Re: [PATCH 5/6] drm/i915/display: Compute vrr_vsync params

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On 2/22/2024 5:42 PM, Mitul Golani wrote:
Compute vrr_vsync_start/end  which sets the position
for hardware to send the Vsync at a fixed position
relative to the end of the Vblank.

--v2:
- Update, VSYNC_START/END macros to VRR_VSYNC_START/END.(Ankit)
- Update bit fields of VRR_VSYNC_START/END.(Ankit)

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
---
  drivers/gpu/drm/i915/display/intel_display.c       |  1 +
  drivers/gpu/drm/i915/display/intel_display_types.h |  1 +
  drivers/gpu/drm/i915/display/intel_vrr.c           | 12 ++++++++++++
  drivers/gpu/drm/i915/i915_reg.h                    |  7 +++++++
  4 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 00ac65a14029..5994f7fcbb6a 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5321,6 +5321,7 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
  		PIPE_CONF_CHECK_I(vrr.flipline);
  		PIPE_CONF_CHECK_I(vrr.pipeline_full);
  		PIPE_CONF_CHECK_I(vrr.guardband);
+		PIPE_CONF_CHECK_BOOL(vrr.as_sdp_enable);

Need to add PIPE_CONF_CHECK_I(vrr.vsync_start/end).


  	}
#undef PIPE_CONF_CHECK_X
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 93b4b7dff1d0..7859e4baad4b 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1416,6 +1416,7 @@ struct intel_crtc_state {
  		u16 flipline, vmin, vmax, guardband;
  		u8 as_sdp_mode;
  		bool as_sdp_enable;
+		u32 vsync_end, vsync_start;
  	} vrr;
/* Stream Splitter for eDP MSO */
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 08e3ba69bd30..29ddf504d94b 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -150,6 +150,13 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
crtc_state->vrr.flipline = crtc_state->vrr.vmin + 1; + crtc_state->vrr.vsync_start =
+			(crtc_state->hw.adjusted_mode.crtc_vtotal -
+			VRR_VSYNC_START(crtc_state->hw.adjusted_mode.vsync_start));
+	crtc_state->vrr.vsync_end =
+			(crtc_state->hw.adjusted_mode.crtc_vtotal -
+			(VRR_VSYNC_END(crtc_state->hw.adjusted_mode.vsync_end) >> 16));

Need to add trans_vrr_start/end also in vrr_get_config.

Make sure to read/write these only when we intend to send adaptive_sync sdp.


Regards,

Ankit


+
  	/*
  	 * For XE_LPD+, we use guardband and pipeline override
  	 * is deprecated.
@@ -273,8 +280,13 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
  	u32 trans_vrr_ctl;
trans_vrr_ctl = intel_de_read(dev_priv, TRANS_VRR_CTL(cpu_transcoder));
+	bool as_sdp_enabled =
+			intel_de_read(dev_priv,
+				      HSW_TVIDEO_DIP_CTL(cpu_transcoder));
crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE;
+	crtc_state->vrr.as_sdp_enable =
+			as_sdp_enabled & VIDEO_DIP_ENABLE_ADAPTIVE_SYNC;
if (DISPLAY_VER(dev_priv) >= 13)
  		crtc_state->vrr.guardband =
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c02ea07af4c2..3e0853458ef4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2007,7 +2007,9 @@
  #define _TRANS_VRR_CTL_B		0x61420
  #define _TRANS_VRR_CTL_C		0x62420
  #define _TRANS_VRR_CTL_D		0x63420
+#define _TRANS_VRR_VSYNC_A		0x60078
  #define TRANS_VRR_CTL(trans)			_MMIO_TRANS2(trans, _TRANS_VRR_CTL_A)
+#define TRANS_VRR_VSYNC(trans)			_MMIO_TRANS2(trans, _TRANS_VRR_VSYNC_A)
  #define   VRR_CTL_VRR_ENABLE			REG_BIT(31)
  #define   VRR_CTL_IGN_MAX_SHIFT			REG_BIT(30)
  #define   VRR_CTL_FLIP_LINE_EN			REG_BIT(29)
@@ -2087,6 +2089,11 @@
  #define TRANS_VRR_STATUS2(trans)	_MMIO_TRANS2(trans, _TRANS_VRR_STATUS2_A)
  #define   VRR_STATUS2_VERT_LN_CNT_MASK	REG_GENMASK(19, 0)
+#define VRR_VSYNC_END_MASK REG_GENMASK(28, 16)
+#define   VRR_VSYNC_END(vsync_end)	REG_FIELD_PREP(VSYNC_END_MASK, (vsync_end))
+#define   VRR_VSYNC_START_MASK		REG_GENMASK(12, 0)
+#define   VRR_VSYNC_START(vsync_start)	REG_FIELD_PREP(VSYNC_START_MASK, (vsync_start))
+
  #define _TRANS_PUSH_A			0x60A70
  #define _TRANS_PUSH_B			0x61A70
  #define _TRANS_PUSH_C			0x62A70



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