diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index e90ec21dd9b2..0e84558c053a 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -263,6 +263,28 @@ static const struct cxsr_latency *intel_get_cxsr_latency(int is_desktop, return NULL; } +static void chv_set_memory_dvfs(struct drm_i915_private *dev_priv, bool enable) +{ + u32 val; + + mutex_lock(&dev_priv->rps.hw_lock); + + val = vlv_punit_read(dev_priv, PUNIT_REG_DDR_SETUP2); + if (enable) + val &= ~FORCE_DDR_HIGH_FREQ; + else + val |= FORCE_DDR_HIGH_FREQ; + val &= ~FORCE_DDR_LOW_FREQ; + val |= FORCE_DDR_FREQ_REQ_ACK; + vlv_punit_write(dev_priv, PUNIT_REG_DDR_SETUP2, val); + + if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DDR_SETUP2) & + FORCE_DDR_FREQ_REQ_ACK) == 0, 3)) + DRM_ERROR("timed out waiting for Punit DDR DVFS request\n"); + + mutex_unlock(&dev_priv->rps.hw_lock); +} + static void chv_set_memory_pm5(struct drm_i915_private *dev_priv, bool enable) { u32 val; @@ -310,6 +332,7 @@ void intel_set_memory_cxsr(struct drm_i915_private *dev_priv, bool enable) enable ? "enabled" : "disabled"); } + /* * Latency for FIFO fetches is dependent on several factors: * - memory configuration (speed, channels) @@ -1020,6 +1043,17 @@ static void valleyview_update_wm(struct drm_crtc *crtc) wm.pipe[pipe].primary, wm.pipe[pipe].cursor, wm.sr.plane, wm.sr.cursor); + /* + * FIXME DDR DVFS introduces massive memory latencies which + * are not known to system agent so any deadline specified + * by the display may not be respected. To support DDR DVFS + * the watermark code needs to be rewritten to essentially + * bypass deadline mechanism and rely solely on the + * watermarks. For now disable DDR DVFS. + */ + if (IS_CHERRYVIEW(dev_priv)) + chv_set_memory_dvfs(dev_priv, false); + if (!cxsr_enabled) intel_set_memory_cxsr(dev_priv, false); |