Handle the bypass logic for the M/N ratio limit for DP.
Calculate the M/N ratio, check if it can bypass the limit, and set the
appropriate flags for the workaround.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display.c | 1 -
drivers/gpu/drm/i915/display/intel_display.h | 4 +++
drivers/gpu/drm/i915/display/intel_dp.c | 31 ++++++++++++++++++--
drivers/gpu/drm/i915/display/intel_dp.h | 5 ++++
drivers/gpu/drm/i915/display/intel_dp_mst.c | 5 +++-
5 files changed, 42 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index d23f90096b0e..f55a85f04ce5 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3430,7 +3430,6 @@ void bmg_bypass_m_n_limit_read(struct intel_crtc *crtc,
m_n->bypass_m_n_ratio_limit = true;
}
-static
int bmg_can_bypass_m_n_limit(struct intel_display *display,
int m_n_ratio,
enum pipe pipe)
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index 483a8f6cd69b..caf7549a3352 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -589,4 +589,8 @@ bool assert_port_valid(struct drm_i915_private *i915, enum port port);
bool intel_scanout_needs_vtd_wa(struct drm_i915_private *i915);
+int bmg_can_bypass_m_n_limit(struct intel_display *display,
+ int m_n_ratio,
+ enum pipe pipe);
+
#endif
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index d0c819807bfc..c741b3409fa6 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2847,6 +2847,27 @@ static bool can_enable_drrs(struct intel_connector *connector,
intel_panel_drrs_type(connector) == DRRS_TYPE_SEAMLESS;
}
+bool
+intel_dp_bmg_bypass_m_n_limit(struct intel_display *display,
+ struct intel_link_m_n *m_n,
+ enum pipe pipe)
+{
+ int m_n_ratio, m_n_frac;
+
+ m_n_ratio = DIV_ROUND_UP(m_n->link_m, m_n->link_n);
+
+ if (!bmg_can_bypass_m_n_limit(display, m_n_ratio, pipe))
+ return false;
+
+ m_n_frac = m_n->link_m % m_n->link_n;
+
+ m_n->link_n_ext = m_n_ratio | (m_n_ratio + (m_n_frac > 0 ? 1 : 0)) << 4;
+
+ m_n->bypass_m_n_ratio_limit = true;
+
+ return true;
+}
+
static int
intel_dp_drrs_compute_config(struct intel_connector *connector,
struct intel_crtc_state *pipe_config,
@@ -2856,6 +2877,8 @@ intel_dp_drrs_compute_config(struct intel_connector *connector,
struct intel_display *display = to_intel_display(connector);
const struct drm_display_mode *downclock_mode =
intel_panel_downclock_mode(connector, &pipe_config->hw.adjusted_mode);
+ struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
+ enum pipe pipe = crtc->pipe;
int pixel_clock;
int ret;
@@ -2885,7 +2908,8 @@ intel_dp_drrs_compute_config(struct intel_connector *connector,
pipe_config->port_clock,
intel_dp_bw_fec_overhead(pipe_config->fec_enable),
&pipe_config->dp_m2_n2);
- if (ret)
+
+ if (ret && !intel_dp_bmg_bypass_m_n_limit(display, &pipe_config->dp_m2_n2, pipe))
return ret;
/* FIXME: abstract this better */
@@ -3021,6 +3045,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
const struct drm_display_mode *fixed_mode;
struct intel_connector *connector = intel_dp->attached_connector;
+ struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
+ enum pipe pipe = crtc->pipe;
int ret = 0, link_bpp_x16;
if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv) && encoder->port != PORT_A)
@@ -3103,7 +3129,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
pipe_config->port_clock,
intel_dp_bw_fec_overhead(pipe_config->fec_enable),
&pipe_config->dp_m_n);
- if (ret)
+
+ if (ret && !intel_dp_bmg_bypass_m_n_limit(display, &pipe_config->dp_m_n, pipe))
return ret;
/* FIXME: abstract this better */
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 1b9aaddd8c35..92acb6a9eb4b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -20,8 +20,10 @@ struct intel_atomic_state;
struct intel_connector;
struct intel_crtc_state;
struct intel_digital_port;
+struct intel_display;
struct intel_dp;
struct intel_encoder;
+struct intel_link_m_n;
struct link_config_limits {
int min_rate, max_rate;
@@ -203,5 +205,8 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_connector *connector);
bool intel_dp_has_gamut_metadata_dip(struct intel_encoder *encoder);
+bool intel_dp_bmg_bypass_m_n_limit(struct intel_display *display,
+ struct intel_link_m_n *m_n,
+ enum pipe pipe);
#endif /* __INTEL_DP_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 317eb04bd8c6..817895b427ba 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -131,6 +131,8 @@ static int intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
struct intel_display *display = to_intel_display(connector);
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ enum pipe pipe = crtc->pipe;
int ret;
/* TODO: Check WA 14013163432 to set data M/N for full BW utilization. */
@@ -138,7 +140,8 @@ static int intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
adjusted_mode->crtc_clock,
crtc_state->port_clock,
overhead, m_n);
- if (ret)
+
+ if (ret && !intel_dp_bmg_bypass_m_n_limit(display, m_n, pipe))
return ret;
m_n->tu = DIV_ROUND_UP_ULL(mul_u32_u32(m_n->data_m, 64), m_n->data_n);
--
2.45.2
