drm/i915: Program MBUS with rmw during initialization

It wasn't terribly clear from the bspec's wording, but after discussion
with the hardware folks, it turns out that we need to preserve the
pre-existing contents of the MBUS ABOX control register when
initializing a few specific bits.

Bspec: 49213
Bspec: 50096
Fixes: 4cb4585e5a7f ("drm/i915/icl: initialize MBus during display init")
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200204011032.582737-1-matthew.d.roper@intel.com
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
(cherry picked from commit 837b63e6087838d0f1e612d448405419199d8033)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228004320.127142-1-matthew.d.roper@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 21561ac..ae532e4 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -4466,13 +4466,19 @@ static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
 
 static void icl_mbus_init(struct drm_i915_private *dev_priv)
 {
-       u32 val;
+       u32 mask, val;
 
-       val = MBUS_ABOX_BT_CREDIT_POOL1(16) |
-             MBUS_ABOX_BT_CREDIT_POOL2(16) |
-             MBUS_ABOX_B_CREDIT(1) |
-             MBUS_ABOX_BW_CREDIT(1);
+       mask = MBUS_ABOX_BT_CREDIT_POOL1_MASK |
+               MBUS_ABOX_BT_CREDIT_POOL2_MASK |
+               MBUS_ABOX_B_CREDIT_MASK |
+               MBUS_ABOX_BW_CREDIT_MASK;
 
+       val = I915_READ(MBUS_ABOX_CTL);
+       val &= ~mask;
+       val |= MBUS_ABOX_BT_CREDIT_POOL1(16) |
+               MBUS_ABOX_BT_CREDIT_POOL2(16) |
+               MBUS_ABOX_B_CREDIT(1) |
+               MBUS_ABOX_BW_CREDIT(1);
        I915_WRITE(MBUS_ABOX_CTL, val);
 }