Adding relevant read out comparison code, in check_crtc_state, for the new
member of crtc_config, dp_m2_n2, which was introduced to store link_m_n
values for a DP downclock mode (if available). Suggested by Daniel.
v2: Changed patch title.
Daniel's review comments incorporated.
Added relevant state readout code for M2_N2. dp_m2_n2 comparison to be done
only when high RR is not in use (This is because alternate m_n register
programming will be done only when low RR is being used).
Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/intel_ddi.c | 1 +
drivers/gpu/drm/i915/intel_display.c | 72 +++++++++++++++++++++++++++++++++---
drivers/gpu/drm/i915/intel_dp.c | 2 +
drivers/gpu/drm/i915/intel_drv.h | 2 +
4 files changed, 72 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 0ad4e96..6784f0b 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1587,6 +1587,7 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
case TRANS_DDI_MODE_SELECT_DP_MST:
pipe_config->has_dp_encoder = true;
intel_dp_get_m_n(intel_crtc, pipe_config);
+ intel_dp_get_m2_n2(intel_crtc, pipe_config);
break;
default:
break;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 797f01c..2e625eb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6670,6 +6670,34 @@ void intel_dp_get_m_n(struct intel_crtc *crtc,
&pipe_config->dp_m_n);
}
+void intel_dp_get_m2_n2(struct intel_crtc *crtc,
+ struct intel_crtc_config *pipe_config)
+{
+ struct drm_device *dev = crtc->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ enum transcoder transcoder = pipe_config->cpu_transcoder;
+
+ if (INTEL_INFO(dev)->gen >= 8) {
+ intel_cpu_transcoder_get_m_n(crtc, transcoder,
+ &pipe_config->dp_m_n);
+ } else if (INTEL_INFO(dev)->gen > 6) {
+ pipe_config->dp_m2_n2.link_m =
+ I915_READ(PIPE_LINK_M2(transcoder));
+ pipe_config->dp_m2_n2.link_n =
+ I915_READ(PIPE_LINK_N2(transcoder));
+ pipe_config->dp_m2_n2.gmch_m =
+ I915_READ(PIPE_DATA_M2(transcoder))
+ & ~TU_SIZE_MASK;
+ pipe_config->dp_m2_n2.gmch_n =
+ I915_READ(PIPE_DATA_N2(transcoder));
+ pipe_config->dp_m2_n2.tu =
+ ((I915_READ(PIPE_DATA_M2(transcoder))
+ & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
+ }
+
+}
+
+
static void ironlake_get_fdi_m_n_config(struct intel_crtc *crtc,
struct intel_crtc_config *pipe_config)
{
@@ -9169,6 +9197,15 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
pipe_config->dp_m_n.gmch_m, pipe_config->dp_m_n.gmch_n,
pipe_config->dp_m_n.link_m, pipe_config->dp_m_n.link_n,
pipe_config->dp_m_n.tu);
+
+ DRM_DEBUG_KMS("dp: %i, gmch_m2: %u, gmch_n2: %u, link_m2: %u, link_n2: %u, tu2: %u\n",
+ pipe_config->has_dp_encoder,
+ pipe_config->dp_m2_n2.gmch_m,
+ pipe_config->dp_m2_n2.gmch_n,
+ pipe_config->dp_m2_n2.link_m,
+ pipe_config->dp_m2_n2.link_n,
+ pipe_config->dp_m2_n2.tu);
+
DRM_DEBUG_KMS("requested mode:\n");
drm_mode_debug_printmodeline(&pipe_config->requested_mode);
DRM_DEBUG_KMS("adjusted mode:\n");
@@ -9533,6 +9570,14 @@ intel_pipe_config_compare(struct drm_device *dev,
struct intel_crtc_config *current_config,
struct intel_crtc_config *pipe_config)
{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_connector *intel_connector = dev_priv->drrs.connector;
+ struct intel_encoder *encoder = (intel_connector != NULL) ?
+ intel_attached_encoder(&intel_connector->base) :
+ NULL;
+ struct intel_dp *intel_dp = (encoder != NULL) ?
+ enc_to_intel_dp(&encoder->base) : NULL;
+
#define PIPE_CONF_CHECK_X(name) \
if (current_config->name != pipe_config->name) { \
DRM_ERROR("mismatch in " #name " " \
@@ -9583,11 +9628,28 @@ intel_pipe_config_compare(struct drm_device *dev,
PIPE_CONF_CHECK_I(fdi_m_n.tu);
PIPE_CONF_CHECK_I(has_dp_encoder);
- PIPE_CONF_CHECK_I(dp_m_n.gmch_m);
- PIPE_CONF_CHECK_I(dp_m_n.gmch_n);
- PIPE_CONF_CHECK_I(dp_m_n.link_m);
- PIPE_CONF_CHECK_I(dp_m_n.link_n);
- PIPE_CONF_CHECK_I(dp_m_n.tu);
+
+
+ /* DP M1_N1 registers are used when DRRS is disabled or when high RR
+ * is used. Else, DP M2_N2 registers are used. The following check
+ * has been added to make sure a mismatch (if any) is displayed only
+ * for a real difference and not because of DRRS state.
+ */
+ if ((dev_priv->vbt.drrs_type == DRRS_NOT_SUPPORTED) ||
+ (dev_priv->vbt.drrs_type != DRRS_NOT_SUPPORTED && intel_dp &&
+ intel_dp->drrs_state.refresh_rate_type == DRRS_HIGH_RR)) {
+ PIPE_CONF_CHECK_I(dp_m_n.gmch_m);
+ PIPE_CONF_CHECK_I(dp_m_n.gmch_n);
+ PIPE_CONF_CHECK_I(dp_m_n.link_m);
+ PIPE_CONF_CHECK_I(dp_m_n.link_n);
+ PIPE_CONF_CHECK_I(dp_m_n.tu);
+ } else {
+ PIPE_CONF_CHECK_I(dp_m2_n2.gmch_m);
+ PIPE_CONF_CHECK_I(dp_m2_n2.gmch_n);
+ PIPE_CONF_CHECK_I(dp_m2_n2.link_m);
+ PIPE_CONF_CHECK_I(dp_m2_n2.link_n);
+ PIPE_CONF_CHECK_I(dp_m2_n2.tu);
+ }
PIPE_CONF_CHECK_I(adjusted_mode.crtc_hdisplay);
PIPE_CONF_CHECK_I(adjusted_mode.crtc_htotal);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 34ed143..9aa4dcd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1511,6 +1511,8 @@ static void intel_dp_get_config(struct intel_encoder *encoder,
intel_dp_get_m_n(crtc, pipe_config);
+ intel_dp_get_m2_n2(crtc, pipe_config);
+
if (port == PORT_A) {
if ((I915_READ(DP_A) & DP_PLL_FREQ_MASK) == DP_PLL_FREQ_160MHZ)
pipe_config->port_clock = 162000;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d8b540b..1013f70 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -763,6 +763,8 @@ void hsw_enable_pc8(struct drm_i915_private *dev_priv);
void hsw_disable_pc8(struct drm_i915_private *dev_priv);
void intel_dp_get_m_n(struct intel_crtc *crtc,
struct intel_crtc_config *pipe_config);
+void intel_dp_get_m2_n2(struct intel_crtc *crtc,
+ struct intel_crtc_config *pipe_config);
int intel_dotclock_calculate(int link_freq, const struct intel_link_m_n *m_n);
void
ironlake_check_encoder_dotclock(const struct intel_crtc_config *pipe_config,
--
1.9.2
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