| Message ID | 20170108134427.8392-8-hdegoede@redhat.com |
|---|---|
| State | Awaiting Upstream |
| Headers | show |
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@redhat.com> > Tested-by: tagorereddy <tagore.chandan@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:
Hi, On 08-01-17 16:34, Andy Shevchenko wrote: > 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. Ah, yes that as an interesting point. So what do the i915 devs think of changing the i915 code to use the iosf_mbi functions for at least punit accesses, instead of doing those through the i915 pci config space? Note that we will still need to have some higher level locking, or a new iosf_mbi function which does this under a lock, for code paths where the i915 code does a write followed by multiple reads to wait for the punit to have changed the value to the requested value. Regards, Hans > > >> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=155241 >> Signed-off-by: Hans de Goede <hdegoede@redhat.com> >> Tested-by: tagorereddy <tagore.chandan@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: > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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: