On Thu, Jun 28, 2018 at 11:14:30AM -0700, clinton.a.taylor@xxxxxxxxx wrote:
From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
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.
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105887
Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_ddi.c | 16 ++++++++++++++--
drivers/gpu/drm/i915/intel_display.c | 21 ++++++++++++++++++++-
drivers/gpu/drm/i915/intel_drv.h | 3 +--
4 files changed, 36 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2b684f4..6c5a679 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -655,6 +655,7 @@ 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 0319825..89bb5ce 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1807,15 +1807,27 @@ 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)
+/* Quirk time at 100ms for reliable operation */
+#define DDI_DISABLED_QUIRK_TIME 100
+
+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;
+
Extra w/s.
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)) {
+ msleep(DDI_DISABLED_QUIRK_TIME);
+ DRM_DEBUG_KMS("Quirk Increase DDI disabled time\n");
+ }
I still think the macro is redundant, but I'd put here your comment
about the worst case mode and delay. The debug print should come before
the wait.
}
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 eaa0663..ff42268 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5837,7 +5837,7 @@ static void haswell_crtc_disable(struct intel_crtc_state *old_crtc_state,
intel_ddi_set_vc_payload_alloc(old_crtc_state, 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);
@@ -14852,6 +14852,17 @@ 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;
@@ -14938,6 +14949,14 @@ static int intel_dmi_reverse_brightness(const struct dmi_system_id *id)
/* 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 },
+
Extra w/s.
With the above fixed:
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
