Re: [PATCH v18 8/9] drm/i915/display: Compute vrr_vsync params

["Nautiyal, Ankit K" <ankit.k.nautiyal@intel.com>]

On 3/13/2024 9:26 AM, 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:
> - Updated VSYNC_START/END macros to VRR_VSYNC_START/END. (Ankit)
> - Updated bit fields of VRR_VSYNC_START/END. (Ankit)
>
> --v3:
> - Add PIPE_CONF_CHECK_I(vrr.vsync_start/end).
> - Read/write vrr_vsync params only when we intend to send
> adaptive_sync sdp.
>
> --v4:
> - Use VRR_SYNC_START/END macros correctly.
>
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
> ---
>   drivers/gpu/drm/i915/display/intel_display.c  |  2 ++
>   .../drm/i915/display/intel_display_types.h    |  1 +
>   drivers/gpu/drm/i915/display/intel_vrr.c      | 30 +++++++++++++++++--
>   drivers/gpu/drm/i915/i915_reg.h               |  7 +++++
>   4 files changed, 38 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 8f1d948408d3..fed4ed18d53b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -5377,6 +5377,8 @@ 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_I(vrr.vsync_start);
> +		PIPE_CONF_CHECK_I(vrr.vsync_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 8a286751dc39..c2e08f641989 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1430,6 +1430,7 @@ struct intel_crtc_state {
>   		bool enable, in_range;
>   		u8 pipeline_full;
>   		u16 flipline, vmin, vmax, guardband;
> +		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 eb5bd0743902..ed38fee196b8 100644
> --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> @@ -9,6 +9,7 @@
>   #include "intel_de.h"
>   #include "intel_display_types.h"
>   #include "intel_vrr.h"
> +#include "intel_dp.h"
>   
>   bool intel_vrr_is_capable(struct intel_connector *connector)
>   {
> @@ -113,6 +114,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
>   	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
>   	struct intel_connector *connector =
>   		to_intel_connector(conn_state->connector);
> +	struct intel_dp *intel_dp = intel_attached_dp(connector);
>   	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
>   	const struct drm_display_info *info = &connector->base.display_info;
>   	int vmin, vmax;
> @@ -165,6 +167,15 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
>   	if (crtc_state->uapi.vrr_enabled) {
>   		crtc_state->vrr.enable = true;
>   		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
> +
> +		if (intel_dp_as_sdp_supported(intel_dp)) {
> +			crtc_state->vrr.vsync_start =
> +				(crtc_state->hw.adjusted_mode.crtc_vtotal -
> +					crtc_state->hw.adjusted_mode.vsync_start);
> +			crtc_state->vrr.vsync_end =
> +				(crtc_state->hw.adjusted_mode.crtc_vtotal -
> +					crtc_state->hw.adjusted_mode.vsync_end);
> +		}
>   	}
>   }
>   
> @@ -204,6 +215,11 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
>   	intel_de_write(dev_priv, TRANS_VRR_VMAX(cpu_transcoder), crtc_state->vrr.vmax - 1);
>   	intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder), trans_vrr_ctl(crtc_state));
>   	intel_de_write(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder), crtc_state->vrr.flipline - 1);
> +
> +	if (crtc_state->vrr.vsync_end && crtc_state->vrr.vsync_start)
> +		intel_de_write(dev_priv, TRANS_VRR_VSYNC(cpu_transcoder),
> +			       VRR_VSYNC_END(crtc_state->hw.adjusted_mode.vsync_end) |
> +				   VRR_VSYNC_START(crtc_state->hw.adjusted_mode.vsync_start));

Typo here, need to use crtc_state->vrr.vsync_end, 
crtc_state->vrr.vsync_start.

That also explains the mismatch in bat-arls-2

Regards,

Ankit


>   }
>   
>   void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
> @@ -264,7 +280,7 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
>   {
>   	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
>   	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> -	u32 trans_vrr_ctl;
> +	u32 trans_vrr_ctl, trans_vrr_vsync;
>   
>   	trans_vrr_ctl = intel_de_read(dev_priv, TRANS_VRR_CTL(cpu_transcoder));
>   
> @@ -284,6 +300,16 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
>   		crtc_state->vrr.vmin = intel_de_read(dev_priv, TRANS_VRR_VMIN(cpu_transcoder)) + 1;
>   	}
>   
> -	if (crtc_state->vrr.enable)
> +	if (crtc_state->vrr.enable) {
>   		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
> +
> +		if (HAS_AS_SDP(dev_priv)) {
> +			trans_vrr_vsync =
> +				intel_de_read(dev_priv, TRANS_VRR_VSYNC(cpu_transcoder));
> +			crtc_state->vrr.vsync_start =
> +				REG_FIELD_GET(VRR_VSYNC_START_MASK, trans_vrr_vsync);
> +			crtc_state->vrr.vsync_end =
> +				REG_FIELD_GET(VRR_VSYNC_END_MASK, trans_vrr_vsync);
> +		}
> +	}
>   }
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 9bda3a24cd94..9512f4c58094 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2095,6 +2095,13 @@
>   #define   TRANS_PUSH_EN			REG_BIT(31)
>   #define   TRANS_PUSH_SEND		REG_BIT(30)
>   
> +#define _TRANS_VRR_VSYNC_A		0x60078
> +#define TRANS_VRR_VSYNC(trans)		_MMIO_TRANS2(trans, _TRANS_VRR_VSYNC_A)
> +#define VRR_VSYNC_END_MASK		REG_GENMASK(28, 16)
> +#define VRR_VSYNC_END(vsync_end)	REG_FIELD_PREP(VRR_VSYNC_END_MASK, (vsync_end))
> +#define VRR_VSYNC_START_MASK		REG_GENMASK(12, 0)
> +#define VRR_VSYNC_START(vsync_start)	REG_FIELD_PREP(VRR_VSYNC_START_MASK, (vsync_start))
> +
>   /* VGA port control */
>   #define ADPA			_MMIO(0x61100)
>   #define PCH_ADPA                _MMIO(0xe1100)