Link Off Between Active Frames, is a new feature for eDP
that allows the panel to go to lower power state after
transmission of data. This is a feature on top of ALPM, AS SDP.
Add compute config during atomic-check phase.
v1: RFC version.
v2: Add separate flag for auxless-alpm. [Jani]
v3:
- intel_dp->lobf_supported replaced with crtc_state->has_lobf. [Jouni]
- Add DISPLAY_VER() check. [Jouni]
- Modify function name of get_aux_less_status. [Jani]
v4: Add enum alpm_mode to hold the aux-wake/less capability.
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_alpm.c | 58 +++++++++++++++++++
drivers/gpu/drm/i915/display/intel_alpm.h | 5 ++
.../drm/i915/display/intel_display_types.h | 11 ++++
drivers/gpu/drm/i915/display/intel_dp.c | 4 ++
4 files changed, 78 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c
index ee6c2a959f09..5979eab1f2e0 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.c
+++ b/drivers/gpu/drm/i915/display/intel_alpm.c
@@ -11,6 +11,23 @@
#include "intel_dp_aux.h"
#include "intel_psr_regs.h"
+enum alpm_mode intel_alpm_get_capability(struct intel_dp *intel_dp)
+{
+ u8 alpm_caps = 0;
+
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_RECEIVER_ALPM_CAP,
+ &alpm_caps) != 1)
+ return ALPM_INVALID;
+
+ if (alpm_caps & DP_ALPM_CAP)
+ return ALPM_AUX_WAKE;
+
+ if (alpm_caps & DP_ALPM_AUX_LESS_CAP)
+ return ALPM_AUX_LESS;
+
+ return ALPM_NOT_SUPPORTED;
+}
+
/*
* See Bspec: 71632 for the table
*
@@ -242,6 +259,47 @@ bool intel_alpm_compute_params(struct intel_dp *intel_dp,
return true;
}
+void intel_alpm_compute_lobf_config(struct intel_dp *intel_dp,
+ struct intel_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+ struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+ int waketime_in_lines, first_sdp_position;
+ int context_latency, guardband;
+
+ if (!intel_dp_is_edp(intel_dp))
+ return;
+
+ if (DISPLAY_VER(i915) < 20)
+ return;
+
+ if (!intel_dp_as_sdp_supported(intel_dp))
+ return;
+
+ if (crtc_state->has_psr)
+ return;
+
+ if (intel_dp->alpm_parameters.mode == ALPM_INVALID ||
+ intel_dp->alpm_parameters.mode == ALPM_NOT_SUPPORTED)
+ return;
+
+ if (!intel_alpm_compute_params(intel_dp, crtc_state))
+ return;
+
+ context_latency = adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay;
+ guardband = adjusted_mode->crtc_vtotal -
+ adjusted_mode->crtc_vdisplay - context_latency;
+ first_sdp_position = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_start;
+ if (intel_dp->alpm_parameters.mode == ALPM_AUX_LESS)
+ waketime_in_lines = intel_dp->alpm_parameters.io_wake_lines;
+ else
+ waketime_in_lines = intel_dp->alpm_parameters.fast_wake_lines;
+
+ crtc_state->has_lobf = (context_latency + guardband) >
+ (first_sdp_position + waketime_in_lines);
+}
+
static void lnl_alpm_configure(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h b/drivers/gpu/drm/i915/display/intel_alpm.h
index c45d078e5a6b..80c8a66b34af 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.h
+++ b/drivers/gpu/drm/i915/display/intel_alpm.h
@@ -10,9 +10,14 @@
struct intel_dp;
struct intel_crtc_state;
+struct drm_connector_state;
+enum alpm_mode intel_alpm_get_capability(struct intel_dp *intel_dp);
bool intel_alpm_compute_params(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state);
+void intel_alpm_compute_lobf_config(struct intel_dp *intel_dp,
+ struct intel_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state);
void intel_alpm_configure(struct intel_dp *intel_dp);
#endif
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index e81fd71ce57b..79e9e543020b 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1405,6 +1405,9 @@ struct intel_crtc_state {
/* for loading single buffered registers during vblank */
struct drm_vblank_work vblank_work;
+
+ /* LOBF flag */
+ bool has_lobf;
};
enum intel_pipe_crc_source {
@@ -1715,6 +1718,13 @@ struct intel_psr {
u8 entry_setup_frames;
};
+enum alpm_mode {
+ ALPM_INVALID,
+ ALPM_AUX_WAKE,
+ ALPM_AUX_LESS,
+ ALPM_NOT_SUPPORTED
+};
+
struct intel_dp {
i915_reg_t output_reg;
u32 DP;
@@ -1835,6 +1845,7 @@ struct intel_dp {
u8 fast_wake_lines;
/* LNL and beyond */
+ enum alpm_mode mode;
u8 check_entry_lines;
u8 silence_period_sym_clocks;
u8 lfps_half_cycle_num_of_syms;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 486361eb0070..df423a33f6fc 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -48,6 +48,7 @@
#include "i915_drv.h"
#include "i915_irq.h"
#include "i915_reg.h"
+#include "intel_alpm.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_backlight.h"
@@ -3000,6 +3001,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
intel_vrr_compute_config(pipe_config, conn_state);
intel_dp_compute_as_sdp(intel_dp, pipe_config);
intel_psr_compute_config(intel_dp, pipe_config, conn_state);
+ intel_alpm_compute_lobf_config(intel_dp, pipe_config, conn_state);
intel_dp_drrs_compute_config(connector, pipe_config, link_bpp_x16);
intel_dp_compute_vsc_sdp(intel_dp, pipe_config, conn_state);
intel_dp_compute_hdr_metadata_infoframe_sdp(intel_dp, pipe_config, conn_state);
@@ -6615,6 +6617,8 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
intel_pps_init_late(intel_dp);
+ intel_dp->alpm_parameters.mode = intel_alpm_get_capability(intel_dp);
+
return true;
out_vdd_off:
--
2.29.0
