+static bool intel_edp_is_psr_enabled(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (!IS_HASWELL(dev))
+ return false;
+
+ return I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE;
+}
+
+static void intel_edp_psr_write_vsc(struct intel_dp *intel_dp,
+ struct edp_vsc_psr *vsc_psr)
+{
+ struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
+ u32 ctl_reg = HSW_TVIDEO_DIP_CTL(crtc->config.cpu_transcoder);
+ u32 data_reg = HSW_TVIDEO_DIP_VSC_DATA(crtc->config.cpu_transcoder);
+ uint32_t *data = (uint32_t *) vsc_psr;
+ unsigned int i;
+
+ /* As per BSPec (Pipe Video Data Island Packet), we need to disable
+ the video DIP being updated before program video DIP data buffer
+ registers for DIP being updated. */
+ I915_WRITE(ctl_reg, 0);
+ POSTING_READ(ctl_reg);
+
+ for (i = 0; i < VIDEO_DIP_VSC_DATA_SIZE; i += 4) {
+ if (i < sizeof(struct edp_vsc_psr))
+ I915_WRITE(data_reg + i, *data++);
+ else
+ I915_WRITE(data_reg + i, 0);
+ }
+
+ I915_WRITE(ctl_reg, VIDEO_DIP_ENABLE_VSC_HSW);
+ POSTING_READ(ctl_reg);
+}
+
+static void intel_edp_psr_setup(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct edp_vsc_psr psr_vsc;
+
+ if (intel_dp->psr_setup_done)
+ return;
+
+ /* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
+ memset(&psr_vsc, 0, sizeof(psr_vsc));
+ psr_vsc.sdp_header.HB0 = 0;
+ psr_vsc.sdp_header.HB1 = 0x7;
+ psr_vsc.sdp_header.HB2 = 0x2;
+ psr_vsc.sdp_header.HB3 = 0x8;
+ intel_edp_psr_write_vsc(intel_dp, &psr_vsc);
+
+ /* Avoid continuous PSR exit by masking memup and hpd */
+ I915_WRITE(EDP_PSR_DEBUG_CTL, EDP_PSR_DEBUG_MASK_MEMUP |
+ EDP_PSR_DEBUG_MASK_HPD);
+
+ intel_dp->psr_setup_done = true;
+}
+
+static void intel_edp_psr_enable_sink(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ uint32_t aux_clock_divider = get_aux_clock_divider(intel_dp);
+ int precharge = 0x3;
+ int msg_size = 5; /* Header(4) + Message(1) */
+
+ /* Enable PSR in sink */
+ if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT)
+ intel_dp_aux_native_write_1(intel_dp, DP_PSR_EN_CFG,
+ DP_PSR_ENABLE &
+ ~DP_PSR_MAIN_LINK_ACTIVE);
+ else
+ intel_dp_aux_native_write_1(intel_dp, DP_PSR_EN_CFG,
+ DP_PSR_ENABLE |
+ DP_PSR_MAIN_LINK_ACTIVE);
+
+ /* Setup AUX registers */
+ I915_WRITE(EDP_PSR_AUX_DATA1, EDP_PSR_DPCD_COMMAND);
+ I915_WRITE(EDP_PSR_AUX_DATA2, EDP_PSR_DPCD_NORMAL_OPERATION);
+ I915_WRITE(EDP_PSR_AUX_CTL,
+ DP_AUX_CH_CTL_TIME_OUT_400us |
+ (msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
+ (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
+ (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
+}
+
+static void intel_edp_psr_enable_source(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ uint32_t max_sleep_time = 0x1f;
+ uint32_t idle_frames = 1;
+ uint32_t val = 0x0;
+
+ if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT) {
+ val |= EDP_PSR_LINK_STANDBY;
+ val |= EDP_PSR_TP2_TP3_TIME_0us;
+ val |= EDP_PSR_TP1_TIME_0us;
+ val |= EDP_PSR_SKIP_AUX_EXIT;
+ } else
+ val |= EDP_PSR_LINK_DISABLE;
+
+ I915_WRITE(EDP_PSR_CTL, val |
+ EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES |
+ max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
+ idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
+ EDP_PSR_ENABLE);
+}
+
+void intel_edp_psr_enable(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+
+ if (!is_edp_psr(intel_dp) || intel_edp_is_psr_enabled(dev))
+ return;
+
+ /* Setup PSR once */
+ intel_edp_psr_setup(intel_dp);
+
+ /* Enable PSR on the panel */
+ intel_edp_psr_enable_sink(intel_dp);
+
+ /* Enable PSR on the host */
+ intel_edp_psr_enable_source(intel_dp);
+}
+
+void intel_edp_psr_disable(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (!intel_edp_is_psr_enabled(dev))
+ return;
+
+ I915_WRITE(EDP_PSR_CTL, I915_READ(EDP_PSR_CTL) & ~EDP_PSR_ENABLE);
+
+ /* Wait till PSR is idle */
+ if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL) &
+ EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
+ DRM_ERROR("Timed out waiting for PSR Idle State\n");
+}
+