From 64a5dd770d35cb2b14f929eb13fb7863d1bedb1c Mon Sep 17 00:00:00 2001 From: Animesh Manna Date: Wed, 23 Apr 2025 14:53:29 +0530 Subject: [PATCH] drm/i915/lobf: Update lobf if any change in dependent parameters MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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] v3: Update LOBF in post plane update instead of separate function. [Jouni] v4: - Add lobf disable print. [Jouni] - Simplify condition check for enabling/disabling lobf. [Jouni] v5: Disable LOBF in pre_plane_update(). [Jouni] v6: use lobf flag of old_crtc_state and write 0 into ALPM_CTL. [Jouni] Signed-off-by: Animesh Manna Reviewed-by: Jouni Högander Link: https://lore.kernel.org/r/20250423092334.2294483-7-animesh.manna@intel.com --- drivers/gpu/drm/i915/display/intel_alpm.c | 41 +++++++++++++++++++- drivers/gpu/drm/i915/display/intel_alpm.h | 2 + drivers/gpu/drm/i915/display/intel_display.c | 1 + 3 files changed, 43 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c index 01949b90c0c3..d38e729682ce 100644 --- a/drivers/gpu/drm/i915/display/intel_alpm.c +++ b/drivers/gpu/drm/i915/display/intel_alpm.c @@ -376,15 +376,54 @@ void intel_alpm_configure(struct intel_dp *intel_dp, intel_dp->alpm_parameters.transcoder = crtc_state->cpu_transcoder; } +void intel_alpm_pre_plane_update(struct intel_atomic_state *state, + struct intel_crtc *crtc) +{ + struct intel_display *display = to_intel_display(state); + const struct intel_crtc_state *crtc_state = + intel_atomic_get_new_crtc_state(state, crtc); + const struct intel_crtc_state *old_crtc_state = + intel_atomic_get_old_crtc_state(state, crtc); + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; + struct intel_encoder *encoder; + + if (DISPLAY_VER(display) < 20) + return; + + if (crtc_state->has_lobf || crtc_state->has_lobf == old_crtc_state->has_lobf) + return; + + for_each_intel_encoder_mask(display->drm, encoder, + crtc_state->uapi.encoder_mask) { + struct intel_dp *intel_dp; + + if (!intel_encoder_is_dp(encoder)) + continue; + + intel_dp = enc_to_intel_dp(encoder); + + if (!intel_dp_is_edp(intel_dp)) + continue; + + if (old_crtc_state->has_lobf) { + intel_de_write(display, ALPM_CTL(display, cpu_transcoder), 0); + drm_dbg_kms(display->drm, "Link off between frames (LOBF) disabled\n"); + } + } +} + void intel_alpm_post_plane_update(struct intel_atomic_state *state, struct intel_crtc *crtc) { struct intel_display *display = to_intel_display(state); const struct intel_crtc_state *crtc_state = intel_atomic_get_new_crtc_state(state, crtc); + const struct intel_crtc_state *old_crtc_state = + intel_atomic_get_old_crtc_state(state, crtc); struct intel_encoder *encoder; - if (!crtc_state->has_lobf && !crtc_state->has_psr) + if ((!crtc_state->has_lobf || + crtc_state->has_lobf == old_crtc_state->has_lobf) && !crtc_state->has_psr) return; for_each_intel_encoder_mask(display->drm, encoder, diff --git a/drivers/gpu/drm/i915/display/intel_alpm.h b/drivers/gpu/drm/i915/display/intel_alpm.h index 91f51fb24f98..77bae022a0ea 100644 --- a/drivers/gpu/drm/i915/display/intel_alpm.h +++ b/drivers/gpu/drm/i915/display/intel_alpm.h @@ -23,6 +23,8 @@ 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_pre_plane_update(struct intel_atomic_state *state, + struct intel_crtc *crtc); 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_display.c b/drivers/gpu/drm/i915/display/intel_display.c index b91a52e9909a..58845b74f17d 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -1176,6 +1176,7 @@ static void intel_pre_plane_update(struct intel_atomic_state *state, intel_atomic_get_new_crtc_state(state, crtc); enum pipe pipe = crtc->pipe; + intel_alpm_pre_plane_update(state, crtc); intel_psr_pre_plane_update(state, crtc); if (intel_crtc_vrr_disabling(state, crtc)) { -- 2.50.1