On Mon, 2025-03-03 at 14:05 +0530, Animesh Manna wrote:
> For every commit the dependent condition for LOBF is checked
> and accordingly update has_lobf flag which will be used
> to update the ALPM_CTL register during commit.
>
> v1: Initial version.
> v2: Avoid reading h/w register without has_lobf check. [Jani]
>
> Signed-off-by: Animesh Manna <animesh.ma...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_alpm.c | 18 ++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_alpm.h | 1 +
> drivers/gpu/drm/i915/display/intel_ddi.c | 1 +
> 3 files changed, 20 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> b/drivers/gpu/drm/i915/display/intel_alpm.c
> index c2862888466f..f4586c76a7b7 100644
> --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> @@ -312,6 +312,24 @@ void intel_alpm_lobf_compute_config(struct
> intel_dp *intel_dp,
> (first_sdp_position + waketime_in_lines);
> }
>
> +void intel_alpm_lobf_update(const struct intel_crtc_state
> *crtc_state)
> +{
> + struct intel_display *display =
> to_intel_display(crtc_state);
> + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> + u32 alpm_ctl;
> +
> + if (DISPLAY_VER(display) < 20)
> + return;
> +
> + if (!crtc_state->has_lobf) {
> + alpm_ctl = intel_de_read(display, ALPM_CTL(display,
> cpu_transcoder));
> + if (alpm_ctl & ALPM_CTL_LOBF_ENABLE) {
> + alpm_ctl &= ~ALPM_CTL_LOBF_ENABLE;
> + intel_de_write(display, ALPM_CTL(display,
> cpu_transcoder), alpm_ctl);
> + }
Why can't you do this in alpm_post_plane_update? Disable it there if
old_crtc_state->has_lobf && !new_crtc_state->has_lobf?
BR,
Jouni Högander
> + }
> +}
> +
> static void lnl_alpm_configure(struct intel_dp *intel_dp,
> const struct intel_crtc_state
> *crtc_state)
> {
> diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h
> b/drivers/gpu/drm/i915/display/intel_alpm.h
> index 91f51fb24f98..c6efd25c2062 100644
> --- a/drivers/gpu/drm/i915/display/intel_alpm.h
> +++ b/drivers/gpu/drm/i915/display/intel_alpm.h
> @@ -23,6 +23,7 @@ void intel_alpm_lobf_compute_config(struct intel_dp
> *intel_dp,
> struct drm_connector_state
> *conn_state);
> void intel_alpm_configure(struct intel_dp *intel_dp,
> const struct intel_crtc_state
> *crtc_state);
> +void intel_alpm_lobf_update(const struct intel_crtc_state
> *crtc_state);
> void intel_alpm_post_plane_update(struct intel_atomic_state *state,
> struct intel_crtc *crtc);
> void intel_alpm_lobf_debugfs_add(struct intel_connector *connector);
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 9b504dcfb446..b6186e1cf804 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3620,6 +3620,7 @@ static void intel_ddi_update_pipe_dp(struct
> intel_atomic_state *state,
> intel_ddi_set_dp_msa(crtc_state, conn_state);
>
> intel_dp_set_infoframes(encoder, true, crtc_state,
> conn_state);
> + intel_alpm_lobf_update(crtc_state);
>
> intel_backlight_update(state, encoder, crtc_state,
> conn_state);
> drm_connector_update_privacy_screen(conn_state);
