[PATCH 1/2] drm/i915: Enable/disable shared dplls just the once for joined pipes

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Currently we loop over all joined pipes and enable/disable the
shared dplls for each. We don't really have to do that since
all joined pipes will be using the same dpll. So let's just do
the enable/disable once for the whole set of joined pipes.
We can still keep tracking the dpll active set as pipes as long
as we remember to flip the bits for all the joined pipes on one go.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c  | 16 +++-------------
 drivers/gpu/drm/i915/display/intel_dpll_mgr.c |  4 ++--
 2 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 3afb85fe8536..0e0e5285ad97 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -1658,17 +1658,12 @@ static void hsw_crtc_enable(struct intel_atomic_state *state,
 	for_each_pipe_crtc_modeset_enable(display, pipe_crtc, new_crtc_state, i)
 		intel_dmc_enable_pipe(display, pipe_crtc->pipe);
 
 	intel_encoders_pre_pll_enable(state, crtc);
 
-	for_each_pipe_crtc_modeset_enable(display, pipe_crtc, new_crtc_state, i) {
-		const struct intel_crtc_state *pipe_crtc_state =
-			intel_atomic_get_new_crtc_state(state, pipe_crtc);
-
-		if (pipe_crtc_state->shared_dpll)
-			intel_enable_shared_dpll(pipe_crtc_state);
-	}
+	if (new_crtc_state->shared_dpll)
+		intel_enable_shared_dpll(new_crtc_state);
 
 	intel_encoders_pre_enable(state, crtc);
 
 	for_each_pipe_crtc_modeset_enable(display, pipe_crtc, new_crtc_state, i) {
 		const struct intel_crtc_state *pipe_crtc_state =
@@ -1795,16 +1790,11 @@ static void hsw_crtc_disable(struct intel_atomic_state *state,
 	 * Need care with mst->ddi interactions.
 	 */
 	intel_encoders_disable(state, crtc);
 	intel_encoders_post_disable(state, crtc);
 
-	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
-		const struct intel_crtc_state *old_pipe_crtc_state =
-			intel_atomic_get_old_crtc_state(state, pipe_crtc);
-
-		intel_disable_shared_dpll(old_pipe_crtc_state);
-	}
+	intel_disable_shared_dpll(old_crtc_state);
 
 	intel_encoders_post_pll_disable(state, crtc);
 
 	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i)
 		intel_dmc_disable_pipe(display, pipe_crtc->pipe);
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index c825a507b905..c7b73cd4bc67 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -255,11 +255,11 @@ static void _intel_disable_shared_dpll(struct intel_display *display,
 void intel_enable_shared_dpll(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct intel_shared_dpll *pll = crtc_state->shared_dpll;
-	unsigned int pipe_mask = BIT(crtc->pipe);
+	unsigned int pipe_mask = intel_crtc_joined_pipe_mask(crtc_state);
 	unsigned int old_mask;
 
 	if (drm_WARN_ON(display->drm, !pll))
 		return;
 
@@ -301,11 +301,11 @@ void intel_enable_shared_dpll(const struct intel_crtc_state *crtc_state)
 void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct intel_shared_dpll *pll = crtc_state->shared_dpll;
-	unsigned int pipe_mask = BIT(crtc->pipe);
+	unsigned int pipe_mask = intel_crtc_joined_pipe_mask(crtc_state);
 
 	/* PCH only available on ILK+ */
 	if (DISPLAY_VER(display) < 5)
 		return;
 
-- 
2.45.3