On Tue, Feb 25, 2025 at 11:39:05PM +0530, Chaitanya Kumar Borah wrote:
> >From PTL, LUT registers are made double buffered. With this change,
> we don't need to wait for vblank to program them. Start DSB1 for
> programming them without waiting for vblank.
>
> Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.bo...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 919e236a9650..9c3fdfcd6759 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -7352,6 +7352,7 @@ static void intel_atomic_dsb_finish(struct
> intel_atomic_state *state,
> {
> struct intel_crtc_state *new_crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> + struct intel_display *display = to_intel_display(state);
>
> if (!new_crtc_state->use_dsb && !new_crtc_state->dsb_color_vblank)
> return;
> @@ -7408,7 +7409,8 @@ static void intel_atomic_dsb_finish(struct
> intel_atomic_state *state,
>
> if (new_crtc_state->dsb_color_vblank)
> intel_dsb_chain(state, new_crtc_state->dsb_commit,
> - new_crtc_state->dsb_color_vblank, true);
> + new_crtc_state->dsb_color_vblank,
> + HAS_DOUBLE_BUFFERED_LUT(display) ? false :
> true);
Using chaining for this is a bit ugly. GOSUB would seem more
appropriate. Here's a quick 1h effort to implement the basics
for that (completely untested):
https://github.com/vsyrjala/linux.git dsb_gosub
>
> intel_dsb_finish(new_crtc_state->dsb_commit);
> }
> --
> 2.25.1
--
Ville Syrjälä
Intel
