drm/i915/glk: Add Quirk for GLK NUC HDMI port issues.

On GLK NUC platforms the HDMI retiming buffer needs additional disabled
time to correctly sync to a faster incoming signal.

When measured on a scope the highspeed lines of the HDMI clock turn off
 for ~400uS during a normal resolution change. The HDMI retimer on the
 GLK NUC appears to require at least a full frame of quiet time before a
new faster clock can be correctly sync'd. Wait 100ms due to msleep
inaccuracies while waiting for a completed frame. Add a quirk to the
driver for GLK boards that use ITE66317 HDMI retimers.

V2: Add more devices to the quirk list
V3: Delay increased to 100ms, check to confirm crtc type is HDMI.
V4: crtc type check extended to include _DDI and whitespace fixes
v5: Fix white spaces, remove the macro for delay. Revert the crtc type
    check introduced in v4.

Cc: Imre Deak <imre.deak@intel.com>
Cc: <stable@vger.kernel.org> # v4.14+
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105887
Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Tested-by: Daniel Scheller <d.scheller.oss@gmail.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180710200205.1478-1-radhakrishna.sripada@intel.com
(cherry picked from commit 90c3e2198777aaa355b6994a31a79c636c8d4306)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

4 files changed, 33 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 52f3b91d14fd..71e1aa54f774 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -652,6 +652,7 @@ enum intel_sbi_destination {
 #define QUIRK_BACKLIGHT_PRESENT (1<<3)
 #define QUIRK_PIN_SWIZZLED_PAGES (1<<5)
 #define QUIRK_INCREASE_T12_DELAY (1<<6)
+#define QUIRK_INCREASE_DDI_DISABLED_TIME (1<<7)
 
 struct intel_fbdev;
 struct intel_fbc_work;
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index f4a8598a2d39..fed26d6e4e27 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1782,15 +1782,24 @@ void intel_ddi_enable_transcoder_func(const struct intel_crtc_state *crtc_state)
         I915_WRITE(TRANS_DDI_FUNC_CTL(cpu_transcoder), temp);
 }
 
-void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,
-                                       enum transcoder cpu_transcoder)
+void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state)
 {
+        struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+        struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
         i915_reg_t reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
         uint32_t val = I915_READ(reg);
 
         val &= ~(TRANS_DDI_FUNC_ENABLE | TRANS_DDI_PORT_MASK | TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
         val |= TRANS_DDI_PORT_NONE;
         I915_WRITE(reg, val);
+
+        if (dev_priv->quirks & QUIRK_INCREASE_DDI_DISABLED_TIME &&
+            intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI)) {
+                DRM_DEBUG_KMS("Quirk Increase DDI disabled time\n");
+                /* Quirk time at 100ms for reliable operation */
+                msleep(100);
+        }
 }
 
 int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2cc6faa1daa8..dec0d60921bf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5809,7 +5809,7 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
                 intel_ddi_set_vc_payload_alloc(intel_crtc->config, false);
 
         if (!transcoder_is_dsi(cpu_transcoder))
-                intel_ddi_disable_transcoder_func(dev_priv, cpu_transcoder);
+                intel_ddi_disable_transcoder_func(old_crtc_state);
 
         if (INTEL_GEN(dev_priv) >= 9)
                 skylake_scaler_disable(intel_crtc);
@@ -14646,6 +14646,18 @@ static void quirk_increase_t12_delay(struct drm_device *dev)
         DRM_INFO("Applying T12 delay quirk\n");
 }
 
+/*
+ * GeminiLake NUC HDMI outputs require additional off time
+ * this allows the onboard retimer to correctly sync to signal
+ */
+static void quirk_increase_ddi_disabled_time(struct drm_device *dev)
+{
+        struct drm_i915_private *dev_priv = to_i915(dev);
+
+        dev_priv->quirks |= QUIRK_INCREASE_DDI_DISABLED_TIME;
+        DRM_INFO("Applying Increase DDI Disabled quirk\n");
+}
+
 struct intel_quirk {
         int device;
         int subsystem_vendor;
@@ -14732,6 +14744,13 @@ static struct intel_quirk intel_quirks[] = {
 
         /* Toshiba Satellite P50-C-18C */
         { 0x191B, 0x1179, 0xF840, quirk_increase_t12_delay },
+
+        /* GeminiLake NUC */
+        { 0x3185, 0x8086, 0x2072, quirk_increase_ddi_disabled_time },
+        { 0x3184, 0x8086, 0x2072, quirk_increase_ddi_disabled_time },
+        /* ASRock ITX*/
+        { 0x3185, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
+        { 0x3184, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
 };
 
 static void intel_init_quirks(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 0361130500a6..b8eefbffc77d 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1388,8 +1388,7 @@ void hsw_fdi_link_train(struct intel_crtc *crtc,
 void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port);
 bool intel_ddi_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe);
 void intel_ddi_enable_transcoder_func(const struct intel_crtc_state *crtc_state);
-void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,
-                                       enum transcoder cpu_transcoder);
+void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state);
 void intel_ddi_enable_pipe_clock(const struct intel_crtc_state *crtc_state);
 void intel_ddi_disable_pipe_clock(const  struct intel_crtc_state *crtc_state);
 struct intel_encoder *