[Intel-gfx] [PATCH v3 09/15] drm/i915: Sprinkle a few missing locks around shared DDI clock registers

[Ville Syrjala]

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

The current code attempts to protect the RMWs into global
clock routing registers with a mutex, but forgets to do so
in a few places. Let's remedy that.

Note that at the moment we serialize all modesets onto single
wq, so this shouldn't actually matter. But maybe one day we
wish to attempt parallel modesets again...

Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 0cb20163fb1f..bd1eac282033 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -1927,8 +1927,12 @@ static void cnl_ddi_disable_clock(struct intel_encoder *encoder)
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	enum port port = encoder->port;
 
+	mutex_lock(&i915->dpll.lock);
+
 	intel_de_rmw(i915, DPCLKA_CFGCR0,
 		     0, DPCLKA_CFGCR0_DDI_CLK_OFF(port));
+
+	mutex_unlock(&i915->dpll.lock);
 }
 
 static void skl_ddi_enable_clock(struct intel_encoder *encoder,
@@ -1957,8 +1961,12 @@ static void skl_ddi_disable_clock(struct intel_encoder *encoder)
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	enum port port = encoder->port;
 
+	mutex_lock(&i915->dpll.lock);
+
 	intel_de_rmw(i915, DPLL_CTRL2,
 		     0, DPLL_CTRL2_DDI_CLK_OFF(port));
+
+	mutex_unlock(&i915->dpll.lock);
 }
 
 void hsw_ddi_enable_clock(struct intel_encoder *encoder,
-- 
2.26.2