From: Pradeep Bhat <pradeep.bhat@xxxxxxxxx>
This patch computes and stored 2nd M/N/TU for switching to different
refresh rate dynamically. PIPECONF_EDP_RR_MODE_SWITCH bit helps toggle
between alternate refresh rates programmed in 2nd M/N/TU registers.
v2: Daniel's review comments
Computing M2/N2 in compute_config and storing it in crtc_config
v3: Modified reference to edp_downclock and edp_downclock_avail based on the
changes made to move them from dev_private to intel_panel.
v4: Modified references to is_drrs_supported based on the changes made to
rename it to drrs_support.
Signed-off-by: Pradeep Bhat <pradeep.bhat@xxxxxxxxx>
Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_dp.c | 106 ++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 6 ++-
3 files changed, 112 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f1eece4..57d2b64 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3206,6 +3206,7 @@
#define PIPECONF_INTERLACED_DBL_ILK (4 << 21) /* ilk/snb only */
#define PIPECONF_PFIT_PF_INTERLACED_DBL_ILK (5 << 21) /* ilk/snb only */
#define PIPECONF_INTERLACE_MODE_MASK (7 << 21)
+#define PIPECONF_EDP_RR_MODE_SWITCH (1 << 20)
#define PIPECONF_CXSR_DOWNCLOCK (1<<16)
#define PIPECONF_COLOR_RANGE_SELECT (1 << 13)
#define PIPECONF_BPC_MASK (0x7 << 5)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 079b53f..d1e1d6e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -791,6 +791,21 @@ intel_dp_set_clock(struct intel_encoder *encoder,
}
}
+static void
+intel_dp_set_m2_n2(struct intel_crtc *crtc, struct intel_link_m_n *m_n)
+{
+ struct drm_device *dev = crtc->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ enum transcoder transcoder = crtc->config.cpu_transcoder;
+
+ I915_WRITE(PIPE_DATA_M2(transcoder),
+ TU_SIZE(m_n->tu) | m_n->gmch_m);
+ I915_WRITE(PIPE_DATA_N2(transcoder), m_n->gmch_n);
+ I915_WRITE(PIPE_LINK_M2(transcoder), m_n->link_m);
+ I915_WRITE(PIPE_LINK_N2(transcoder), m_n->link_n);
+ return;
+}
+
bool
intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_crtc_config *pipe_config)
@@ -894,6 +909,14 @@ found:
pipe_config->port_clock,
&pipe_config->dp_m_n);
+ if (intel_connector->panel.edp_downclock_avail &&
+ intel_dp->drrs_state.drrs_support == SEAMLESS_DRRS_SUPPORT) {
+ intel_link_compute_m_n(bpp, lane_count,
+ intel_connector->panel.edp_downclock,
+ pipe_config->port_clock,
+ &pipe_config->dp_m2_n2);
+ }
+
intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
return true;
@@ -3522,6 +3545,87 @@ intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
I915_READ(pp_div_reg));
}
+void
+intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate) {
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_mode_config *mode_config = &dev->mode_config;
+ struct intel_encoder *encoder;
+ struct intel_dp *intel_dp = NULL;
+ struct intel_crtc_config *config = NULL;
+ struct intel_crtc *intel_crtc = NULL;
+ struct intel_connector *intel_connector = NULL;
+ bool found_edp = false;
+ u32 reg, val;
+ int index = 0;
+
+ if (refresh_rate <= 0) {
+ DRM_INFO("Refresh rate should be positive non-zero.\n");
+ goto out;
+ }
+
+ list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
+ if (encoder->type == INTEL_OUTPUT_EDP) {
+ intel_dp = enc_to_intel_dp(&encoder->base);
+ intel_crtc = encoder->new_crtc;
+ if (!intel_crtc) {
+ DRM_INFO("DRRS: intel_crtc not initialized\n");
+ goto out;
+ }
+ config = &intel_crtc->config;
+ intel_connector = intel_dp->attached_connector;
+ found_edp = true;
+ break;
+ }
+ }
+
+ if (!found_edp) {
+ DRM_INFO("DRRS supported for eDP only.\n");
+ goto out;
+ }
+
+ if (intel_dp->drrs_state.drrs_support < SEAMLESS_DRRS_SUPPORT) {
+ DRM_INFO("Seamless DRRS not supported.\n");
+ goto out;
+ }
+
+ if (intel_connector->panel.fixed_mode->vrefresh == refresh_rate)
+ index = DRRS_HIGH_RR;
+ else
+ index = DRRS_LOW_RR;
+
+ if (index == intel_dp->drrs_state.drrs_refresh_rate_type) {
+ DRM_INFO("DRRS requested for previously set RR...ignoring\n");
+ goto out;
+ }
+
+ if (!intel_crtc->active) {
+ DRM_INFO("eDP encoder has been disabled. CRTC not Active\n");
+ goto out;
+ }
+
+ mutex_lock(&intel_dp->drrs_state.mutex);
+
+ /* Haswell and below */
+ if (INTEL_INFO(dev)->gen >= 5 && INTEL_INFO(dev)->gen < 8) {
+ reg = PIPECONF(intel_crtc->config.cpu_transcoder);
+ val = I915_READ(reg);
+ if (index > DRRS_HIGH_RR) {
+ val |= PIPECONF_EDP_RR_MODE_SWITCH;
+ intel_dp_set_m2_n2(intel_crtc, &config->dp_m2_n2);
+ } else
+ val &= ~PIPECONF_EDP_RR_MODE_SWITCH;
+ I915_WRITE(reg, val);
+ }
+
+ intel_dp->drrs_state.drrs_refresh_rate_type = index;
+ DRM_INFO("eDP Refresh Rate set to : %dHz\n", refresh_rate);
+
+ mutex_unlock(&intel_dp->drrs_state.mutex);
+
+out:
+ return;
+}
+
static void
intel_dp_drrs_initialize(struct intel_digital_port *intel_dig_port,
struct intel_connector *intel_connector,
@@ -3555,6 +3659,8 @@ intel_dp_drrs_initialize(struct intel_digital_port *intel_dig_port,
intel_connector->panel.edp_downclock =
intel_connector->panel.downclock_mode->clock;
+ mutex_init(&intel_dp->drrs_state.mutex);
+
intel_dp->drrs_state.drrs_support = dev_priv->vbt.drrs_mode;
intel_dp->drrs_state.drrs_refresh_rate_type = DRRS_HIGH_RR;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d208bf5..d1c60fa 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -291,6 +291,9 @@ struct intel_crtc_config {
int pipe_bpp;
struct intel_link_m_n dp_m_n;
+ /* m2_n2 for eDP downclock */
+ struct intel_link_m_n dp_m2_n2;
+
/*
* Frequence the dpll for the port should run at. Differs from the
* adjusted dotclock e.g. for DP or 12bpc hdmi mode. This is also
@@ -489,6 +492,7 @@ enum edp_drrs_refresh_rate_type {
struct drrs_info {
enum drrs_support_type drrs_support;
enum edp_drrs_refresh_rate_type drrs_refresh_rate_type;
+ struct mutex mutex;
};
struct intel_dp {
@@ -761,7 +765,7 @@ void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
void intel_edp_psr_enable(struct intel_dp *intel_dp);
void intel_edp_psr_disable(struct intel_dp *intel_dp);
void intel_edp_psr_update(struct drm_device *dev);
-
+extern void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate);
/* intel_dsi.c */
bool intel_dsi_init(struct drm_device *dev);
--
1.7.9.5
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