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

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

On 2/16/2024 7:50 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_types.h |  1 +
>   drivers/gpu/drm/i915/display/intel_vrr.c           |  7 +++++++
>   drivers/gpu/drm/i915/i915_reg.h                    | 11 +++++++++++
>   3 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index a6991bc3f07b..015ed846b896 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1414,6 +1414,7 @@ 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 5d905f932cb4..2fa0004d00c7 100644
> --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> @@ -149,6 +149,13 @@ 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));
> +
>   	/*
>   	 * For XE_LPD+, we use guardband and pipeline override
>   	 * is deprecated.
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index c02ea07af4c2..f73e95b18819 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1955,6 +1955,10 @@
>   #define   VSYNC_END(vsync_end)		REG_FIELD_PREP(VSYNC_END_MASK, (vsync_end))
>   #define   VSYNC_START_MASK		REG_GENMASK(15, 0)
>   #define   VSYNC_START(vsync_start)	REG_FIELD_PREP(VSYNC_START_MASK, (vsync_start))
> +#define   VSYNC_END_MASK		REG_GENMASK(31, 16)
> +#define   VSYNC_END(vsync_end)		REG_FIELD_PREP(VSYNC_END_MASK, (vsync_end))
> +#define   VSYNC_START_MASK		REG_GENMASK(15, 0)
> +#define   VSYNC_START(vsync_start)	REG_FIELD_PREP(VSYNC_START_MASK, (vsync_start))

I think this is typo, we really dont need to touch these.


>   #define _TRANS_EXITLINE_A	0x60018
>   #define _PIPEASRC		0x6001c
>   #define   PIPESRC_WIDTH_MASK	REG_GENMASK(31, 16)
> @@ -2007,7 +2011,9 @@
>   #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 +2093,11 @@
>   #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))

Here too, we need to use the correct VRR_VSYNC_STAR/END_MASK


Regards,

Ankit

> +
>   #define _TRANS_PUSH_A			0x60A70
>   #define _TRANS_PUSH_B			0x61A70
>   #define _TRANS_PUSH_C			0x62A70