On Tue, 28 May 2024, Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> I want to use intel_crtc_scanline_offset() in
> intel_crtc_scanline_to_hw(). Relocate intel_crtc_scanline_offset()
> a bit to avoid a forward declaration.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_vblank.c | 76 ++++++++++-----------
> 1 file changed, 38 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vblank.c b/drivers/gpu/drm/i915/display/intel_vblank.c
> index b0e95a4c680d..eb80952b0cfd 100644
> --- a/drivers/gpu/drm/i915/display/intel_vblank.c
> +++ b/drivers/gpu/drm/i915/display/intel_vblank.c
> @@ -188,6 +188,44 @@ static u32 __intel_get_crtc_scanline_from_timestamp(struct intel_crtc *crtc)
> return scanline;
> }
>
> +static int intel_crtc_scanline_offset(const struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
> +
> + /*
> + * The scanline counter increments at the leading edge of hsync.
> + *
> + * On most platforms it starts counting from vtotal-1 on the
> + * first active line. That means the scanline counter value is
> + * always one less than what we would expect. Ie. just after
> + * start of vblank, which also occurs at start of hsync (on the
> + * last active line), the scanline counter will read vblank_start-1.
> + *
> + * On gen2 the scanline counter starts counting from 1 instead
> + * of vtotal-1, so we have to subtract one.
> + *
> + * On HSW+ the behaviour of the scanline counter depends on the output
> + * type. For DP ports it behaves like most other platforms, but on HDMI
> + * there's an extra 1 line difference. So we need to add two instead of
> + * one to the value.
> + *
> + * On VLV/CHV DSI the scanline counter would appear to increment
> + * approx. 1/3 of a scanline before start of vblank. Unfortunately
> + * that means we can't tell whether we're in vblank or not while
> + * we're on that particular line. We must still set scanline_offset
> + * to 1 so that the vblank timestamps come out correct when we query
> + * the scanline counter from within the vblank interrupt handler.
> + * However if queried just before the start of vblank we'll get an
> + * answer that's slightly in the future.
> + */
> + if (DISPLAY_VER(i915) == 2)
> + return -1;
> + else if (HAS_DDI(i915) && intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
> + return 2;
> + else
> + return 1;
> +}
> +
> /*
> * intel_de_read_fw(), only for fast reads of display block, no need for
> * forcewake etc.
> @@ -467,44 +505,6 @@ void intel_wait_for_pipe_scanline_moving(struct intel_crtc *crtc)
> wait_for_pipe_scanline_moving(crtc, true);
> }
>
> -static int intel_crtc_scanline_offset(const struct intel_crtc_state *crtc_state)
> -{
> - struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
> -
> - /*
> - * The scanline counter increments at the leading edge of hsync.
> - *
> - * On most platforms it starts counting from vtotal-1 on the
> - * first active line. That means the scanline counter value is
> - * always one less than what we would expect. Ie. just after
> - * start of vblank, which also occurs at start of hsync (on the
> - * last active line), the scanline counter will read vblank_start-1.
> - *
> - * On gen2 the scanline counter starts counting from 1 instead
> - * of vtotal-1, so we have to subtract one.
> - *
> - * On HSW+ the behaviour of the scanline counter depends on the output
> - * type. For DP ports it behaves like most other platforms, but on HDMI
> - * there's an extra 1 line difference. So we need to add two instead of
> - * one to the value.
> - *
> - * On VLV/CHV DSI the scanline counter would appear to increment
> - * approx. 1/3 of a scanline before start of vblank. Unfortunately
> - * that means we can't tell whether we're in vblank or not while
> - * we're on that particular line. We must still set scanline_offset
> - * to 1 so that the vblank timestamps come out correct when we query
> - * the scanline counter from within the vblank interrupt handler.
> - * However if queried just before the start of vblank we'll get an
> - * answer that's slightly in the future.
> - */
> - if (DISPLAY_VER(i915) == 2)
> - return -1;
> - else if (HAS_DDI(i915) && intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
> - return 2;
> - else
> - return 1;
> -}
> -
> void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state,
> bool vrr_enable)
> {
--
Jani Nikula, Intel
