[Intel-gfx] [PATCH 1/4] drm/i915: Remove locks around skl+ scaler programming

[Ville Syrjala]

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

All the skl+ scaler registers are suitably confined to their own
cachelines so we don't need the uncore.lock to globally serialize
access to these registers. We actually already dropped some of this
in commit 14ad15296d1f ("drm/i915: Make skl+ universal plane
registers unlocked") as the plane scaler enabling/reconfiguration
became lockless. So let's complete that and remove the rest of
the locks from the scaler programming as well.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/skl_scaler.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c
index c2e94118566b..ac67e9fbb713 100644
--- a/drivers/gpu/drm/i915/display/skl_scaler.c
+++ b/drivers/gpu/drm/i915/display/skl_scaler.c
@@ -412,7 +412,6 @@ void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
 	int x = dst->x1;
 	int y = dst->y1;
 	int hscale, vscale;
-	unsigned long irqflags;
 	int id;
 	u32 ps_ctrl;
 
@@ -434,8 +433,6 @@ void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
 	ps_ctrl = skl_scaler_get_filter_select(crtc_state->hw.scaling_filter, 0);
 	ps_ctrl |=  PS_SCALER_EN | scaler_state->scalers[id].mode;
 
-	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
-
 	skl_scaler_setup_filter(dev_priv, pipe, id, 0,
 				crtc_state->hw.scaling_filter);
 
@@ -449,8 +446,6 @@ void skl_pfit_enable(const struct intel_crtc_state *crtc_state)
 			  x << 16 | y);
 	intel_de_write_fw(dev_priv, SKL_PS_WIN_SZ(pipe, id),
 			  width << 16 | height);
-
-	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
 void
@@ -519,15 +514,10 @@ static void skl_detach_scaler(struct intel_crtc *crtc, int id)
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	unsigned long irqflags;
-
-	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
 	intel_de_write_fw(dev_priv, SKL_PS_CTRL(crtc->pipe, id), 0);
 	intel_de_write_fw(dev_priv, SKL_PS_WIN_POS(crtc->pipe, id), 0);
 	intel_de_write_fw(dev_priv, SKL_PS_WIN_SZ(crtc->pipe, id), 0);
-
-	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
 /*
-- 
2.34.1