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

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

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@intel.com>
> ---
>   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