From f470b218b0bb7c9bae8aa2b4859d9a6bf97d98d1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 2 Feb 2022 13:16:13 +0200 Subject: [PATCH] drm/i915: Move PIPE_CHICKEN RMW out from the vblank evade critical section MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We don't want any RMWs in the part of the commit that happens under vblank evasion. Eventually we want to use the DSB to handle that and it can't read registers at all. Also reads are just slowing us down needlessly. Let's move the whole PIPE_CHICKEN stuff out from the critical section since we don't have anything there that needs to be syncrhonized with other plane/pipe registers. If we ever need to add such things then we have to move it back, but without doing any reads. TODO: should look into eliminating the RMW anyway... Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20220202111616.1579-1-ville.syrjala@linux.intel.com Reviewed-by: Juha-Pekka Heikkila --- drivers/gpu/drm/i915/display/intel_display.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 5434eeebfaa24..ca10623cc6aea 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -7878,9 +7878,6 @@ static void intel_pipe_fastset(const struct intel_crtc_state *old_crtc_state, if (DISPLAY_VER(dev_priv) >= 9 || IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv)) hsw_set_linetime_wm(new_crtc_state); - - if (DISPLAY_VER(dev_priv) >= 11) - icl_set_pipe_chicken(new_crtc_state); } static void commit_pipe_pre_planes(struct intel_atomic_state *state, @@ -7955,6 +7952,7 @@ static void intel_enable_crtc(struct intel_atomic_state *state, static void intel_update_crtc(struct intel_atomic_state *state, struct intel_crtc *crtc) { + struct drm_i915_private *i915 = to_i915(state->base.dev); const struct intel_crtc_state *old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc); struct intel_crtc_state *new_crtc_state = @@ -7971,6 +7969,10 @@ static void intel_update_crtc(struct intel_atomic_state *state, if (new_crtc_state->update_pipe) intel_encoders_update_pipe(state, crtc); + + if (DISPLAY_VER(i915) >= 11 && + new_crtc_state->update_pipe) + icl_set_pipe_chicken(new_crtc_state); } intel_fbc_update(state, crtc); -- 2.30.2