drm/i915/skl: Enabling PSR2 SU with frame sync

We make use of HW tracking for Selective update region and enable frame sync on
sink. We use hardware's hardcoded data values for frame sync and GTC.

v2: Add 3200x2000 resolution restriction with PSR2, move psr2_support to i915_psr
struct, add aux_frame_sync to independently control aux frame sync, rename the
TP2 TIME macro for 2500us (Rodrigo, Siva)
v3: Moving the resolution restriction to intel_psr_enable so that we check it
only once(Durga)

Cc: Durgadoss R <durgadoss.r@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 37 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 9668735fce52..27608ce19b1c 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -117,6 +117,19 @@ static void vlv_psr_setup_vsc(struct intel_dp *intel_dp)
         I915_WRITE(VLV_VSCSDP(pipe), val);
 }
 
+static void skl_psr_setup_su_vsc(struct intel_dp *intel_dp)
+{
+        struct edp_vsc_psr psr_vsc;
+
+        /* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
+        memset(&psr_vsc, 0, sizeof(psr_vsc));
+        psr_vsc.sdp_header.HB0 = 0;
+        psr_vsc.sdp_header.HB1 = 0x7;
+        psr_vsc.sdp_header.HB2 = 0x3;
+        psr_vsc.sdp_header.HB3 = 0xb;
+        intel_psr_write_vsc(intel_dp, &psr_vsc);
+}
+
 static void hsw_psr_setup_vsc(struct intel_dp *intel_dp)
 {
         struct edp_vsc_psr psr_vsc;
@@ -165,6 +178,12 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
                 drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
                                    DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE);
 
+        /* Enable AUX frame sync at sink */
+        if (dev_priv->psr.aux_frame_sync)
+                drm_dp_dpcd_writeb(&intel_dp->aux,
+                                DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
+                                DP_AUX_FRAME_SYNC_ENABLE);
+
         aux_data_reg = (INTEL_INFO(dev)->gen >= 9) ?
                                 DPA_AUX_CH_DATA1 : EDP_PSR_AUX_DATA1(dev);
         aux_ctl_reg = (INTEL_INFO(dev)->gen >= 9) ?
@@ -183,8 +202,10 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
                 val |= DP_AUX_CH_CTL_TIME_OUT_1600us;
                 val &= ~DP_AUX_CH_CTL_MESSAGE_SIZE_MASK;
                 val |= (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
-                /* Use hardcoded data values for PSR */
+                /* Use hardcoded data values for PSR, frame sync and GTC */
                 val &= ~DP_AUX_CH_CTL_PSR_DATA_AUX_REG_SKL;
+                val &= ~DP_AUX_CH_CTL_FS_DATA_AUX_REG_SKL;
+                val &= ~DP_AUX_CH_CTL_GTC_DATA_AUX_REG_SKL;
                 I915_WRITE(aux_ctl_reg, val);
         } else {
                 I915_WRITE(aux_ctl_reg,
@@ -232,6 +253,7 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp)
         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;
+
         uint32_t max_sleep_time = 0x1f;
         /* Lately it was identified that depending on panel idle frame count
          * calculated at HW can be off by 1. So let's use what came
@@ -255,6 +277,10 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp)
                    max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
                    idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
                    EDP_PSR_ENABLE);
+
+        if (dev_priv->psr.psr2_support)
+                I915_WRITE(EDP_PSR2_CTL, EDP_PSR2_ENABLE |
+                                EDP_SU_TRACK_ENABLE | EDP_PSR2_TP2_TIME_100);
 }
 
 static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
@@ -332,6 +358,7 @@ void intel_psr_enable(struct intel_dp *intel_dp)
         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
         struct drm_device *dev = intel_dig_port->base.base.dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
+        struct intel_crtc *crtc = to_intel_crtc(intel_dig_port->base.base.crtc);
 
         if (!HAS_PSR(dev)) {
                 DRM_DEBUG_KMS("PSR not supported on this platform\n");
@@ -364,6 +391,15 @@ void intel_psr_enable(struct intel_dp *intel_dp)
         if (HAS_DDI(dev)) {
                 hsw_psr_setup_vsc(intel_dp);
 
+                if (dev_priv->psr.psr2_support) {
+                        /* PSR2 is restricted to work with panel resolutions upto 3200x2000 */
+                        if (crtc->config->pipe_src_w > 3200 ||
+                                crtc->config->pipe_src_h > 2000)
+                                dev_priv->psr.psr2_support = false;
+                        else
+                                skl_psr_setup_su_vsc(intel_dp);
+                }
+
                 /* Avoid continuous PSR exit by masking memup and hpd */
                 I915_WRITE(EDP_PSR_DEBUG_CTL(dev), EDP_PSR_DEBUG_MASK_MEMUP |
                            EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);