpu/drm/i915/intel_runtime_pm.c > index c0b7e95..17922ae 100644 > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c > @@ -28,6 +28,7 @@ >  >  #include <linux/pm_runtime.h> >  #include <linux/vgaarb.h> > +#include <asm/iosf_mbi.h> >  >  #include "i915_drv.h" >  #include "intel_drv.h" > @@ -1027,6 +1028,8 @@ static void vlv_set_power_well(struct > drm_i915_private *dev_priv, >  if (COND) >  goto out; >  > + iosf_mbi_punit_lock(); > + >  ctrl = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_CTRL); >  ctrl &= ~mask; >  ctrl |= state; > @@ -1037,6 +1040,8 @@ static void vlv_set_power_well(struct > drm_i915_private *dev_priv, >    state, >    vlv_punit_read(dev_priv, > PUNIT_REG_PWRGT_CTRL)); >  > + iosf_mbi_punit_unlock(); > + >  #undef COND >  >  out: > @@ -1643,6 +1648,8 @@ static void chv_set_pipe_power_well(struct > drm_i915_private *dev_priv, >  if (COND) >  goto out; >  > + iosf_mbi_punit_lock(); > + >  ctrl = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ); >  ctrl &= ~DP_SSC_MASK(pipe); >  ctrl |= enable ? DP_SSC_PWR_ON(pipe) : DP_SSC_PWR_GATE(pipe); > @@ -1653,6 +1660,8 @@ static void chv_set_pipe_power_well(struct > drm_i915_private *dev_priv, >    state, >    vlv_punit_read(dev_priv, > PUNIT_REG_DSPFREQ)); >  > + iosf_mbi_punit_unlock(); > + >  #undef COND >  >  out: -- Andy Shevchenko <andriy.shevchenko at linux.intel.com> Intel Finland Oy